Studies of Small Scintillating Cells with Modified Geometries
Comparisons of Scintillating Fiber, Diamond Particle ...
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Comparisons of Scintillating Fiber, Diamond Particle Detector and Beam Current Transformer T. Tsang BNL (Nov 24, 2009)
Transcript of Comparisons of Scintillating Fiber, Diamond Particle ...
Comparisons of Scintillating Fiber, Diamond Particle Detector
and Beam Current TransformerT. Tsang
BNL(Nov 24, 2009)
Scintillating fiber channel #0
2 meter long, BCF-20, 1-mm diameterblue emitting scintillating fiber
12 meter long, 1-mm diameterBFH37-1000 fiber, blue T=0.77
Avalanche photodiode
һγ
plastic scintillating fiberSaint-Gobain BCF-201/e length >3.5 meterfluorescence decay time ~ 2.5 ns~8000 photons/Mev
Feb. 6, 2008
scintillating fiber
typical signal traceshot # 17020
8 bunches6 TP
Diamond particle detector
Shot # 17017 Shot # 17006
typical diamond detector signal trace
from Marcus Palm
Nov. 11, 2007, 17000 series dataRed: x, diamond particle detector signal @ left 20o
Black: y, scintillator detector signal
0.94
0.90
0.87
0.47
0.93
0.56
0.83
0.97
0.95
0.89
0.95
0.92
Nov 4 2009Correlation of Scintillator & Diamond Particle detector signalcalculated correlation
of peak height(data smoothed with 3 or 5 pts)
nanosecond
P&S
typical transformer signal tracetransformer.zip – higher resolution dataRawTransformerData.tgz – lower resolution data
Beam current transformer summary.xlsappear to be a file for adjusting the baseline shift
Nov. 11, 2007, 17000 series data
Red: x, diamond particle detector signal @ left 20o
Black: y, scintillator detector signalBlue: z, current transformer signal
Nov 13 2009Correlation of Scintillator & Diamond Detector & Current Transformer Signalscalculated correlation
of peak height(data smoothed with 3 or 5 pts)
nanosecond0.92
0.88
P&S P&T
0.95
0.93
0.89
0.89
0.95
0.95
0.97
0.92
0.83
0.81
0.56
0.53
0.47
0.24
0.87
0.74
0.90
0.88
0.94
0.93
0.93
0.78
Probe
Nov. 11, 2007, 17000 series data
Red: x, diamond particle detector signal @ left 20o
Black: y, scintillator detector signalBlue: z, current transformer signal
0.063
0.95
0.88
Nov 18 2009Correlation of Scintillator & diamond Particle & current Transformer signalpump-probe studies
calculated correlationof peak height
(data smoothed with 3 or 5 pts)
P&S P&TPump
nanosecond
0.39
0.92
0.87 0.92
-500 V
-
+
GND
pCVD
100
nF
1 kΩ
1 MΩ
50 Ω
term
.o
n o
scill
osco
pe
0 Ω
0 Ω
Marcus Palm’s diagram
Actual diagram
back
front
0.5x7.5x7.5 mm3
Au padding 0.5 µm thick
Details of diamond particle detectorNov. 6, 2009
From MPalm_AB_note.pdf
guard ring
electrode
Response of diamond particle detector usingα injection 241Am @ 5.5 MeV241Am place in the front – hole draft induced 241Am place in the back - electron drift induced
Nov. 6, 2009
0.5 mm thick pCVDElectron saturation velocity: 2.3 x 105 m/s → 2.2 ns pulse responseHole saturation velocity: 1 x 105 m/s → 5.0 ns pulse responsecontradicting our result here !
Response of diamond particle detector using 193 nm ArF laser
laser illumination location
Response of diamond particle detector using x-ray injection @ NSLS-X15A (19 keV)
Nov. 19, 2009
NSLS parametersBunch frequency: 52.88 MHzBunch spacing: ~19 nsBunch length: 287 psx-ray beam size: 0.2x0.2 mm2
Measured resultsTransmittance of Au pad: 0.92Absorption of diamond: 0.0672Typical photocurrent (ave): ~nADiamond responsitivity: 0.00464 A/W
detector response map
x-ray injection
diamond detector response
drooping ?
To be examined on other (more intense) x-ray beamlinesthe drooping effect of diamond detector, if any
x-ray injected on the back
response is fairly uniform
No drooping ?
