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Intense Muon Sources for Future Accelerators

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					       An Intense Muon Source for
           Future Accelerators
                                        Norbert Holtkamp


Project Presentation, Sept. 30th 1999



    • Neutrino Sources and Muon Colliders
    • What is a Neutrino Source
    • Neutrino Source Study at Fermilab



    • Scope of the Study
    • Ongoing MUCOOL R & D
    • Budget and Man Power Request
  Intense Muon Sources for
     Future Accelerators

• Collaboration has a new name:
   – “Neutrino Factory and Muon Collider Collaboration”
• Increasingly strong interest from the
  “Users” to develop an intense neutrino
  source
   – MUTAC: suggested to investigate a complete scenario
   – Study going on:
        • CERN
        • Brookhaven
        • FERMI

• Long Term:  it makes sense
   –   needs less total muons per sec for first step
   –   Performance is proportional to S Nm not N2
   –   less acceleration
   –   no longitudinal emittance exchange
   –   “First step to develop and use an intense Muon Source”
• Based on the methods and ideas developed
  for the Muon Collider
   – strip off everything which is not necessary
          The Neutrino Source

• First experiment based on an intense muon
  source
   – small emittance not necessary because divergence is
     dominated by decay kinematics
   – recognized by S. Geer




              Parameters for the Muon Storage Ring
   Energy                             GeV            50
   decay ratio                        %             >40
   inv. Emittance                     m*rad        0.0032
    in straight                      m             160
                                         12
   Nm/pulse                           10              6
   typical decay angle of m       mrad           2.0
   Beam angle (                  mrad           0.2
   Lifetime c*                     m            3x105
        Neutrino Source Study @ FERMI

          • Application of a “Generic Neutrino Source”
            to specific site
          • Base the study on specific set of Parameters
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                                                            Generic Layout

                                                            collaboration
                                                            paper



                                                            “deviate wherever
                                                            necessary or useful”


                                                            Physics Study in parallel
                                                            H. Schellmann / S. Geer
                          The Task

• A design concept for a muon storage ring and associated support
  facilities that could, with reasonable assurance, meet performance
  goals required to support a compelling neutrino based research
  program.

• 2.Identification of the likely cost drivers within such a facility.

• 3.Identification of an R&D program that would be required to
  address key areas of technological uncertainty and cost/performance
  optimization within this design, and that would, upon successful
  completion, allow one to move with confidence into the conceptual
  design stage of such a facility.

• 4.Identification of any specific environmental, safety, and health
  issues that will require our attention.
    The Energy Choice, the
  Experiment and the Options

• Purity of the beam: m+/m- -> e+/-ne/nm
• Kinematics from decay well known
• Polarization -> oscillation of ne component
         Choice has been made !

             Parameters for the Neutrino Source
  - Energy of the ring                            GeV     50
  - Number of neutrinos /                               2x1020/y
    straight
  - no polarization
  - capability to switch
    between m m

  - FERMI to SLAC / LBNL


• Basic Calculation
   – 1/3 of the muons decay in the straight section
   – 10 protons for 1 m into the storage ring
   – how long is the year: 2x107 sec (versus 1x107)
        • 2x1013 proton on target per pulse @ 16 GeV and 15 Hz
           (Weirren talks about this in detail)

        • 2x1012 m per pulse to be accelerated and injected into the
          ring

        • longer bunch in the proton driver and on target (1 nsec  3)

        • ring tilt angle is 13deg ( 22 %) instead of 35 deg (57 %)

        • maximizing the straight section with respect to
          circumference
             Is 22 % steep ?


                            •17 % into a quarry

                            •there is water !

