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=== Elog posts ===

 * [[https://nodus.ligo.caltech.edu:8081/40m/16410|40m/16410: Vent Started/Completed]]
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 1. [[https://nodus.ligo.caltech.edu:8081/40m/16432|40m/16432: Removal of PR2 mirror]]
 2. Placing a fixed mirror on a new PR2 location.
 3. Replacing PR3 with SOS with new optic ([[https://dcc.ligo.org/LIGO-E1800089|E1800089]]).
 4. Aligning TT2, PR2 and PR3 to get beam to BS center.
 5. Set up 2-3 irises.
 6. Put in PR2 in SOS.
 7. Align the beams back to the irises.
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 1. Clear East side of BS table. Following optics need to be removed:
   * OM4-PJ
   * GRX_SM1
   * OM3
   * BSOL1
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== Part V: LO Path up to LO2 setup == == Part V: SRM Oplev setup ==
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== Part : AS Path setup == == Part VI: POY Path setup ==
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== Part : BS Path setup == == Part VII: LO Path up to LO2 setup ==
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== Part : POP Path setup == == Part VIII: AS Path setup ==
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== Part : POX Path setup ==  * Clear the ITMY table. Following optics need to be removed:
   * POYM1
   * ITMY OL1
   * ITMY OL2
  ...
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== Part : POY Path setup ==
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== Part : AS RFPD Path setup == == Part IX: BHDBS Path setup ==
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== Part : Green transmission paths ==  * Setting up LO3, LO4, BHDBS
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== Part : ITMX oplevs == == Part X: POP Path setup ==

== Part XI: POX Path setup ==

== Part XII: AS RFPD Path setup ==

== Part XIII: Green transmission paths ==

== Part XIV: ITMX oplevs ==
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== Part : ITMY oplevs == == Part XV: ITMY oplevs ==
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== Part : BS, PRM SRM oplevs == == Part XVI: Place PRM and SRM ==
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== Part : Place PRM and SRM == == Part XVII: BS, PRM oplevs ==
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== Part : Pre-pump alignment and clearance check == == Part XVIII: Pre-pump alignment and clearance check ==
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== Elog posts ==

* [[https://nodus.ligo.caltech.edu:8081/40m/16410|40m/16410: Vent Started/Completed]]

BHR Upgrade Phase I - Vent of Fall 2021

1. Venting process

Mon Oct 18th, 2021

  • Checked the main volume is isolated.
  • TP1 and TP2 were made isolated from other volumes. Stopped TP1. Closed V4 to isolate TP1 from TP2.
  • TP3 was made isolated. TP3 was stopped.
  • We wanted to vent annuli, but it was not allowed as VA6 was open. We closed VA6 and vented the annuli with VAVEE.
  • We wanted to vent the volume between VA6, V5, VM3, V7 together with TP1. So V7 was opened. This did not change the TP1 pressure (P2 = 1.7mmTorr) .
  • We wanted to connect the TP1 volume with the main volume. But this was not allowed as TP1 was not rotating. We will vent TP1 through TP2 once the vent of the main volume is done.
  • Started venting the main volume@Oct 18, 2021 9:45AM PDT
  • We started from 10mTorr/min, and increased the vent speed to 200mTorr/min, 700mTorr/min, and now it is 1Torr/min @ 20Torr
  • 280Torr @11:50AM
  • 1atm @~2PM

We wanted to vent TP1. We rerun the TP2 and tried to slowly introduce the air via TP2. But the interlock prevents the action.

Trend Screen

1.1. Elog posts

2. Part I: Optics removal on westside of BS Table

3. Part II: Relocation of TT2 and MMT1/2 alignment to TT2

4. Part III: PRC Folding mirror placement

  1. 40m/16432: Removal of PR2 mirror

  2. Placing a fixed mirror on a new PR2 location.

  3. Replacing PR3 with SOS with new optic (E1800089).

  4. Aligning TT2, PR2 and PR3 to get beam to BS center.
  5. Set up 2-3 irises.
  6. Put in PR2 in SOS.
  7. Align the beams back to the irises.

5. Part IV: SR3 replacement

  1. Clear East side of BS table. Following optics need to be removed:
    • OM4-PJ
    • GRX_SM1
    • OM3
    • BSOL1

6. Part V: SRM Oplev setup

7. Part VI: POY Path setup

8. Part VII: LO Path up to LO2 setup

9. Part VIII: AS Path setup

  • Clear the ITMY table. Following optics need to be removed:
    • POYM1
    • ITMY OL1
    • ITMY OL2
    • ..

10. Part IX: BHDBS Path setup

  • Setting up LO3, LO4, BHDBS

11. Part X: POP Path setup

12. Part XI: POX Path setup

13. Part XII: AS RFPD Path setup

14. Part XIII: Green transmission paths

15. Part XIV: ITMX oplevs

Can we push the mirrors back to keep more clearance?

16. Part XV: ITMY oplevs

17. Part XVI: Place PRM and SRM

18. Part XVII: BS, PRM oplevs

19. Part XVIII: Pre-pump alignment and clearance check

20. Pump down

vent/Fall2021 (last edited 2022-01-10 20:18:10 by AnchalguptaATligoDOTorg)