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. 

Goal of the shift: Reestablish the good storage at 500.38 and then try to optimize the storage and orbit.

Start up of the machine.

RF cavity start up by Mohamed. Water leakage. Jean-Noel will fix tomorrow mornig. Mohamed also says that aparently the sinal from ring syntetizer is a bit noisy, to be checked with Nicolas.

problem with trigger of the TL BPM. Nicola fixed the problem. The cable was broken.

Load of the machine setting from 19/05. The injection in the ring is very unstable from shot to shot due to the tuning of the cavity. Coming to 100 kV @500.38 MHz synchronized with the ring. RF cavity works stable.

Beam on TL BPM.02 drifts a lot and very fast. See screenshots.

With the previous setting, we did not get the previous orbit. After small reoptimization we received the resonable storage. Still we should work on the orbit correction.

The main idea fo this week is to prepare the beam for the search of the first X-rays.

The main idea fo this week is to prepare the beam for the search of the first X-rays.

Start machine without RF cavity. During the day several reboot of the libera.02 (TL).

Study of the dispersion. Measurements of the horizontal dispersion by changing the injector energy (RF section attenuator).

Orbit correction.

Study of the tune. Tune response with the steptune. Tune measurements.

First try to measure the horizontal beta function at the quadrupoles.

RF Cavity ON. Good storage at 50 kV 500.38 MHz. Dispersive orbit. SHould understand how to reduce it. 

Different studies on the orbit.

Observations: position at the  TL/DG/BPM.02-LIB.02/SpX drifts a lot (a few mm range) all day long. We should correct it all the time to keep the beam orbit and storage.

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.

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.

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.

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.

Shift started at 18h

With the current injector settings, it was difficult to inject.  We loaded the settings from last Friday 30/09 (19-22-04).

Principal steps:

- Correction of the one quadrupole polarity this morning

-injection tuning, observation of Turn-by-Turn-X, Turn-by-Turn-Y and Sum

-quads focusing, defocusing +-.0.5%

-iterative manual adjustments of corrctors, DPI, Septum, Kicker

-orbit correction with open line model response matrix 

- several datasets taken for further postprocessing

Beam is stored !!!!! ~400 turns (limited by the Libera response)

Stored beam, visible  more than 300 turns,  signal decay as estimated  due to Libera cutoff filters. To store more, RF cavity should be used.

Stable closed orbit!

Important milestone is achieved.

No losses at scintillator/fiber except for the injection, see oscilloscope screenshot.

Current machine settings are stored in recipe_recipe_LI_TL_RI_20221003_20_24_01.txt

Orbit is stable for more than one hour. End of the shift.

Start modulator; alims;

We cannot start machine. No e-beam. Timing laser RF? Need help of linac team. 

Kevin solved problem with shutter.

Check alignment at QP3.

Check phase of the section, go to 1.35 dB. 

Libera4 reboot.

Measure  orbit.

Try to change frequency of synthe from 500 to 500.43 resulted in the change beam position in TL BPM2, but it should not do anythyng with TL. Same shift is observed at the screen in the same position. 

Vincent tryies to understand how to interpret this behaviour.

evreything is ok

The laser shutter was closed ! Becareful the shutter state is inverted.

Il se passe des choses pendant la nuit qui mette les diags de la machine en radent :

 - Tous les BPM saturent ==> necessité de remettre la "puissance" à -10

 - Toutes les caméras étaient éteintes ==> necessité d'aller dans "DS restart" pour un forcage du redémarrage DS

==> Pourquoi nous avons cela ?

8h10 rémarrage machine chauffage klystron frigo et chiller

pB DS   calc/er_sy/rac.17-elr.01-rdp.0X.Y  (tous les DS redpy baie 17 )

Cycling ok

ready to start at 9h15
 

Sophie; Hayg peresent. Other people for ring formation  are  missing  without 

Mohamed installed powermeter in the casemate.

Sophie prepare linac.

PROBLEM: Observation: too many missed triggers from modumator. Call Vincent.Incertitude synchro: IMPORTANT solution by Vincent (more details ask Vincent):

Problem solution: change RF frequency 250000-250001 ; confirm on synchoro scope frequency sweep; change back 250000-250001; Problem solved, confirmed on scope http://192.168.229.21

Resolution d'instabilité de déclenche du modulateur:

si le signal observé sur  ICT 1 (Gun) n'apparait pas à 10Hz  (ie nBs de coups manqués sup à 1:100) => pB de synchro

pour le résoudre il faut changer la phase entre le 500MHz ri et le 33MHz ri. 

solutions:

1- changer la fréquence 500MHz ri  , +1Hz et -1Hz    (aller retour)

2- changer la fréquence du 33MHz ri  +1Hz et -1Hz    (aller retour)

3- changer la phase du 33MHz ri (0.1°)

Attention la phase injection anneau et la phase FP/ electrons peut changer

test à faire pour expliquer la perte d'énergie du faisceau.

