Nutsinee, Dan, Jeff K, Angus
This is a follow up on the alog17529. Below you'll find the list of violin mode frequencies we found and averaged frequencies including possible alternatives. The fiber is determined using data gathered in alog16614 (which cites alog11184, alog9359, alog11044, and alog6858). The air frequency included in the last column.
The way alternatives work is that, if you choose to use one, you have to use the next alternative as well. For instant, if you decide for 508.00075 line to be averaged violin mode for the ETMY FR, you have to use 508.176 as the ETMY FL line. Or if you were to pick 508.21725 as the ETMY FL, you have to use 508.213 as the ETMY BL. This seems a little bit confusing so I attached the original Excel file as well.
Any comments, questions, and suggestions welcome.
Ps. I don't know why alog keeps making new entries everytime I add things to the table and update the file. Sorry for the spam!
| Frequency | Average | Alternative 1 | Alternative 2 | DARM split | Alternative DARM split 1 | Alternative DARM split 2 | Test mass | Fiber | In-air Freq |
| 500.054 | 500.133 | 0.08 | ITMX | BR | 501.3 | ||||
| 500.212 | |||||||||
| 501.092 | 501.150 | 501.173 | 0.06 | 0.08 | ITMX | FR | 502.8 | ||
| 501.208 | |||||||||
| 501.254 | 501.352 | 501.329 | 0.10 | 0.12 | ITMX | BL | 501.5 | ||
| 501.450 | |||||||||
| 502.621 | 502.683 | 0.06 | ITMX | FL | 504.2 | ||||
| 502.744 | |||||||||
| 503.007 | 503.063 | 0.06 | ITMY | FR | 500.8 | ||||
| 503.119 | |||||||||
| 504.803 | 504.837 | 0.03 | ITMY | FL | 502.2 | ||||
| 504.872 | |||||||||
| 501.606 | 501.678 | 501.644 | 0.07 | 0.04 | ITMY | BR | 499.9 | ||
| 501.749 | |||||||||
| 501.682 | 501.747 | 501.780 | 0.06 | 0.03 | ITMY | BL | 501.2 | ||
| 501.811 | |||||||||
| 507.992 | 508.069 | 508.001 | 0.08 | 0.01 | ETMY | FR | 507.6 | ||
| 508.146 | |||||||||
| 508.010 | 508.108 | 508.176 | 508.217 | 0.10 | 0.03 | 0.07 | ETMY | FL | 507.9 |
| 508.206 | |||||||||
| 508.220 | 508.254 | 508.213 | 0.03 | 0.01 | ETMY | BL | 508.0 | ||
| 508.289 | |||||||||
| 508.585 | 508.623 | 0.04 | ETMY | BR | 508.1 | ||||
| 508.661 | |||||||||
| 505.587 | 505.647 | 0.06 | ETMX | BL or FR | 505.0 | ||||
| 505.707 | |||||||||
| 505.710 | 505.758 | 0.05 | ETMX | BL or FR | 505.0 | ||||
| 505.805 | |||||||||
| 506.922 | 507.041 | 507.058 | 0.12 | 0.14 | ETMX | BR or FL | 506.5 | ||
| 507.159 | |||||||||
| 507.194 | 507.293 | 507.275 | 0.10 | 0.12 | ETMX | BR or FL | 506.5 | ||
| 507.391 |
A similar study has been done by Keith Riles at LLO here.
I have been looking back at the identification of violin modes done in the past and as it seems this table is one of the latest I would like to highlight the error on the last column notice the in-air measurements are mixed between ITMX and ITMY as per: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=16614 and https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=11062.