Transcript Sci-Fi Tracker: Progress Report Malcolm Ellis, MICE Video Conference Wednesday 6th October 2004

Sci-Fi Tracker: Progress Report
Malcolm Ellis, MICE Video Conference
Wednesday 6th October 2004
Outline
• Summary of tracker workshop
– Station layout, patch panel, station mould and
assembly area
– Ribbon fabrication and VLPC cryostat design
• KEK test beam
• Simulation/Analysis
– TURTLE
– RF Background
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Tracker Workshop
• 9th – 11th September at Imperial College
• Discussed:
– mechanical design and component manufacture
– ribbon fabrication and support structure
– VLPC cryostat design and AFEII status
– KEK test beam
– quality assurance
– simulation and emittance calculation
– work on MICE note
• http://www.mice.iit.edu/modules/tracker/ftw4/ftw4.html
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New Station Layout and Connectors
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New Station Support
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Patch Panel
This is the patch
panel model. It is
not the definitive
model as detailed
drawings will be
required to mate it
to the magnet. This
model gives space
for 26 connectors.
As only 25 are
needed, the 26th
opening can be used
for field monitoring
services.
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Station Mould
This sequence shows the station mould being produced in the Liverpool workshop
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Assembly Area
The area has now been
painted and the
majority of the
assembly equipment
moved in. The lighting
has been improved and
we now need to reconnect the stages
and the microscope.
It is ‘quite roomy’
compared to our old
assembly area, ,
although none of the
QA stations are set up
yet.
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Ribbon Fabrication
• All fibres have been aluminized
– 4000 2500 ppm 3HF
– 4000 5000 ppm 3HF
• New test ribbon was fabricated (training for Roger Hare) in August.
Looked very good
• Four production ribbons have since been produced and delivered to
London
• Procedure:
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–
–
–
–
–
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Mould preparation
Vacuum seal and bed in teflon sheet
Define the boundaries of the plane
Lay the first two layers of fibres
Mix and apply polyurethane
Lay Mylar sheet
Pressure plate and clamping
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Applying Polyurethane
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Laying Mylar Sheet
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Clamping
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VLPC Cryostat Design
• Drawings are complete and have been checked.
• Concept hasn’t changed since June KEK
meeting. Detailed design has been finished
since then.
• The drawing package is complete and has been
forwarded to KEK.
• Outstanding questions have been resolved.
• The cryo-cooler (Sumitomo 415D) has arrived at
University of Illinois.
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Main and Lid Assembly Drawings
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KEK Test Beam
• Beam time request on the p2 line at KEK.
• Planned test of 4 stations (original 3 from
prototype plus 4th being built now) in order to
finalize design.
• Use BESS magnet (1T field) in order to make
momentum measurement, look at pattern
recognition in real detector compared with
simulation, etc...
• Planning for two short shifts (~1 week each)
• Work underway to design support structures,
build a DAQ system that can be operated
outside of Fermilab, sort out particle ID,
triggering, etc...
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BESS Magnet
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Simulation/Analysis plans
• Input beam description:
– Was using G4BeamLine, however do not
have the time/expertise to produce large
statistics.
– Kevin Tilley has provided 700k events from
TURTLE, which can now be used in G4MICE.
– Both simulations are of the “June04” beamline.
– First comparison between the two shows
reasonable agreement
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G4BL vs TURTLE
PZ (MeV/c)
PT (MeV/c)
Solid histogram is from G4BeamLine and the dashed is from TURTLE
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RF Background
• Have made first run using latest RF background
code from Rikard.
• This code uses a lot of CPU (2~3 events per
hour on an IC machine).
• Hopefully it will be possible to use a sample of
RF produced by Rikard to generate the large
statistics in a week or so (as discussed at the
last VC).
• Otherwise, I will make a low statistics run with
background and do high stats without.
• Good news – the new background code
produces a lot less hits in the tracker...
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RF Background Simulation
• New RF background
is the solid histogram
• Old simulation
produces the dashed
histogram.
• No longer see
extremely high hit
count in the Sci Fi
due to the RF!
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Production Plans
• Yagmur plans to commit an improved description
of the cooling channel this week.
• At that point, I will start the production of
simulated data from the TURTLE files that Kevin
has provided.
• If a quick RF BG simulation is available, it will be
used, otherwise a parallel production of much
lower statistics using Rikard’s existing code will
also be launched.
• This should (hopefully) allow just enough time to
then perform the digitisation and reconstruction
in time for the meeting at RAL...
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