The BLM detector boxes were installed in the ring. We connected 3 fibers and 2 scintillator detectors in th ring to be able to observe the beam losses.

Cabling, connection and checks of the BLM without the beam.

Machine start-up. Modulator was switched on at ~9h30.

Good storage.

Check of the injector and injection in the ring. Looking for the signal of the BLM withthe beam. Sucesfully; the signal was found with the fibers (see the screenshot attached).

Strange behaviour with the storage shot-by-shot: better and worse storage.  Nicolas, Jean-Noel and Mohamed is trying to check it. All the chain from the synchro generator to the RF cavity was checked and it is OK. To be investigated.

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.

8h30 Start of the modumator, laser, magnet cycling

9h45 Beam is ON. Scan charge vs. RF phase.

Attribute Li/OP/OPT.01-ATT.01  is showing value 340mm, this is different from the nominal ones of 300-303. Charge to be remeasured at nominal ones.

Start of the modulator and laser at ~9h and hour later start the beam.

Working at 500.38 MHz to retrieve the previous state of the ring. Then switching to 500.33 MHz (assumed ring proper frequency).

- Optimization of the injection and ring (orbit, betatron/synchrotron oscyllations,  tune....)

- Load of the new optics with bigger MCF TDR_0.17_0.64_r56_0.4_sx_Dff41.2_DipMagnL.str : MCF=0.0231  chro=0/0. Optimization of the injector and the ring.

- Change the RF frequency to 500.25 MHz. Optimization of the injector nd the ring. The sufficient storage is obtained.

- Going to the 500.33 MHz and working on the orbit, energy and phase.

Observation: either energy or phase of the injector is not stable, it oscillates, so the amplitude of the synchrotron oscillations changes a lot (seen by the TbTX oscillation amplitude). Like this it is very difficult to find the proper energy and phase for the ring. We saved the trend (max TbTX). to be understand and worked out.

To be continued next week.

9h30 Start of the modulator and laser

Start of the beam. Problem with charge, the max charge at the end of the TL 60 pC. We can not increase it by the attenuator. To be understood.

Corrector ri-c2/ps/str.03-h.01 does not work => problem to control and tune the orbit. JNC will look at it. 

Starting point nominal lattice D1Thomx_017_064_r56_02_chro00 with the MCF=0.014  chro=0/0

Goal: test the new lattice with MCF=0.0231  chro=0/0 which alows to decrease the RF frequesncy down to 500.25 MHz. This will make possible operation witht eh FPC.

Total charge measured by the ICT was 60-70 pC. It was not possible to increase it with the attenuator. 

Start working with the new laser spot position on the photocathod (after previous shift by linac group). This also includes the different solenoid alignment and laser positorn feedback setting. We came back to our usual settings.

Work started witht he nominal optics at 500.32 - 500.33 MHz. Correction the orbit and minimization of the synchrotron oscillations. Check the tunes. Observations: it is not possible to reduce considerably the synch. oscilations due to some jitter from injecton to injecton. We do not know whether it is the energy or phase jitter, to be investigated. From orbit measurements w/o RF, we see that that std of the hor. orbit (injection by injection) at BPM3 (high D region) is about 0.26 mm. With the D ~ 1m => dp/p = 0.026 %. It is kind of compatible with the injector energy jitter seen at TL BPM2 : 1 mm correspods to ~0.1% dp/p. It would be good to have some information about the phase stability beetween the ring trigger and the laser. As the result of such jitter, it is difficult to find the proper E and phase and so, correct closed orbit.

RF freq = 500.25 MHz. Dispersive orbit is obtained. Optimization of the injection and storage. No betatron oscillation, should be investigated. A good storage is obtained, which could be further optimezed. 

Work on the BBA. The algorythm does not work correctly with the current TbT orbit. The jitters are quite large in order to detect the orbit change due to quadrupoles/correctors change. Under investigations. 

Measurement of the emittance. The proper/full quadrupole calibration was worked out B(I) from -12 to 12 A. The emittance was measured at 210 A and 220 A. At 220 A from the data taken, the vertical emiitance can not be estimated (gives the imaginary numbers). See the ppt attached.

Suggestion: commission the MRSV to be able to visualize the beam in the ring and set-up fully the EL to be able to measure the chrage and beam images.

End of August: take another data for emittance and study BBA.

Chauffage mod 11h

demarrage machine 14H

on suit le star faisceau step par step

14:  formation CFP + machine (anneau et extraction line)

==> alignement point cathode sur courant d'obscurité + alignement dans Quad (cf. screenshot)

==> affinage extraction line (cf. Screenshot)

Recette sauvegardée dans "good_20240131_16_01_08"

La recette précédente à permis d'injecter directement dans l'anneau (aucune modification autre que phase + atténuateur) (pas de changement de phase cavité RF)

X: trouvé directement (phase 500MHz ajusté à 7.3V)

17h30 : arrât machine

9h: mise en chauffe de la machine (chillers, laser, aimants, modulateur)

Mohamed regle la cavité RF sur 500.06MHz

10h Intervention to repair the water leakage. It was repaired.

