Intervention chiller (Maher) : maintenance nécessaire à prévoir (clé outil clignote)

Problème de fermeture casemate : bouton rouge de la grille de sortie enfoncée

11h36 Démarrage faisceau

11h42 HV is 'On'

12h52 RF Gun phase is 154 dg.; Att. sect. is 0.176 dB; Sect. Phase is 244 dg. TL/BPM02 X=-4 mm; Charges 89; 93

Linac steerers: H [1.17 -3.35]; V [-2.26 2.18]

Emittance measurements at 70 MeV

15h10 Set to 50 MeV; Gun Phase is 154 dg., Sect. Att. is 2.62 dB; Receipt from 28/11/2024 17h51

16h10 : loaded good storage for x rays from recepies to check 50 MeV . From this setting lets check back alignment in quads from the quand alignment script.

Before alignment : AL1
Str01-H01 : 2.69
Str01-V01 : -2.14
Str01-H02 : -4.46
Str01-V02 : 2.32
After alignment: AL2
Str01-H01 : 2.89
Str01-V01 : -1.92
Str01-H02 : -4.44
Str01-V02 : 2.33
But : transmission (charge) : drop by 40%
Let's do soléno scan to check transmission : Quand alignment not very good for charge transmission, see attched plots.

Let's check alignment on the section for the 2 alignments. We change the section phase by 50° and see displacement (Yag and BPM). For this, Quads should be off.

Alignement : AL2

Phase start : 217
-------------  TL -------------------
------ YAG LimaBPM Pixels -----
YAG X : 303.48206851 +/- 2.53475464631
YAG Y : 248.17574592 +/- 3.09361246552
------ YAG Max proj. Pixels -----
YAG X : 311.225 +/- 1.65056808402
YAG Y : 247.15 +/- 2.8332843133
------ BPMs en mm -----
BPM X : -0.280208425 +/- 0.0363865736831
BPM Y : 0.328087125 +/- 0.0522391011486

Phase end : 260
-------------  TL -------------------
------ YAG LimaBPM Pixels -----
YAG X : 580.056498553 +/- 3.23802401848
YAG Y : 262.888974065 +/- 4.1652343396
------ YAG Max proj. Pixels -----
YAG X : 580.5 +/- 4.28368999812
YAG Y : 257.5 +/- 3.69459064038
------ BPMs en mm -----
BPM X : 4.87663125 +/- 0.0575652671525
BPM Y : 0.096524675 +/- 0.0720854637695

Alignement : AL1

-------------  TL -------------------
------ YAG LimaBPM Pixels -----
YAG X : 262.601980531 +/- 19.0243746195
YAG Y : 332.053127301 +/- 1.57943041905
------ YAG Max proj. Pixels -----
YAG X : 281.125 +/- 2.59987980491
YAG Y : 327.075 +/- 1.9797411447
------ BPMs en mm -----
BPM X : -0.97775805 +/- 0.0424827626514
BPM Y : -1.10375235 +/- 0.0278375257903

Phase end : 260

-------------  TL -------------------
------ YAG LimaBPM Pixels -----
YAG X : 488.638304627 +/- 2.94860256378
YAG Y : 369.841993906 +/- 2.4681240712
------ YAG Max proj. Pixels -----
YAG X : 492.675 +/- 2.89298721048
YAG Y : 371.25 +/- 3.34477204006
------ BPMs en mm -----
BPM X : 3.5390905 +/- 0.0500967083465
BPM Y : -1.860907325 +/- 0.0472255884105

some tries to enter the ring, by using same recipe than last friday. But someting changed, not possible to get back to the same storage. May be beam quality has changed from last run.
--> We need to find a set of observables to be checked to get back to the same beam quality for injection !

18h30 : Tchuss