Bonjour,

Pouvez vous enregistrer les images de l'oscilloscope et le donnée brute à la place des screenshots. Il y a une option dans l'interface web pour enregistrer l'oscillogramme "proprement". De même pour les images, cela permet de faire des traitements à posteriori.

Merci.

Goal: understanding of teh beam natural revolution frequency. Study the effect of the dipoles.

We have started from the previous setting of the machine. Then we loaded the settings from last december and received better storage. RF cavity is OFF.

By working with the spectrum analyzer, we understood that previous measurements very probably were affected by the noise coming from the synthetizer, so the frequency measured corresponded to the synthetizer frequency.

At the same time, during the investigation, apart of the false peak given by the synthetizer frequency, there was some signals (difficult to interpratete) aroung 500.4 MHz. Investigations are ongoing.

In parallel, we are checking the BPM cabling convention by using the beam to be sure about the orbit readings.

Study of signal on scope:

Yellow: Losses monitor

Green: Sum of 4 electrodes RIC2/BPM.06

Blue: Long open cable (background pickup)

Screenshot from 2023-05-31 15-14-12.png Beam stored only for 1 turn not reaching

Screenshot from 2023-05-31 15-18-05.png: Green (BPM sum) cable disconnected

Screenshot from 2023-05-31 15-19-40.png: Green (BPM sum) cable reconnected

15:30 Checking BPM polarities

16:30 Created IHM to lock position on TL/DG/BPM.02 :  Diags/BPM/lock_position_tl_bpm_02.py

16:32 reload ring recipe

Screenshot from 2023-05-31 16-35-21.png : BPM signal with current in ring

Screenshot from 2023-05-31 16-49-49_I_159_3.png

Screenshot from 2023-05-31 16-51-58_I_161_90.png

Screenshot from 2023-05-31 16-56-12_I_157_90.png

Screenshot from 2023-05-31 17-02-41_I_159_90.png

Screenshot from 2023-05-31 17-03-15_I_161_90.png

Screenshot from 2023-05-31 17-10-02_I_157_90.png

Screenshot from 2023-05-31 17-11-53_I_161_90.png

Screenshot from 2023-05-31 17-13-59_I_157_90.png : We see the markers at the two node position. Delta X = 900ps

Screenshot from 2023-05-31 17-21-18_I_157_90.png : 3ns/div

When we change the dipole current we confirm that time to come back to the BPM change...

17h25: Machine stop

Mercredi 24 j'ai fait un test sur la cavité RF :

    - Au début la LLRF étant ON alors que la cavité était OFF, est ce normale ?

    - Le moteur du plongeur était à 24.91 mm

    - J'ai donc allumé la cavité avec 0V en consigne (sans puissance), il y a tout de même 5kV je crois en résiduel au minimum.

    - J'ai mis le plongeur à 24.4mm et à 500.4MHz, attendu que la cavité se stabilise avec le LLRF

    - J'ai coupé le LLRF, et fait le changement du plongeur à 22.4mm, et ré-accorder la cavité avec la fréquence, j'ai trouvé une fréquence de l'ordre de 500.3MHz.

    - J'ai tout remis comme avant (fréquence : 500.4MHz, plongeur 24.91 et attendu que la LLRF se stabilise) et j'ai tout mis OFF, cavité et LLRF.

A confirmer qu'un delta de 2mm sur le plongeur génère un delta de fréquence de l'ordre de 100 kHz ?

The main task for today is to measure the revolution frequency without RF cavity with the spectrum analyzer.

Start-up of the machine.

After setting the previous setting, the orbit was very different. We checked the injector, the beam also was different (based on the beam images) and based on the RF plots we suspected that the timing of the laser has changed.

We changed the delays, reworked the transport but then it needed much more time to optimize the injection. We made the reseanoble storage but decided  to come back to the original settings (to be consistent in oour studies). After that, not clear why, the orbit came back to the expected values (as it was on Friday).

Start of the spectrum analyzer. Machine is set to the seetings from last Friday. Beam in the ring is not very stable. We had a few kV in the RF cavity for a short period of time.

