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⇤ ← Revision 12 as of 2006-11-30 21:53:51 →
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 * Design and ASC scheme after we design one for AdvLIGO
 * Implement and test the new InGaAs, in-vac, high power, FTC WFS. The 40m WFS need not be
  . in-vac, but they should be packaged as such.
 * Measure spring stuff 		= Alignment Sensing and Controls =
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 . [[Simulink Model of 40m Optical Springs]] 		 * [[RF_ASC|RF based alignment & sensing control]]
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 This file attachment:40m.pdf contains some results for the 40m ASC sensing matrix.		  * [[Dither_ASC|Dither based alignment & sensing control]]
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The input for this calculation was taken from 40m web page: http://www.ligo.caltech.edu/~ajw/40m_upgrade.html. The loss per optic was increased from 37.5 ppm to more realistic 100 ppm.

== DC Alignment ==
Below are two diagrams which illustrate the proposed method to align the 40m IFO while it is locked. Currently the controls are done using Perl scripting.

attachment:DC_ASC_Inline.png

    . '''Figure 1'''. Diagram of the 40m IFO in-line arm cavity (XARM). The PRM and BS are omitted for clarity.

'''Labels - Figure 1:'''
|| IP_POS || Otherwise known as PZT1, located in front of the PRM. Steers the beam into the IFO. ||
|| IP_ANG || Otherwise known as PZT2, located after IP_POS and before the PRM. Also, steers the beam into the IFO. ||
|| ITMx || The ITM of the x-arm, ITMX. ||
|| ETMx || The ETM of the x-arm, ETMX. ||
|| PDH-err || The demodulated length control signal, ''C1:LSC-XARM_IN1''. ||
|| TRX || The transmitted power of the x-arm, ''C1:LSC-TRX_OUT''. ||
|| L.O. ITMx || Modulation of the ITMx in PIT or YAW using tdssine. ||
|| L.O. ETMx || Modulation of the ETMx in PIt or YAW using tdssine. ||

attachment:DC_ASC_Perp.png

    . '''Figure 2'''. Diagram of the 40m IFO perpendicular arm cavity (YARM).

'''Perpendicular Labels:'''

|| BS || Beamsplitter, steers the beam into the perpendicular arm cavity (y-arm). ||
|| ITMy || The ITM of the y-arm, ITMY. ||
|| ETMy || The ETM of the y-arm, ETMY. ||
|| PDH-err || The demodulated length control signal, ''C1:LSC-YARM_IN1''. ||
|| TRY || The transmitted power of the y-arm, ''C1:LSC-TRY_OUT''. ||
|| L.O. ITMy || Modulation of the ITMy in PIT or YAW using tdssine. ||
|| L.O. ETMy || Modulation of the ETMy in PIt or YAW using tdssine. ||		  * [[MC_WFS| MC Wave Front Sensors]]

Alignment Sensing and Controls

Alignment_Sensing_and_Control (last edited 2012-01-03 23:03:06 by localhost)