New problem with vacuum pomp is found in the ring. The two problems are due to the water leakage. Intervention is ongoing.

12h Warm up of the machine

14h30 Start up of the machine in the mode LI-TL-EL. Goal: tune the injector and perform the measurements.

Mistriggering. All interfaces to see the current freauency do not respond.

Intervention of synchronization team is needed to continue.

15h30 Stop the beam for vacuum intervention .

8h50 Warming up the machine

10h start the beam

Tuning the injector

Beam is injected in the ring.

Problem to start the RF cavity (no injected power, the delta f jumps a lot and the motor position can not converge). Mohamed is contacted.

Problem to restart the DS for the control of the FP cavity table. The CC team is contacted. We are waiting for intervention.

Check of the Ring frequency

11h25 Modulator on stand by

Thanks to Kevin and Mohamed the RF cavity is OK. Restqrt of te beam.

In parallel, Vincent, Ronic and Kevin are investigating the sunchro with the FPC.

The injector is very unstable in energy (random slow change on the TL BPM 2 + usual problem with attenuator ) and LIL phase change/drift (from 114 to 88 deg. during the day). Presence of misstrigering from time to time during the day.

For a certain parameters, a good storage was obtained. But then, due to change of injector parameters the conditions were not kept. Work on the BBA.

Very difficult to work in such conditions, especially on BBA.

8h50 Warming up the machine

Problem with the vaccum around the RF cavity (see screenshot attached). Intervention of vacuum team is needed.

Mohamed is installing the powermeter to monitor the incomingt RF power for the accelerating structure.

Laser camera should be checked before the beam start-up

Due to the vaccum cable connector we can not start the beam.

8h15: mise en chauffe en remote (modulateur, laser, chiller, Cycling)

Tuning of the linac and injection to the ring

Goal: Search for the non-dispersive orbit and proper RF frequency

We started from F =500.059 MHz

Frequency change from 500.05 to 500.0853 MHz

We stopped at 500.0853 MHz and proceeded with the orbit correction

3 steereres are at max values. Studies continue to understand the other possibilities of corection.

18h Stop ThomX

08H25 Start ThomX

09H45 HV is 'ON'

09h49 Breakdown in the RF Gun

09h45 Restart HV

Linac steerers H [2. 66 -4.45]; V [-2.00 2.31]

RF Gun Phase is 223 dg. Att. is 0.0, Charge is -84 pC,  Sect. Phase 193 dg., Att. is 2.6 dB TL/BPM02 X 1mm

10h35  Ring Injection

11h00 Change RF to 500.0913

Tune 0.17

11h35 RF Gun Phase is 228 dg. Att. is 0.0, Charge is -50 pC,  Sect. Phase 196 dg., Att. is 2.65 dB TL/BPM02 X 1mm

There was problem with section temperature. Fixed, Phases adjusted.

12h40 RF Gun Phase is 227 dg. Att. is 0.0, Charge is -40 pC,  Sect. Phase 201 dg., Att. is 2.70 dB TL/BPM02 X =0 mm  

17h15 STOP THOMX

08h18 Start ThomX

10h00 HV is 'ON'

10h35 RF Gun phase is 174 dg. Section Phase is  209 dg. Sect. Att. is 2.70 dB TL/BPM2 X=0, Charge is -127 pC

Linac steerers H [2.66 -4.46], V [-2.00 2.41]

10h40 Start Ring RF 100 kV, TL/BPM2 X=0,5 mm

Ring Studies

12h30 Stop HV and ring RF

12h40 Access: JN went to exchange the shunt resistors

13h26 HV iand ring RF are 'ON'

15h18 RF Gun phasee is 178 dg., Sect. phase is 215 dg.

18h10 Stop ThomX

08h28 Start ThomX

08h40 Some magnets remain switched off. Cycling was not performed

10h20 V is 'ON'

10h55 RF Gun Phase is 165 dg., Sect. Phase is 236 dg., Att. is 0.2 dB. Chargges: -105 pC, -108 pC, -114 pC I TL/DP =255.8 A (70 MeV)

12h40 Ring optic scaled to 70 MeV, there are two turns, start RCDS on injection

12h50 about 2000 turns without steerers and without  RF at the Ring

14h13 Start ring RF

 RF is killing beam at 70 MeV. No phase and energy compatible found. Studies ongoing.