Measurements without the RF power and one measurement with a small power (a few kV). Plots are attached. The screenshot was done for the different oribt (dipole values).  Prelimenary conclusions: At nominal lattice (with some scaling), we can keep the beam in the ring in the energy range, which corresponds to the attenuation of the RF section of 1.97-2.14 dB (nominal is 2.03 dB). This coresponds to the revolution frequency range of x30 => 500.33 - 500.47 MHz.

At this frequency, the  mean orbit changes from about ~-3 to +3 mm.

Taking into acount this freauency/orbit change (70 kHz - ~3mm), it means that to come to the nominal RF frequency of 500.02 MHz, the mean value of the orbit in radial direction should be increased by about ~18 mm. The calculations show also that to reach teh nominal frequency due to the energy change ~5-7%, the larmor radius in dipoles should be increased by ~20 mm. All this is in agreement with what we have measured today.

=> All this estimations are certainly prelimenary.

Problem with RF cavity. Mohamed tried to solve it during the day, No storing power. We need the RF cavity to continue our studies.

9:10 warm up modulator

10:30: cycling of magnets

10:20 : scan charge phase

11:00 beam in the ring

Attempt to store at 500.02 MHz

Scan RF cavity phase at frequency 500,0117Mhz for different power in cavity

Optimization of dipole current to improve storage after ramping the cavity

Scan RF cavity frequency but results are difficult to interpret

Ccl: we kill the storage (50turns) for 50kV in the RF cavity

9:30 Demarrage machine

Fin installation Cerenkov + tests MRSV

Laser alignement Cerenkov arrive jusqu'a la camera a balayage

11:00 Demarrage machine

13:30 Arret machine. On a vu du Cerenkov dans la boite du milieu du couloir mais pas au dela. Rien sur la camera en salle laser.

Apres 18h30 : prise ne main de la machine pour aller dans la LE ==> le kicker d'extraction est interlocké (abdandon) 

Essaie avec la derniere recette de l'anneau : à 159.3A le stockage n'est pas tres bon (cavité OFF)

On essai de jouer sur le plongeur pour accorder la cavité à la fréquence de révolution du paquet (voir 2 screenshot de l'oscilloscope).

La cavité à une forte influence sur le stockage, mais la forme n'est pas la même

- au nominal (24.4mm) où le faisceau semble mieux "entrer" dans l'anneau mais "meurt" plus vite.

- à 22.4 mm le faisceau semble vivre dans l'anneau plus longtemps mais est moins bien stocké. Quelle est la fréquence associé à cette valeur de plongeur ?

 * Est ce qu'il n'y a pas à creuser sur l'accord de la cavité au faisceau ? 

 * La fréquence principale de la FFT (16.68MHz) ne semble pas bouger (que ce soit avec les dipôles ou avec la cavité RF). Que représente cette valeur ? 

20h30 : machine à l'arrêt

In the morning, after the start-up pf the machine, scan phase-charge and small tuning it was possible to store the beam with the settings from previous day.

The storage was optimize withthe dipole current of 159.9 (best storage up to now). RF cqvity voltqge 20-100 kV.

Work on the orbit correction and BPM.

The the dipole current was tuned to the nominal current 159.3 A with sufficient storage. AT ~18h the RF cavity went down.

To be continued.

8:40 Start warming up, problem with PSS. It was restarted.

Problems to start and tune the RF cavity. A clear working procedure and reliable tuning should b defined to optimize the Ring comissioning progress.

Feedback for teh RF has the suspicious behavior. At motor position close to the nominal, the feedback ofsets the motor in the negative direction for 100k steps and then, comes back from negative to the requested position.

Sometimes the we lost the power in the RF cavity.

Start of the ring. RF power is ~10-30 kV and freq = 500.0202 MHz. We loaded the machine with the yesterday's setting.  Optimizattion of the storage and orbit/tune. No stored beam achived. Only a few tens of turns achieved.

We decided to ramp the RF frequency up to 100 kV. We could not tune the RF cqvity to our previous value 500.41. We found the plunger position only for 500.38 MHz, so we started to work on this frequency.

After optimization work, we have achieved the storage (see the figs attached) with a reasonable orbit.

By setting the sextupoles and optimizing the quadrupoles we achived to have the kind of clean storage, stable orbit. 

