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GeV Superconducting Linac With Ray FEL and GeV Spallation

VIEWS: 6 PAGES: 42

									            8 GeV Superconducting Linac
   With X-Ray FEL and 8 GeV Spallation & Neutrino Source
                               SY-120
 Neutrino          NUMI        Fixed-

“Super-                        Target


 Beams”     Off-
            Axis             X-RAY FEL LAB
                     Anti-
                    Proton
   8 GeV

                                             8 GeV Linac
        Main                             ~ 700m Active Length
      Injector
      @2 MW                    Slow-Pulse
                               Spallation Source
                               & Neutrino Target
           Project Information
                 An 8 GeV
                                                                                               FNAL-TM-2169 (Part II)

                                                                                                                                            • 125 Page Design Study
             Superconducting
           Injector Linac Design
                   Study
1 INTRODUCTION................................................................................................................... 5
                                                                                                                                            • Cost Estimate Spread
2 MOTIVATION FOR THE 8 GeV LINAC........................................................................... 7
   2.1 Multi-Mission Linac ....................................................................................................... 7
   2.2 Main Injector Operations with the 8 GeV Linac ............................................................ 8
   2.3 Relevance to Future Accelerator Projects .................................................................... 10
   2.4 Superconducting RF Technology................................................................................. 11
                                                                                                                                              Sheet w/ BoE
3 DESIGN OVERVIEW.......................................................................................................... 14
   3.1 Front-End Warm Linac (0-87 MeV) Overview............................................................ 14
   3.2 Superconducting RF (SCRF) Linac (87 MeV – 8 GeV) Overview ............................ 15
   3.3 RF Power Systems - Overview..................................................................................... 16
   3.4 Civil Construction Overview........................................................................................ 16
   3.5 Site Selection ................................................................................................................ 19



                                                                                                                                            • Big Pile of Useful Papers
   3.6 One-Tunnel vs. Two-Tunnel Machine Layout. ............................................................ 20
   3.7 Underground Klystron Gallery..................................................................................... 21
   3.8 Tunnel Depth and Shielding ......................................................................................... 21
4 CHOICE OF PRIMARY PARAMETERS ........................................................................ 22
   4.1 Beam Energy ................................................................................................................ 22
   4.2 Beam Charge per Pulse ................................................................................................ 22


                                                                                                                                                 sorted by category
   4.3 Beam Current and Pulse Width .................................................................................... 22
   4.4 Linac Pulse Repetition Rate (Average Beam Power)................................................... 23
   4.5 Different Particle Types in the 8 GeV Linac ................................................................ 24
5 ACCELERATOR PHYSICS ............................................................................................... 25
   5.1 Baseline Lattice and Cavity Layout ............................................................................. 25
   5.2 Transverse Focusing ..................................................................................................... 26
   5.3 Longitudinal Focusing and Frequency Jumps. ............................................................. 27
   5.4 Linac Aperture .............................................................................................................. 27
   5.5 H- Stripping from Magnetic Fields and Energy Upgrades ........................................... 29
   5.6 Energy Stability and Cavity Resonance Control .......................................................... 30
   5.7 Multiple Cavities per Klystron ..................................................................................... 30
   5.8 Debuncher Cavity......................................................................................................... 31
6 RUNNING ELECTRONS AND PROTONS IN THE SAME LINAC ............................ 32                                                            http://tdserver1.fnal.gov/project/8GeVlinac
 8 GeV Superconducting Linac
TECHNICAL SUBSYSTEM DESIGNS EXIST AND WORK




SNS Cavites         FNAL/TTF         “TTF Style” Cryomodules
                    Modulators

                                   Civil
                                 Const.
              RF                 Based
              Distribution*
                                     on
                                  FMI
             COST ESTIMATE
            (detail available online)
                   Cryomodules

               Civil Construction

                  RF Distribution

Modulators & Pulse Transformers

            Project Management

                     Electronics

                       Klystrons

   Front End & DTL (without RF)

