08h43 Start ThomX: Modulator, frigo, laser, cycling all magnets

08h50 Chillers started

09h52 HV is 'On'

10h08 HV=1215V

10h25 RF Gun Phase is 153 dg., Sect Att. is 2.5 dB, Phase is 206 dg. Charges: -107 pC, -107 pC, -113 pC

10h30 Beam injected to the ring, Receipt from 16/01/2025  18:03 TL/BPM02 X=+2mm, without RF the ring orbit is low (all negative)

11h00 RF is 'On', 100kV

11h07 FR 150 kV; to minimize synchrotron oscillations TL/BPM02 X=+2 mm

11h33 Vacuum interlock, restarted

12h28 FPC table Scan

12h40 FPC table scan: sigma Y=171 um

13h33 FPC table scan: sigma Y=156 um

13h57 RF voltage set to 250kV

14h20 FPC table scan: sigma Y=179 um

14h25 The ring optics from 10-Jan-2025 11h03 loaded

Vertiacl tune studies. Steptune 0.05 several tilmes , vertical tune start to be pronounced; Tune correction towards the nominal one 0.64;

15h27 FPC table scan: sigma Y=126 um

16h00 FPC table scan: sigma Y=121 um

For all scans FPC power 90 kW, laser size was 70 um

17h35 Stop Thomx

08h41 Start Thomx: Modulator, Frigo, Laser

08h46 Start chillers, all magnets sycling

09h50 Start RF

10h55 Linac steerers are about from 22/01/2025: H [0.49 -2.94], V [-3.13 3.39] to align with QP1 - QP3

RF Gun phase is 164 dg., Sect. Att. is 2.64 dB, Sect. phase is 208 dg., Charges: -108 pC, -115 pC, -119 pC

if set QP5 through QP7 and all TL steerers 'Off' but TL/Str01-V1 (-1.6 A): TL/BPM02 X,Y 0,0; TL/BPM03 X,Y -6.0,+2.0, TL/BPM04 X,Y -6.0,+5.0

11h30 Beam is in the ring: TL/BPM02 X,Y 1.2,0.9; TL/BPM03 X,Y -4.6,+3.2, TL/BPM04 X,Y -2.7,+2.7

14h43 Good Receipt 50 MeV for X rays

14h55 FPC table scan: sigma y =140 um

15h16 FPC table scan: sigma y =124 um

16h25 X ray detector level 40000

16h57 RF 150 kV, X ray detector level 50000 (one point)

It seems that Ri-C1 STR06-V01 and  Ri-C2 STR02-V01 have wrong polarity

18h05 Breakdowns in the RF Gun, Vacuum interlock

18h10 Restored

18h20 Stop ThomX

50 MeV

Configuration: good_20250123_17_53_01 "Working Point at 50 MeV for X_rays"

After RCDS optimization with X-rays good_20250124_15_05_25 "Updated WP with RCDS on X-rays 50 MeV "

Update from 14/02/2025 => Configuration: good_20250214_14_21_55 "50 MeV WP 120 um"

RF Frequency: 500.10045 MHz (33.XXXX MHz)

Vertical size of the interation region: 124 um =>laser beam size: 75 um (assumed); electron beam size : 99 um

Beam orbit:

BPM around IP

BPM3 ri-c1/dg/bpm.04-lib.03: x= 0.6 mm y = -2.87 mm

BPM4 ri-c1/dg/bpm.05-lib.04: x= 0.5 mm y = -2.96 mm

After RCDS

BPM3 ri-c1/dg/bpm.04-lib.03: x= 0.6 mm y = -0.18 mm

BPM4 ri-c1/dg/bpm.05-lib.04: x= 0.3 mm y = 1.88 mm

RF gun 231 deg. Sect. Att. set to 2.43 dB, Sect. phase is 209 dg. TL/DP current set to 159.3 A, Linac steerers H [1.16 -3.2], V [-2.25 2.86] ; TL BPM2 x =  mm

Run with FPC P= 89 kW

X-ray intensity (synchronized mode): max 50000 pA ~2-3x10^10 ph/s

61.5 MeV

Configuration: good_20250214_16_29_22 "61.5 WP 177 um"

RF Frequency: 500.04545 MHz (33.XXXX MHz)