By injector optimization we reduced the betattron oscilation at the injection. From time to time, the RF section phase ans power should be corrected. The further orbit correction should be done.

The estimated tunes are  (~0.19, ~0.66).

Then, we started to go back to the nominam RF freauency 500.0202 MHz.

Tuning of the cavity. Power is 40 kV.

The difference in orbit is attached in the scrennshot. Then, after the optimization it was almost the same as this morning.

By calculating the FFT on the mixed signal with the scope (see screenshot), we found the following frequency 16.68*30 = 500.4 MHz.

Without RF power, it was not possible to measure the revolution frequency as the FFT had two-peak strucutes, which is complicated to interpratate/understand.

At the nominal frequency, no storage is achieved. We wants to measure the revolution frequency operating at 500.4 MHz. Start of the ramping the power at this frequency. Big problem to tune the RF cavity. We can not inject the power in the cavity.

=> The clear observation that the ring is more stable and the storage is possible with the frequency around 500.4 MHz. it means that the circumference normally is shorter by ~ 10 mm. Investigations arer ongoing.

9:33 Start warming up

9:45 Ducre is working on the plumbing but it shuld not affect operations

11:00 Intervention JNC pour problemes refroidissement

12:00 Start beam

12:30 Sweeping of frequencies on RF cavity in ring, found local maxima at:

-500.0441MHz

-500.0371MHz

-500.0186MHz

Ring optimisation at 500.0186MHz

Slits position: 10mm/31.5mm (no improvement) => removed

16:30 Beam stop (access by Ducre)

Modulator left on standby, laser Gated, Magnets ON

Summary of the search:

Recipe used: all_20230516_15_45_01 (LI+TL+RI, all_recipes)

Attached plot shows ring at f=500.0202MHz.

RF Cavity: 45kV, fundamental = 114276mm; Plunger 15.420mm.

We ramped the cavity up to 50kV. Going from 40kV to 50 kV decreases orbit quality => some parameters still to be optimised.

Effect seen for:

RI/PS/DP: +/- 1A kills the beam. Changes by 0.1A can improve the beam.

RF cavity phase: acceptable values are on a wide range (-20degrees => +40 degrees) still very wide. We should probably set the cavity around +10 degrees (center of the range) begore increasing the voltage

RF Frequency: we had more than 100 turns in a band of about 10kHz

No effect seeing for:

injection steerers (no change in stored beam orbit)

Suggestion:

Try to optimise the quadrupoles with current settings

Then optimise the RF cavity phase (check that manual changes and software changes have similar effects) and ramp slowly the voltage.

10:00 Machine warm up

Magnets cycling

11:00 Start machine

Health check: problems with Red Pitaya and Vacuum

11:30 Scan charge phase: Charge too high (-118pC).

Laser attenuator was at 300mm => 295mm (-95pC)

RF section phase 112°

Attenuator 1.98dB

12:10 load recipe good_20230504_13_46_27

13:00 Intervention by Mohamed to start the cavity and record data points

16:42 Some storage at 500.3600MHz, Phase -30

17:15 Some storage at 500.3072MHz at Phase -29

17:20 Stop beam

8h30 : accès casemate controlé 

==> septum et kickers OFF et cavité RF OFF

==> problème cavité RF, mux 3 défaut de communication

==> impossible d'acquité les interlocks et redémarrer la cavité.

Morning restart of machine was easy for the same parameters from day before.

Problem with network was fixed by G. Philippon, it was due to the limited number of allowed ports in the new swith that was recently replaced.

Still we cannot start RF Cavity with Jean Noel. Ampli is working, but no communication of Consigne from Tango to LLRF hardware.

14.30 Cavity on, getting power.

Frequency 500.41->500.4094, and phase manual optimisation.

Power in cavity is changing from 60 kV to 80kV for  80kV setpoint.

Saving data for postprocess. Orbit correction.

Beam is stable and stored. Orbit is positive. energy is about 50.075MeV, ring dipoles 160A. Sextupoles on.

Extraction kicker started to extract just before injection.

On a aussi testé en bougeant la position laser cela n'a pas le même effet (mouvement sur LI/BMP.01)

On a mis "OFF" les steerer du linac mais cela ne semble pas avoir eu d'effet nottable.

