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 ID: 396272
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Slide1
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 colliderMuon Cooling is key issue to reduce muon beam phase space to capture as many muons as possible in an acceleratorMICE will demonstrate the method of ionization coolingMICE 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 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
f
0
R
T
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. 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-
m
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
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-
g
)
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 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-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 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