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Size: 4649
Comment:
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Size: 4399
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| Detailed Vent Plan: - recent pumpdowns * Osamu notes that ITMX is a bit off: [http://www.ldas-sw.ligo.caltech.edu/ilog/pub/ilog.cgi?group=40m&date_to_view=07/22/2005&anchor_to_scroll_to=2005:07:22:14:23:43-osamu 7/22/05] * looks like we were vented on July 26, 2005 for OSEM adjustment: [http://www.ldas-sw.ligo.caltech.edu/ilog/pub/ilog.cgi?group=40m&date_to_view=07/26/2005&anchor_to_scroll_to=2005:07:26:19:20:25-rkinney 7/26/05] [http://www.ldas-sw.ligo.caltech.edu/ilog/pub/ilog.cgi?group=40m&date_to_view=07/27/2005&anchor_to_scroll_to=2005:07:27:19:19:25-osamu 7/27/05] and were done by Aug 3 or before: [http://www.ldas-sw.ligo.caltech.edu/ilog/pub/ilog.cgi?group=40m&date_to_view=08/03/2005&anchor_to_scroll_to=2005:08:03:16:36:20-osamu 8/3/05] * our last vent was Aug 23, 2005 to adjust ETMX OSEMs [http://www.ldas-sw.ligo.caltech.edu/ilog/pub/ilog.cgi?group=40m&date_to_view=08/23/2005&anchor_to_scroll_to=2005:08:23:11:35:22-ajw 8/23/05] |
Detailed Vent Plan: |
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| * Install fixed mount fiber launch at AP. This will be like a long, IR oplev. * Verify that this fiber beam is co-linear with current darkport beam. |
* Install CrystaLaser at AP. This will be like a long, IR oplev. DONE. * Verify that this beam is co-linear with current darkport beam. DONE. -0.1) Recenter Oplevs, check that computer systems are working (testpoints, etc) |
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| 1. | 1. Four channel color scope |
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| * Measure levelness of BSC table with bubble * Measure levelness of ITMX table with bubble * place iris on OO table, using CrystaLaser beam as reference. * plase iris(es?) on BSC table, using CrystaLaser beam as reference. |
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| * secure OMC breadboard and OMMT to table. | |
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| * Remove DCPD, install second fiber launch in its place. * Install RF pickoff mirror. * Use reflected beam to lock OMC. |
* Remove DCPD, install second fiber launch in its place. Lock the OMC backwards. * Install RF pickoff mirror and next steering mirror. |
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| * Relevel the table, using the bubble and also the beam from the first fiber? * Verify alignment of fiber-fed beam through OMC, OMMT, RF pickoff mirror, to PZT2. |
* Relevel the table, using the bubble. * Verify alignment of fiber beam 2 through OMC, OMMT, RF pickoff mirror, to PZT2. |
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| * Align PZT2 to hit the PZT1 | * Align PZT2 to hit the AP steering mirror1, f-beam 2 to hit SRM and retroreflect to the OMC * Remove AP steering mirror 1, replace with TTPZT1. |
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| * Place OMCT mirror. * Now the f-beam 1, coming from the original AP table and retroreflecting from the SRM, should be . visible near the input to the OMC. |
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| * remove Thorlabs diode used for locking OMC backwards. |
Detailed Vent Plan:
-1) Preparations for vent:
- Steve will prepare baseline readings for IOOPOS, IOOANG, IPPOS and IPANG QPDs,
- all the oplev QPDs, and any/all other QPDs that are useful.
- We might want to lock the arms, and take baseline trends
- of the DC power on all the photodiodes that can be trended.
- Shall we keep the MC2 QPD on the transmitted beam,
- or move it back to the oplev beam?
- Osamu will prepare a detailed plan for the OSEM work.
- Rana will lock the arms and measure the angle-to-length couplings
- of the ITMs. If the beam is not centered horizontally on ITMX, we can think about moving it during the vent.
-0.5) Establish SRM + OO table alignment, as referenced to AP table
Install CrystaLaser at AP. This will be like a long, IR oplev. DONE.
- Verify that this beam is co-linear with current darkport beam. DONE.
-0.1) Recenter Oplevs, check that computer systems are working (testpoints, etc)
0) Fill Vacuum with Air
1) Remove Doors and Access Connectors:
- OO: ND and AC
- IO: AC
- BSC: ND and ITMY AC
- ITMY: AC
- ITMX: ND
- MC2: ?
2) Fix OSEMS on MC2, BS, PRM
Maybe wait on SRM till the end, since it is our reference for aligning the back-propagating beam from the DC PD, retroreflecting off of the SRM back to the DCPD.
Mis-align MC2 to prevent flashes?
2.5) Install half-wave plate to rotate polarization into the MC.
3) Install DC readout optics
- position electronics, wiring, and other necessary equipment near the OOC for biasing the TT PZTs,
- locking the OMC, and alignment.
- Necessary equipment includes, but is not limited to:
- PZT driver (OMC L)
- Lock-in Amp (SR830)
- Cabling (many BNCs), cross-connects for Vacuum flange
- SR560
- fibercoupled laser
- High-Voltage power supply (for TTPZT), with cabling and cross connects to power mirrors in TWO chambers.
- Power supply for DC PD
- Four channel color scope
- Measure levelness of OO table with bubble
- Measure levelness of BSC table with bubble
- Measure levelness of ITMX table with bubble
place iris on OO table, using CrystaLaser beam as reference.
plase iris(es?) on BSC table, using CrystaLaser beam as reference.
- Move OMMT assembly to OO chamber, place according to drawing.
- Place 4 spherical washers to support OMC breadboard.
- Move, and place OMC breadboard.
- Remove handle from OMC breadboard.
- secure OMC breadboard and OMMT to table.
- run wiring, establish signals from DC PDs.
- Install TTPZT1 on BSC table and TTPZT2 on OOC table
- Run wiring from BSC to ITMX. Disconnect ITMX flag picomotor wiring. and replace with TTPZT1 wiring.
- Check that both TT PZTs can be powered and biased. Simultaneously!
- Attach cable for OMC length PZT, wire up a solution to drive it. Test that it works properly.
- Remove DCPD, install second fiber launch in its place. Lock the OMC backwards.
- Install RF pickoff mirror and next steering mirror.
- Place remaining optics rougly on table, including squeezer optics.
- Measure levelness of OO optic table.
- Relevel the table, using the bubble.
- Verify alignment of fiber beam 2 through OMC, OMMT, RF pickoff mirror, to PZT2.
- Bias tip-tilt PZT2 to the middle of its range.
- Align PZT2 to hit the AP steering mirror1, f-beam 2 to hit SRM and retroreflect to the OMC
- Remove AP steering mirror 1, replace with TTPZT1.
- Bias PZT1 to middle of its range.
- Align PZT1 so beam hits center of SRM, and then through to centers of ITMX and ITMY.
- Align RF pickoff mirror so back-reflection from SRM
- can exit chamber. This beam can then be made co-linear
- with that from the first fiber, by moving a steering mirror on the
- AP table.
- Place OMCT mirror.
- Now the f-beam 1, coming from the original AP table and retroreflecting from the SRM, should be
- visible near the input to the OMC.
- Verify that OMCR and OMCT beams exit chamber.
- remove Thorlabs diode used for locking OMC backwards.
- Test that the OMMT and squeezer mirror picomotors can be controlled from the outside.
- Comission the squeezer optics.
- Relevel table again if movement occurs;
- if so, double check alignment of fiber beam to SRM and back, and that APRF, OMCR, OMCT beams exit the chamber.
4) Fix OSEMS on SRM
5) Pack up and get out.