Status of MICE Tracker System

1. RT f0 x0, y0 MICE Cooling Channel Coupling Coils 1&2 Matching coils 3&4 Matching coils 1&2 MICE Beam line Focus coil 1 Focus coil 2 Focus coil 3 • 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%) Spectrometer 1 Spectrometer 2 Incoming muon beam Beam PID TOF 0 Cherenkov TOF 1 RF cavity 1 RF cavity 2 Downstream particle ID: TOF2 KL and EMR Calorimeter Liquid Hydrogen absorbers 1,2,3 Variable Diffuser Trackers 1 & 2 measurement of emittance in and out • 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 • 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 • 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 layeredto reduce dead space • Each layer comprised of 1500 fibers (350 mm diameter) • Seven neighboring fibers multiplexed • Assembled at FNAL Status of MICE Tracker System Upstream spectrometer SciFi Tracker (w/o light-guides) Att. length of clear fiber Internal light-guide Wavelength shift by secondary, 3HF Cross section view of fiber doublets External light-guide Single fiber doublets sheet Q.E. curves of VLPC and PMTs Station Hits viewed along z B=4T AFEIIt board VLSB boards Scin. light via Light-guides Z Hits viewed in x-y 22-way optical connector DATA 520nm VLPC (2x4 pixel) Fiber doublets arrangement y Station frame FPGA x VLPC output D-FPGA 0 p.e. A-FPGA 1 p.e ADC 2 p.e Tript fiber preamp VLPC signal SciFi Tracker Production SciFi Station 15 Stations constructed by 2007 at Imperial College London Light-guide 85 light-guides constructed by 2008 at Osaka University SciFi Tracker Upstream and downstream tracker have been constructed by 2009 at RAL Connectorization Mount on vac. chuck Fix to Station frame Assemble test-cookie Apply glue from rear Assemble connectors with light-guide Attaching int. light-guides to Station Attaching ext. light-guides to cryostat Bundling 5 stations attached with frame Internal light-guide H. Sakamoto, Osaka University (on behalf of the MICE Collaboration) Cabling int. light-guides in patch panel Installing to light-tight tube Apply glue Cut fibers Apply glue from front Polish Visual Inspection Light reflection test Mount on bridge Bad fiber • SciFi Tracker QA Procedures • Light yield measurement performed using 57Co(122keV-g) • Light transmission measurement performed using LED/CCD • Tracker Readout • DAQ framework DATE (Data Acquisition Test Environment) developed by ALICE collaborators • Cosmic-ray tests at RAL • Upstream and downstream trackers have been tested by 2009 at RAL LED Scan CCD image Analyzed image Setup for upstream tracker Ext. light-guides attachment Call diagram of equipment’s routines DATE DAQ front end GUIs CCD image of fibers NIM/VME crate for trigger & data Light-yield distribution • Tracker Slow Control • Use when initializing AFEIIt boards/ monitoring Cassette temps. • Front end GUIs (using EPICS) EPICS front end GUIs for Tracker Slow Control Setup for light-yield measurement r/w PV Light-yield vs. Fiber# (Station5) EPICS Client EPICS Server Triplet/Space-point residuals • AFEIIt clients • - Configuration • RunControl • Status (temp/heater) monitoring • PVs for AFEIIt • CONFIG-ALL • TRIG-ENABLE • STATUS-ENABLE • TEMP • HEATER Planes: V, X, W • Conclusion • SciFi trackersbased 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 testshave 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. Setup for transmission test Light-guide transmission distributions camera CCD image of transmitted light Measured light yield