                     Cryogenics

 Transfer Line, Injection, & Dump

                                    0   10,000   20,000        30,000         40,000   50,000   60,000
                                                      Cost ($k) w/o Contingency




$ 284 M + 30% Tax = $ 369 M
       8 GeV Linac Baseline 2 MW
  402.5 MHz
                     Modulator                                Modulator               Warm Copper                                  8 GeV 2 MW
                                                                                                                                        41 Klystrons (3 t
 SNS Klystrons                                 (7 total)                              Drift Tube Linac                                  31 Modulators 20
  2.5 MW
                                                                                      402.5 MHz                                         7 Warm Linac L
                                                                                      0 - 87 MeV                                        48 Cryomodules
                                                                                                                                       384 Superconducti


805 MHz Modulator                              Modulator              Modulator         Modulator                Modulator       Superconducting "S
 SNS
Klystrons                                                                                                                        805 MHz
5 MW
               12 cavites/ Klystron                                                            8 cavites/ Klystron               0.087 - 1.2 GeV
   B=0.47 B=0.47     B=0.61           B=0.61    B=0.61     B=0.81   B=0.81   B=0.81   B=0.81   B=0.81 B=0.81            B=0.81
                                                                                                                                   10 Klystrons
                                                                                                                                   96 cavites in 12 Cryomo


   Modulator     Modulator            Modulator       Modulator     Modulator     Modulator    Modulator             Modulator   Modulator   Modulator   Modu




   "TESLA" LINAC                                                                1207 MHz Beta=1 288 cavites in 36 Cry
                                                                                                                                 24 Klystrons

   Modulator     Modulator            Modulator       Modulator     Modulator     Modulator    Modulator             Modulator   Modulator   Modulator   Modu
          RF - Klystrons
• 402.5 MHz / 2.5 MW (7 total)    SNS Actual
• 805 MHz / 5.0 MW (10 total)
• 1207.5 MHz / 10 MW (36 total)   TESLA Design
                                  Scaled by ~ 7%
                                  from 1.3GHz

• Also the possibility of
  standardizing on TESLA
  frequencies and eliminating
  805 MHz entirely
                                             Klyst ron Powe r pe r Cavit y and RF Coupler (Be am) Power
                                             Ep ea k = 45MV /m in a ll cavities, P hi _S yn ch = -25 to -16 d eg re es
                                                                   Bea m Curre n t = 25m A
                                 900
                                               I nsta ll ed                       10 MW / 12 Cavi ti es
                                 800       Kl ystron P ow e r
                                              p er Ca vity              P ow er af te r RF Di st rib ut ion Los s es
                                 700
R F C ou p le r Po w e r (kW )




                                                      5 MW / 8
                                                                               B eta = 1.00
                                 600
                                                                                                      Be a m Po w e r
                                 500                                                                (Cou pl er Po w er )
                                           5MW /12
                                                     B eta = 0.81                                      p e r Cavity
                                 400

                                              Beta
                                 300         =0.61

                                       Be ta
                                 200
                                       0.47


                                 100

                                   0
                                       1             51          101     151           201         251         301         351
                                                                            Cavity Nu m be r
RF Power Budget & Coupler Power
                                       Klystron Power per Cavity and RF Coupler (Beam) Power
                                       Epeak = 45MV/m in all cavities, Phi_Synch = -25 to -16 degrees
                                                          Beam Current = 25mA
                           900
                                                                           10 M W / 12 Cavities
                                        Installed
                           800       Klystron Power
                                       per Cavity                P ower af ter R F D istrib u tion L osses
                           700
   RF Coupler Power (kW)




                                                5 MW / 8
                                                                        Beta = 1.00
                           600
                                                                                              Beam Power
                           500                                                              (Coupler Power)
                                               Beta = 0.81
                                     5MW /12                                                   per Cavity
                           400

                                       Beta
                           300         =0.61

                           200   B et a
                                 0.47


                           100


                             0
                                 1             51          101    151          201          251     301       351
                                                                    Cavity Number
           RF Fan-out for 8 GeV Linac
                                                     A. Moretti, D. Wildman
KLYSTRON




