08h35 Start-up modulator (it was already on standby), laser, magnets, cycling.

As yesterday there is a problem with the MPS to start the machine. We are trying to investigate whether it is related to the vacuum or something else.

Problem with the solenoid COL.01 (Internal Interlock Hard).

Help is needed.

At this moment, apparently we are blocked by the closed vacuum valve of the FPC. To be checked with Nourredine (emails sent).

The vaccum level in the FPC is not yet good to open the valve. Eric will check it.

10h10 Switched to the Linac+TL+EL configuration. HV is on (the modulator was in the local mode). Interlocks even at HV 1200 V, the sect att. 3 dB. Linac 04 vac is high.  

10h33 There are breakdowns at 26 dB the section att. and 25 dB of the RF gun att. These are not in vacuum breakdowns. Probably it is the klystron problem.

10h50 The modulator is in the standby mode.

Maher is coming to check the klystron and Jean-Noel is working on the solenoid power supplies.

11h40 Maher fixed problem with the klystron by increasing the filament power. At 84 kV, I = 48.7 A (microperveance 2.0). At 293 kV, I = 294 A (microperveance 1.85, should be 2.0).

12h03 The machine configuration without FP closes the photocathode laser shuter, so we can operate only in the Linac+TL+EL configuration.

12h36 Energy = 50 MeV, Laser Phase 25 dg., Sect. Phase 253 dg., Sect. Att. 2.26 dB, I_Gun -95.0704 pC, I_Linac -92.7397 pC, I_TL -3.7568 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg.

Laser Att. 360, Linac steerers H: [0.31 -2.62], V: [-1.87 2.88]

12h43 Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.35 dB, I_Gun -101.3924 pC, I_Linac -99.5194 pC, I_TL -101.3812 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg. 

13h17 Laser Att. 410 (max) Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.35 dB, I_Gun -138.8712 pC, I_Linac -135.3968 pC, I_TL -137.4172 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg.

At the moment maximum charge is 135 pC with irise Ø of 1.3 mm  (possibly because the laser photocathode shutter is in the wrong position)

13h25 The modulator is in standby mode. Maher can remove the MPS short.