70 MeV

RF Frequency: 500.03165 MHz (33.XXXX MHz)

Att 0.3 dB

40 MeV

40 MeV. Sect. Att. set to 4.095 dB, Sect. phase is 205 dg. TL/DP current set to 125.38 A, Linac steerers H [1.19 -3.25], V [-3.05 3.47]

TL BPM 20= -2 mm

RF cavity 50 kV, Freq=500.11896 MHz

RF Frequency: 500.11851 MHz (33.341230 MHz)

Vert FPC scan : IP region 0.199 um

X ray flux asynch I3 ~ 370 pA (background level 310-315 pA)

43.7 MeV

RF gun 162 deg. Sect. Att. set to 3.51 dB, Sect. phase is 210 dg. TL/DP current set to 136.95 A, Linac steerers H [0.44 -2.77], V [-2.36 2.87]

TL BPM 20= -1.5 mm

RF Frequency: 500.1189 MHz

35 MeV

RF gun 162 deg. Sect. Att. set to 4.98 dB, Sect. phase is 202 dg. TL/DP current set to 111.3 A, Linac steerers H [], V []

TL BPM 20= -1.5 mm

RF Frequency: 500.1189 MHz

08h45 Start Thomx: Modulator, frigo, laser

08h50 Start chillers, cycling all magnets

Vacuum intervention, beam pipe closed. Vacuum OK to start (11.23)

Vacuum MPS off (Kevin)

Polarity of 2 vertical steerers in the ring :! ric1/str.06-v.01 and

ric2/str.02-v.01 were changed by Jean Noel, according to our request. 

11h20 HV is 'On'

RF Gun phase is 162 dg. Att. is 0.04 dB, Sect Att. is 2.62 dB, Phase is 212 dg. Charges: -107 pC, -112 pC, -117 pC

14h12 FPC table scan. Sigma y = 140um (receipt from 14h14). RF 150 kV

Accelerating section phase often needs  adjasment (from 106 dg. to 112 dg. )

Trying LOCO. 

14h51 the receipt from 14h14 loaded (saved before LOCO). The FPC table at X ray max. (X photodiode reading of 470 pA ). Ramp the RF cavity to 250 kV

14h58 Slava made RCDS on X photodiode readings by adjusting vertical steerers of the ring.   X photodiode reading is 500 pA

15h04 Receipt seved. X photodiode readings reaches 522 pA.

15h15 FPC table scan. Sigma y = 128 um (receipt from 14h14). RF 250 kV

15h22 RF Gun phase is 166 dg. Att. is 0.04 dB, Sect Att. is 2.62 dB, Phase is 212 dg.

Beam position at TL/BPM02 unstable from the trigger to the trigger, so the ring storage.

16h00 Going to 61.5 MeV. Sect Att. at 1.1 dB, phase 228 dg. RF at 500.04545 MHz, 50 kV TL/BPM02 X=+4mm

16h38 receipt saved. There is some storage, but orbit is wide

17h30 Optimized configuration for 61.5 MeV very good storaga => Rceipt good_20250124_17_36_24

08h45 Start Thomx: Modulator, frigo, laser

08h50 Start chillers, cycling all magnets

Vacuum intervention, beam pipe closed. Vacuum OK to start (11.23)

Vacuum MPS off (Kevin)

Polarity of 2 vertical steerers in the ring :! ric1/str.06-v.01 and

ric2/str.02-v.01 were changed by Jean Noel, according to our request. 

11h20 HV is 'On'

RF Gun phase is 162 dg. Att. is 0.04 dB, Sect Att. is 2.62 dB, Phase is 212 dg. Charges: -107 pC, -112 pC, -117 pC

14h12 FPC table scan. Sigma y = 140um (receipt from 14h14). RF 150 kV

Accelerating section phase often needs  adjasment (from 106 dg. to 112 dg. )

Trying LOCO. 

14h51 the receipt from 14h14 loaded (saved before LOCO). The FPC table at X ray max. (X photodiode reading of 470 pA ). Ramp the RF cavity to 250 kV

14h58 Slava made RCDS on X photodiode readings by adjusting vertical steerers of the ring.   X photodiode reading is 500 pA

15h04 Receipt seved. X photodiode readings reaches 522 pA.

