[Ushiba, Yasui, Tamaki]
This is a continuation work from yesterday.
Summary
We did power budget measurements with what we had prepared yesterday.
The laser power values at each point are as shown in Fig 1.
The relevant PD and QPD values are also shown in Table 2 (bottom of this report).
Fig1
From this, transmissivities are as below
IFI:
IMMT1:
PRM:
As there was VIS work for PR suspensions, we couldn't measure power around REFL, so we will do it tomorrow.
Memo
When I first measured the power after IFI, there was probably a ghost beam hitting the power meter and the value was higher (it was not in the light receiving surface, but the temperature rose because of it, so the value of thermal type power meter became higher).
When we calculated the transmittance, it was strange, so we decided to measure it again and obtained the results shown in the figure above.
Table1
| Place | Power [W] | Background [W] |
| ① | 2.98 ± 0.02 | 0.01 ± 0.01 |
| ② | 2.80 ± 0.02 | 0.01 ± 0.01 |
| ③ | 2.79 ± 0.01 | 0.01 ± 0.01 |
| ④ | 2.79± 0.01 | 0.01 ± 0.01 |
| ⑤ | 0.281 ± 0.001 | -0.007 ± 0.001 |
Table2
| IMC_CAV_TRANS ① | 1286.291 | |
| MCE_TRANS_QPDA1 ① | SEG1 | -4306.882 |
| SEG2 | -9560.892 | |
| SEG3 | -9778.571 | |
| SEG4 | -4534.533 | |
| SUM | 27980.84 | |
| MCE_TRANS_QPDA2 ① | SEG1 | -4830.760 |
| SEG2 | -7353.130 | |
| SEG3 | -3796.635 | |
| SEG4 | -2849.884 | |
| SUM | 18575.48 | |
| IMMT1_TRANS_QPDA1 ② | SEG1 | -10621.50 |
| SEG2 | -7424.781 | |
| SEG3 | -3465.211 | |
| SEG4 | -3760.238 | |
| SUM | 25286.44 | |
| IMMT1_TRANS_QPDA2 ② | SEG1 | -11283.93 |
| SEG2 | -14074.58 | |
| SEG3 | -6219.06 | |
| SEG4 | -5345.05 | |
| SUM | 36943.94 | |
| ASC_POP_FORWARD_QPDA1 ⑤ | SEG1 | -348.7203 |
| SEG2 | -655.4798 | |
| SEG3 | -240.0567 | |
| SEG4 | -135.8861 | |
| SUM | 1380.142 | |
| ASC_POP_FORWARD_QPDA2 ⑤ | SEG1 | -1156.781 |
| SEG2 | -55.93481 | |
| SEG3 | -8.508447 | |
| SEG4 | -22.90711 | |
| SUM | 1244.132 | |
