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.xls appear 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 correlation of 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 M

Ω

50 Ω

ter

m.

on 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 ?