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Reports until 16:09, Thursday 03 February 2022
H1 SQZ
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:

  1. directly before ZM4
  2. after the beam diverter on the path to sqzt7
  3. 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

 

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