comparisons of scintillating fiber, diamond particle
TRANSCRIPT
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 ?