Reports until 17:52, Friday 09 August 2013
H1 ISC
alexan.staley@LIGO.ORG - posted 17:52, Friday 09 August 2013 (7408)
More on Noise Budgeting

(Alexa, Kiwamu)

 

I have attached the following graphs:

 

1) The most recent noise budget produced by the ALS HIFOY model

2) Plot of all the contributing sensor noise to the IR noise before applying the CARM control  (which is why we do not see a knee at high frequency when comparing to the noise budget graph)

3) Infrared Noise assuming:

S_IR  = S_sensornoise                                      for f < UGF of CARM feedback

S_IR = UGF/f * S_sensornoise                          for f>UGF of CARM feedback

Thus, we are assuming a 1/f behavior above the UGF, which should overestimate the RMS. This graph includes the current acoustic noise and that with the acoustic noise lowered by a factor of 10 predicted by Robert for the science run.

4) Plot of RMS vs UGF of CARM feedback. This graph indicates if the acousitc noise is lowered by a factor of 10 the UGF of the CARM feedback can be increased while reaminig under the noise limit of 8Hz.

Non-image files attached to this report