Status of MICE Tracker System
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Transcript of Status of MICE Tracker System
Status of MICE Tracker SystemH. Sakamoto, Osaka University
(on behalf of the MICE Collaboration)
International Muon Ionization Cooling Experiment (MICE) • Muon storage ring is needed for the next generation of physics studies in neutrino
factory / muon collider• Muon Cooling is key issue to reduce muon beam phase space to capture as many
muons as possible in an accelerator• MICE will demonstrate the method of ionization cooling• MICE goal is to achieve 0.1% accuracy in the measurement of emittance(De/e~10%)
MICE Scintillating Fiber Tracker• Measure space and time coordinates of individual particles before and after cooling channel• Low material to avoid scattering in the detectors• Robust operation in the magnetic field and background from RF• Tracker Superconductive Solenoid produces uniform magnetic field of 4T• Measure hit positions at stations and reconstruct helix
Variable Diffuser
Beam PIDTOF 0
CherenkovTOF 1
Trackers 1 & 2 measurement of emittance in and out
Liquid Hydrogen absorbers 1,2,3Downstreamparticle ID:
TOF2KL and EMR Calorimeter
RF cavity 1 RF cavity 2
Spectrometer 1
Matching coils 1&2
Focus coil 1 Spectrometer 2
Coupling Coils 1&2
Focus coil 2
Focus coil 3
Matching coils 3&4
x0, y0
f0RT
]/Rcos[zRxx 0i LT0i f
/(0.3B)p R TT /(0.3B)p R LL
]/R[zsin Ryy 0i LT0i f
Z
Wavelength shift by secondary, 3HF
520nm
VLPC output0 p.e.
1 p.e2 p.e
Att. length of clear fiber
B=4TStation
Bundling
CCD image of fibers
Connectorization
LED Scan
Mount on vac. chuck Fix to Station frame
Apply glue Cut fibers
Light-yield vs. Fiber# (Station5)
Planes: V, X, W
Assemble connectors with light-guide
Apply glue from front
Apply glue from rear
Assemble test-cookie
Polish
Internal light-guide
Light reflection test
Visual Inspection
Bad fiber
SciFi Tracker Production
Conclusion• SciFi trackers based on 350-mm scintillating fiber have been developed to measure the emittance of
muon beam at MICE, in collaboration with Japan, USA and the UK.• Both upstream and downstream trackers have been constructed and cosmic-ray tests have been
performed at the Rutherford Appleton Laboratory by January 2009, which confirmed that both the trackers have the required quality for use in the MICE experiment.
Cosmic-ray tests at RALUpstream and downstream trackers have been tested by 2009 at RAL
SciFi Station15 Stations constructed by 2007 at Imperial College London
Light-guide85 light-guides constructed by 2008 at Osaka University
preampTriptADCA-FPGA
D-FPGA
FPGA
VLPC signal
Scin. light via Light-guides
VLSB boardsAFEIIt board
Tracker• 5 Stations mounted with optimized spacing• Will sit inside the spectrometer solenoid (Bz= 4T)
Station• Carbon fiber frame of 30 cm diameter• Three doublets laid out with 120 degrees angular spacing• 30 optical connectors attached (each one has 22 holes)• 4m-long light-guides attached (640 read-out channels)
Fiber doublets• Double layered to reduce dead space• Each layer comprised of 1500 fibers (350 mm diameter)• Seven neighboring fibers multiplexed• Assembled at FNAL
Visible Light photon Counter (VLPC)• High efficiency (QE ~85%)• Operated at 9K
Light-guides• Clear fibers of high transmission (att. length ~7.6m)• Total length of light-guide 4m (~50% loss)
AFEIIt /VLSB (VME LVDS Serdes Buffer) boards• AFEIIt boards for digitizing VLPC signals (512 channels)• ADC/TDCs are transferred to VLSB boards• Data readout by DAQ at the end of every spill
22-way optical connectorStation frame
Cross section view of fiber doublets
fiber
Fiber doublets arrangement
Internal light-guide
Measured light yield
SciFi TrackerUpstream and downstream tracker have been constructed by 2009 at RAL
SciFi Tracker QA ProceduresLight yield measurement performed using 57Co(122keV-g)Light transmission measurement performed using LED/CCD
Tracker ReadoutDAQ framework DATE (Data Acquisition Test Environment) developed by ALICE collaborators
Tracker Slow ControlUse when initializing AFEIIt boards/ monitoring Cassette temps.Front end GUIs (using EPICS)
EPICS Server EPICS ClientAFEIIt clients- Configuration- RunControl- Status (temp/heater)
monitoring
PVs for AFEIIt- CONFIG-ALL- TRIG-ENABLE- STATUS-ENABLE- TEMP- HEATER
r/w PV
EPICS front end GUIs for Tracker Slow Control
CCD image Analyzed image
Setup for light-yield measurement
CCD image of transmitted light
camera
Setup for transmission test Light-guide transmission distributions
External light-guide
DATA
MICE Beam line
MICE Cooling Channel
Mount on bridge
DATE DAQ front end GUIs
5 stations attached with frame
Attaching int. light-guidesto Station
Installing to light-tight tube Cabling int. light-guides in patch panel
Attaching ext. light-guides to cryostat
Call diagram of equipment’s routinesSetup for upstream tracker Ext. light-guides attachment
NIM/VME crate for trigger & data Light-yield distribution
Triplet/Space-point residuals
Upstream spectrometer SciFi Tracker (w/o light-guides)
Hits viewed in x-y
x
y
Hits viewed along z Single fiber doublets sheet Q.E. curves of VLPC and PMTs
VLPC (2x4 pixel)
Incoming muon beam