2005/10/24

KEK Beam Test for MICE SciFi Tracker - KEK-PS T585 M. Yoshida

MICE CM@RAL 2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 1

Contents

   KEK-PS T585 setup Beam properties SciFi tracker (quick) analysis 2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 2

Tracker prototype test in KEK KEK-PS T585

   MICE SciFi tracker group planed testing prototype to check basic performance in 1 Tesla solenoid magnet.

KEK-PS T585 was performed in Sept. – Oct. 2005 by world-wide collaboration.

Participants: more than 20 people joined.

 M. Yoshida, K. Yoshimura, H. Sakamoto, A. Horikoshi, K. Sakai, Yoshi Kuno, A. Sato and several students    Aron. Fish, Roger. Hare, K. Long, M. Ellis Amit Klier, Kwame. Bowie, Xiofeng Yang, Alan Bross , P. Rubinov J.S. Graulich KEK-PS p 2 beamline MICE CM at RAL, KEK test beam, Makoto Yoshida 2005/10/24 3

T585 Setup

2005/10/24 1-Tesla SC solenoid magnet MICE CM at RAL, KEK test beam, Makoto Yoshida A. Horikoshi 4

Aerogel Cherenkov Counter

     Refractive index : n=1.05

7 blocks x (100mmx98mmx11mm) Reflection in Al case with Goretex Sensitive to muons of 328 - 434 MeV/c 95% muon eff. <-> 5% pion contamination 2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 5

Experimental Hall / T1 / ACC

ACC T1

2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 6

4-Station Tracker Prototype

Old waveguide 400cm

BEAM

2005/10/24 internal waveguide 120cm External waveguide 400cm VLPC 2 cassette 2048 ch MICE CM at RAL, KEK test beam, Makoto Yoshida 7

Tracker installation

2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 8

  

TOF setup

2.5inch finemesh PMT (R6504S)

5+5 hodoscope (2cm thick + 2cm thick) PMT A

Light guide Scintillater 2005/10/24 2005.9.26

TOF 1 →5 MICE CM at RAL, KEK test beam, Makoto Yoshida

PMT B

9

    

DAQ

VME ADCs/TDCs for beam counters VLSB (VME LVDS SERDES BUFFER) for VLPC Trigger logic on NIM A lot of delay cable Linux-PC/Windows-PC with Bit3 interface    Hardware check with test program on Windows-PC Slow control (AFE initialization, Bias setting, Temperature control) and readout of VLSB is done by standalone program, “ VLPCdaq ” on Lunux-PC Integrated DAQ for beam counters and VLPC in the framework of UniDAQ on Linux-PC   PIO access on every event:   > 2kHz for beam counter ~50Hz for VLPC GUI controller to select detectors to be readout  Switch to select run mode  beam / pedestal / LED MICE CM at RAL, KEK test beam, 2005/10/24 Makoto Yoshida 10

History of T585

             2005.Feb / May : KEK beam test for TOF / ACC R&D 2005.Aug. 24 : VLPC system was delivered to KEK.

  Cryostat commissioning Keep cooling until Oct. 7 Sept. 7-14 : test bench for DAQ/Trigger logic setup. Sept. 20 : Remove USHIWAKA magnet and cleanup p 2 area Sept. 21-24     Set the solenoid magnet investigate fiber mapping on the 4 th Install the tracker Install TOF, ACC and beam counters.

station of tracker Sept. 27 : Accelerator tuning started Sept. 28  – Oct. 1 : Started setting VLPC, checking pedestal, test charge injection TOF calibration run, ACC calibration run and beam survay in the nights.

Sept. 29 : Okonomiyaki party Oct. 2-3 : VLPC system commissioning. Timing tuning for LED on VLPC.

Oct. 3 : Waveguides were plugged on VLPC cassette.

Oct. 4-5 : Timing tuning on VLPC trigger for beam Oct. 6  – Oct. 7 : Stable data taking.

5pm on Oct. 7 : data taking ended. immediate removal of all equipment in the experimental area.

End-Run party at Sutamina-TARO: buffet of meat, SUSHI, and many kinds of food.

2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 11

2005/10/24

DATA Set

 VLPC LED     Magnet ON / OFF  1 Tesla solenoid Beam momentum   3 GeV/c 0.25 – 0.4 GeV/c Rotation  0 / 3 deg. / 6 deg.

Al target just upstream tracker to produce multi track MICE CM at RAL, KEK test beam, Makoto Yoshida 12

2005/10/24

Light yield in ACC

3 GeV/c p m 

= 277 cnts = 49 cnts

After-pulse in High-gain PMT causes the tail

N pe

(

ACC

)      277 2

mean

  32 2 p.e.