~9h Start of the modulator

10h Tuning of the injector with KD

11h Try to inject in the ring. Only 1-2 turns after optimization. We tried previous injector settings, the situation is the same. We retuned the injector based on our previous experience with

Isolenoid = 234 ->220 A,

Laser phase = 289 -> 288 

LIL phase = 114 -> 110 (Att = 2.04 dB)

Settings are saved.

We found that the injection kicker timing was not good (-7.19 us). We put the previous setting -7.23 us

Problem to start RF Cavity. IP adress problem . A lot of Debug with Jean Noel. Working when not connected to THomx network. Philip is informed.

Machine stay in standby till tomorrow. 

Bonjour l'énergie UV actuelle sur la cathode = 58µJ avec l'iris 1.3mm

Viktor.

Pour illustrer la fin de l'entree elog 745 d'aujourd'hui  :

(==> Saute de position du faisceau, cela n'est pas corrélé à une perte de puissance ou de changement de phase (phénomène impossible à reproduire avec l'atténuation section et/ou les phases canon et section) ==> E-log Marie pour visu saute)

ci-joint le resume du traitement des donnees du 24 et 26 avril ( = donnees stabilite)

9h : Mise en chauffe machine (frigo, chiller, modulateur, PA, Laser)

13h30 : Démarrage Machine

- Quelqu'un a changé la valeur de conversion de l'iris (1.3E10 au lieu de 1E10) ce qui donné une mauvaise taille d'iris

- Redpitaya OFF. Redémarrage des redpi 1, 2 et 4 mais la 3 est toujours inaccessible via TANGO.

- max charge 336° à peine 60 pC pour atténuateur à 430mm et énergie sortie laser 214uJ ==> intervention laser necéssaire.

- La phase Canon déconne : dérive permanente de l'IHM (actions menées : scan charge phase, utilisation de l'IHM phase ==> problème bouton scan ?) Impossible à stopper. En cliquant sur phase scan +10 ==> oscillations (-10, +10) permanente ==> Kill de la plateforme IHM est la seule solution trouvée pour stoper cela

*** Réglage machine ***

* Alignement axe mag Canon: iris [5.03mm, 2.4mm], position solénoide axe mag

* phase laser/Canon : Phase max -50° (287°)

* charge : 50pC

* Courant solénoide pour avoir min de taille sur LI/SST1 (cf. Images ==> manque une valeur intermédiaire entre 50% et 10%; ou réglage manuel) : 233A

* passage section : alignement steerer LI/STR.01 pour avoir le faisceau au milieu de l'écran TL/SST.01

==> utilisation Script alignement LI/STR.01 dans QP1 et LI/STR.02 dans QP3

* réglage énergie et mise à dispersion min en utilise le dipole (159.3A et taille min)
    - position 0mm TL/BPM.02
    - taille faisceau min avec solénoide à 220A (cf. Image)

phase section 115°, atténuation 2.05dB => image stable

* focalisation "douce" du faisceau sur TL/SST1 avec les QUAD 1 à 3 pour quad SCAN (pas de saturation) : [0, 3.3, -3.65]A (cf. image)

* comparaison taille faisceau TL/SST1 et TL/SST2 (modification du dipole pour avoir le faisceau au centre de l'écran : 159.7A soit : ~3mm) : cf. image

* Réajustement phase + atténuation section (116°, 2.08dB) : cf. Image avec solénoide 220A sans quad

* Mesure Quad Scan avec une autre valeur de solénoide (200A), réalignement steerer (axe QUAD) avec nouvelle valeur solenoide
    - cf. images TL/SST1 et TL/SST2 pour quad : [-0.6, 2.7, -3.0]A

* ratrappage attenuation et phase section (115°, 2.1dB) 

==> Saute de position du faisceau, cela n'est pas corrélé à une perte de puissance ou de changement de phase (phénomène impossible à reproduire avec l'atténuation section et/ou les phases canon et section) ==> E-log Marie pour visu saute

* On a essayer de voir jusqu'où on pouvez aller avec ces paramètres :

 - Allumage de QP4 à 7 avec les valeurs précédentes : [2 , 1.75, -4.20, 4.0] ==> faisceau visible sur TL/SST3 (gros faisceau environ au milieu), image non prise

- Allumage anneau (dipole, quad, sextu, septum, kicker inj) + steerer TL/STR.03; TL/STR.04 [-0.57, -5.14]A et [2.72, 5.14]A (ancienne valeur) + valeurs précédentes pour aimants anneau par exemple :

Kicker_inj à 9200V, et spetum à 105V ==> on fait 1 tour

Le dipole peut etre varié entre 159 et 161A sans modification significative.

