|
Size: 2087
Comment:
|
Size: 2117
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 22: | Line 22: |
| '''Labels - Figure 1:''' | '''In-line cavity legend - Figure 1:''' |
| Line 36: | Line 36: |
| '''Perpendicular Labels:''' | '''Perpendicular arm legend - Figure 2:''' |
- 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.
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.
In-line cavity legend - 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 arm legend - Figure 2:
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. |