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Message ID: 772     Entry time: Fri Jun 16 09:36:07 2023
 Author: VK, IC. VM, AL, ND, LS 
 Status:  
 Type: Shift summary 
 Category: Ring Commissioning 
 Important:
 Subject: Orbit correction, optimization of the storage, study of the RF frequency 
 Icon:  

9h30 Start of the modulator and lasser (GATE is closed).

9h46 Data is taken as background.

Cavity is tuned to 500.38 MHz. Optimization of the energy and phase. 

RF cavity OFF. After previous tuning, the orbit is the same. Based on the simple calculation, to match to orbits, the RF frequency should be reduced by 60 khz.

New tuning of the cavity at 500.32 MHz.

After energy and phase optimization, the storage is obtained with a small dispersive orbit. Probably the real frequency is 500.33 MHz.

Test to decreaase the frequency to see at which frequency we can operate with the FPC if needed. Tuning of the cavity at 500.22 MHz. No storage obtained.

New test at 500.27 MHz. The beam storage is obtained with the dispersive orbit. Machine is depleted. At the moment the lowest frequency at which we can potentially operate is 500.27 MHz.

Coming back to the machine frequency of 500.33 MHz. Storage is obtained. Optimization to be done.

Data are taking at each configiration.

During the shift, we monitored the beam losses measured by 3 connected fibers. The turn-by-turn losses are clearly visible.

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