International News

1
International News
US increasing its visible support Operating
under financial constraints but slowing down
other parts of the MUCOOL programme to provide
resources to iMICE.
2
Solenoid Refrigerating
Solenoid Expected mid October - time scale
slipped by two months but no panic
(yet) Refrigeration A problem with the
discontinuation of the system which had been the
basis of the original plans. The replacement
system is more expensive however the process of
drawing down contingency funds has been
exercised. Expecting to order replacement this
week.
3
RF Power System from Berkley
Arrived at Daresbury and the renovation is
building momentum.
4
RF Cavity
The RF cavity under construction at Berkeley has
been electro-polished and is being prepared for
power at the Fermilab MTA
5
TRD SEPT04 Layout
Target
ISIS Beam
Particle identification PID
Iron Shield
Tracker
TOF0
TOF1
Iron Shield
TOF2 Ckov2Cal
Diffuser
Proton Absorber
Ckov1
6
Chkov1
CKOV1 University of Mississippi Summary
Frascati meeting Ray tracing optimization of
Mirror and PMT in progress Test Beam this
autumn Final design by January 06
7
Ckov2 University of Louvain
Back mirror
Particle entrance window
Optical windows, Winston cones, PMs
Aerogel box
Reflecting pyramid
Front mirror
various small elements (clamping pieces for
windows)
Particle exit window
8
8
Simulation of ckov2
No scattering
3 detectors hit !
Some ring imaging clearly visible on the screen
display .
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9
Aim of TOF stations Milan

• TOF0 experiment trigger
• TOF0/TOF1 PID on incoming muons
• TOF1/TOF2 PID on particle traversing the cooling
  channel
• Requirements
• Single detector resolution s60 ps
• High rate capability
• Sustain nearby B fringe fields

10
The environment
The beamline design puts harder and harder
requests on TOF stations

• Higher and higher particle rates ( now 2.3-2.8
  MHz for TOF0, it was 1 MHz at beginning)
• Request for thinner and thinner scintillators
  (to reduce multiple scattering)
• TOF stations in the fringe field of magnets
  quadrupoles for TOF0 (B 50-100 gauss),
  solenoids for TOF1/TOF2 (B.2 T)

11
TOF0 support structure
12
TOF Detector Layout

• TOF X/Y planes with PMTs at both ends
• TOF0 is placed after Q6.
• TOF1 is placed after Q9.
• TOF2 downstream
• Transverse sizes
• TOF0,1,2 are all 48?48 cm.
• Segmentation
• All stations are 2 planes arranged orthogonal to
  each other.
• TOF0 has 12 slabs in each plane. NO OVERLAP (to
  cope with higher rates)
• TOF1,2 have 8 slabs per plane. NO OVERLAP
• TOF0 environment
• Low field 100-200 g High rate 2.5 MHz.
• TOF1,2 environment
• High field 1-2 Kg Medium rate 0.5 MHz

13
Comparison of laser with cosmics calibration data

• The two calibration methods provide similar
  accuracy on the equalization constants d
• The shifts of equalization constants (Dd)
  measured with the two methods are well correlated
  (within 100ps)

Shifts of calibration constants from 2001 to 2002
data taking
70ps
cosmics
laser
M Bonesini IEEE 2002
14
TOF Conclusions

• design for TOF stations well understood
• only some points to be defined connected with
  choice of size of TOF1/TOF2 PMTs (1.5 vs 2) and
  divider for TOF0 PMTs (booster vs active divider)
• define electronics chain (TDC for high incoming
  rate) probable choice CAEN V1290
• define the high-demanding calibration system
  (mainly laser based)
• test a prototype asap at LNF BTF, together with
  EMCAL

15
Test Beams
UK Focus on two test beams KEK late
September testing the tracker ISIS Early
January testing the production target
16
Tracker Prototype

• Fourth station completed and new tracker
  assembled with 4 stations at Imperial.
• New waveguides manufactured in Japan. Optical
  connector at Station end much easier to use!
• Tracker was made light-tight at Imperial and
  shipped to Fermilab for cosmic-ray testing.
• Now in Japan being setup for test-beam.

