07h30 Start-up modulator, laser, fridge, chillers, cycling remotly

Vacuum in the FPC is still ~1e-7 (sometimes goes to ~7-8e-8);

No RF signals. The same problem.

Vacuum problem in the half ring; same as on Friday. Solved by Eric.

Problem with SEPTUM. It does not start.

RF cavity in the Ring can be se only to 10 kV. We can not set other voltage. Maher checked, probably the rror with profibus. Hep is needed.

10h30 starting the linac. Transport of the beam in the TL.

Cameras do not work corretly, so it is difficult to adjust the energy spread of the beam.

Septum problem prevents us to inject in the ring.

10h56 Energy = 50 MeV, Laser Phase 108 dg., Sect. Phase 220 dg., Sect. Att. 2.43 dB, I_Gun -71.6393 pC, I_Linac -69.4399 pC, I_TL -69.8472 pC RF_Ampl. 10.8122 kV, RF_Phase -48.5 dg.

11h JN is helping with the RF cavity

13h The problem with RF cavity is not solved, the reson why the voltage does not inrest and stays at 10 kV is not clear.

Maher with JN tries to solve the problem with SEPTUM,

13h20 Septum is OK now. Beam is in the ring w/o RF. recipe_recipe_LI_TL_RI_all_20260422_18_34_34.txt loaded

13h30 Laser Att. 340

13h33 Energy = 50 MeV, Laser Phase 108 dg., Sect. Phase 220 dg., Sect. Att. 2.52 dB, I_Gun -92.8156 pC, I_Linac -122.1748 pC, I_TL -95.4294 pC RF_Ampl. 0 kV, RF_Phase 0 dg.

14h Mistreggiring problem. Nicolas found that the IP address of Rigol changed.

The colleage from SOLEIL will come in the afternoon to see the problem with the RF cavity.
The PC in the control room (client 1 and 2) are very slow, not clear what is the reason.

15h17 Kickers off. TL/DP off. Energy = 50 MeV, Laser Phase 108 dg., Sect. Phase 220 dg., Sect. Att. 2.52 dB, I_Gun -102.5088 pC, I_Linac -99.2102 pC, I_TL -0.0013676 pC RF_Ampl. 0 kV, RF_Phase 0 dg.

I am trying to check the beam charge using TL/FC01. The cable from wac02/ch0 (A9 on cross-panel #xxx) was connected to the oscilloscope CH2 (impedance 1 MΩ). According to Vincent, the cable length is 31 m, and the capacitance is 2.5e-9 F. At the operating point, the dark current and the beam charged the cable (approximately 6 μs after triggering) to -35.69 mV. The dark current alone charges the cable to -13.7 mV (with the screen inserted). Therefore, the beam charge is Q=C*V=2.5e-9*22e-3=55e-12 C. With the screen inserted - DeltaV=22.7 mV. The first attempt to change the position of the beam does not increase this voltage significantly (but reduces it at large displacements). Reducing the solenoid current to 180 A increases the voltage on the cable, but the DeltaV remains almost the same: 23.3 mV (58 pC). Thus, there is a certain discrepancy between ICT measurements and result of these measurements that needs to be understood.

17h35 The RF resonator is now working. But the RF resonator DS does not show the frequency. It is necessary also to adjust the phase of the resonator.

17h43 ThomX was stopped