Compton Experiment at ATF Compton Meeting at LAL Orsey 2-Dec-2008 Tsunehiko OMORI (KEK) with many...
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Transcript of Compton Experiment at ATF Compton Meeting at LAL Orsey 2-Dec-2008 Tsunehiko OMORI (KEK) with many...
![Page 1: Compton Experiment at ATF Compton Meeting at LAL Orsey 2-Dec-2008 Tsunehiko OMORI (KEK) with many thanks to Compton collaborators.](https://reader035.fdocuments.in/reader035/viewer/2022062409/5697bff71a28abf838cbe9c6/html5/thumbnails/1.jpg)
Compton Experiment at ATF
Compton Meeting at LAL Orsey 2-Dec-2008
Tsunehiko OMORI (KEK)with many thanks to Compton collaborators
![Page 2: Compton Experiment at ATF Compton Meeting at LAL Orsey 2-Dec-2008 Tsunehiko OMORI (KEK) with many thanks to Compton collaborators.](https://reader035.fdocuments.in/reader035/viewer/2022062409/5697bff71a28abf838cbe9c6/html5/thumbnails/2.jpg)
Experimental R/D in ATF
.
Make a fist prototype 2-mirror cavity
Put it in ATF ring
Hiroshima-Waseda-Kyoto-IHEP-KEK
Lcav = 420 mm
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Laser Stacking Optical Cavity in Vacuum Chamber
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Summer 2007: Assembling the Optical Cavity
![Page 5: Compton Experiment at ATF Compton Meeting at LAL Orsey 2-Dec-2008 Tsunehiko OMORI (KEK) with many thanks to Compton collaborators.](https://reader035.fdocuments.in/reader035/viewer/2022062409/5697bff71a28abf838cbe9c6/html5/thumbnails/5.jpg)
October 2007: Install the 2-mirror cavity into ATF-DR
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Before Summer
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DAQ Schematic
Continued to change the length of the external cavity.
Only picked up the data when the cavity was resonated.
2.16MHz
- e
cavity
Could pass Comparator
Gate was opened
for 100ns.
T = 463ns
PD
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The appearance of light resonance signal
Reflected light
Transmitted light
In this time, the optical cavity was resonated state
Transmitted light
Mirror reflectivity : 99.6%
Mode locked laser
(Photo diode)
PD
time (ms)
Continued to change the length of the external cavity.1ms
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Gamma Energy distribution 2
This graph shows the appearance of gamma energy distribution.
one of gamma had 16~28 MeV energy.
1 gamma
2 gamma
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The number of gamma
1 bunch : experiment ~3.3 simulated by CAIN ~ 4.5
20 bunches : experiment ~3.1 simulated by CAIN ~ 20
In the case of 1 bunch, the number of gamma seems to consist comparing our experiment data with estimate by CAIN.
However, the data of 20bunches were inconsistent.The reason of this,there was a possibility that not every electron bunches were collided.
We estimated the number of gamma to use a simulation software “CAIN”.
bunch distance : 2.8 ns
date bunch the number of electron transmitted power stack power estimate É¡1/pulse (included in one train) W W
2008/4/22 20 2.6E+10 (in 20 bunches) 1.55 388 3.12008/5/27 1 7.2E+9 (in 1 bunch) 1.09 272 3.27
Mirror reflectivity : 99.6%1 - 0.996
transmitted powerstack power =
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Present Status
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Lcav = n Lcav = m Llaser
Laser freq = Ring RF
Feedback to Achieve 3 Conditions
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PID HVPhaseDetector
RingRF
HV
BPF
BPF
DC +
keep resonance
PID
sync. to Acc.
Piezo
Piezo
PD
Ref-lightStacking
Cavity
Laser
laser lightpulses
offset
Normal Solution
QPD
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DC +
PhaseDetectorBPF
BPF
Piezo
Piezo
PD
Ref-lightStacking
Cavity
Laser
PID HV
QPD
PID HVRingRF
keep resonance
sync. to Acc.laser light
pulses
offset
(Sakaue)Cross-feedback Solution
offset
![Page 15: Compton Experiment at ATF Compton Meeting at LAL Orsey 2-Dec-2008 Tsunehiko OMORI (KEK) with many thanks to Compton collaborators.](https://reader035.fdocuments.in/reader035/viewer/2022062409/5697bff71a28abf838cbe9c6/html5/thumbnails/15.jpg)
PID HVPhaseDetector
RingRF
HV
BPF
BPF
DC +
keep resonance
PID
sync. to Acc.
Piezo
Piezo
PD
Ref-lightStacking
Cavity
Laser
laser lightpulses
offset
Normal Solution
QPD
can be SLOW
must be FAST
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PID HVPhaseDetector
RingRF
HV
BPF
BPF
DC +
keep resonance
PID
sync. to Acc.
small mirror
FAST
large mirror
SLOW
Piezo
Piezo
PD
Ref-lightStacking
Cavity
Laser
laser lightpulses
offset
Normal Solution
QPD
can be SLOW
must be FAST
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DC +
PhaseDetectorBPF
BPF
Piezo
Piezo
PD
Ref-lightStacking
Cavity
Laser
PID HV
QPD
PID HVRingRF
keep resonance
sync. to Acc.laser light
pulses
offset
(Sakaue)Cross-feedback Solution
offset
can be SLOW
must be FA
ST
small mirror
FAST
large mirror
SLOW
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Optical cavity condition
In summer time, we succeeded to keep condition of optical cavity timing lock and locking at resonance point.
Last week beam time, Optical cavity was to keep condition timing lock and locking at resonance point.
Transmitted light
Locking at resonance
Timing
locked Timing
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Energy Distribution single-bunch operation
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Best collision point data in 1 bunch and 2 bunches
1 bunch 2 bunches
Scanning to Horizontal position Scanning to Timing
After that, we tried to take 3 bunches data.
However, gamma detector was broken.
Now, gamma detector is recovered.
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Rough consistency check
÷ the number of electron ÷ stack power
1 bunch 1.715×10E+8
2 bunches
1 bunch data and 2 bunches data seem to consistent
This weekWe try 10-bunch and 20-bunch operation
The number of : 6.2 × 2.16×10E+6 [1/second]
date run # electron the number of electron stack power estimate posipol bunch(es) / pulse bytrans[W] / crossing
/ -5 .E+9 43 5./ - .4E+ 9 6.
Simulated by Cain 1bunch : 5.7 2 bunches :6.7
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Summary
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Summary1. Success : Resonance Feedback + Phase Lock on Acc RF
Before Summer No feedback Trigger : Acc + Transmitted LightPresent Normal Feedback ---> Cross-feedback Resonance Feedback + Phase Lock on ACC RF Trigger : Acc
2. Collision Experiment on going 5 gamma / crossing (single-bunch op.) 6 gamma / crossing (two-bunch op.) Consistent: Experiment <--> CAIN simulation Consistent: single-bunch <--> two-bunch This week : collision in 10-bunch and 20-bunch op.