Some notes on tasks to tackle before sending the full power beam into the tunnel.
Also some ideas on first tests for when we ramp up the laser.
Before full power operation
- Check permanent and variable filtering (flippies) for cameras in laser room – Laser cameras and alignment references
- Check permanent and variable filtering (flippies) for cameras in tunnel – Laser cameras and alignment references
- Determine safe set of motor positions for everything in the PB – Motor positions
- Fix hole size for laser shutter enclosures
- Write up procedure/check list
- Find an reliable energy controlling method:
- Use wave plate + thin film polarizatior. This will have to test the minimum achievable energy using such combination (ideally <10mJ), and test the damage threshold of the polarizor
- Measure change in collimation as function of pump delay (SAGA attenuation, WP+thin film polariser?)? – or come up with strategy to enable slow ramp up of energy without RP attenuator
- Figure out how to send beam at lower repetition rate
- Fix the panels for laser shutter - a high power beam with diffraction profile may cause some harzard to the gratings
During ramp up
- Attenuate laser and gradually ramp up
- Check light levels on all cameras, look out for abnormalities that indicate damage
- Check vacuum levels as beam is dumped on compressor block
- Check vacuum levels as beam is dumped on laser beam dump in PB
- Check for damage, signs of ablation etc. around compressor block and laser beam dump in PB
- Check if scaling on laser diagnostics matches expected energy scaling (for on-shot energy measurement)
After initial ramp up
- Check optics and cameras for damage