Differences between revisions 2 and 10 (spanning 8 versions)
⇤ ← Revision 2 as of 2006-09-13 22:29:10 →
Size: 1534
Editor: OsamuMiyakawa
Comment:
← Revision 10 as of 2006-09-14 00:44:23 → ⇥
Size: 4277
Editor: AlanWeinstein
Comment:
Deletions are marked like this. Additions are marked like this.
Line 2: Line 2:

- 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]
  * 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]

[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]
  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]
   * 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]


-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.
      Note that Dan already moved ITMX during the last vent,
      since it was estimated to be 6 cm off horizontally;
      but it hasn't been measured since.
Line 16: Line 44:
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.
Line 26: Line 56:
 * position electronics, wiring, and other necessary equipment near the OOC for biasing the TT PZTs,
   locking the OMC, and alignment.
Line 29: Line 61:
 * Place nipple on 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.
 * Attach cable for OMC length PZT, wire up a solution to drive it. Test that it works properly.
Line 30: Line 67:
 * Attach cable for OMC length, wire up a solution to drive it.
 * Install RF pickoff mirror. Use reflected beam to lock OMC		  * Install RF pickoff mirror.
 * Use reflected beam to lock OMC.
Line 34: Line 71:
 * 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.
Line 36: Line 75:
 * Drape cable from ITMX to BSC
Line 38: Line 76:
 * Align PZT1 so beam hits center of ITM?  * Align PZT1 so beam hits center of SRM, and then through to centers of ITMX and ITMY.
Line 42: Line 80:
Line 44: Line 81:
 * Relevel the table, using the bubble and also the beam from the first fiber?
 * Comission the squeezer optics. Relevel table again if movement occurs.		  * Verify that OMCR and OMCT beams exit chamber.
 * 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.

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]

  • 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]

[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]

  • 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]

  • 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]

-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. Note that Dan already moved ITMX during the last vent, since it was estimated to be 6 cm off horizontally; but it hasn't been measured since.

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, SRM

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 fixed mount fiber launch at AP?

  • Verify that this fiber beam is co-linear with current darkport beam.

4) *Move OMMT assembly to OO chamber, place according to drawing.

  • position electronics, wiring, and other necessary equipment near the OOC for biasing the TT PZTs,
    • locking the OMC, and alignment.
  • Place 4 spherical washers to support OMC breadboard.
  • Move, and place OMC breadboard.
  • Remove handle from OMC breadboard.
  • Place nipple on 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.
  • 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.
  • Install RF pickoff mirror.
  • Use reflected beam to lock OMC.
  • Place remaining optics rougly on table, including squeezer optics.
  • Measure levelness of OO optic table.
  • 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.
  • Bias tip-tilt PZT2 to the middle of its range.
  • Align PZT2 to hit the PZT1
  • 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.
  • Verify that OMCR and OMCT beams exit chamber.
  • 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.

5) Pack up and get out.

Detailed_Vent_Plan (last edited 2012-01-03 23:02:43 by localhost)