10.43 PROBLEM no explanation of : beam energy  wrt to attenuator and section power

section 9.8 MW att 2 dB

canon 6.35 MW

Beam at TL2 for att 2dB for dipole 147.3 . Section Power 10.4MW

12.30-13.30h Lunch pause

14h restart , try to understand power vs electrons energy mismatch.

We can not proceed to ring injection at wrong electron  beam energy. Attenuator should be reduced to 1.3 , which  is not allowed by Mohamed, since section power should not exceed 11 MW. 

Check de la postion temporelle du faisceau d'électron dans la RF de la section: la position actuelle est bonne une avance de 200ns (passage de -8.2µs à -8.4µs ) de l'impulsion laser PC dans l'impulsion RF ne change pas l'energie du faisceau 

(test sur la varation de position sur SST0.2)

test Puissance dasn la secteur LIL

Pin section wattmetre sur coupleur d'entrée 10.5MW

Pout charge mesure demain...

on effectue un scan de de la phase de la section LIL avec un courant dipole de 159.3A (ie faisceau 50MHz) sur 360° pour retrouver le faisceau sur le BPM et l'ecran TL SST2   sans succes

16:00; Stop shift machine et arret machine

8h20 demararage machine

laser PC

Frifo chiller

modulateur

8h40 

chiller gun et section

magnets cycling

9h39 Meme parametre laser qu'hier, prise d'images laser

Phase charge max = 246 degres, on se place à energie max (-50 degres), charge autour de 100 pC

Transport jusqu'à TLSST1 (cf image)

Sur interface de Nicolas, le trend RF du start the beam part 1, ouvre les signaux RFs, il faudrait rajouter aussi le trend des ICTs.

Problème avec les éléments pulsés.

On passe sur des mesures sur le linac, scan des dimensions sur LISST1 : scan_dim_soleno (script LISST1_vs_soleno_v2)

Mesure d'énergie (TLSST1_steerer_energy_dark_v2) avec et sans quadrupoles

11h30 Pause

12h30 Visite des correspondants techniques du bâtiment de la DR04 faite par Jean-Noel

13h55 Reprise Passage phase canon à 188°

14h15 Réunion anneau

15h30 reprise passage phase à 187°, attenuation 1.4dB au lieu de 1.553 dB phi section = 113° au lieu de 116°

Début d'injection mais réglage de la cavité RF nécessaire

Relative Energie spread rms mesurée sans Q4 avec une focalisation non optimisée : 0.56%

Energie au centre de l'écran : 49.9967 MeV

A comparer au dernieres mesures steerers : EsteerersansquadV3 (1er essai 56.02MeV apres dipole 2eme essai 54.50 MeV dossier Esteerer_section)

17h Arret machine

Verification resistivite eau:

- 6.7Mo dans la baie 18 (alims)

- 550ko sur la voie 1 dans le local technique

- 16Mo sur la voie 2
=> verifier avec un expert avant d'allumer les elements magnetiques

13h : MO : Mise en chauffe modulateur et mise en route refroidissement

14h : Fermeture casemate, démarrage

Problème avec client 2

14h11 : Cyclage des aimants de la TL

Démarrage modulateur, Interlock vide sur le MPS

Mesure Pic environ 216mV et Prc environ 14 mV (mesure moyennée prise en fin de pulse)

Mise en route du feedback position laser

Phase de charge max = 266 degres

Iris 2 mm charge = 35 pC +/- 14 pC

Iris 1 mm charge = 10 pC +/- 14 pC

Iris 3 mm charge = 67 pC +/- 15 pC

Mesure energie faisceau, phase canon = 226 et phase section = 96

remarque: quand on sauve une recette avec IHM recette, les valeurs sauvées sont les valeurs de commande des éléments. (meme si les valeurs ne sont pas validées et effectives dans les éléments) lors du chargement des recettes nous avons eu des surprises!

14h00 : injection dans la TL avec faisceau sur TL-SST2

avec les parametres QP1=+1.6A, QP2=-4.2A, QP3 3A, tl str1V=+0.6A, listr1H-1.48A

Phase osc laser a sauté :

15h40 : acces SPR

17h30 :

le faisceau a été transporté jusqu'au YAG TL/SST3 avec un faisceau très agité sur l'écran (jitter phase laser ?)

Transport de la charge : Signaux ICT (LI (rouge), TL-Linac (Bleu) TL-avant dipole injection(Vert)

Valeurs des aimants :

demarrage modulateur 8h50

"Perle" avait ouvert les portes de l'igloo.... le clés sont récupérées... Maher fait la ronde

Les personnes allant dans les fosses nord et sud doivent laisser les portes dans la position initiale!!