49 10 fine-mesh PMTs surrounded Aerogel block Large light yield in Aerogel with refractive index of n=1.05

Ability to distinguish muons against electron/pion background MICE CM at RAL, KEK test beam, Makoto Yoshida 13

Particle identification by TOF & ACC

2005/10/24 e 400MeV/c m p Time of flight (ps) MICE CM at RAL, KEK test beam, Makoto Yoshida  Good PID performance for e /m/p 14

Timing resolution of TOF counter

Run1255, -3GeV/c

TOF 1 2 3 4 5 6 7 8 9 10

TOF8-T1 

= 74ps

    After slewing correction  (TOF8-T1)=74ps  (T1)=45ps   (TOF8)=60ps 2005/10/24 -400 MICE CM at RAL, KEK test beam, Makoto Yoshida 400 ps 15

Timing resolution of TOF counters

May test (KEK-PS T571) This test (KEK-PS T585) 2005/10/24 Difference in two tests • TDC: CAMAC (28 ps resolution)  • ADC: CAMAC (0.6 pC/count)  VME CAEN V1290 (25 ps) VME CAEN V792 (0.1 pC/cnt) Combination of horizontal and vertical counters   < 50ps MICE CM at RAL, KEK test beam, Makoto Yoshida 16

Timing resolution of TOF hodoscope -300 

= 60 ps

    Hodoscope = Combination of Horizontal and Vertical counters  (hodoscope-T1)=60ps  (T1)=45ps  (Hodoscope)=40ps 300 ps (Average of horizontal and vertical TOF counters) -T1 2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 17

 

Time of flight measurement

for various momentum good m/p separation > 3  e e Can measure:   muon fraction in beam beam momentum from timing difference of e m & e p e 2000ps m p e m 2000ps p m 2000ps p MICE CM at RAL, KEK test beam, Makoto Yoshida m p 2000ps 2005/10/24 18

234 MeV/c

Measured beam momentum by TOF

310 MeV/c 386 MeV/c

6 3 deg.

6 3 deg.

6 3 deg.

229 MeV/c 303 MeV/c 376 MeV/c RUN# RUN# RUN#

Beam momentum is measured to be quite stable within a few MeV/c for the setting of 250MeV/c – 400 MeV/c 2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 19

Analysis on Tracker

    LED calibration Photon yield 2D Tracking  Fiber Alignment 3D Tracking  Reconstruct spiral track in solenoid magnet MICE CM at RAL, KEK test beam, Makoto Yoshida 2005/10/24 20



VLPC gain calibration

Gain is estimated by gaussian fitting on LED data 1 p.e.

pedestal

AFE board #106 MCM #1 Channel #1 AFE board #107 MCM #1 Channel #1

~ 8 cnts/p.e.

MICE CM at RAL, KEK test beam, Makoto Yoshida 2005/10/24 21

DEAD CHANNEL

 

VLPC dead (estimated by LED run)

 AFE board# 104: ? channels   # 107: 3 channels # 106: 4 channels 

“

Fiber dead

”

 # 105: 4 channels

(estimated by normal run)

NOT YET STUDIED....

MICE CM at RAL, KEK test beam, Makoto Yoshida 2005/10/24 22

Photon signal of SCIFI

Raw signal converted into photo electron after subtracting common mode

RUN# 1255 B=0T , Rotation=0deg, w/o diffuser

10 p.e.

20 p.e.

2005/10/24 We are checking light yield in selected fibers on reconstructed track for each station / each view MICE CM at RAL, KEK test beam, Makoto Yoshida 23

2D TRACKING

W VIEW

  HIT  Fibers over 2.5 p.e.

FITTING     Minimum chi-square fit X view : y position Yx

Yx Xuv

V view : x position Xuv crossed with X view W view: x position Xuw crossed with W view

V VIEW

Y Xuw

X VIEW

X BEAM

#1 2005/10/24 #2 #3 MICE CM at RAL, KEK test beam, Makoto Yoshida #4 24

VIEW alignment in a Station

V VIEW W VIEW

Xv Xw

X VIEW

X position Xw

MICE CM at RAL, KEK test beam, Makoto Yoshida Good agreement within V view and W-view  good fiber sheet arrangement on the station 25 2005/10/24

MAPPING/ FIBER ALIGNMENT

After some bug-fix on mapping.....

2005/10/24

Fiber # (station 1) Fiber # (station 1) Consistent with beam divergence, but still need to carefully check on every combination of the stations

MICE CM at RAL, KEK test beam, Makoto Yoshida 26

3D TRACKING

  HIT  Fibers of maximum light yield FITTING  Circular fitting #1 2005/10/24 #2 #3 MICE CM at RAL, KEK test beam, Makoto Yoshida #4

BEAM

27

RECONSTRUCTED EVENT

RUN# 1320 B=1T , Rotation=6deg., w/o diffuser

2005/10/24 240 MeV/c p by TOF MICE CM at RAL, KEK test beam, Makoto Yoshida 28

    

Summary

KEK-PS T585 has been performed successfully by world-wide collaboration, to check basic property of the SciFi tracker in 1-Tesla magnetic field.

Integrated DAQ for beam counters and 2048 ch VLPC readout works well  but slow ~50Hz …  will need event buffering in MICE 4-Station SciFi tracker prototype works well   Successful tracking in magnetic field !

light yield is under estimate The information of T585 has been collected in the web page    http://133.1.141.121/~yoshida/MICE/T585/index.html

geometry, run summary table, DAQ, fiber mapping, VLPC LED calibration and analysis many thanks to A. Horikoshi to provide geometry information, LED calibration results, run summary and so on.

Detailed analysis is underway  Analysis based on G4MICE will be performed.

MICE CM at RAL, KEK test beam, Makoto Yoshida 2005/10/24 29

Thank you, all participants !

2005/10/24 MICE CM at RAL, KEK test beam, Makoto Yoshida 30