15h15 FPC table scan. Sigma y = 128 um (receipt from 14h14). RF 250 kV

15h22 RF Gun phase is 166 dg. Att. is 0.04 dB, Sect Att. is 2.62 dB, Phase is 212 dg.

Beam position at TL/BPM02 unstable from the trigger to the trigger, so the ring storage.

16h00 Going to 61.5 MeV. Sect Att. at 1.1 dB, phase 228 dg. RF at 500.04545 MHz, 50 kV TL/BPM02 X=+4mm

16h38 receipt saved. There is some storage, but orbit is wide

17h30 Optimized configuration for 61.5 MeV very good storaga the RF cavity at 500.04545 MHz => Rceipt good_20250124_17_36_24

Orbits with and without RF are close

17h40 Stop thomx

8h50 Mise en chauffe modulateur

Changement de la carte mère pour la badgeuse de la ligne X

31.2degres, toujours dAlignement laser dans la casemate

Canon complètement désadapté à 1200 et 1215V à la température de 31.6 degres, passage à 31.2 degres, toujours desadapté (cf screenshot) ???

Nous étions à 25Hz , passage à 10Hz.

Adaptation du canon ok

14h-15h: Tentative d'observation du rayonnement synchrotron sur la caméra à balayage. Le signal est visible en mode focus (sans balayage temporel) mais pas en mode avec balayage temporel. Est-il trop faible?

15h-18h: Optimisation du MRSV. Changement d'un miroir de renvoi qui était abimé, ajustement de la position de la lentille pour faire une image plus nette.

Lors du déplacement de l'anneau l'axe optique du MRSV a bougé.

Avec l'orbite par défaut, nous ne voyons que le bord du faisceau. Il faut changer l'orbite pour voir le centre du faisceua. Cf images jointes.

18:00 On laisse la machine à Hayg.

08h20 Start ThomX: modulator, laser, fridge,cycling all magnets

08h25 chillers are started

09h50 Controlled access (Rhonic)

09h57 HV is 'On'

10h00 HV is at 1215 V

10h04 RF Gun phase is 136 dg.

10h10 Receipt from 13022025 15;05 loaded

Sect. Phase is 215 dg., Att. 2.48, TL /BPM02 X=0

The yesterday receipt does not provide yesterday storage. The ring was adjusted.

13h20 Vacuum interlock in the ring

13h40 Tthe linac waz reajusted after the interlock. RF Gun phase is 124 dg. Sect. Phase is 215 dg. TL /BPM02 X=3.5 mm

14h21 Scan FPC table. Vert. sigma 120um

Charge: -109; -104; -117 pC

15h00 61.5 MeV. Charges: -110, -107, -113 pC; F=500.04545, 100 kV, Manual phase shifter on 5254, RF phase is 23.5 dg. (the mixer phase shifter for amplitude 3562 )

15h34 Scan FPC table, so-so.

16h15 Scan FPC table 177 um.  Recipt All_202050217_16_22

16h59 70 MeV Sect. Att. 0.244 dB, Phase 238 dg. TL/BPM2 X=-0.5 mm. Linac steerers: H [0.19 -2.85], V [-3.63 3.49]

18h05 Can not store the beam

18h06 Stop ThomX

08h26 Start ThomX: Modulator, Fridge, Laser

08h32 Chillers were started, cycling all magnets

11H changement de la carte synchro... Carte synchro opérationnel

Impossible d'avoir un signal sur l'ICT1 qq soit la phase ==> synchro ??

Vincent est repasse c ok

13h20 Receipt from 202514_14_21_55 loaded (suitable for 50 MeV), injector adjusted, there is a beam in the ring without RF and with RF 50 kV, 36.5 dg. It is necessary to adjust the injection (storage is not too bad, but TL/BPM2 x=+7.5). The injection kicker affects the radio protection system, causing blocking.

13h55 the modulator is in the standby mode, the laser shutter is closed

08h25 Start ThomX; Start ThomX: Modulator, Fridge, Laser

08h32 Chillers were started, cycling all magnets

11h23 HV is 'On'

11h46 RF Gun Phase is 28 dg. Sect Att. is 2.54 dB, Phase is 209 dg. TL/BPM2 X=0, Charges: -88, -92, -96 pC

Linac correctors: H [0.59 -2.86], V [-3.23 3.47]

12h24 Beam in the ring RF 50 kV, Phase 44 dg.