                            •incremental cost small
                             compared making more n

                            •extend the ring up to the
                             surface




Further down the ramp   Use vehicles
 What changes compared to MC

• The Proton driver
   – one bunch (if induction linac
   – longer bunch (-> no polarization)
• The target
   – could be: Ptarget is still of the order of 1, solid graphite)




                                               30 - 60 MHz rf
                                               ~ 5 MV/m

   •   16 GeV protons at 2.5x1013
   •   1 bunches per pulse on target
   •   solid graphite type target (NuMI)
   •   0.6 p+ per proton
   •   pz ~ pt 200 MeV/c with sE ~ 100 %
                                                            After ~ 100 m Drift
Title:




           • Develop the correlation
                                                                                                                   Title:
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                                                                                                                   PR sim.dv i
Creator:
                                                                                                                   Creator:
dv ipsk 5.58f Copy right 1986, 1994 Radical Ey e Software
                                                                                                                   dv ipsk 5.58f Copy right 1986, 1994 Radical Ey e Software
Prev iew:
                                                                                                                   Prev iew:
This EPS picture was not sav ed
                                                                                                                   This EPS picture was not sav ed
with a prev iew inc luded in it.
                                                                                                                   with a prev iew inc luded in it.
Comment:
                                                                                                                   Comment:
This EPS picture will print to a
                                                                                                                   This EPS picture will print to a
PostSc ript printer, but not to
                                                                                                                   PostSc ript printer, but not to
other ty pes of printers.
                                                                                                                   other ty pes of printers.




                                                             Title:
                                                             PR sim.dv i
                                                             Creator:
                                                             dv ipsk 5.58f Copy right 1986, 1994 Radical Ey e Software
                                                             Prev iew:
                                                             This EPS picture was not sav ed
                                                             with a prev iew inc luded in it.
                                                             Comment:
                                                             This EPS picture will print to a
                                                             PostSc ript printer, but not to
                                                             other ty pes of printers.




  • Here comes the induction Linac
                     – 100 - 150 meter, 1 MV/m
                     – talk tomorrow by Simon Yu
                     = 0.0015 x 10-3 p m rad
Cooling Principle
                Goal & Schedule

• 6 Month study:  “10 pages of paper per
  subsystem+ 1 schedule + 1 cost”
   – Internal Review Mid January to align the different
     contributions
   – Documents in by mid February
   – Report out by March 1st
• Develop Alternatives for most risky parts
   – induction linac

   – cooling channel design and performance

   – acceleration: (  largest cost driver)
       • Jefferson Lab  Cornell  Fermilab
           The Neutrino Source

• Approach:
  – go more conventional where ever possible
      • target (solid), longer bunch in proton driver, remove
        (~30MHz) rf -> use induction linac,
      • get outside expertise where necessary and/or useful (target,
        acceleration, induction linacs, sc solenoids)

           – Oak Ridge      the target
           – Jefferson Lab / Cornell  sc rf and re-circulating
             linacs
           – Livermore  induction linacs (talk tomorrow)
           – IHEP Protvino  sc solenoid channels

      • general engineering (large scale rf systems, sc magnets, sc
        solenoid channels, ps, vacuum, beam lines, tunnel, water)
         come out of BD / TD (whatever division I can get)



      • specific design and engineering (cooling channel, target
        collection, beam manipulation, beam tracking and
        simulation)  Muon Collider group
       MUCOOL Hardware R&D



• Lab G and the high gradient cavity

• 10 Picosec Time of Flight Monitor

• Develop a 200 MHz cavity suitable for
  operation in the cooling channel
             Lab G Set-Up                 (going on)




• High Power 805 MHz RF
  – “Behavior of high gradient rf in strong magnetic field”

  – Time scale to finish ~ next FY




    RF Cave
              Open Cell Cavity                 (going on)




 • Iris aperture follows beam envelope
     – Gradient uniform over iris


                 Full length structure




• Parameters
   – 1 m long, ~30 MV/m on axis, 30 MW peak
• Specific Focus
   – high surface fields (~ 90 MV/m)
   – clean surfaces and structures  A0 infrastructure
• Test bed for other cavities and rf equippment
   Ultra-High-Speed TOF for mCool
                                                           (going on)




