CTF3 Streak CameraResults and Improvements
Aurélie Rabiller BE-BI-PM09.02.2012
CTF3 streak camera - February 2012 2
Summary
• 2011 Measurements in CR, DL and CLEX
• Optical lines improvements
• Streak camera operation
• Discussion
CTF3 streak camera - February 2012 3
Streak camera optical lines
OTR light sourcesSynchrotron light sources
DL lab
CLEX lab CR lab
CTF3 streak camera - February 2012 4
2011 MeasurementsCombiner ring: Bunch length stability and bunch spacing
Bunch length: 200 ps window Turn 1 to Turn 4 (10.06.2011)
Very few measurements this year due to the difficulties to operate the beam+Misalignment of the optical line
250 300 350 400 450 500-50
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35013.07.2011: Turn2 window 500 ps, Measurements along pulse train
Streak time scale (ps)
Inte
nsity
(-)
150 200 250 300 350 400 450 500-100
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60013.07.2011: Turn3 window 500 ps, Measurements along pulse train
Streak time scale (ps)
Inte
nsity
(-)
Multi-turn bunch length stability (July)
Bunch Spacing (July)
Bunch spacing : 500 ps window Turn2 and 3 (13.07.2011)
CTF3 streak camera - February 2012 5
CLEX: bunch length and bunch spacing
Bunch length and bunch spacing along the train (July)
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800013.07.2011: 25 ps/mm, Measurements along pulse train
Streak time scale (ps)
Inte
nsity
(-)
0 20 40 60 80 100 120 140 160 180 20070
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10013.07.2011: 25 ps/mm, Measurements along pulse train
Time (ns)
Bun
ch s
paci
ng (p
s)
bunches 1-2bunches 2-3bunches 3-4bunches 4-5
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4013.07.2011: 25 ps/mm, Measurements along pulse train
Time (ns)
Bun
ch le
ngth
FW
HM
(ps)
bunch 1
bunch 2
bunch 3
bunch 4
bunch 5
Bunch length and bunch spacing along train: 25 ps/mm speed
2011 Measurements
First measurements with the line done successfullyNeed more beam time to finish commissioning
CTF3 streak camera - February 2012 6
Optical lines improvementsCombiner ring: re-alignment of the lines => next week
Delay Loop: re-aligned last year, shoud be ready for measurements (No measurements last year due to difficulties to send the beam in DL)
CLEX:- addition of a light shielding => next month- replacement of the lens by an elliptical mirror => this year
Third streak camera equiped with readout camera => ready=> One streak camera for each lab
CTF3 streak camera - February 2012 7
Operation of the streak camerasGeneral procedure: • spot adjustment in focus mode (no sweep) : the spot should be centered
on the slit and as focused as possible• slit reduced to 0.2-0.4mm (depending of the spot size and the light
intensity)In Focus mode, the camera is really sensitive to light
• switch in sweep mode with the biggest time window (1ns) to find the train (trigger delays adjustment)
• Reduce step by step the time window with trigger and gain adjustment
For this procedure, the presence in the lab is required
CTF3 streak camera - February 2012 8
Old streaks:• Manual control of shutter, slopes and gain
=> For the operation of old streaks, presence in the lab required• no online values => data needed to be processed (Matlab or equivalent)
New streak:• automatic control of shutter, slopes and gain• online bunch length value provided• possibility to use cursors on the graphic window for rough bunch spacing
values• possibility to control the camera with LabView application
Operation of the streak cameras
CTF3 streak camera - February 2012 9
• Online processing of the data (Labview application or else)
• Remote control of the cameras
• ...
Discussion