Muon R_amp;D Review

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					             Proton Source Reference Notes
                  for mu2e at Fermilab


Section 1: Compilation of parameters describing the existing Fermilab
accelerator complex and the proposed new Fermilab Proton Driver

Section 2: Candidate rebunching schemes being discussed




                                                                        1
                         SECTION 1
Compilation of parameters describing the existing Fermilab accelerator
      complex and the proposed new Fermilab Proton Driver



             1.1   Fermilab Accelerator Complex
             1.2   Booster
             1.3   Recycler
             1.4   Antiproton Accumulator
             1.5   Antiproton Debuncher
             1.6   Fermilab Proton driver




                                                                         2
1.1 Fermilab Accelerator Complex




             Proton Driver
               Linac (H-)




                                   3
1.2 Fermilab Booster




                       4
           1.3 Fermilab Recycler

Circumference     C=2πRave        3320m
Momentum          P               8.89 GeV/c
Rev. frequency,   f0              89.8 kHz
Period            T0              11 μs
Slip factor       η=1/γ2- 1/γt2   0.0085
Tunes             νx, νy          25.4,24.4




                                               5
1.4 Antiproton Accumulator




                             6
1.5 Antiproton Debuncher




                           7
1.6 Proposed Fermilab Proton Driver
             8 GeV H- Linac




                                      8
                       Proton Driver Parameter List
PRIMARY PARAMETERS                         8 GeV Initial 0.5 MW {Ultimate 2MW in Brackets}
Linac beam kinetic energy                              8 GeV
Linac Particle Types                                 H - ions       Baseline Mission
                                                     Protons        via foil stripping in transfer line
                                                    Electrons       Possible w/upgrade of Phase Shifters & Injector
Linac Stand-Alone Beam power                   0.5 {2.0} MW         8 GeV beam power available directly from linac
Linac Pulse repetition rate                    2.5 {10} Hz
Linac macropulse width                         3.0 {1.0} ms
Linac current (avg. in macropulse)             8.7 {26} mA
Linac current (peak in macropulse)             9.3 {28} mA
Linac Beam Chopping factor in macropulse             94 %           For adiabatic capture with 700ns abort gap.
Linac Particles per macropulse               1.56E+14
Linac Charge per macropulse                          26 uC
Linac Energy per macropulse                         208 kJ
Linac average beam current                  0.07 {0.26} mA
Linac beam macropulse duty factor           0.75 {1.0} %
Linac RF duty factor                        1.00 {1.3} %
Linac Active Length including Front End             614 m           Excludes possible expansion length
Linac Beam-floor distance                          0.69 m =27 in.   same as Fermilab Main Injector
Linac Depth Below Grade                                9 m          same as Fermilab Main Injector
Transfer Line Length to Ring                        972 m           for MI-10 Injection point
Transfer Line Total Bend                             40 deg         two 20-degree collimation arcs
Ring circumference                              3319.4 m            Fermilab Main Injector
Ring Beam Energy                                  8-120 GeV         MI cycle time varies with energy
Ring Beam Power on Target                              2 MW         ~ independent of MI Beam Energy
Ring Circulating Current                             2.3 A
Ring cycle time                                 0.2-1.5 sec         depends on MI beam energy & flat-top
Ring Protons per Pulse on Target             1.50E+14 protons
Ring Charge per pulse on target                      25 uC
Ring Energy per pulse on target               200-3000 kJ           at 8-120 GeV
Ring Proton pulse length on target                   10 us          1 turn, or longer with resonant extraction
Linac Wall Power                             5.5 {12.5} MW          approx 3 MW Standby + 1MW / Hz
                                                                                                                      9
                 Proton Driver Parameter List - 2
8 GeV Superconducting LINAC
Energy                         GeV                8
Particle Type                 H- Ions, Protons, or Electrons
Rep. Rate                       Hz               10
Active Length                    m              671
Beam Current                    mA               25
Pulse Length                  msec                1
Beam Intensity               P / pulse     1.5E+14 (can also be H-, P, or e-)
                              P/s          1.5E+15
Linac Beam Power             MW avg.              2
                             MW peak            200

MAIN INJECTOR WITH 8 GeV LINAC
MI Beam Energy                 GeV             120
MI Beam Power                  MW              2.0
MI Cycle Time                  sec             1.5    filling time = 1msec
MI Protons/cycle                           1.5E+14    5x design
MI Protons/hr                  P / hr      3.6E+17
H-minus Injection              turns            90
MI Beam Current                 mA            2250
                                                                                10
           SECTION 2

Candidate rebunching schemes being discussed



2.1 Definitions
2.2 Schemes




                                               11
             2.1 Proton Source Definition

                   Beam seen by primary proton target

                                          Bunch Train
Bunch Trains / sec: fTRAIN
Bunch Spacing: DTB
No. of bunches: NB



No. protons/bunch: nP                           Bunches
Bunch Length (±2.5s) : ±tB
Note: 99% of beam within ±tB


Protons/train                              Derived Numbers
Protons/year (107 secs)


                                                             12
                   2.2 Proton Source Scenario 1
Description: Fermilab Proton Driver at 2MW. Recycler used to capture
and bunch, with bunch by bunch extraction.

              Bunch Trains / sec: fTRAIN   5 (*)

              Bunch Spacing: DTB           1 ms

              No. of bunches: NB           100

              No. protons/bunch: nP        1  1012

              Bunch Length (±2.5s) : tB    ±12.5 ns

              Protons/train                1  1014

              Protons/year (107 secs)      5  1021

Notes: (*) For 0.5MW FPD, fTRAIN  1.8 and Protons/year  1.8  1021
“PRISM”-like extracted beam
                                                                       13
                    2.2 Proton Source Scenario 2
Description: Fermilab Booster at 0.1 MW (using 0.03MW). Accumulator
used to capture and bunch at h=1, with slow extraction. (0.1s bunch, 0.1s extract)

               Bunch Trains / sec: fTRAIN    5 (*)

               Bunch Spacing: DTB            1.53 s

               No. of bunches: NB            6.6×104

               No. protons/bunch: nP         7.5  107

               Bunch Length (2.5s) : tB      200 ns (s=80ns)

               Protons/train                 5  1012

               Protons/year (107 secs)       2.5  1020


     Note: MECO-like extracted beam
                                                                                     14
                  2.2 Proton Source Scenario 3
Description: Fermilab Booster at 0.1 MW (using 0.025MW). Accumulator
used to capture 4 Booster turns and bunch at h=1,
with slow extraction. (~0.5s inject and bunch, ~0.5s extract)


            Bunch Trains / sec: fTRAIN   1 (*)

            Bunch Spacing: DTB           1.6 s

            No. of bunches: NB           33×104

            No. protons/bunch: nP        6  107

            Bunch Length (2.5s) : tB     150 ns (s=60ns)

            Protons/train                2  1013

            Protons/year (107 secs)      2  1020

                            Note: MECO-like extracted beam
                                                                       15
                2.2 Proton Source Scenario 3 continued
Booster timeline (concurrent with Nova)
                                               1.47 sec (22 cycles)




                                                       Main Injector cycle




                               Recycler to
                               Main Injector

                                           empty
                                                                                     …
 prepulses     to Recycler    to Accumulator        prepulses       to Recycler
                                               bunch
                                                   extract
                                                                  Booster Rate = 15*17/22
                                                                               = 11.6 Hz
                                                                                            16

				
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posted:5/19/2013
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