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Entry  Sat May 9 17:01:08 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation ITMX_Loss_Map.pdfETMX_Loss_Map.pdfITMX_Phase_Map_(nm).pdfETMX_Phase_Map_(nm).pdf
    Reply  Wed May 13 15:13:11 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation ITMX_Loss_Map.pdfETMX_Loss_Map.pdf
       Reply  Thu May 14 12:21:56 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation ITMX_Loss_Map_Perturbation_Theory.pdfETMX_Loss_Map_Perturbation_Theory(1).pdf
          Reply  Thu May 14 19:00:43 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation 
             Reply  Tue May 19 15:39:04 2020, Yehonathan, Update, Loss Measurement, 40m Phase maps loss estimation Mode_power_fraction1.pdf
Message ID: 15332     Entry time: Thu May 14 12:21:56 2020     In reply to: 15329     Reply to this: 15333
Author: Yehonathan 
Type: Update 
Category: Loss Measurement 
Subject: 40m Phase maps loss estimation 

I finished calculating the X Arm loss using first-order perturbation theory. I will post the details of the calculation later.

I calculated loss maps of ITM and ETM (attachments 1,2 respectively). It's a little different than previous calculation because now both mirrors are considered and total cavity loss is calculated. The map is calculated by fixing one mirror and shifting the other one around.

 

The losin total is pretty much the same as calculated before using a different method. At the center of the mirror, the loss is 21.8ppm which is very close to the value that was calculated. 

 

Next thing is to try SIS.

Attachment 1: ITMX_Loss_Map_Perturbation_Theory.pdf  18 kB  Uploaded Thu May 14 15:13:21 2020  | Hide | Hide all
ITMX_Loss_Map_Perturbation_Theory.pdf
Attachment 2: ETMX_Loss_Map_Perturbation_Theory(1).pdf  20 kB  Uploaded Thu May 14 15:13:56 2020  | Hide | Hide all
ETMX_Loss_Map_Perturbation_Theory(1).pdf
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