     35 foot
     waveguide
     from gallery
     to tunnel




           DIRECTIONAL
            COUPLER

              1/8 Power S plit         1/7 Power S plit   1/6 Power S plit   1/5 Power S plit   1/4 Power S plit   1/3 Power S plit   1/2 Power S plit
                 (9.03 dB )               (8.45 dB )         (7.78 dB )         (6.99 dB )         (6.02 dB )         (4.77 dB )         (3.01 dB )



     CIRCULATOR/
      ISOLATOR




      E-H TUNER
                               Magic
                               Tee
                    Ferrite
                    Loaded
                    Stub




                              CAVITY
      BEAM
               RF Fanout at Each Cavity
                                 KLYSTRON
KLYSTRON
                                   - RF Power Source
                                   - Located in Gallery above tunnel
                                   - Each Klystron Feeds 8-16 Cavities
    35 f oot
    waveguide
    f rom gallery
    to tunnel




          DIRECTIONAL                   DIRECTIONAL COUPLER
           COUPLER                        - Picks of a fixed amount of RF power at each station
                                          - Passes remaining power downstream to other cavities

    CIRCULATOR/
     ISOLATOR                           CIRCULATOR / ISOLATOR
                                          - Passes RF power forward towards cavity
                                          - Diverts reflected power to water cooled load

     E-H TUNER                           E-H TUNER
                                Magic
                                Tee        - Provides Phase and Amplitude Control for Cavities
                     Ferrite
                    Loaded
                     Stub
                                           - Biased Ferrite Provides Electronic Control

                                         SUPERCONDUCTING RF CAVITY
                               CAVITY      - Couples RF Power to Beam
     BEAM
805 MHz RF Distribution in
RF DISTRIBUTION FOR
               Tunnel
ONE 805 MHz CRYOMODULE

(12 total )




              No Active Electronics in Tunnel
               WAVEGUIDE TUNER OPTION
              – only Ferrite & Bias Coils.
              RF Distribution Technical
                    Parameters
RF Distribution System                   402.5 MHz       805 MHz      1207 MHz
Peak Power from Klystron                   2.5 MW        5.0 MW       10.0 MW
Cavities per Klystron                         1            8 - 12         12
Number of Output Waveguides per Klystron      1              1            2
Waveguides per Microwave Chase                1              2            2
RF Distribution Efficiency (see below)       95%            87%          86%        incl. Ferrite Phase shifters
Power Avalable at Cavity RF Coupler       2.38 MW        0.54 MW      0.71 MW
Peak Power Required at Coupler            1.80 MW        0.45 MW      0.60 MW       worst-case cavity in each grp.
Excess RF Power Available after losses      132%           121%         119%        TESLA ~106%
Waveguide                                402.5 MHz       805 MHz      1207 MHz
Waveguide Type (in long chase & fanout)   WR2100          WR975        WR770        local components smaller
Rated Waveguide Power @freq.              600 MW         120 MW        85 MW
Max Power in Waveguide (at Klystron)      2.5 MW          5 MW          5 MW
Average Power in Waveguide (at Klystron)   33 kW          75 kW         75 kW
RF Distribution Losses                      402.5 MHz 805 MHz         1207 MHz
Average Waveguide Length                     100 ft      125 ft        130 ft       incl. avg. length of fanout
Nominal Attenuation dB/100ft @freq.         0.06 db/cft 0.20 db/cft   0.25 db/cft
Waveguide Attenuation Losses                 0.06 db     0.25 db       0.33 db      Dielectric Co. Catalog
Power Splitter Directivity Losses            0.05 db     0.05 db       0.05 db
Circulator Losses                            0.10 db     0.10 db       0.10 db      0.08 meas. at TTF
Ferrite Tuner Losses                           N/A       0.20 db       0.20 db      quote from AFT
Overall Losses (avg)                         0.21 db     0.60 db       0.68 db
                       percent power losses    5%          13%           14%
Modulators for Klystrons
           • Biggest single component
             in RF costs
           • Pfeffer, Wolff, & Co.
             (FNAL BD) have been
             making TESLA spec
             modulators for years
           • FNAL Bouncer design in
             service at TTF since 1994
         Modulator Circuit
•   IGBT / Capacitor Discharge circuit
•   Bouncer to maintain flat top
•   Redundant Switch with Ignitron Crowbar
•   Pulse Transformer 10kV to 130 kV (typ.)