   • Probe transverse and longitudinal phase
     space, mCool requires arrival-time
     tagging of muons to 10 ps.
       – This is 3-5 X better than has been done for small
         systems
       – Plan is to use commercially available components and
         try to extend their performance range
   • Technical concept
       – Direct image MgF2 Cerenkov disk using CsI PC
       – Electron multiplier - micro-channel plate (MCP)
       – 50 W High frequency anode/connectors/cabling
• Basic Structure
   – UHV enclosure
   – Cerenkov radiator
       • 2-5 mm MgF2
   – CsI Photocathode
   – MCP stack
   – 50 Ohm anode
200 MHz Cavity + Power Source

• Engineering Layout required for the study
• Want to build and test it, once study is done

                               1/8th of the full
                               accelerating cell



                           ~ 0.65 m



Enhance the E Field
on Axis by using a grid

Goal: 15 MV/m
nc cavities


                ~ 0.65 m
                                 Man Power

Neutrino source study

NUMI                               0.5                    target
ES&H                               0.5
FESS                               1.0
Tech. Div.                         1.0
E/E                                1.0
Cryo                               1.0
Mechanical support                 1.0
RF                                 1.0                    rf
General Facilities                 0.5
RF/Proton source                   1.0        ?           Diagnostics
Beam Physics                       2.0
total                            10.5             10.5

Finish work in Lab G
Proton source                      1.5
Mechanical support                 1.0
E/E                                0.5
controls                           1.0
Cryo                               1.0
total                             5.0               5.0

New R&D for Neutrino Source (low Frequ. Rf)
Proton source                      0.5
Mechanical support                 0.5
total                             1.0               1.0

Proton Driver
Proton source                      1.2
Beam Physics                       2.9
Muon Collider / MI                 0.9
Tevatron RF                        1.0
Mechanical support                 0.3
E/E                                1.0
consultants                        0.7
total                             8.0               8.0

to Neutrino Source for 6 month    4.1

total for MC/Neutrin Source + Proton driver       24.5
                              Budget Request

                                   Only additional request are written down here
Collaboration money to Fermilab:

(" Muon collider")
Labg G                                             $       100.00
805 MHz in Lab G                                   $       150.00
200 MHz cavity                                     $       400.00
test stand for 200 MHz                             $       400.00

Instrumentation                                    $        50.00
LH_2 cell prototyping                              $       100.00
solenoid studies                                   $        50.00
conductor for sc solenoids                         $          -
beamline preparation                               $       100.00
consultants                                        $        50.00
money left from FY 99                              $       250.00                 <-----

total collaboration money                                                          $ 1,650.00 (fits the expected 1.4)
                                                                                                  (there will be 250 k$ left

Fermi money for proton driver and neutrino source study
(this is: paying people for paper work in other institutes and only a guess)

for the study:
solenoids for the decay channel                    $        50.00                 (Protvino)
accelerator studies                                $        50.00                 (CEBAF)
induct. Linac                                      $       100.00                 (LLNL, Dubna)
target                                             $        25.00                 (Oak Ridge)
                                                                    $    225.00                   (guess)
for proton driver
7.5 MHz cavity                                     $        85.00
beamloading compensation                           $        37.00
beam pipe prototype                                $        85.00
inductive insert                                   $        10.00
                                                                    $    217.00
                      Budget Request


for misc
consultants           $ 100.00                             Mills, Griffin, Ritson
operation             $ 50.00
travel                $ 100.00
                                 $ 250.00

for tech division     $ 200.00
for FESS              $ 200.00
                                 $ 400.00
total Fermi money
                                            $   1,092.00


                                       $ 2,742.00
total for Muon collider + neutrino source



• Travel:
         – I understand that this is an issue
         – Most of this work is done within and with the help of the
           collaboration
         – collaborations are dependent on communication


• Budget Situation (management point of view)
         – “60 cent from the $”         (John Marriner)



         – 6 month /0.6 = 10 month and all the money
                        Summary

• Is that an increase?
   – For man power: Yes: more than doubles the overall effort,
     explicitly for the next six month
   – For money:
       • Yes: expect 1.4 M$ compared to 710 k$ last year from DOE
       • Yes: from the Lab but how much ??

• What after six month:
   – Long Term goal and program

   – Study is crucial

				
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