The MICE collaboration

1
MICE COLLABORATION Columbia University June
2003 Action List (online)

1. Funding and some organization
2. Integration issues
3. Detector issues
4. Beam line
5. RF backgrounds
6. RF power source
7. RF cavities

2

• Funding of experiment
• cost saving hunt
• Items
• 0. PSI solenoid. crossed out. what is the
  garantie on this? (e.g. Does Switzerland need to
  add a few 100K for possible after-sale
  problems?) agreement between PSI RAL on
  radiation disposal
• A. fridge at RAL savings from
• running the PSI solenoid with two phase helium
  instead of supercrit.
• Action Mike Green Bradshaw interact and -gt
  walter.gloor_at_psi.ch
• reducing VPLC channel count by 7 or How much
  does this represent?
• Action Iouri or Bradshaw to estimate difference
  refine cast.
• B. Issue of common funds need to reach a
  reasonable proposal to the
• collaboration. Action Alain, Dan, Ken L. (SG
  item)
• C. power sources it is urgent to have a good
  plan and to estimate how much funding (beyond
  already requested) is needed. Encouraging results
  from RAL reformed TH116 tubes. more discussion
  to take place.
• Action TF Helmut, Paul, Roy, CERN guys (Vretenar
  or Pirkl)

3
--gt Integration issues 1. good progress from
the AFCSWG proposed a scheme with absorber
removable from the end. Notes original scheme
of Study II. flexibility for later absorber
choices construct coil in one unit at one
place. No objections were raised. Action
Endorse remaining choices concern mainly
absorber itself. internal safety review end of
2003. gt action P. Drumm and A.B. to nominate
the internal review committee after discussions
in Mice SG and interested parties. 2. It was
requested that more integration tasks are soon
necessary -- 2.1 RF cavity coupling coil
assembly -- 2.2 focus pair detector solenoid
and detectors. (shield -- HV protection
etc..) 2.3 real estate of detectors in the
solenoid ends. When will it be appropriate to
start on this? Probably wise to have a first go
at it while AFCSWG works. Action SG
4
Detectors
1.downstream PID. Grichine observed inadequacy
of present layount for muons of 200 MeV/c and
below. Action study problem for well defined
momenta from 120 MeV/c to 260 MeV/c
Grichine, Tortora needed angular space
distribution of muons from MICE Action Yagmur
and software group to generate samples of muons
at different momenta (large emittance but
monochromatic) More work needed on Cherenkov to
adapt it to new momentum conditions, and
possibly reduce size. Interest expressed by D.
Winn (Fairfield/Iowa) to participate
here. Action Gregoire/Summers and Cherenkov
group
5
2. tracker choice
A. sci-fi. Proceeding to build a full station
with part of readout. (very nice) Multiplexing
needs to be done at level of detector itself.
Question of upgradability? Problem raised of
effect of photons bouncing on structures or
extracting electrons from them and generating
noise signals. (needs to be evaluated by
MC) Fairly complete on software side (missing
Muxnoisex-rays) B TPG. Going ahead with full
size readout detector and HARP test. A small
chamber worked already (signals from 55Fe!). Mini
TPG being built. RF pickup and effect of x-rays
is a concern to be addressed by the group. Will
have a go at a commando operation at lab G. Other
methods may be of interest (RF antenna, tagged
sources.) NB software is behind wrt x-ray
simulations, pattern recognition. AB test at
Cornell? C. choice criteria. complete list was
drafted by Summers and Gregoire (thanks!) groups
-- and others! -- should go through it list and
agree before (1 july?). Upgradability and
manpower needed for operation and maintenance
should be considered Action get ready for
October 31st.
6
3. TOF no more than one particle (of any type!)
every 20 ns / counter. safety margin of at least
a factor sqrt(10-3) needed 1 hit / 600 ns
about. some tracking will be need in the beam
line. It was stressed that for momenta up to
240 MeV/c 10m of flight is an overkill. (was
calculated at 300 MeV/c.) would 6m be
enough? beam size at TOF ?
beam line As it is the beam line
is very simple and lacks optical components wrt
standard ones. (cf PSI, RIKEN) ? need more
calculations to assert need for hardware and
possible solutions around it. Action Drumm,
Palmer, Roberts At the same time hunt for
hardware to be borrowed around the world (several
appropriate quads or two coils) would not hurt.
Action reward for finding appropriate
hardware!
7
RF background MICE would like to understand how
much reduction on x-ray/electron emission can
reasonably be hoped with e.g. coatings. ?
Request to MUCOOL (Norem et al) to integrate such
plans in work programme at Fermilab. use G4MICE
to evaluate heat load from x-rays in the
absorbers and coils.
RF cavities. 1st prototype of MICE cavity is in
the process of being built. (big progress!)
Issue of availability/feasibility of the right
magnetic field map for tests in magnetic
fields Action Zisman