PETRA Laserwire Experiment Review December 2003 Run - PowerPoint PPT Presentation

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PETRA Laserwire Experiment Review December 2003 Run

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Re-alignment of laser beam and installation of cameras (2h) ... Xmas party of MIN group. 7/29/09. T Kamps, BESSY FEL. 3. Boundary Conditions. PETRA setup ... – PowerPoint PPT presentation

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Title: PETRA Laserwire Experiment Review December 2003 Run


1
PETRA Laserwire ExperimentReview December 2003
Run
  • T Kamps

2
From the Logbook
  • 02 Dec
  • Re-alignment of laser beam and installation of
    cameras (2h)
  • Beam in PETRA at 7 GeV for the whole afternoon
  • Started by driving orbit bumps in order to find
    overlap (1h)
  • Stopped because of ADC trigger problems
  • 03 Dec
  • Replaced ADC card (morning)
  • Laser security interlock event (4h)
  • Stopped because of trigger problems with new ADC
  • 04 Dec
  • Everything is working but no beam in PETRA
    (morning)
  • Start with orbit bump and then piezo scanner
    (30min)
  • Low current scan with 7.1 mA (1h 30min)
  • High current scan with 40.1 mA (1h 30min)
  • 05 Dec
  • Detector tests with asymmetric orbit bumps
  • Xmas party of MIN group

3
Boundary Conditions
  • PETRA setup
  • Positron beam at 7 GeV
  • Bunch pattern 14 x 1 bunch evenly filled
  • Low current setup 7.1 mA, first bunch 0.458 mA
    (3.9 nC)
  • High current 40.5 mA, first bunch 2.686 mA (22.3
    nC)
  • Vertical and horizontal orbit bumps to steer
    positron beam into laser beam
  • Four steerers (max/min current 10A)
  • 50 m bump length with 10 mm max offset
  • Laser setup
  • Optimization of laser trigger point
  • Delay box with 0.5ns resolution
  • Laser energy measured in hut with attenuators
  • Energy/pulse 40 mJ (specs 90 mJ), PL 4 MW
  • Piezo Scanner setup
  • Move beam to offset position with orbit bump
  • Scan in 0.5V steps from 0V to 10V ( 2.5 mrad)
    and record 5000 trigger events at each step

4
Raw Data ADC Signal vs Event Number
5
Number of Events vs ADC Channel
6
Background - Number of Events vs ADC Channel
7
Peak Signal and Background
8
Positron Beam Orbit Stability
x -1.99 0.04 mm
y 3.16 0.04 mm
x -2.18 0.04 mm
y 3.15 0.04 mm
9
Results from Scanner Operation
  • Slopy Background Gaussian approximation of beam
    shape
  • sm (68 3 14) µm at low current
  • sm (80 6 16) µm at high current

10
Conclusions and Outlook
  • Understand low Compton rate
  • Laser characterisation (profile and power)
  • Study Compton path from IP to detector
  • Detector calibration
  • Geant4 simulations
  • Improve Compton rate
  • Background suppression with shielding
  • Improve trans. and long. laser profile

11
This Run
K Balewski, G Blair, S Boogert, G Boorman, T
Kamps, H C Lewin, F Poirier, S Schreiber, M
Wendt, K Wittenburg
  • Thanks to PETRA and BKR shift crews !
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