kek beam test
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KEK beam test
H. Sakamoto
Purpose
To optimize a concentration of the second dopant for scintillating fibers KEK beam test to study light yields for various conc
entrations
Summary
Purpose for the beam tests
We tested the light with two difference tests to study the light yield with realistic components of 3HF concentration dependence
First time (T553-1): calibrated the gain of pmt with 1 p.e. Second (T553-2) : 〃 with more p.e. ( ~ 20p.e.)
T553 (this time) T542 (last year) SciFi length 40cm 20cm Mirror aluminized mirror aluminized mylar Connection MICE connector acryl board Clear fiber w/ and w/o 4m no PMT R7411U-40MOD R7899-MOD
Scintillating fibers tested
Kuraray SCSF-3HF ; 0.35mm-phi, multi-clad, s-type In this beam test, pT(2%) scifi was also tested.
pT(1%) + 3HF(5000ppm) pT(2%) + 3HF(5000ppm) pT(1%) + 3HF(3500ppm) pT(1%) + 3HF(2500ppm) pT(1%) + 3HF(4500ppm) pT(1%) + 3HF(7500ppm) pT(1%) + 3HF(10000ppm) pT(2%) + 3HF(10000ppm)
Attaching SciFi with MICE conn.
Attached the SciFi and clear fibers with MICE conn. Clear fibers for pmt’s gain calibration
Clear fiber (1.05mmΦ)
SciFi (0.35mmΦ): 14fibers
SciFi
Clear fib
Scintillating fiber
• Connecting the SciFi into the hole of MICE connector
Fixing by optical cement
• Fixed the SciFi with optical cement
Q.E. of VLPC & 3HF emission spectrum
3HF emission spectrum
520nm
Quantum efficiency of VLPC
520nm
Quantum efficiency
VLPC vs PMT QE
01020304050607080
200 300 400 500 600 700 800
Wavelength [nm]
Quan
tum
Efficie
ncy [
%]
00.020.040.060.080.10.120.140.16
PMTQE [%]VLPCQE [%]ZD43233HF
Photo multiplier tube
We used the photo multiplier tube instead of VLPC.
Hamamatsu R7411U-40MOD GaAsP (Gallium-Arsenic-Phosphorous) 8mm diameter 10 stage Head-on Type HV= -850V
Set up T542 (last year)
•Side view
PMTSci-Fi
Aluminized tape
22mm
20 fibers
These were in a dark box
•Front view
PMTSci-fi
KEK beam test set up Ⅰ
D1 TOF2D2Sci-Fi
Trigger coincidence of all counters
Data we took ADC & TDC of all counters and Sci-Fi
1.5m4m
•0.6 GeV/c•1.2 Gev/c
TOF2 Sci-Fi TOF1D1
Dark box
D2
• p+ •π+
Beam
D3
Set up (T553) Beam area
Dark box
Set up (T553)
In the dark box
D1D2 SciFi and support
Setup (T553)
mirrorpmt
SciFi
•SciFi and its support gide before setting in the dark box
Aluminized mirror
SciFi
Mirror
PMT (R7411U-40MOD)
SciFi
PMT
Close up of SciFi 14 fibers were arranged into 420um bitch
Arrangement of Scifi
For single layer : 14 fibers
For double layer : 3 fibers for up and 4 for down
420um
T553-1 (first test) Gain calibration -1
calibrated the PMT’s gain by 1 p.e. Injected the LED light adjusted as 1 p.e. to the cathode surface of the PMT.
1 p.e. was determined with the ratio of 0 p.e. and 1 p.e.
But this measurements was not worked Not good S/N To the second test with higher p.e.#
The result : Light yield
T553-1 (first time)
These are not p.e. but the relative values are meaningful. 5000ppm has the highest light yield in tested fibers.
1. 5000 -1%2. 4500 -1%3. 10000 -1%4. 2500 -1%5. 5000 -2%6. 3500 -1%7. 7500 -1%8. 10000 -2%
T553-2 (second test)
Gain calibtion -2 Adjusted the LED to
about 20 p.e. P.e.# was estimated
by ((MEAN)/(RM
S))^2
Beam stability
Stability of beam momentum by Time of flight of 0.6 (Gev/c) proton
Monte Carlo
•Simulated 1.2 (GeV/c) data for proton and pion• Histgram (red) = MC • Plot w/ err = data
Pion
Proton
Result of light yield
P.e.# (estimated by MC)
Light yield of 5000ppm-(1%)
•Light yield (5000-1%) = 8 p.e. @MIP
Result of light yield Light yield of 2500ppm-(1%)
P.e.# (estimated by MC)
• Light yield (2500-1%) = 6.5 p.e. @MIP
The result
•Single layer && 4m clear fiber
5000ppm-1% 2500ppm-1%
The result
•Double layer && NO clear fiber
5000ppm-1% 2500ppm-1%
The result
•Double layer && 4m clear fiber
5000ppm-1% 2500ppm-1%
Conclusion from the beam test
We tested scintillating fibers of different 3HF concentration.
We used green sensitive PMTs in stead of VLPC.
The result of light yield test Single layer
5000ppm-1% : 8 p.e. (3 p.e.) 2500ppm -1%: 6.5 p.e. (3 p.e.)
Double layer 5000ppm-1%: 10 p.e (4.5 p.e.) 2500ppm-1%: 8 p.e. (4.5 p.e.)
Summary
We studied the light yield of scintillation fibers mixed with 3HF as a secondary dopant with realistic component .
We studied the light yield with some conditions. w/ and w/o 4m clear fiber Single and double layer
The result of light yield pT(1%) + 3HF(5000ppm) has the highest light yield in any conditions.
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