Muon Collider R&D at the MuCool Test Area Andreas Jansson Muon Beam Experiment at the MTA

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 2 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 R&D 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 R&D 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 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 R&D 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! … [Fermilab AAC report, January 30, 2007]

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 3 Foreseen MCTF Experimental R&D 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.

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 4 6DMANX [Cummings et al, “A SIX-DIMENSIONAL MUON BEAM COOLING EXPERIMENT”, EPAC06] Helical Cooling Channel Default option: stick it in the MICE beamline at RAL… … but, maybe it could be done in another way…

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 5 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(?)

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 6 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 MiniBoone well 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 R&D, 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.

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 7 Muon beam at MTA? Can we make a muon beam at MTA with suitable momentum and sufficient intensity?

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 8 Target, pion capture and decay channel Carbon target in 6T solenoid. Quadrupole decay channel (PAC’01 design) N. Mokhov/V. Balbekov

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 9 Preliminary simulation results MARS model of target and decay channel (PAC’01 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!

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 10 Beam purity (preliminary) Main contaminant is π+ (50%), π- (~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+

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 11 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).

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 12 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.

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 13 4D Raster Scan x’ x x y’ y y E t E t Beam “Pencil beam” Macro-particle

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 14 5D Raster Scan x’ x x y’ y y “Pencil beam” Macro-particle E t E t

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 15 Pencil beam experiment layout Transverse collimation Momentum selection Energy distribution measurement Position and angle measurement Steering dipoles Electrostatic separator? Decay channel HCC

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 16 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.

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 17 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

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 18 What About the 6 th 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. Σ Σ start stop µ+

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 19 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

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 20 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)…

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 21 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 anyone’s interested…

2/1/2007NFMCC meeting, UCLA, Jan 29-Feb 1, 2007A. Jansson 22