Cap bianchin
-
Upload
sebastien-bianchin -
Category
Documents
-
view
101 -
download
0
Transcript of Cap bianchin
Congrès de l'ACP / CAP Congress
Dr. Sébastien Bianchin (TRIUMF / UBC)
Development of an Active Kaon Stopping Target for the TREK-E36 Experiment at
J-PARC
29 Mai 2013 / May 29, 2013
S. Bianchin CAP Congress (May 27 - 31, 2013) 2
The TREK-E36 Experiment
The TREK-E36 Experiment at J-PARC is dedicated to the search for lepton flavor universality violation in Γ(Ke2)/Γ(Kµ2)
Talk by Prof. M. Hasinoff R2-7-4 (Thurday, May 30)
Precise measurement of the decay width ratio: RK = Γ(Ke2) / Γ(Kµ2)
E36 Goal : δRK/RK = ± 0.2% (stat.) ± 0.15% (syst.) [0.25% total]
S. Bianchin CAP Congress (May 27 - 31, 2013)
Active Polarimeter(JAPAN)
New Fiber Target(CANADA)
GEM Dectectors(USA)
CsI(Tl) readout (RUSSIA)
End View Side View
The TREK Experimental Apparatus
3
S. Bianchin CAP Congress (May 27 - 31, 2013)
18 Fibres (~6cm)
The TREK Scintillating Fiber Target
● 256 Fibers (3.2 x 3.2 x 200 mm3)
● Tested (Nov. 2012), labelled and ready to be assembled
● 1mm groove + green WLS fiber glued
● Assembly starts in May 2013 (K. Chang)
4
S. Bianchin CAP Congress (May 27 - 31, 2013) 4
18 Fibres (~6cm)
The TREK Scintillating Fiber Target
● 256 Fibers (3.2 x 3.2 x 200 mm3)
● Tested (Nov. 2012), labelled and ready to be assembled
● 1mm groove + green WLS fiber glued
● Assembly starts in May 2013 (K. Chang)
S. Bianchin CAP Congress (May 27 - 31, 2013)
Production of the TREK Fibers
5
1. A 1mm wide groove is cut along the 20cm long scintillating fiber
S. Bianchin CAP Congress (May 27 - 31, 2013)
Production of the TREK Fibers
5
1. A 1mm wide groove is cut along the 20cm long scintillating fiber
2. An optical glue is carefully deposited inside the groove
S. Bianchin CAP Congress (May 27 - 31, 2013)
Production of the TREK Fibers
5
1. A 1mm wide groove is cut along the 20cm long scintillating fiber
2. An optical glue is carefully deposited inside the groove
3. A green WLS fiber is pushed inside the groove and let to rest for 24h so that the optical glue hardens
S. Bianchin CAP Congress (May 27 - 31, 2013)
Production of the TREK Fibers
5
1. A 1mm wide groove is cut along the 20cm long scintillating fiber
2. An optical glue is carefully deposited inside the groove
3. A green WLS fiber is pushed inside the groove and let to rest for 24h so that the optical glue hardens
4. A plastic coupler is glued at the other end of the green WLS fiber
S. Bianchin CAP Congress (May 27 - 31, 2013)
Fibers are held together by stepped acrylic pieces and 1mm-thick Aluminium rings
7mm clearance to Aerogel Tube
Aerogel Tube : ID 79mm OD 85mm
Target Tube : ID 57mm OD 65mm
6
The TREK Scintillating Fiber Target
Side View
Acrylic pieces at both ends of the target
S. Bianchin CAP Congress (May 27 - 31, 2013)
● MPPCs (S10362-11-50C)● 1 x 1 mm2 sensor● 400 Pixels (50x50 µm2)● Gain: 7.5x105
● Better efficiency at low temperatures (0-5°C)
● ~450 MMPCs have been tested (Nov. 2012)
7
The MMPC Readout
S. Bianchin CAP Congress (May 27 - 31, 2013)
The Complete Setup (Concept)
8
Target OUT
Target IN
Temporary Support
S. Bianchin CAP Congress (May 27 - 31, 2013) 8
The Complete Setup (Concept)
Target IN
S. Bianchin CAP Congress (May 27 - 31, 2013)
The TREK Dark Box
Made of G10 (light tight)
568
mm
568
mm
The green WLS fibers are installed through a slot in the Dark Box upstream plate
9
S. Bianchin CAP Congress (May 27 - 31, 2013)
The EASIROC Board
● 32-channel I/O
● DSP / FPGA
● ADC (HG and LG)
● Multi Hit TDC (LE and TE)
8x 32 channel (or 4 x 64) EASIROC boards are needed to read out the 256 channels (full target)
Designed and made in Japan
Tested at TRIUMF
A new 64 channel EASIROC board is currently being designed and
should be ready for tests in 2014 !
