Laser Stabilization Controls for the ISAC Beam Polarizer

Details Laser Stabilization Controls for the ISAC Beam Polarizer Laser Stabilization Controls for the ISAC Beam Polarizer

2001-11-10

arxiv.org/abs/physics/0111081v1

eConf C011127 (2001) THAP065

Physics

Accelerator Physics

ICALEPS01 TUAP065

Scientific paper

The ISAC polarized beam facility uses a Ti:Sapphire laser for producing spin-polarized beams of short-lived radioactive isotopes, initially 7Li. The laser power and spectral content must be tightly controlled and monitored. The control system to accomplish this task uses techniques that combine operator interface, data reduction, and closed loop automation. The laser stabilization application uses input data acquired from a spectrum analyzer, in the form of a waveform array repetitively acquired from a GPIB-interfaced oscilloscope. A Labview based operator interface allows the selection of features from within the waveform, which are then used as the basis for closed loop control, in concert with the existing EPICS control system software and related hardware. Part of the challenge stems from using input data which are subject to human interpretation and require distillation into a hard numeric format suitable for use in a control system.

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