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.

Vérification Pression SF6 =2.45 bar

Vérification Températeure chiller Clarinette =30 +/_ 0.1 °C (consigne 29.20°C)

Vide section sans HF @ 30 °C: In section 5.3 10-10 mbar & Out section 6.6 10-10 mbar

Impossible de mettre HV => erreur  de lecture de débit modulateur ==> intervention de Maher (redemarrage nécessaire de PC modulateur)

signaux RF mesurés :

avec Oscillo :

orange : reflechi section Prs

violet: incident section Pis

vert: refléchi Klystron Prk

jaune : incident Klystron Pik

avec la carte Redpitaya:

vert : puissance transmise dans la charge fin de section : P charge section

rouge : puissance reflechi section  Prs

blue: puissance incidente section Pis

* Reprise conditionnement 3µs & 25 Hz et faire durer le conditionnement à l'étape de la puissance nominale (att. sec = 0.1 dB correspondant à Pisection =24 MW)

* Mettre Att. sec @ 10 dB

* Augmenter progressivement HT de Alim 1000 V @ Alim 1215 V _HT 289 kV (Pik=33 MW)

* Faire baisser Att. sec progressivement

A partir de la valeur att. sec =1 dB on baisse l'att sec d'un pas de 0.1 dB

Att. sec = 0.9 dB (Pis= 20 MW) ==> vide In section 6.9 10-9 mbar & vide Out section 1.9 10-9 mbar

Att. sec = 0.5dB (Pis= 22 MW) ==> vide In section 6.6 10-9 mbar & vide Out section 3.7 10-9 mbar

13h30 : Att. sec = 0.1dB (Pis= 24 MW) ==> vide In section 5.3 10-9 mbar & vide Out section 2.6 10-9 mbar ==> voir capture ecrans RF signals jointes

16h00: Att. sec = 0.1dB (Pis= 24 MW) ==> vide In section 3.2 10-9 mbar & vide Out section 2.2 10-9 mbar ==> Au bout deux heures et demi la pression in section baisse et reste stable à 3.2 10-9 mbar quant à la pression out section  baisse légerement et reste  stable autour de 2.2 10-9 mbar . 

Fin 16h00

NB: un autre test est programmée vendredi 16/08 pour finaliser et valider le conditionnement de la section à sa puissance nominale  (Pis=24 MW) .

<p>12h10: Mise en chauffe modulateur, laser et chiller + PA</p>

<p>14h30: mesure phase relative sortie pilote/ sortie PA&nbsp; Vrms pilote, Vrms PA&nbsp; &nbsp;<strong>Sans HT dans le Klystron</strong></p>

<p>s&#39;il vous plait,&nbsp; Indiquez l&#39;heure du passage&nbsp;&nbsp;sous haute&nbsp; tension (pour voir si cela change quelque chose &agrave; aux mesures RF) MERCI</p>

<p>15h03 modulateur trig</p>

<p>Wave catchers arretes soft - Vincent les a redemarre (c&#39;est la 2eme fois) Est-vr</p>

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