12h35 RF 150kV, Phase 32 Kicker delay 7.3952 us,  9497 V

17h10 HV on 'Sttandby', the laser gate closed, injection kicker pulse correction

17h52 injection kicker pulse was corrected

HV is 'On'

18h39 The beam is in the ring. It is OK!

18h45 Stop ThomX

08h53 Start ThomX

11h10 The oscilloscope installed in the bunker

11h11 HV is 'On'

11h45 The beam is in the ring

12h10 The modulator set to the Standby mode. Access to the bunker

12h24 HV is 'On'

12h30 RF Gun Phase is 15 dg., Sect. phase is 204 dg., Att. is 2.503 dB, TL/BPM2 X= 4 mm, Charges: -108 pC, -108 pC, -120 pC  

12h35 Feedback on linac injection was started

13h00 Measurement of the stability of the temporal position of electron and photon bunches at the IP. RF Cav. at 200 kV, Phase 35 dg.

13h07 The linac was adjusted: RF Gun phase 10 dg., Sect phase 199 dg. Charges: -100 pC,-99 pC, -110 pC, Inj. qual. 0.965, Storage qual. 0.802

14h26 The linac was adjusted: RF Gun phase 11 dg., Sect phase 203 dg. Charges: -99 pC,-99 pC, -109 pC, Inj. qual. 0.984, Storage qual. 0.747, X ray flux I3=25000 pA

Phase between electron beam and FP photon have been done (attachements will come later) (Electron beam is a pickup (150ps fall time) at the IP and Photon beam  is a photo diode (300ps rise time) at the FP cavity output).

time jitter is measured as the time difference between the two ulses at a fixed treshhold of 10mV)

measurements show a 33ps FWHM jitter (15ps)   as long as the FPC is locked on the 500MHz . the jitter mainly come from FPC (see post FPC : https://elog.lal.in2p3.fr/FPC/THOMX+commissioning/416)

15h35 The linac was adjusted: RF Gun phase 19 dg., Sect phase 212 dg. Charges: -105 pC,-104 pC, -115 pC, Inj. qual. 0.988, Storage qual. 0.786,

17h45 Stop ThomX

08h27 Start ThomX: Modulator, Laser, Frig

08h34 Chillers were started, cycling al magnets

12H ready to start beam ( 13H30)

alignement laser done (alignement to do)

13h20 HV is 'ON'

13h31 RF Gun phase is 95 dg. the laser iris is 1.3 mm, the laser att. 340, RF Gun charge is -120 pC (the laser spot position was Hor. 4.282 mm, Vert. 3.327 mm ), screenshots of Li/SST1

13h35 laser spot alighment started at RF gun phase of 145 dg.

13h36 New position of the laser spot is: Hor. 4.282 mm, Vert. 3.327 mm 

13h44 the modulator was put into standby mode, access to the bunker

14h13 HV is 'ON'

Two plots beam on LI STT 0.1

new receipe all 2025 03 13  14 46 52 

Charge 120pC

RF power 150KV

17h12 RF gun phase 92 dg., Sect. phase 211 dg. I TL DP =159.3 A, TL/BPM X=4 mm, RF cav. 150 kV, phase -15 dg. Sum of TBTSum =1.8e11, Charges: -142 pC,-140 pC, -152 pC, I3 25000 pA

17h31 Adjusting ring lattice to rise X rays. I3 max was 45000 pA

18h29 Stop thomX

08h00 ThomX started by Maher

09h50 Problem with vacuum in the septum. TL-V3 and EL-V1 are closed.

ThomX configuration changed to 'Linac'.

0955 Laser is 'On'

10h03 Problem with vacuum was fixed. ThomX configuration changed to 'ThomX'.

