Late Saturday Shift 2/3 go to 350 kV. If there is something wrong,
Heat cleaning on Monday.
Activation on Tuesday.
No problems at 250 kV
Halo - overheating of the cathode? Diffusion of arsenic to the surface of the cathode causing scattering of the incoming laser light rather than reflection through the anode.
Tasks:
Highest Q available
Emittance measurement? No sensible results possible with the halo. For example, a pepperpot measurement revealed a lot of strange images.
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