= PRMI Noise budget =

{{attachment:MICHbudget.png}}

{{attachment:PRCLbudget.png}}


<<BR>>
<<BR>>
  * Noise curves to be included
     * Shot noise
     * DAC noise
     * Alignment noise
     * Up conversion noise
     * what else ?

= Measurements =
  7/Mar/2012 by KI

== Sensor in use ==

 * AS55_Q for MIHC
   * ''' Gain of whitening filter = 30 dB '''
   * ''' Demodulation phase = 17.6 deg '''
 <<BR>>
 * REFL33_I for PRCL
   * ''' Gain of whitening filter = 42 dB '''
   * ''' Demodulation phase = -38.050 deg ''' 

<<BR>>
  * ''' LO = 11065910 Hz ''' by a Marconi

== DC light ==
 || ''''' port name ''''' || ''''' DC power [mW] ''''' ||
 || AS (before the attenuation)|| 0.02 mW ||
 || AS55 || ? mW ||
 || REFL (before the attenuation)||  644 mW  ||
 || REFL11 || ? mW ||
 || REFL33 || ? mW ||
 || REFL55 || ? mW ||
 || REFL165 || ? mW ||

== Sidebands ==
 The values noted here were estimated from the OSAs at the AS and REFL ports.



== Optical gains ==
  ||<-3> ''''' MICH sensor parameters ''''' ||
  || ''' description ''' || ''' values ''' || ''' notes '''||
  || Estimated Optical gain ||  uW/m || ||
  || Measured pk-pk Michelson error signal || 1000 counts || Michelson was freely swinging||
  || Raw optical gain ||  Hm = 1.034768e+11 [counts/m] || = 4 * pi / lambda * (pk value of the error signal)||
  || Conversion loss of mixer ||  6.5 dB  ||from the spec sheet of JMS-1H  ||
  || ADC conversion ||  1638.4 counts / V || 16 bit, +/-20 V  ||
  || Trans impedance at 55 MHz || 556.3 Ohm || [[Electronics/RFPD/AS55| AS55 characterization ]] ||
  || Responsibity of diodes ||  0.8 [A/W] || from the spec sheet of CS3102 ||
  || Attenuation in the AS path  || || ||

<<BR>>
<<BR>>
  ||<-3> ''''' PRCL sensor parameters ''''' ||
  || ''' description ''' || ''' values ''' || ''' notes '''||
  || Estimated Optical gain ||   || ||
  || Measured pk-pk Michelson error signal || 1000 counts || Michelson was freely swinging||
  || Raw optical gain ||  Hp = 5.934718e+10 [counts/m] || = 4 * pi / lambda * (pk value of the error signal)||
  || Conversion loss of mixer ||  6.5 dB  ||from the spec sheet of JMS-1H  ||
  || ADC conversion ||  1638.4 counts / V || 16 bit, +/-20 V  ||
  || Trans impedance at 55 MHz || 556.3 Ohm || [[Electronics/RFPD/AS55| AS55 characterization ]] ||
  || Responsibity of diodes ||  0.8 [A/W] || from the spec sheet of CS3102 ||
  || Attenuation in the AS path  || || ||



== Servo filters ==
 {{attachment:oltf_prmi.png }}

 ||<-4> ''''' MICH servo '''''||
 || ''' description '''|| ''' values ''' || ''' notes ''' ||
 || UGF || 100 Hz || ||
 || Filters activated || FM5(10:1000) ||  ||
 || Gain || G = -5  ||  ||
 || Feedback || -0.9905 * ITMX + 1 * ITMY || via the output matrix||
 || Dewhitening filter || On || in both ITMX and ITMY ||
 || Limiter ||  off || ||
 || Time delay || 480 usec || without considering the effects from analog circuits and downsampling filters ||
 
 <<BR>>
 <<BR>>
 ||<-4> ''''' PRCL servo '''''||
 || ''' description '''|| ''' values ''' || ''' notes ''' ||
 || UGF || 100 Hz || ||
 || Filters activated || FM5(10:1000) ||  ||
 || Gain || G = - 0.04  ||  ||
 || Power Normalization || REFL33/POYDC/0.25 || via the normalization matrix ||
 || Feedback || PRM || ||
 || Dewhitening filter || On || PRM ||
 || Limiter ||  off || ||
 || Time delay || 480 usec || without considering the effects from analog circuits and downsampling filters ||
 
 
 
<<BR>>
 . Note: the following values are assumed for fitting the data
 . {{{
     ITMX  = 4.913e-09 / f2   [m/counts]
     ITMY  = 4.832e-09 / f2   [m/counts]
     PRM   = 2.022e-08 / f2  [m/counts]
}}}

 . For more details see [[Interferometer_Characterization#Calibration_of_Actuator_responses| summary of the actuators]]

== RAM effects ==
 * Is something going on ?