                       H. Pfeffer, D. Wolff, & sons.
             8 GeV Klystron Gallery Floor
                        Plan
                         RF STATIONS IN KLYSTRON GALLERY (to scale)
        402.5 MHz (2 Stations, 4 Klystrons ea.)      805 MHz (5 Stations, 2 Klystrons ea.)                   1207.5 MHz (24 Stations, 1 Klystron ea.)

                                                                                C on trol Ele ctroni cs                                   C on trol Ele ctroni cs
20 ft                                             20 ft                                                   20 ft                             for 12 Ca vities
                                                                                  for 12 Ca vities
                       MODULATOR                          MODULATOR                                                  MODULATOR




                          75 f t                                       65 f t                                                    70 f t




          • Linear array of equipment - simpler than SNS
          • Much more room allocated for electronics than
            TESLA design
TESLA Tunnel & Klystrons
TESLA RF DISTRIBUTION SYSTEM
  “SNS March 2000” Design, 12 Cavities / Klystron
       Individual + Collective Cavity Control




• SNS pursued & dropped due to lack of R&D time
     SNS Final Baseline RF Design
1 Klystron Per Cavity, Individual Control




• Conceptually simpler but ~10x more Klystrons
       Fast Ferrite Phase
          Shifter R&D
• Provides fast, flexible drive to individual cavites
  of a proton linac, when one is using a
  TESLA-style RF fanout. (1 klystron feeds 12-36 cavities)
• Also needed if Linac alternates between e and P.
• This R&D was started by SNS but dropped due to lack
  of time. They went to one-klystron-per-cavity which
  cost them a lot of money (~$20M / GeV).
Making this technology work is key to the
 financial feasibility of the 8 GeV Linac.
ELECTRONICALLY ADJUSTABLE
        E-H TUNER
             MICROWAVE INPUT POWER
              from Klystron and Circulator                             Attractive
                             Reflected Power                           Price Quote
   E-H                       (absorbed by circulator)
                                                        ATTENUATED
                                                                       from AFT
  TUNER                                                  OUTPUT
                                                        TO CAVITY      (<< Klystron)
ELECTRONIC TUNING
WITH BIASED FERRITE
                                                                FERRITE LOADED
  Ferrite                                                       SHORTED STUBS
  Loaded                                                        CHANGE ELECTRICAL
  Stub
                                                                LENGTH DEPENDING
                      Magic Tee                                 ON DC MAGNETIC BIAS.
Bias Coil

  TWO COILS PROVIDE INDEPENDENT
  PHASE AND AMPLITUDE CONTROL OF CAVITIES
                                         Ferrite Phase Shifter
                                        High-Power Test Stand
                                           A. Moretti, D. Wildman



                                         • 805 MHz Klystron
                                         • 12 MW x 100usec
                                             (need: 0.5 MW x 1 msec)
             Dry Load
                             12 MW       First goal:
              YIG Ferrite    Klystron      See if existing YIG tuner
             Phase Shifter
                                           functions at 500kW. (yes!)
               Door-knob
               Transition                Ultimate Goal:
Hybrid
 Tee                                        0.2 dB loss for
                                            360 deg. phase shift
   Ferrite
    Bias                                    in 100~500usec.
   Supply
  Tuners and Cavity Resonance
            Control
• TESLA R&D has shown that piezoelectric tuners
  can correct for Lorentz detuning and cavity
  microphonics in a 1 ms pulsed SC linac.
• SNS Cavity assemblies used for cost basis include
  both Mechanical and Piezoelectric tuners
• RF phase and amplitude control provided for
  individual cavities via fast ferrite phase shifters.
• Simulation (& SNS experience) needed to
  determine bandwidth requirement of shifters.
   At What Energy and Klystron
    Fanout does Vector Sum
        Regulation Work?
• If TESLA-style Vector-Sum Regulation works:
  – No need for FAST phase shifters
  – No need for Ferrite Phase Shifters at all if we start
    with H-/protons only.