RI-C1-C2/PS/SP.03/currentSetpointPM : <type 'float'> : 1.6
RI-C1/PS/QP.01/currentSetpointPM : <type 'float'> : 3.2645911407
RI-C1/PS/QP.02/currentSetpointPM : <type 'float'> : -1.67228104259
RI-C1/PS/QP.03/currentSetpointPM : <type 'float'> : -1.65228104259
RI-C1/PS/QP.04/currentSetpointPM : <type 'float'> : 3.2245911407
RI-C1/PS/QP.05/currentSetpointPM : <type 'float'> : -3.082482261
RI-C1/PS/QP.06/currentSetpointPM : <type 'float'> : 1.69918499819
RI-C1/PS/QP.07/currentSetpointPM : <type 'float'> : 5.75451558131
RI-C1/PS/QP.08/currentSetpointPM : <type 'float'> : -6.54936027749
RI-C1/PS/QP.09/currentSetpointPM : <type 'float'> : -6.50936027749
RI-C1/PS/QP.10/currentSetpointPM : <type 'float'> : 5.74451558131
RI-C1/PS/QP.11/currentSetpointPM : <type 'float'> : 1.71918499819
RI-C1/PS/QP.12/currentSetpointPM : <type 'float'> : -3.082482261
RI-C1-C2/PS/SP.01/currentSetpointPM : <type 'float'> : 2.77555756156e-17
RI-C2/PS/QP.01/currentSetpointPM : <type 'float'> : 3.2645911407
RI-C2/PS/QP.02/currentSetpointPM : <type 'float'> : -1.64228104259
RI-C2/PS/QP.03/currentSetpointPM : <type 'float'> : -1.65228104259
RI-C2/PS/QP.04/currentSetpointPM : <type 'float'> : 3.2745911407
RI-C2/PS/QP.05/currentSetpointPM : <type 'float'> : -3.102482261
RI-C2/PS/QP.06/currentSetpointPM : <type 'float'> : 1.72918499819
RI-C2/PS/QP.07/currentSetpointPM : <type 'float'> : 5.76451558131
RI-C2/PS/QP.08/currentSetpointPM : <type 'float'> : -6.51936027749
RI-C2/PS/QP.09/currentSetpointPM : <type 'float'> : -6.52936027749
RI-C2/PS/QP.10/currentSetpointPM : <type 'float'> : 5.75451558131
RI-C2/PS/QP.11/currentSetpointPM : <type 'float'> : 1.71918499819
RI-C2/PS/QP.12/currentSetpointPM : <type 'float'> : -3.092482261
RI-C1-C2/PS/SP.02/currentSetpointPM : <type 'float'> : -1.32

RI-C1/PS/STR.01-V.01/currentSetpointPM : <type 'float'> : -0.8338653312
RI-C1/PS/STR.01-H.01/currentSetpointPM : <type 'float'> : -7.78395274185
RI-C1/PS/STR.02-V.01/currentSetpointPM : <type 'float'> : -1.446080688
RI-C1/PS/STR.02-H.01/currentSetpointPM : <type 'float'> : -6.92027020625
RI-C1/PS/STR.03-V.01/currentSetpointPM : <type 'float'> : -1.9470590688
RI-C1/PS/STR.03-H.01/currentSetpointPM : <type 'float'> : 4.76568657418
RI-C1/PS/STR.04-V.01/currentSetpointPM : <type 'float'> : -1.0806466224
RI-C1/PS/STR.04-H.01/currentSetpointPM : <type 'float'> : 2.18056669408
RI-C1/PS/STR.05-V.01/currentSetpointPM : <type 'float'> : 0.1573797216
RI-C1/PS/STR.05-H.01/currentSetpointPM : <type 'float'> : -0.0906906310341
RI-C1/PS/STR.06-V.01/currentSetpointPM : <type 'float'> : 3.528684072
RI-C1/PS/STR.06-H.01/currentSetpointPM : <type 'float'> : -7.92368919352