10h05 Cycling all magnets

10h10 HV is 'On'

10h20 From time to time TO-V3 and EL-V1 close. Septum vacuum is 2.6e-10

Septum power supply is interlocked

10h55 , RF gun phase is 235 dg., Sect. phase is 216 dg., Att. = 2.38 dB, TL/BPM2 X=0.2 mm , Charges: -91 pC, -90 pC, -98 pC, Linac steerers: H [0.84 -2.88], V [-2.47 2.8], receipt from 20250321 12:30:52

11h27 V6 interlocks

11h49 RF gun phase is 225 dg., Sect. phase is 209 dg., Att. = 2.46 dB, TL/BPM2 X=0.2 mm

12h46 to 13h10 Emittance measurements at 50 MeV

13h Problem with Pulsed Elements => fixed by Kevin and Maher

13h30 Tuning of the linac for 70 MeV, emittance measurements.

14h Check the machine at 50 MeV

15h25 The modulator at standby mode. Access to the bunker.

15h45 61.5 MeV receipt from 14/02/2025

Synchronization problem,

17h00 RCDS on injection

17h19 RF Gun phase is 224 dg., Sect. phase 221 dg. Att. 0.975 dB, Charges: -107 pC, -105 pC, -115 pC. TL/BPM2 X=1 mm, RF cav. 100 kV, phase -34 35 dg. manual phase sfifter 7809, phase shifter to measure amplitude 6759. Receipt 20250331 17:12:34

08h42 Start ThomX: Morulator, firg, laser

08h47 Chillers, cycling all magnets

10h40 HV is 'ON'

10h58 RF Gun phase is 225 dg. Correctors H [0.82 -3.05]; V [-3.1 3.28], Sect phase is 220 dg., Att. 0.975 dB, Charges: -95 pC, -94 pC, -103 pC

11h12 Beam in the ring RF cav. at 50 kV, phase -34.5 dg.,  receipt from good 20250331 18:08:02

11h25 Interlock by Radioprotection in the laser room

11h48 Fixed by Atanas, HV is 'ON', RF gun phase is  220 dg., Sect. phase is 224 dg. Linac correctors H [0.82 -3.05]; V [-3.29 3.19],

12h06 emittance measurements by QP3, QP1 and QP2 at zero hor. 3.3 mm*mrad, vert. 2.9 mm*mrad

12h19 beam in the ring TL/BPM2 X=0 mm

13h20 Going to 40 MeV. Sect. Att. set to 4.095 dB, Sect. phase is 205 dg. TL/DP current set to 125.38 A, Linac steerers H [1.19 -3.25], V [-3.05 3.47]

RF cavity 50 kV, Freq=500.11896 MHz

16h42 RF cav. at 100 kV, Phase -7.5 dg. receipt 20250401 _15_25_35, RF Gun phase 219 dg. Sect. phase 201 dg. Att. 4.084 dB, TL/BPM2 X=4.5 mùm

17h16 Stop ThomX

Freq. for RF Cav. set to 500.10051 MHz (should be 500.10045 MHz)

08h15 Start Thomx: modulator, frig, laser

08h21 Chillers started, all magnets cycling

Filesystem very slow

Allarm vacuum valve are in alarm

RAC.17-RDP.01 still faulty

09h38 HV is 'ON'

10:15 Calc DS for attenuators was crashed. It restarted at 0dB attenuation...

12:43 SR on target with Iris closed

Alignemnt...

17:30 Measurement of the bunch length in the ring  ~140ps

08h22 ThomX was started: modulator, frig, laser

08h28 Chillers was started, all magnets cycling

09h45 HV is 'ON'

There was a problem with the section phase shifter motor. It was fixed by moving the motor a lot.

11h11 RF Gun phase is 149.6 dg., Sect. phase is 207 dg., Att. is 2.77 dB. TL/BPM2 X=0.9 mm. Linac steerers: H [0.54 -2.76], V [-2.29 2.61], -36 pC, -36 pC, -39 pC, RF cav. at 50 kV, phase 21.0 dg. TbTSum in the ring about 2e7

13h0.5 TL optics was set to MADX simulated one. After adjusting the DPI and the septum, charge in the ring and X ray flux did not change. (receipt 20250502_13_04) RF Cav. at 150kV, phase 13.5 dg

13h20 dispersion measurement in the TL

15h38 New lattice loaded, injection was adjusted as well as the ring elements a little bit.

17h00 ThomX was stopped

08h20 ThomX was started: Modulator, frig, laser

08h27 Chillers were started, cycling all magnets

10h50 HV is 'ON'

12h38 RF Gun phase is 209 dg. Sect. phase is 207 dg. Charge from the RF gun is -70 pC. Laser Att. 260. 