• Design Study assumes Vector Sum works in
 Beta=1.00 section.
  – Marcus Huening embarking on detailed simulation
                                     Energy Oscillations in 8 GeV Superconducting Linac

                         0.3%
Energy Offset (dEk/Ek)




                         0.0%




                         -0.3%
                                 0      1000   2000   3000   4000   5000   6000   7000   8000   9000
                                                      Beam Kinetic Energy (MeV)
       RF Phasing in Linac
     for Protons vs. Electrons
• Cavity cell length changes as proton accelerates
   – not all cavities can be same design
   – lose some gradient by running off design 
• Protons are non-relativistic
   – energy error  downstream phase error
• Protons run off-crest
   – only get ~85% of accelerating gradient at crest
   – more sensitive to phase errors
• Must change cavity phases to accelerate electrons
  and protons on alternate cycles
                                                                                             (Ele ctro n -P ro to n ) P h a se S h ift in 1207.5 M H z (B e ta = 1.00) S e ctio n
                                                                                               fo r S in g le K lystro n D rivin g M u ltip le C a vitie s in 8 G e V L in a c
                                                                          2 7 0 .0 0
   Ph ase Sh ift R u n n in g Electro n s vs. Pro to n s




                                                                          1 8 0 .0 0
                                                                                                                                            Total Phas e Shif t ( deg)
                                                                                                                                            Phas e Shif t Modulo 360 degr ees
                                                                           9 0 .0 0
                                                           (d eg rees)




                                                                             0 .0 0



                                                                          -9 0 .0 0



                                                                         -1 8 0 .0 0



                                                                         -2 7 0 .0 0
                                                                                       110               160               210                260                 310           360
                                                                                                                  SC RF C avit y Nu m b e r ( 1207.5 M Hz Se ct io n o n ly)


Figure 1 – “Slow” phase shift required in cavity drive when changing between electrons
and protons in the 8 GeV linac. A single 1207.5 MHz klystron drives a group of 12
cavities in the  = 1 section. The klystron phases are adjusted for zero phase error in the
middle of each group of cavities, but differences in the time-of-flight create phase errors
at the end of each group. These phase errors must be corrected by individual phase
tuners on each cavity. The response time required for this “slow” phase adjustment is the
time between pulses (0.1 second). No amplitude adjustment is required with vector sum
regulation.
Summary of Phase Shifter Specs
  805 MHz and 1207.5 MHz