RI-C2/PS/STR.01-V.01/currentSetpointPM : <type 'float'> : -1.6450712784
RI-C2/PS/STR.01-H.01/currentSetpointPM : <type 'float'> : -9.04236623115
RI-C2/PS/STR.02-V.01/currentSetpointPM : <type 'float'> : -0.420228576
RI-C2/PS/STR.02-H.01/currentSetpointPM : <type 'float'> : -0.865464058682
RI-C2/PS/STR.03-V.01/currentSetpointPM : <type 'float'> : 5.730764208
RI-C2/PS/STR.03-H.01/currentSetpointPM : <type 'float'> : 2.0989665994
RI-C2/PS/STR.04-V.01/currentSetpointPM : <type 'float'> : -1.837470048
RI-C2/PS/STR.04-H.01/currentSetpointPM : <type 'float'> : 2.00755778176
RI-C2/PS/STR.05-V.01/currentSetpointPM : <type 'float'> : 0.045318768
RI-C2/PS/STR.05-H.01/currentSetpointPM : <type 'float'> : -0.137610988361
RI-C2/PS/STR.06-V.01/currentSetpointPM : <type 'float'> : -0.374909808
RI-C2/PS/STR.06-H.01/currentSetpointPM : <type 'float'> : -7.71986048002

*17h45 : Arret machine

**** Programme du shift ****

- Prise de données pour contraindre le model de la lattice TL
      -- pour différentes valeur solénoide
      -- Différents réglage du Quad SCAN

- Optimisation de la procédure de démarrage et des scripts d'alignement. 

- Mesure variation Pis en fonction de l'atténuateur

9:19: Mise en chauffe

10:24 Cycling magnets

10:50 Demarrage faisceau

11:21 load recipe_recipe_LI_TL_RI_all_20230317_15_52_23.txt

Beam to RI-C2/BPM.05

Problem with injection kicker. Not triggering and DS says Charging power supply is OFF. Maher came to solve the problem (14h). Most probably this was a reason of only 1 turn during the last days.

15h Studies on the DPI and SEPT on the injection (1st BPM x-orbit). Compared to yesterday run, we see the good response on change of the DPI ans SEPT. The first BPM is at +(4-6) mm.

Without injection kicker, beam is lost after ~1 turn.

9:24 Mise en chauffe

9:30 Cyclage des aimants

11h44 Démarrage faisceau

Les positions laser sur le feedback ont changé : hor position = 4.950 et ver position = 2.351

Remise des paramètres de référence :

Laser Iris position  [H;V] : [4.90/2.42mm]

Solénoides position : Z : 3.3mm, -4.9mrad

                                 X : 0.8mm, 10.201mrad

Scan Charge Phase : Energie max = 286 degres

Solenoide : 225 A

Mesure Energie of the electron (MeV) = 50.0260 +/- 0.0027

Energy at the center of the screen (MeV) = 49.9967

Relative energy spread FWHM (%) : 0.1755

13:30 Problème allumage TL/DPi bloque le MPS

14:00 Faisceau dans EL

Sur EL/SST.01 le faisecau semble etre dans une boite qui est sensible au champ des steerers.

Deux images attachees avec EL/DPI=-6.8 et EL/DPI=-7.1

Meilleure recette pour entrer dans l'anneau :  recipe_recipe_LI_TL_RI_all_20230317_15_52_23.txt

Phase RF section 110deg

Attenuateur: 1.94dB

On a reussit a aller jusqu'a ri-C2/DG/BPM.05 mais pas BPM.06

17h32: Arret machine

1) Quad scans Isol = 155, 175, 190, 200, 220 pris avec script classique ET avec script FWHM LIMA - Taille a comparer, pour voir ... A TRAITER, resultats a suivre

2) Mesure longue de stabilite  (c'etait tres stable comme ca a l'oeil) - A TRAITER, a quantifier avec plots a suivre.