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

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35013.07.2011: Turn2 window 500 ps, Measurements along pulse train

Streak time scale (ps)

Inte

nsity

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60013.07.2011: Turn3 window 500 ps, Measurements along pulse train

Streak time scale (ps)

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nsity

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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)

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nsity

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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)

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ch le

ngth

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HM

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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