LINAC SECTION            = 0.47,  = 0.61,  = 0.81    = 1.00
FREQUENCY               805 MHz                        1207.5 MHz
# OF TUNERS, CAVITIES   96                             288
TUNER FUNCTION          Fast Resonance Control         Electron - Proton Phase
                                                       Shift
TUNER TYPE              Fast Phase & Amplitude         Slow Wide-Range Phase
                                                       Shift
RESPONSE TIME           100 sec                       0.1 second
PHASE ADJUST RANGE      30                           180
ATTENUATION RANGE       0-10 dB                        none
           Phase and Amplitude Tuner
                    Specs
RF Phase and Amplitude Adjustment         402.5 MHz 805 MHz        1207 MHz
Phase / Amplitude Tuner Type                 LLRF        Ferrite     Ferrite
Phase / Amplitude Tuner Locations         1 / klystron 1 / cavity   1 / cavity
Number of Phase / Amplitude Tuners              -          96          300
Phase Tuner Adjustment Range (deg)              -       60 deg      360 deg      for running electrons and H-
Phase Tuner Settling Time                       -      100 usec      0.1 sec     needs simulation
Amplitude Tuner Attenuation Range               -        -10dB        -10dB      target
Amplitude Tuner Slew Rate                       -     ~0.1dB/usec 10dB/0.1sec    needs simulation
Phase Tuner Peak Power                          -      0.45 MW     0.60 MW
Phase Tuner Insertion Loss                      -        0.2 db       0.2 db     AFT quote
Phase Tuner VSWR Loss                           -       0.02 db      0.02 db     target
Phase Tuner Avg. RF Power Dissipation           -        263 W       351 W       target
Phase Tuner Coil Average Power Dissipation      -         40 W        40 W       target for 10Hz pulse rep rate
Static RF amplitude error                    +/-1%       +/-1%        +/-1%      TBD
Static RF phase error                      +/-1 deg.   +/-1 deg.    +/-1 deg.    TBD
Dynamic RF amplitude error                 +/-0.5%      +/-0.5%     +/-0.5%      TBD
Dynamic RF phase error                    +/-0.5 deg. +/-0.5 deg. +/-0.5 deg.    TBD
  Staging & Cost Reductions
• Preserve 2 MW beam power Main Injector
  – Need 1.5E14 ~25uC per linac pulse.
• Reduce stand-alone power of 8 GeV Linac
  from 2 MW 0.5 MW
                                               Same
  – Beam current: 26mA  8.7mA
                                               Charge
  – Beam Pulse Length: 1msec  3 msec          Per Pulse
  – Rep Rate: 10Hz  2.5 Hz
• Klystron Count: 41  ~12-17
  – Option to install the rest as later 2 MW upgrade
• Investigate SCRF front end instead of DTL.
       8 GeV Linac Baseline 2 MW
  402.5 MHz
                     Modulator                                Modulator               Warm Copper                                  8 GeV 2 MW
                                                                                                                                        41 Klystrons (3 t
 SNS Klystrons                                 (7 total)                              Drift Tube Linac                                  31 Modulators 20
  2.5 MW
                                                                                      402.5 MHz                                         7 Warm Linac L
                                                                                      0 - 87 MeV                                        48 Cryomodules
                                                                                                                                       384 Superconducti


805 MHz Modulator                              Modulator              Modulator         Modulator                Modulator       Superconducting "S
 SNS
Klystrons                                                                                                                        805 MHz
5 MW
               12 cavites/ Klystron                                                            8 cavites/ Klystron               0.087 - 1.2 GeV
   B=0.47 B=0.47     B=0.61           B=0.61    B=0.61     B=0.81   B=0.81   B=0.81   B=0.81   B=0.81 B=0.81            B=0.81
                                                                                                                                   10 Klystrons
                                                                                                                                   96 cavites in 12 Cryomo


   Modulator     Modulator            Modulator       Modulator     Modulator     Modulator    Modulator             Modulator   Modulator   Modulator   Modu




   "TESLA" LINAC                                                                1207 MHz Beta=1 288 cavites in 36 Cry
                                                                                                                                 24 Klystrons

   Modulator     Modulator            Modulator       Modulator     Modulator     Modulator    Modulator             Modulator   Modulator   Modulator   Modu
      0.5 MW with SNS Frequencies
   402.5 MHz
                    Modulator                               Modulator               Warm Copper                        8 GeV 0.5 MW
                                                                                                                           17 Klystrons (3 typ
  SNS Klystrons                             (7 total)                               Drift Tube Linac                       12 Modulators 20 M
   2.5 MW
                                                                                    402.5 MHz                              7 Warm Linac Loa
                                                                                    0 - 87 MeV                             48 Cryomodules
                                                                                                                          384 Superconducting


805 MHz                Modulator                                                      Modulator                       "SNS" Superconduc
 SNS
Klystrons                                                                                                               805 MHz
5 MW                              24 cavites/ Klystron                                                                  0.087 - 1.2 GeV
   B=0.47 B=0.47     B=0.61     B=0.61          B=0.61   B=0.81   B=0.81   B=0.81   B=0.81   B=0.81 B=0.81   B=0.81
                                                                                                                       4 Klystrons
                                                                                                                       96 cavites in 12 Cryomodu