IHM cycling => deux "problemes"   cyclage Ri-C1-PS-QP.05 et Ri-C2-PS-QP.02 (cyclage arreter à 12%)  impossible

Une initialisation des DS cycling et de DS alim est nécessaire pour finir le cyclage

Pression SF6 2.5mB

Gun phase Emax 127°

LI str 01 H 2.2
LI str 01 V  -1.7
Li str V   2.08
Li Str H -3.9
TL QP 1 -0.08
TL QP 2 3.4
TL QP 3 -3.4

Beam ON YAG TL1

Viktor try to optimize the alignement in the QPs 1-3 (à la main)

LI str 01 H 2.15
LI str 01 V  -1.7
Li str V   2.16
Li Str H -3.84
TL QP 1 -0.08
TL QP 2 3.4
TL QP 3 -3.4

Passage dipole 

DP0.1 159.3

Phase section 237°

beam at the midle of Yag TL2

dipole at 0

Looking at the beam position on BPM TL02 and Yag TL1

"MPS problemo à chaque fois que l'on éteind ou démarre le dipole on doit changer de mode de tir"

screen shot of beam jump (sst

arret laser loop position 11h15 => jump (11h21) not the laser loop

dipole off

11h45 pose déjeuné Vincent =>Modulator standby

What are the candidates for "noise" affecting BPM position : 

• Laser
• Magnets Power Supply
• External field (Dipoles ? Motors ?)
• RF (Phase, ampliture, temperature )
• Synchro ?

Monitoring at 10 Hz to find any correlation  :

BPMs LI/TL
Yag : BPMs
Laser : position
RF : All signals

To be

15h52 : Modulator swithed off ?? not understood why

Tomorrow all archiving will start from morning, to understand position jumps (seen on TL BPMs and Yag screen (Linac))

other variables could be important : Temperatures of RF : See attached plot, but variations seem to be low. Only Gun chiller seem to move.

We also did not see any jump in magnet powersupply currents.

faisceau... sur Li SST0.1

position laser était à 5.1 2.55 (on ne sait pas pourquoi)

mise à la nominale (5.4, 2.34)

pB synchro réapparait....

8H50

Demarrage chauffage, chiller, et cyclage aimants

TL/PS/DPI.01 en défaut resolu par un reset sur l'ATK pannel

les redpitaya étaient parametrées en defaut (comme s'il y avait eu une coupure de courant entre hier et aujourd'hui)

les waveform de la er\sy\rac.17-elr.01\RDP.03 (redpitaya 3 baie 17) sont toujours acquisent plus lentement que les autres (alors que le event ID compte comme les autres RDP vérifiers sur 1000 events ID dans ATK pannel)

alingnement laser sur PC avec courant d'oscurité

alignement du triplet linac

TL\DG\SST.02 en disfonctionne (caméra ok mais pas de faisceau sur le YAG on voit bien la mire)

alignement des quad sur la TL

Arret et redemarage des serveurs TL\DG\SST.02\CCD.01 dans ASTOR

le reglage du dipole et phase et att section

dipole 159.3

phase lil 107

Att lil 1.31dB

position centre faisceau sur TL\BPM2 X 4mm Y 0mm

redemarrage modulateur 13h30     1090V

charge faiceau

LI/DG/ICT.01 103pC

TL/DG/ICT.01 108pC

TL/DG/ICT.02 110pC

EP alumés manuellement  (reset en local )

Ri-c1/dg/BMP.05-LIB04 pas de signal (TbT ne fonctionne pas) serveur redemarré OK

quelques tour dans l'anneau (sans cavité RF)

on bouge delay kicker d'extraction de -7.97µs à -7.10µs

V kicker 6600 V => faisceau au milieu du BPM LE

sur IHM retards synchro : il faut pouvoir piloter les retards avec une précision d'une ns au moins pour les kickers

PB led allumées sur DG\EL\SST.01 

pB résolu par Nicolas et Kevin les leds EL sst.0.1 est sur le powerswitch

fisceau sur l'ecran yag ... non optimisé

RECETTE pour aller dans la LE en passant par l'anneau sauvé sous : good_20240117_17_22_41 avec Kicker d'extraction à 6150V (à ajouter dans la recette)

voir image. Il reste à optimiser le faisceau (ligne horizontal actuellement).

9H

mise en chauffe modulateur

10H modulateur OK

11H15 Phase charge max 271° laser aligné (pos H 5.780mm V 3.52mm)  Charge max (iris 1mm  40pC  iris 2mm  15pC)

col 2 198A

Redémarrage chiller section, car ca ne régulait pas

Steerer

LI-SST01-H -1.37A   -V 0.57

Quad

TL QP.01 1.6

TL QP.02 -4.2

TL QP.03 3

Energie steerer 53.2 MeV

quad scan, QP1=2.6A, QP2=-3.2A v1

quad scan v2 QP1=2.6, QP2=-4.2A

quand scan v3 m^eme chose mais en zoom

I Dipole 154A

Pas de signal sur les BPMs TL/0.2 TL/0.3 (sur ADC BPM)

correction d'orbite nécessaire avec le matching des quads

Test à la mano :

- Q1=-2.6   Q2=+4.2   Q3 =-1.0   Q4 = +1.0 Q5=+1.0 Q6=-4.17  Q7=4.87 A

ST1  V=0.0   H=0.2

ST2  V=-10.0  H=0.0

ST3  V = 0.0   H=-10.0   ( pour milieu ecran)

ST4 V = 0.0    H = 0.0

DIP=154.0 A

Le faisceau est stable sur l'écarn TL/SST3