1. Status of MICE Tracker System H. 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 (  ~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 PID TOF 0 Cherenkov TOF 1 Trackers 1 & 2 measurement of emittance in and out Liquid Hydrogen absorbers 1,2,3 Downstream particle ID: TOF2 KL 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 x 0, y 0 00 RTRT Z Wavelength shift by secondary, 3HF 520nm VLPC output 0 p.e. 1 p.e 2 p.e Att. length of clear fiber B=4T Station Bundling CCD image of fibers Connectorization LED Scan Mount on vac. chuckFix to Station frame Apply glueCut fibers Light-yield vs. Fiber# (Station5) Planes: V, X, W Assemble connectors with light-guide Apply glue from front Apply glue from rearAssemble test-cookie Polish Internal light-guide Light reflection test Visual Inspection Bad fiber SciFi Tracker Production Conclusion SciFi trackers based on 350-  m 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 RAL Upstream and downstream trackers have been tested by 2009 at RAL SciFi Station 15 Stations constructed by 2007 at Imperial College London Light-guide 85 light-guides constructed by 2008 at Osaka University preamp Tript ADC A-FPGA D-FPGA FPGA VLPC signal Scin. light via Light-guides VLSB boards AFEIIt 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  m 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 connector Station frame Cross section view of fiber doublets fiber Fiber doublets arrangement Internal light-guide Measured light yield SciFi Tracker Upstream and downstream tracker have been constructed by 2009 at RAL SciFi Tracker QA Procedures Light yield measurement performed using 57 Co(122keV-  ) Light transmission measurement performed using LED/CCD Tracker Readout DAQ framework DATE (Data Acquisition Test Environment) developed by ALICE collaborators Tracker Slow Control Use when initializing AFEIIt boards/ monitoring Cassette temps. Front end GUIs (using EPICS) EPICS Server EPICS Client AFEIIt 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 testLight-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-guides to Station Installing to light-tight tube Cabling int. light- guides in patch panel Attaching ext. light-guides to cryostat Call diagram of equipment’s routines Setup for upstream trackerExt. light-guides attachment NIM/VME crate for trigger & data Light-yield distribution Triplet/Space-point residuals Upstream spectrometerSciFi Tracker (w/o light-guides) Hits viewed in x-y x y Hits viewed along z Single fiber doublets sheetQ.E. curves of VLPC and PMTs VLPC (2x4 pixel) Incoming muon beam