The Design of Beam Profile Monitor and the test at SRRC
description
Transcript of The Design of Beam Profile Monitor and the test at SRRC
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For the FLASH Collaboration
by Taiwan CosPA Members W-Y.Pauchy Hwang, Guey-Lin Lin,
Ming-Heuy Huang, Chien-Wen Chen, Feng-Yin Chang, Chih-Ching Chen, Yu-Chung Chen,
Staff Member :Maggie Wang
The Design of Beam Profile Monitor and the test at SRRC
Chien-Wen Chen
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PC2
WINDOWS XP
(LAPTOP)
CAMERA PC1
WINDOWS XP
(WORKSTATION)
SLAC
TRIGGER
SYSTEM
TUNNEL CONTROL ROOM
LAN
CAMERA CONTROL, IMAGE DOWNLOAD, DATA ANALYSE
MONITORING, REMOTE CONTROL
TRANSFER DATA OF & POSITION
TITANIUM FOIL
DESIGN OF BEAM PROFILE MONITOR
ELECTRON BEAM
HUMAN
@ @
,, yx
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total 64cm
object distance 35cm
29cm
Trigger circuit
tubelens
CCD IEEE 1394
titanic foil
beam
pipe
six way
cube
beam
axis
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16cm
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7cm (inner)
8cm (outer)
screw holes
1.3cm
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2 ft
2 ft optical
table
Cab
le tr
ay/W
all
6 inch beam pipe
e-
25 inches (wall-to-wall)~ 63.5 cm
OTR“cube”
28 inches (wall-to-beam-axis)
Top view – not to scale
Beam lineflange.
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Pixels 1360x 1036
Well size 10000 e
Pixel size 4.65x
4.65
Digital output
8/12 Bit
Readout noise
9 e
Dark current 1.3/pix/s
Cooling 25C below ambient
Integration
time
Ambient operating temperature
0 to 35C
m
min 15
tos40
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340
440
200
200
10
ROI
Full Frame
Spot
3x3 binning 1mm
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222
2
2 )(
dddN
))33(1040(3.1(9)1065.43/()/(()()(9.09.0)(2
)(
)6
2622
abdQOdrrrfN
braNoiseSignal
ba
1
1,
OTR efficiency
transmission efficiency
quantum efficiency
pixels
readout noise
dark current
distribution# of electrons
OTR efficiency and angular distribution of a single electron for a metal foil:
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The Algorithm
Integrating over one axis
200
200 200
x
i
ii
i
i
N
xxNxx
22
< x >
)2
2(
2
2
2
)(
x
xx
x
dxex
x x
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center σ
10^7 95 59
10^9 9500 5870
)587(x
)950(CenterIn SLAC
30GeV
10^8 e/bunch
Maximum intensity can be analysed
:1.05x10^9 e/bunch
1mm YX
Signals per Pixel
Plotted by Feng-Yin
pixel
phot
oele
ctro
n
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max σ
10^7 2550 1577
10^9 254980 157700
)15770(x
)25498(Center
1mm YX
In SLAC
30GeV
10^8 e/bunch
Signal
(Integrating over One Axis)
phot
oele
ctro
n
pixel
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max σ
10^7 9 5
10^9 927 468
phot
oele
ctro
n)47(
x
pixel
Center(93)
In SLAC
30GeV
10^8 e/bunch
1mm YX
Signal to Noise Ratio per Pixel
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)183(Center
center σ
10^7 18.3 11.3
10^9 1830 1130
In SLAC
30GeV
10^8 e/bunch
1mm YX
)113(x
phot
oele
ctro
n
pixel
Signal to Noise Ratio
(Integrating over One Axis)
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trigger exposure readout download
the image
analyse transfer
download the
analysed data
s65 s40
360GB / 80KB = 4.5x10^6 (events)
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BPM
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aluminum
coating mirror
beam pipe
stainless
window
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Data captured in SRRC
pixelsx 1.93
Signals =
450457 photoelectrons
σx= 1.22 mm
bunche /106.5 7
1.5 GeV
phot
oele
ctro
n
pixel
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Theoretical calculation in SRRC
1.5 GeV7106.5 e/bunch
Total photoelectrons
=256389
)9727(Center
phot
oele
ctro
n (5908)x
pixel
σx= 1.22 mm
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Experimental : 450457 photoelectrons
Theoretical : 256389 photoelectrons
phot
oele
ctro
n
(one metal surface)
(two metal surface)
450457 / 256389 = 1.757
Factors which may had made the difference: twice OTR, instability of the current, interference of the twice OTR.
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Conclusions
1.We have captured and downloaded the image
of OTR at SRRC.
2.The S/N ratio seems to be big enough, so that
we may sacrifice some of it to increase the
MAX intensity of events which can be analysed .
3. The code to analyse and transfer data is yet to
be accomplished.