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