georgia.mansell@LIGO.ORG - posted 16:09, Thursday 03 February 2022 (61604)
More beam profile measurements in HAM7
Sheila, Georgia
Today we measured a few more beam profiles in HAM7 for Lee to put into his mode matching code. We took profiles in 3 locations:
- directly before ZM4
- after the beam diverter on the path to sqzt7
- right downstream of ZM2
See attached diagram for qualitative locations. For (1) and (3) we took P-SAMS voltage sweeps of ZM2, and for (2) and (3) we measured the beam size at a few different locations. The data is included below (sorry for the mix of distance units!)
1. Directly before ZM4 - single location, small ZM2 voltage sweep
d_steering_mirror_to_profiler = 135mm (+-3mm)
d_ZM4_baffle_hole_to_steering_mirror = 120mm (+-3mm)
d_zm4_mirror_to_baffle_hole = 30 mm
|
V_ZM2 [V]
|
V_SG [V]
|
13.5A1 [um]
|
13.5A2 [um]
|
D4sA1 [um]
|
D4sA2 [um]
|
|
100
|
2.74
|
3042
|
3096
|
3146
|
3180
|
|
118
|
3.0
|
2850
|
2726
|
2887
|
2770
|
|
90
|
2.61
|
3163
|
3019
|
3272
|
3238
|
2.Reflection off Beam Diverter, towards SQZT7 - beam profile measurement at single P-SAMS voltage
V_ZM2, V_ZM4, V_ZM5 = 100 V
Measured distances from beam diverter to profiler and diverter to ISI edge (HAM5 side) using tape measure. Moved the beam profiler rail between measuremenrts to get more data points.
d_rail_to_beam_diverter_1 = 42.75 inches (1085.85 mm)
d_rail_to_beam_diverter_2 = 19 inches (482.6 mm)
d_beam_diverter_to_ISI_edge = 25 inches (635 mm)
d_rail = [d_rail_1, d_rail_1 - 80 mm, d_rail_2, d_rail_2 + 80 mm]
13.5_A1 = [994, 1122, 1900, 1727]
13.5_A2 = [992, 1110, 1868, 1699]
D4S_A1 = [1041, 1237, 1999, 1859]
D4S_A2 = [1089, 1222, 2046, 1900]
3:Reflection off ZM2 - beam profile measurement and ZM2 voltage sweep
d_ZM2_to_steering_mirror = 365 mm to ZM2 +- 5mm
d_rail_to_steering_mirror = 115 mm
d_rail_inch = [0, 3]
13.5_A1 = [945, 366]
13.5_A2 = [981, 380]
D4S_A1 = [949, 369]
D4S_A2 = [993, 383]
|
V_ZM2 [V]
|
V_SG [V]
|
13.5A1 [um]
|
13.5A2 [um]
|
D4sA1 [um]
|
D4sA2 [um]
|
|
100
|
2.75
|
366
|
380
|
369
|
383
|
|
118
|
3.00
|
396
|
411
|
397
|
413
|
|
80
|
2.5
|
338
|
348
|
340
|
351
|
|
90
|
2.62
|
351
|
363
|
353
|
365
|
|
60
|
2.17
|
301
|
309
|
304
|
312
|
|
30
|
1.61
|
244
|
246
|
252
|
254
|
|
0
|
0.98
|
203
|
201
|
215
|
215
|
Images attached to this report
