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Message ID: 662     Entry time: Fri Jan 6 09:17:54 2023
 Author: ND, IC, VK, VM 
 Status: Under Process 
 Type: Shift summary 
 Category: Ring 
 Important:
 Subject: Prise de donnee 6/01 
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9:15 Mise en chauffe modulateur

10:23 Temperature chiller incorrecte

11h Optilization of the beam for injection. Beam is unstable, what is seen fro, the x/y position trends in the TL. Then, from time to time the beam is not injected in the ring causing the jumps in the signal intensity ???

12h  Hayg helped to find the good conditions and we started to inject in the ring but still with the not stable beam.

14h We try to store the beam by optimizing the parameters of the RF cavity => approaching the good storage. Suddenly the beam changed the parameters and we lost injection.

16h Trying to reestablish the injection and perform the optimization AGAIN

17h Difficult to restore the storage: beam from injector is not stable and therefore difficult to see the effect from the ring studies

18h After several studies, we found the proper RF frequency for current ring settings 500.4259 MHz

With ~20 kV obtained storage is about 15 ms measured with the additional electrode on the scope. Libera several times went down and had to be restarted.

The injection is not stable (intensity goes from 0 to max value), which makes it VERY DIFFICULT to optimize the beam storage in the ring. We added two QUAD (4 and 5) to our optimization routine.

After orbit correction the storage was 100 ms with ~20 kV RF and fRF = 500.404 MHz

Studies to be continued. More stable beam is requested from the injector.

19h30 Shift is finished.

 

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