 "TESLA"          Modulator                                       Modulator                             Modulator                        Modulat
  Klystrons
 1207.5 MHz
  10 MW
                         36 cavites/ Klystron




                                                                                                                      8 Klystrons
            "TESLA" LINAC                                                  1207 MHz Beta=1                            288 cavites in 36 Cryo
                  Modulator                                       Modulator                             Modulator                        Modulat
       0.5 MW with SCRF Front End
   402.5 MHz
                    Modulator
                                                                                              "Pulsed RIA"                       8 GeV 0.5 MW
  SNS Klystrons                                                                                                                      14 Klystrons (3 typ
   2.5 MW                       Multi-Cavity Fanout at 10-20kW/cavity
                                Phase & Amplitude Adjust via Fast Ferrite Tuners
                                                                                               SCRF Linac                            11 Modulators 20 M
                                                                                               402.5 MHz                             1 Warm Linac Loa
                                                                                                                                     54 Cryomodules
                                                                                               0 - 120 MeV                          ~550 Superconductin


805 MHz                Modulator                                                                Modulator                       "SNS" Superconduc
 SNS
Klystrons                                                                                                                         805 MHz
5 MW                              24 cavites/ Klystron                                                                            0.087 - 1.2 GeV
   B=0.47   B=0.47 B=0.61       B=0.61          B=0.61       B=0.81         B=0.81   B=0.81   B=0.81   B=0.81   B=0.81 B=0.81
                                                                                                                                 4 Klystrons
                                                                                                                                 96 cavites in 12 Cryomodu


 "TESLA"          Modulator                                                  Modulator                              Modulator                      Modulat
  Klystrons
 1207.5 MHz
  10 MW
                         36 cavites/ Klystron




                                                                                                                                8 Klystrons
            "TESLA" LINAC                                                            1207 MHz Beta=1                            288 cavites in 36 Cryo
                  Modulator                                                  Modulator                              Modulator                      Modulat
0.5 MW with TESLA Frequencies & SCRF F.E.
    325 MHz
                  Modulator
                                                                                            "Pulsed RIA"                       8 GeV 0.5 MW
    Klystrons                                                                                                                      12 Klystrons (2 t
    1.5 MW                    Multi-Cavity Fanout at 10-20kW/cavity
                              Phase & Amplitude Adjust via Fast Ferrite Tuners
                                                                                             SCRF Linac                            11 Modulators 20
                                                                                             325 MHz                               1 Warm Linac L
                                                                                                                                   54 Cryomodules
                                                                                             0 - 120 MeV                          ~550 Superconduc


      TESLA
      Klystrons
                     Modulator                                                                Modulator                       "Squeezed TESL
     1300 MHz
      10 MW
                                                                                                                              Superconducting
                                48 cavites/ Klystron                                                                          1300 MHz 0.087
 B=0.47   B=0.47 B=0.61       B=0.61          B=0.61       B=0.81         B=0.81   B=0.81   B=0.81   B=0.81   B=0.81 B=0.81
                                                                                                                               2 Klystrons
                                                                                                                               96 cavites in 12 Cryomo


 TESLA          Modulator                                                  Modulator                              Modulator                      Modu
 Klystrons
1300 MHz
 10 MW
                       36 cavites/ Klystron




                                                                                                                              8 Klystrons
          "TESLA" LINAC                                                            1300 MHz Beta=1                            288 cavites in 36 Cry
                Modulator                                                  Modulator                              Modulator                      Modu
    SCRF Front End Option
• Replace DTL with independent, low-power
  SCRF resonators
• RF system ~1/5 the size (total watts)
• 300 MHz - 400 MHz
• Independent power tubes,
  or Fan out power from one big tube to many
  resonators?
Petr Ostroumov
                Radial Combiner
SNS 402.5 MHz   (or Fanout)
Klystron

								
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