- 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
This file attachment:40m.pdf contains some results for the 40m ASC sensing matrix.
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.
inline:DC_ASC_Inline.png
Figure 1. Diagram of the 40m IFO in-line arm cavity.
In-line Labels:
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. |
ETMy |
The ETM of the x-arm, ETMY. |
PDH-err |
The demodulated length control signal, C1:LSC-XARM_IN1. |
TRX |
The transmitted power of the x-arm, C1:LSC-TRX_OUT. |
inline:DC_ASC_Perp.png
Perpendicular Labels:
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. |
ETMy |
The ETM of the x-arm, ETMY. |
PDH-err |
The demodulated length control signal, C1:LSC-XARM_IN1. |
TRX |
The transmitted power of the x-arm, C1:LSC-TRX_OUT. |