The strange behavior of the ICT signals does not allow for phase charge scanning.

Laser Att.      Gun Charge pC

260                -70

270               -102

280               -157

290               -255

300              -320

310             -370

320             -400

400             -470

The receipt for MRSV --> for -440 pC Isol=240, adjasted phases (RF Gun 201 dg., Sect. 205 dg.).  RF Cav. at 150 kV, Phase 16 dg., More or less good storage. ri-c1/BPM.03- Lib.03 TbTSum 1.8e8

-58 pC -->ri-c1/BPM.03- Lib.03 TbTSum 4e7

Scaling of the charge, very roughly:

In the injector, the charge measured by BPM after the e- gun 440 pC/58 pC ~7.6

In the ring, the TbTSum @2000turns 1.8e8/4e7 ~4.5

So, the difference is 1.6. This can be explained: beam losses in the ring during the injection, transport efficiency from the gun to the ring

14h40 HV was off. Access to the bunker

14h56 HV is 'ON'

15h12 HV was off. Access to the bunker

15h20 HV is 'ON'

15h17 Series of breakdowns in the RF Gun without interlocking

15h31 HV was off. Access to the bunker

15h42 HV is 'ON', RF Cavity interlock, fixed . There is no image. MRSV camera needs to be checked

16h04 HV was off. Access to the bunker

Problem with the camera was fixed

16h27 HV is 'ON', Charges: -424 pC, -420 pC, -461 pC

16h39 RF Gun phase set to 203 dg. sect. phase 203 dg. HV was off. Access to the bunker

16h50 HV is 'ON'.  Charges: -423 pC, -420 pC, -461 pC, ri-c1/BPM.03- Lib.03 TbTSum 2e8

17h04 HV was off. Access to the bunker

17h13 HV is 'ON'. 

17h24 HV was off. Access to the bunker

17h41 HV is 'ON'. 

17h52 ThomX was stopped

Goals:

- Work on the BLM to have the signals at the injection and from the arc in the ring.

- Study on the ring injection and beam storage at higher beam charge. Check the linearity.

09h35 Thomx was started: modulator, frig, laser

09h41 Chilers were started, all magnets cycling

10h47 HV is 'ON'

10h57 Hv is 'OFF', Access to the bunker

12h10 HVis 'ON'

RF gun phase was set to 198 dg., sect phase 206 dg., Sect Att. 2.62 dB, Chgarges: -59 pC, -59 pC, -64 pC, laser att.  270

13h13 Unable to get the beam into the ring. Change kickers back.

14h40 HV is 'OFF', Access to the bunker to check/reconnect the BLM

The "Extraction" kicker did not allow to store the beam. Maher exchanged the kicker PS back.

Restart. Ring tuning is OK.

Gradual increase of the charge from the RF gun. Tuning and measurements of the charge in the ring (integral of the TbT sum signal @2k turns). Please, see the plot attached.

We made 4 points. For each one, the solenoid, TL quaqrupoles and steering and injection were changed by looking at the BLM signal (ring injection). Ring kept unchanged.

A special attention should be given to the transport efficiency (and emittance), when increasing the charge.

18h Stop THOMX

Goal: Beam Loss Monitors and Ring injection at high charge. Studies of the injector for high charge. Emittance measurements.

08h33 ThomX was started: modulator,frig, laser

08h40 Chilers were started, all magnets cycling

11h05 HV is 'ON'

11h15 RF Gun phase 194 dg. laser att. 280, Gun charge -100 pC.  Breakdowns in the RF gun

12h14 Breakdowns in the RF gun. Vacuum interlocks. Drop HV to 1210.

12h30 Restore HV

Increase of the charge from 100 pc to 450 pC. Tuning of the injector and ring injection. We suceeed to minilize the injection losses for the high chege. After our studies,  the charge in the ring incresed proportinally to the charge in the linac measured with the BPM.