10
S. Bianchin CAP Congress (May 27 - 31, 2013)
Beam Tests & Preliminary ResultsTests performed at TRIUMF (Nov. 2012)
11
S. Bianchin CAP Congress (May 27 - 31, 2013)
Beam Tests & Preliminary ResultsTests performed at TRIUMF (Nov. 2012)
11
S. Bianchin CAP Congress (May 27 - 31, 2013)
A Look Inside de Box
32 (8x4) Fiber Bundle (~24x12mm2)
Hit in perpendicular AND parallel directions
12
S. Bianchin CAP Congress (May 27 - 31, 2013)
A Look Inside de Box
32 green WLS fibers coupled to 32 MPPCs
13
S. Bianchin CAP Congress (May 27 - 31, 2013)
Preliminary Results : ADC Spectra
14
EA
SIR
OC
Bo
ard
#1
EA
SIR
OC
Bo
ard
#2
Missing Channels (#14 & #28)
S. Bianchin CAP Congress (May 27 - 31, 2013)
Temperature dependence of ADC Gain
15
S. Bianchin CAP Congress (May 27 - 31, 2013)
Temperature dependence of ADC Gain
15
S. Bianchin CAP Congress (May 27 - 31, 2013)
Temperature dependence of ADC Gain
15
S. Bianchin CAP Congress (May 27 - 31, 2013)
Temperature dependence of ADC Gain
16
courtesy of F. Retière
∆x = -22.95T + 362.6
S. Bianchin CAP Congress (May 27 - 31, 2013) 17
1 pe ~12.5 pe
Dark Curent Analysis
Average Energy Deposit through 3mm of plastic 0.6 MeV
~21 pe/MeV
ped
1 pe
2 pe
MPPC noise spectrum showing the photo-electron separation
3 pe
Energy spectrum for penetrating cosmic rays passing through 1 bar
S. Bianchin CAP Congress (May 27 - 31, 2013)
Preliminary Results : Particle Tracking
beam
beam
EA
SIR
OC
Bo
ard
#1
EA
SIR
OC
Bo
ard
#1
18
S. Bianchin CAP Congress (May 27 - 31, 2013)
Preliminary Results : Particle Tracking
19
beam
beam
EA
SIR
OC
Bo
ard
#2
EA
SIR
OC
Bo
ard
#2
S. Bianchin CAP Congress (May 27 - 31, 2013)
beam
beam
EA
SIR
OC
Bo
ard
#2
EA
SIR
OC
Bo
ard
#2
Preliminary Results : Particle Tracking
19
S. Bianchin CAP Congress (May 27 - 31, 2013)
Tracking Algorithm
We built a set of 20 “perfect” tracks in
a 64 fiber bundle
and
tested our tracking algorithm
Prelim
inary
20
S. Bianchin CAP Congress (May 27 - 31, 2013)
Tracking Algorithm
Prelim
inary
We are now working on a better version of our tracking algorithm capable of finding the particle tracks for MC simulated events and later on for real data collected during our beam tests
21
courtesy of D. Gill
S. Bianchin CAP Congress (May 27 - 31, 2013)
The TREK Collaboration
22