12/5/2008NuMu Collaboration Friday Meeting 1 Status Report on MANX Proposal Draft Bob Abrams Muons,...

12/5/2008 NuMu Collaboration Friday Meeting

1

Status Report on MANX Proposal Draft

Bob Abrams

Muons, Inc.


2

Outline

• Background and Objectives

• Description of System

• MANX in MICE

• Upgrades to MICE


3

Background

• MANX LOI submitted to FNAL AAC in May, 2006 with intent to demonstrate ionization cooling at FNAL

• An updated LOI was submitted in July, 2007, with advances in the technology

• Last year Muons, Inc. joined the MICE collaboration• This proposal is aimed at measuring cooling in the MICE

beam at RAL as an extension of MICE• We plan to circulate the draft widely to solicit feedback

and attract more collaborators, then submit it to FNAL AAC and then to RAL


4

Advantages of running at RAL/MICE

• Great savings in cost and effort– Beam line exists– Spectrometer elements can be re-used– Data acquisition, reconstruction, and analysis

software will be a great asset– All aspects of MICE will have been thoroughly

tested and understood by the time we run


5

MANX Objectives

• Measure 6D cooling in a channel long enough for significant reduction of emittance

• Study the evolution of the emittance along the channel by making measurements inside the channel as well as before and after

• Test the Derbenev-Johnson theory of the HCC• Advance muon cooling technology


6

Other Considerations

• Muons, Inc. is largely responsible for the current draft

• MANX is a part of the Muons, Inc. multi-faceted program, but it is much too large to pursue by our traditional grants based on very specific innovations.

• We need to build a larger collaboration • We want to work toward the long-term

goals of achieving a NF/MC


7

System Described in Draft

• MANX Baseline is HCC as in LOIs– Helical solenoid magnet

• Best understood at this time

– Cooling by liquid helium• Eliminate safety concerns with use of hydrogen

– Absence of RF –> continuous energy loss• Eliminates cost and complexity


8

Uses of MANX HCC

• Pre-cooler for NF/MC

• Final stage of NF/MC cooling, before re-acceleration

• Use for intense stopping muon beams, of interest for Mu2e experiment and others

• Epicyclic HCC – Low energy loss (with RF)


9

HCC Description


10

Helical SolenoidAs Envisioned: 3.2m long ~60 coilsRing diameter: 0.5mGraded field 4T->2TIndividually poweredIdentical coils

Additional matchingSections needed?


11

Matching Sections? –Scheme 1

1. G4beamline representation of MANX HCC with 1.5 period long matching sections positioned between the MICE spectrometers

6D Emittance evolution


12

Matching Sections? Scheme 2:“Off-Axis”, No Matching Magnets

A G4beamline representation of the off-axis matching configuration where the HCC is placed at a 45º orientation to the MICE spectrometer so that the beam is oriented along the reference path at entrance into the HCC.


13

Off-Axis scheme (cont’d)

– No losses upon entering the HCC acceptance of the HCC is 50% larger than MICE spectrometer.

– Significant losses upon exit from HCC into downstream spectrometer.

– Design being optimized to reduce these losses.

• Also investigating shorter matching sections (~0.5 period)


14

Helium vs. Hydrogen as Coolant5m HCC Pre-Cooler Example

HCC pre-cooler filled with liquid hydrogen (blue) or liquid helium (red) With (dashed) and without (solid)1.6 mm thick Al windows on each end.

6D Emittance reduction factor: Helium: ~4X Hydrogen: ~6XHelium good, hydrogen better


15

MANX in MICE


16

Comparison of MANX and MICE

• MANX beam 350 MeV/c, MICE ~250 MeV/c

• MAX energy loss >MICE energy loss in cooler

• MANX (no RF) uses all beam, MICE (with RF) must use particles that are in Synch w/RF(~1%)

• MANX needs better longitudinal momentum measurement


17

MICE/ISIS Beam

MANX uses same elementsNew tune for 350 MeV/c

Simulations of new beam tune, rates in progress


18

Layout of MANX in MICE Hall

Move downstreamTracker and Cal fartherDownstream (or transversely)Remove MICE cooling apparatus

Install longer MANX HCC w/matchingSections (or without)


19

MANX w/Matching

Off-Axis MANX

MANX in MICE (Conceptual)


20

MANX Upgrades to MICE


21

Improved PLongit ResolutionExample L=3m p = 300 MeV/c muon, (γ=3)Β = 0.94t = 10.6 nsΔp/p = γ2 Δt/t

For Δt = 50 ps resolutionΔp/p = 3.6%For Δt = 50 ps resolutionΔp/p = 0.36%

Tom Roberts and Henry Frisch (U. Chicago) have an SBIR proposal for TOF counters with microchannel plate detectors


22

Trackers Inside HCCDetectors Coils

Cryostat Vessel

Feedthroughs Power inSignals out

MPPCs

Electronics

Signals out

Power in

Active area, fibers

Support/mounting frameScintillating fiber planesSimilar to MICE spectrometer.Use MPPCs(SiPMs) and onboard readout electronics

Consider 4 trackers (x, u, v(?) per set and possibly 2 more outside.

Bob Abrams and Vishnu Zutshhi (NIU) have an SBIR proposal on this topic.


23

Much Work Remains

• Simulations of 350 MeV/c Beam tuning and rates.

• Simulations of full MANX spectrometer including HCC and new detectors

• Reconstruction and fitting of tracks in HCC

• Analysis refinements and additions to MICE analysis SW


24

Recent Progress on HCC 4-Coil Model • Initial 4-coil model has been designed and

constructed Now being tested


25

Summary

• We have presented a preliminary draft of our concept of a full muon cooling demonstration experiment at RAL/MICE.

• We are willing to discuss/negotiate with potential collaborators on the best way forward.

• We want to do what is best for the community, and meet our existing and future commitments

12/5/2008NuMu Collaboration Friday Meeting 1 Status Report on MANX Proposal Draft Bob Abrams Muons,...

Documents

Transcript of 12/5/2008NuMu Collaboration Friday Meeting 1 Status Report on MANX Proposal Draft Bob Abrams Muons,...