present: Edu Granados, Aurélien Martens, Peter Kruyt, Fred Galleazi, Davide Gamba, Anthony Harrison, Wiesek Placez, Dima Budker
Presentation by Aurelien, reporting on :
- the test of NeoLase amplifier at Orsay in September. Conclusion: good enough provided that flow rate of chiller is under control.
- 700kW result with 2 mirror optical cavity. Validates the fluence on mirror for GammaFactory. Accepted for publication in Optics Letters. Submitted as PBC-Note.
- Flooding at Orsay, impacts the optical rooms of the IJCLab team involved in GammaFactory. No clear planning to recover the electricity.
- Next step : test of pulse picking scheme, procurements and addendum no2.
Edu commented that procurements are on track: all elements received, amplifier tender will be published within a month. Addendum is in the hand of legal service. He reported alors that pillar in installed in NA of SPS currently and will be installed on 20th-21rst Jan in SPS tunnel close to TI18 area. ECR was approved. Anthony Harrison and Eduardo Granados exchanged on the steps for this installation to happen smoothly. In particular an unused control box from Vacuum will be removed. Some other elements will be temporarily moved for the installation to happen. Stability tests will happen during next YETS or beginning of LS3. Beamline vacuum lines will need to be designed, target is currently installation in the end of LS3.
Discussion also occurred on the final cavity design. Davide and Peter mentionned that required tuning ranges of a couple of mm are needed to tune overlap (including tuning of cooling) while outcome of the machine study realized by Rebecca concluded that only one mm can be obtained for the beam position tuning from the existing steerers. Possibility to move the laser has been mentionned. Aurelien commented that it was not initially planned since it requires moving a heavy table. Conclusion is that a more detailed beam tuning study is needed to conclude on the requirements to finalise the design of the interaction region. Need to anyway steer the laser to the cavity has also been mentionned by Eduardo, which implies relevant diagnostics on the beam line and possibly on the cavity girder.