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18
ACC and TOF Performance
19
VLPC with MICE Cryostat

• We have two D0 VLPC cassettes (1024 channels
  each).
• MICE cryostat, using Sumitomo cryocoolers has
  been operating at Fermilab since May.
• Now operating well at KEK.
• LED calibration data taken at Fermilab as well as
  3606 cosmic ray triggers.

20
FNAL Cosmic Ray Setup
21
High Gain Cassette - More Light
Made with G4MICE
22
Test Beams Isis
Background Isis beam 50 Hz rep rate. Injection
every 20ms. Acceleration 10ms. Fast
extraction. MICE target dips into the beam during
the last 2ms by upto 35 millimetres Must be out
by the next injection 10ms later.
23
Target questions

• Satisfy ISIS that we can create a system which
• Will not compromise the vacuum
• Whose reliability does not compromise ISIS
  operation
• Removes a maximum amount of ISIS beam

Determine whether what muon flux we can produce
within these constraints.

• Aims of the tests
• Run a prototype target
• Characterise the beam

24
Hall Switches (Control)
Position Sensor (Monitor)
25
Target questions
A target has been created and put through bench
tests
It works with some provisos continuous
oscillation one shot operation needed for
synchronisation with ISIS not made of vacuum
safe materials
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Target answers i
Plans
Necessary improvements Creation of a version in
vacuum safe materials Improvement of the
electronics to allow one shot operation
Desirable improvements Upgrade the electronics to
increase the power and hence the acceleration. At
present the acceleration is not sufficient to get
the target in and out in the required time.
27
Target answers ii
Desirable improvements Upgrade the electronics to
increase the power and hence the acceleration. At
present the acceleration is not sufficient to get
the target in and out in the required time.
January running 50/128 Hz means that the target
does not have to be out in 10ms Start of
insertion can be moved back in time to allow
sufficient target insertion.
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• Timetable
• Design review end September
• Test mechanical assembly late October.
• Vacuum reliability tests November.
• Decision on readiness end November.
• Install in ISIS from early January
• ISIS closes 20th January.
• Test run from 23rd January (100 pulses? Over a
  few days).
• Remove by 31st January.

29
Particle flux measurements Glasgow

• Prepare for system test end 2005 inside ISIS at
  10 m, 20 m.
• Set-up test station at Glasgow with UNIDAQ and
  read-out electronics in progress, some technical
  problems with DAQ (talking to Makoto)
• Test all PMTs and validate performance
• Purchase Bicron BC-404 scintillator
  light-guides.
• Full system fully tested by November 2005
• Purchase polyethylene absorbers
• Install equipment in ISIS during December-January
  (ISIS shutdown)
• Set-up triggering electronics and gated scalers
  for target monitoring
• In parallel, perform more accurate simulations
  in progress
• Calculate particle momenta coming out of target
• Run test-beam set-up at 10 m and 20 m using
  different absorbers
• Determine rate per scintillator slab for
  different configurations
• Write proposal to ISIS target November 2005

30
Conclusions
Work is building momentum. Progress is happening
in all the components Problems are arising and
(thus far) being solved
31
Advert

• CCLRC/PPARC seeks to position UK strategically
  w.r.t.
• International Linear Collider
• Neutrino Factory
• Other accelerator-based scientific facilities
• Key component high-gradient cavities
• Develop manufacturing capability
• Neutrino Factory application
• Proton driver
• Front-end 234 MHz, RFQ, buncher cavities,
  chopper
• Could be SC linac SPL (352 MHz), FNAL (1.3 GHz),
  
• Synergy with ILC
• Phase rotation, buncher and cooling channel
• Require large aperture ? low frequency
• Transport solenoidal channel ? cavities operate
  in strong B field
• Use warm cavities at low (200 MHz 300 MHz)
  frequencies

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Collaboration

• So far
• US LBNL (some advice/contact from/with JLab)
• UK IC Phys/Mech.Eng., advice and contact from
  CCLRC, RAL and DL
• Proposal
• Cavity
• US LBNL, FNAL (MuCool, MTA), JLab?
• UK IC, CCLRC, HPRF Faraday (E2V, Shakespeare)
  Cockroft
• Note Industrial CASE application ICL/HPRF
  Faraday submitted
• Coupling coil
• GVA
• Timescale
• Submit October/November

Proposal Design, manufacture and commission
201MHz cavity
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Design from Imperial Mech. Eng.

• Contact Ken Long