15h57 Return to 50 MeV

16h20 Receipt from 28/11/2024 17h51 There is storage

18.05 Stop THOMX.

08h25 Start ThomX

09h55 HV is 'ON'

10h18 RF Gun Phase is 159 dg. Sect. Phase is 208 dg. Att. 2.66 TL/BPM2 X=-2mm, Isol =230 A, Charges: -115 pC, -95.7 pC, -100 pC

Beam injected to the Ring. There is storage there.

10h25 Ring RF is 'On', 100 kV. Storage OK

10h35 Extraction kicker is 'ON' del. is -12.4 us

10h37 TL/BPMé X=+1 mm to minimize synchrotron oscillations. Tune is 0.17

Response matrix measuring

11h45 70 MeV Receipt for 70 MeV with storage: Sect. Att is 0.204, Phase Sect is 237 dg.

12h00 RF 50 kV Beam is killed by RF

12h10 Change frequency to 500.08095 MHz

Many scans in Frequency- slow no result. Tune optics.

17h30 Hayg by scanning RF found correct frequency : 500.0325 . Recipie : Hayg 70.

Good storage!

08h23 Start ThomX

09h40 HV is 'On'

10h24 RF Gun Phase 183 dg. Sect. Att. is 2.533, Phase 212 dg. Charges; -100.0 pC, -93.0 pC, -109.0 pC, Linac steerers H [2.68 -4.4], V [-2.0 2.19]

10h35 Loading receipt from 06/12/2024 11h30, Thereis storage at freq. 500.10045 MHz, 100 kV

12h34 RF Gun Phase 181 dg. Sect. Att. is 2.553, Phase 219 dg. Charges; -106.0 pC, -100.0 pC, -112.0 pC, Linac steerers H [2.68 -4.4], V [-2.0 2.19]

Adjusting the vertical orbit to BPM1 and BPM2 (-1 mm and -1.5 mm respectively) reduces the vertical spot size on the MSRV camera

Checking BBA

14h00 Controlled access to the bunker to check the X-line shutter

15h00 HV is 'ON'

17h15 Stop ThomX

11h05 Start ThomX

11h50 BPM02-Libera04 wiring has been checked: 'OK' 

12h20 HV is 'ON' 1215 V

12h31 RF Gun phase is 179 dg.

12h48 RF Gun phase is 181 dg. Sect. Att. 2.534 dB, Phase is 213 dg. Linac Steerers H [2.98 -4.66], V [-1.8 2.15]

14h50 HV on Standby. Controlled access

15h20 HV is 'ON'

17h50 Reajust linac transport: linac steerers H [2.38 -4.18], V [-1.9 2.05]  Charge -121 pC, -114 pC, -123 pC

18h55 Stop ThomX

08h25 Start ThomX: Modulator, Frigo, cycling all magnets

08h30 Start chillers

10h00 HV is 'On'

10h25 RF Gun Phase is 193 dg., Sect. Att. is 2.46 dB, Phase is 218 dg. Charges:  -98 pC, -105 pC, -106 pC

Linac steerers: H [2.38 -4.16], V [-1.8 2.15]

Ring injection. After cycling Ri-C1 QP5 is out of order, fixed

10h30 Beam is in the ring, Rec. from 20250109_17_23, TL/BPM02 X=+3 mm

11h00 setings for ring without sextupoles for LOCO

11h04 setings for ring without sextupoles for LOCO (Matlab config file) is saved

The same with sextupoles.

Trying LOCO with sextupoles: LOCO inprove results on storage and tune. Tune changed from 0.15 to 0.17

13h30 HV is 'Off'.  Controled access to the bunker.

13h55 HV is 'On'

/tmp_mnt/data/shared/commissioning_scripts/MatLab/pilotage/libera_calctunesS_ThomxOperateur.m  to measure tune from operateut.thomx account

16h55 Stop ThomX

08h25 Start ThomX: Modulator, frigo

08h35 Start chilers, laser, cycling all magnets

10h05 HV is 'On'

RF gun phase is 161 dg., Dark current about 25 mV, Att. Sect. is 2.53 dB, phase is 213 dg., Charges: -101 pC, 99. pC, -109 pC

Linac steerers: H [2.63 -4.38], V [-2.03 2.47]

10h20 RF cavity; problem with amplifier: fixed

10h25 Beam injected to the ring without RF, RCDS on the transfer line

10h45 RF is 'On'  150kV, phase -58.5 dg. TL/BPM02 X=0 

10h55 Receipt saved (I dp in ring at 159.3 A)

LOCO

11h38 Jump in Vertical position at TL/BPM01 on +1mm. Storage drops

Change the linac steerer V1 to -2.23 TL/BPM01 Y=-0.5 mm

12h16 Start feedback on the TL/BPM.01 position X=0, Y=-0.5

14h30 Start cycling dipoles and quads of the ring

14h43 The receipt from 10h55 loaded. Storage restored

15h10 ring settings with I dp = 160.4 A loaded (from the receipt of 20250110_11_04)

18h05 Stop ThomX