Muon Collider R

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Muon Collider RD at the MuCool Test Area
Muon Beam Experiment at the MTA

• Andreas Jansson

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Fermilab Muon Collider Task Force

• To Vladimir Shiltsev and Steve Geer
• From Pier Oddone
• Subject Muon Collider Task Force
• I would like to ask the two of you to form and
  lead a Task Force to develop a plan for an
  advanced RD program aimed at the technologies
  required to support the long term prospects of a
  Muon Collider. In doing so I would ask that you
  operate in consideration of the attached charge,
  taking special note of the deliverables requested
  for September 2006 A report outlining a plan for
  developing the Muon Collider concept based on
  recent ideas in the realm of ionization cooling,
  and an associated cooling RD plan that can be
  implemented starting in FY2007. Following receipt
  of this report I will expect to initiate the Muon
  Collider study, including the associated cooling
  channel study and development program, in 2007.
• The Muon Collider represents a possible long term
  path for extending the energy frontier in lepton
  collisions beyond 1 TeV. It is important to
  establish the possibilities and to outline the
  RD program that will be necessary to develop the
  underlying technology base. I look forward to
  working with you to formulate and execute a plan
  to explore these possibilities and to provide
  options for Fermilab and the world HEP program in
  the future.

Bottom line the director is supportive!
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Foreseen MCTF Experimental RD

• Low energy proton beam to MTA
• Foreseen since before, but delayed due to
  budgetary restrictions. We pushed for it, but not
  part of MCTF proposal.
• Proton intensity upgrade for MTA
• Part of MCTF proposal to Director
• Muon beam to MTA
• Initially to test Helical Cooling Channel, which
  is also part of MCTF proposal.

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6DMANX
Helical Cooling Channel
Cummings et al, A SIX-DIMENSIONAL MUON BEAM
COOLING EXPERIMENT, EPAC06
Default option stick it in the MICE beamline at
RAL but, maybe it could be done in another
way
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First, a disclaimer

• Investigating a muon beam experiment does not
  constitute a decision.
• The (HCC) demonstration experiment should be done
  the way that makes most sense.
• We should agree on what we want to demonstrate,
  and to whom!
• Need simulations to make informed decision.
• Single particle a la MICE by Muons Inc?
• Macro-particle (pencil beam) by Fermilab MCTF
• Other bright ideas by anyone?
• Initial results by PAC07(?)

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Why at MTA?

• MTEST
• very low intensity, energy of muons on the high
  end,  issues with radiation shielding and
  compatibility with ongoing ILC tests, to cryo,
  rate limited by Main Injector availability
• MiniBoonewell matched energy, but no space (need
  new civil construction), no cryo, unclear
  availability (existing programme), relies on
  Booster availability
• MTA restricted space, muon energy on the low
  end, high beam availability, facility dedicated
  to muon RD, cryo will be available
• (Pbar debuncher)
• not considered (compatibility with proton
  plan?), but if MECO becomes a reality should
  reconsider

NB. A lot of the discussion is independent of
location.
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Muon beam at MTA?

• Can we make a muon beam at MTA with suitable
  momentum and sufficient intensity?

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Target, pion capture and decay channel

• Carbon target in 6T solenoid.
• Quadrupole decay channel (PAC01 design)

N. Mokhov/V. Balbekov
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Preliminary simulation results

• MARS model of target and decay channel (PAC01
  design 42m long).
• Working on simulations with shorter channel.
• Total yield 1e-6.
• Emittance (rms, unnormalized) of 500 Pi mm mrad

N. Mokhov/V. Balbekov, more detail at LEMC at
Fermilab in February!
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Beam purity (preliminary)

• Main contaminant is p (50), p- (1) and µ-
  (1).
• Protons are absorbed in target.
• Need to separate pions from muons
• Use a Tevatron electrostatic separator (Wien
  filter)?
• 2.5m long, 2MV/m, gives a differential kick of
  10mrad
• Many will be available, soon
• Alternative thin target to range out pions.
• Would affect muon momentum

Pi Mu
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Preliminary MTA Muon Beam Parameters

• 250 MeV/c average muon momentum, 50MeV/c momentum
  spread
• 1e6 muons per pulse maximum (peak rate of 2e11
  µ/second).
• Expect to loose two orders of magnitude in
  reducing transverse emittance (simulations
  underway).

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Macro-particle experiment

• It is very hard to measure the emittance of a
  large beam, especially in the presence of
  non-linear forces.
• Use pencil beam as macro particle and scan the
  aperture!
• Beam position and angle easy to control and
  measure.
• Can use relatively simple detectors (10000 MIPS
  vs 1 MIPS).
• Insensitive to muon decays (average position is
  insensitive to 1 particle out of 10000).
• Can measure transverse non-linearities and
  acceptance.

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4D Raster Scan
Pencil beam
x
y
E
x
y
t
x
y
E
t
x
y
Beam
Macro-particle
Macro-particle
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5D Raster Scan
Pencil beam
x
y
E
x
y
t
x
y
E
t
x
y
Macro-particle
Macro-particle
Macro-particle
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Pencil beam experiment layout
Steering dipoles
Position and angle measurement
HCC
Energy distribution measurement
Decay channel
Electrostatic separator?
Transverse collimation
Momentum selection
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First Pass at Optics

• Dispersion free bend with space for momentum
  selection and momentum spread measurement.
• Matching into HCC with space for steering dipoles
  and diagnostic
• Need to refine and add eg electrostatic
  separator.
• Need to simulate in eg G4BeamLine.

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Instrumentation

• Fiber tracker developed by PPD for MTEST
• Single MIP sensitivity depending on fiber size
  and electronics
• Can probably be used directly in beam lines
• May be modified for use in LHe?

H. Nguyen et al
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What About the 6th Dimension?

• Near isochronous HCC is important for adding RF.
• Lowering the muon rate, one could do a dedicated
  run to measure time-of-flight distribution as
  well.
• Need to investigate sensitivity and error
  sources.

µ
S
stop
S
start
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Possible extensions to the program

• Simplest way to add RF to HCC is to interleave
  HCC sections with RF sections.
• Could be added as a second phase.

HCC with matching sections
HCC with matching sections RF
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To do (not exhaustive list)

• Investigate validity of macro-particle assumption
  (maximum emittance).
• Re-optimize HCC for 250MeV/c.
• Improved design and simulations of target, decay
  channel and pion separation.
• Refine the experimental setup, including beamline
  optics, collimator design and detectors.
• Simulate, simulate, simulate (to understand eg
  systematics)

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Conclusions

• Fermilab director supportive of Muon Collider
  work
• Hopefully, this moral support will eventually
  translate into a fresh infusion of money.
• As part of the MCTF work, we are investigating
  the possibility of a muon beam at MTA.
• Could be used to test the HCC prototype magnet.
• We plan to study the performance of such an
  experiment in more detail, and (hopefully)
  compare to alternatives.
• Could use help, if anyones interested

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