The recettes were saved in the folder REFERENCES

50MeV_450pC_BLMRCDS_Ratio1_20250527_15_12_22 (best storage with min losses)

15h50 RF gun phase 190 dg., Sect. phase 206 dg., sect. Att. 2.61 dB, Laser Att. 420, Charges (BPMs): -451 pC, -451 pC, 437 pC, Sum(TBTSum = 5.4e11). Receipt: 50MeV_450pC_BLMRCDS_Ratio1_20250527_15_12_22

Emittanse mesurement with QP3 (Isol=235 A)

beta x = 5.0264 alpha x = -1.5425 Horizontal normalized emittance 11.6 mm*mrad

beta y = 7.8251 alpha y = -3.0341, Vertical normalized emittance 7.9 mm*mrad

16h35 RF gun phase 184 dg., Sect. phase 204 dg., sect. Att. 2.69 dB, Laser Att. 303, Charges (BPMs): -219 pC, -216 pC, 240 pC, Sum(TBTSum = 3e11). Receipt: 50MeV_450pC_BLMRCDS_Ratio1_20250527_15_12_22

Emittanse mesurement with QP3 (Isol=235 A)

beta x = 51.2017 alpha x = -15.6429, Horizontal normalized emittance 1.1 mm*mrad

beta y = 5.7487 alpha y = -2.2848, Vertical normalized emittance 4.5 mm*mrad

08h00 ThomX was started

Goals: Emittance measurements, ring optics study

10h00 HV was 'ON'

RF Gun phase 240 dg. (the previous day was 190 dg.), Sect. Att. 2.42 dB (the previous day was 2.61 dB) Laser Att. 280, Charge -106 pC

Emittance measurements vs RF Gun phase for 109 pC, 208 pC, 360 pC

Ring optics study.

17h20 ThomX was stopped.

Goals: Optimization of the IP. Verification of the llaser waist position and electron beam angle wrt. collision plane.

08h25 ThomX was started; Modulator, Frig, Laser

09h30 Chillers were started, cycling all magnets

RI-C1/PS/STR.06-H.01 is out of order. Fixed with the health check by killing the device server.

09h58 HV is 'ON'

10h20 RF Gun phase is 162 dg., Linac steerers H [0.52 -2.73], V [-228 2.70], Sect. phase is 211 dg.,  Sect. Att. is 2.55 dB, TL/BPM02 X=0, Charges (BPMs): - 111 pC, -111 pC, -123 pC, -123 pC

Receipt from 04/06/2025 17h11

10h29 Beam transported to the ring

10h30 The ring RF cavity did not start due to interlock on  Pi, Pr, RF. Fixed

11h - 14h Optimization of the ring by using also MRSV. We have arrived @MRSV to the sigma_x = 16.4 pixels and sigma_y = 13.5 pixels.1 pixel = 41 um.

14h Operation with X-rays

We started withthe flux of 50 pA and optimize it till 350 pA (sometimes up to 400 pA). The vertical orbit is attached. The X-ray flux depends strongly on the tuning of the Linac and TL + injection. During the optimization we do not modify the Ring elements. By changing the vertical corrector in the TL, the flux was increased by 100 pA. To be understood.

The injected charge in the ring shows slow oscillations, same as the ICT signals in TL (see screenshots). From time to time the injection/charge starts to jump, sources (similar situation is with FPC laser)

Start of the vertical and horizontal scans. initial pos_Y   = -1.24 mm

With these data we get ANGLE =  5.1 mrad

With the vert orbit Ring BPM we calculated the following:  BPM3 =-2.62 mm pos. 3.93 m and BPM4 = 2.99 mm pos 5.074 m => ANGLE = 4.9 mrad

Very good agreement given the precision of the measurements.

Stability of the injector is very important during these measurements.

We made the quasi flat vertical orbit around IP ANGLE 0.09 mrad. As for now, for this vert. orbit, the flux is 3 times lower ~110-120 pA, despite different scans and attempts to inclrease it. Apparently, vert. orbit in SEXT is very important and in current configuration should be offset.

19h STOP THOMX

Astra simulation of the phase charge scan (see figure) shows that this is a convolution of the electron bunch generated by the laser pulse, since electrons cannot be generated at the negative field at the cathode. Therefore, the zero crossing is a cutting edge. The maximum acceleration corresponds to 48.5 degrees. 

From the phase charge scan (see figures): Sigma1=1/0.462/1.4=1.5 dg. (morning), Sigma2=1/0.337/1.4=2.1 dg. (evening). But it seems that last one has satellite bunch.