9:33 Start warming up

9:45 Ducre is working on the plumbing but it shuld not affect operations

11:00 Intervention JNC pour problemes refroidissement

12:00 Start beam

12:30 Sweeping of frequencies on RF cavity in ring, found local maxima at:

-500.0441MHz

-500.0371MHz

-500.0186MHz

Ring optimisation at 500.0186MHz

Slits position: 10mm/31.5mm (no improvement) => removed

16:30 Beam stop (access by Ducre)

Modulator left on standby, laser Gated, Magnets ON

Summary of the search:

Recipe used: all_20230516_15_45_01 (LI+TL+RI, all_recipes)

Attached plot shows ring at f=500.0202MHz.

RF Cavity: 45kV, fundamental = 114276mm; Plunger 15.420mm.

We ramped the cavity up to 50kV. Going from 40kV to 50 kV decreases orbit quality => some parameters still to be optimised.

Effect seen for:

RI/PS/DP: +/- 1A kills the beam. Changes by 0.1A can improve the beam.

RF cavity phase: acceptable values are on a wide range (-20degrees => +40 degrees) still very wide. We should probably set the cavity around +10 degrees (center of the range) begore increasing the voltage

RF Frequency: we had more than 100 turns in a band of about 10kHz

No effect seeing for:

injection steerers (no change in stored beam orbit)

Suggestion:

Try to optimise the quadrupoles with current settings

Then optimise the RF cavity phase (check that manual changes and software changes have similar effects) and ramp slowly the voltage.