|
Size: 2285
Comment:
|
Size: 2661
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 21: | Line 21: |
| === Elog posts === * [[https://nodus.ligo.caltech.edu:8081/40m/16410|40m/16410: Vent Started/Completed]] |
|
| Line 27: | Line 32: |
| * [[https://nodus.ligo.caltech.edu:8081/40m/16432|40m/16432: Removal of PR2 mirror]] * Placing a fixed mirror on a new PR2 location. * Replacing PR3 with SOS with new optic ([[https://dcc.ligo.org/LIGO-E1800089|E1800089]]). * Aligning TT2, PR2 and PR3 to get beam to BS center. |
|
| Line 28: | Line 38: |
| * Clear East side of BS table | * Clear East side of BS table. Following optics need to be removed: * OM4-PJ * GRX_SM1 * OM3 * BSOL1 |
| Line 32: | Line 46: |
| == Part V: POY Path setup == | == Part VI: POY Path setup == |
| Line 34: | Line 48: |
| == Part VI: LO Path up to LO2 setup == | == Part VII: LO Path up to LO2 setup == |
| Line 36: | Line 50: |
| == Part VII: AS Path setup == | == Part VIII: AS Path setup == |
| Line 45: | Line 59: |
| == Part VIII: BHDBS Path setup == | == Part IX: BHDBS Path setup == |
| Line 49: | Line 63: |
| == Part IX: POP Path setup == | == Part X: POP Path setup == |
| Line 51: | Line 65: |
| == Part X: POX Path setup == | == Part XI: POX Path setup == |
| Line 53: | Line 67: |
| == Part XI: AS RFPD Path setup == | == Part XII: AS RFPD Path setup == |
| Line 55: | Line 69: |
| == Part XII: Green transmission paths == | == Part XIII: Green transmission paths == |
| Line 57: | Line 71: |
| == Part XIII: ITMX oplevs == | == Part XIV: ITMX oplevs == |
| Line 61: | Line 75: |
| == Part XIV: ITMY oplevs == | == Part XV: ITMY oplevs == |
| Line 63: | Line 77: |
| == Part XV: Place PRM and SRM == | == Part XVI: Place PRM and SRM == |
| Line 65: | Line 79: |
| == Part XVI: BS, PRM oplevs == | == Part XVII: BS, PRM oplevs == |
| Line 67: | Line 81: |
| == Part XVII: Pre-pump alignment and clearance check == | == Part XVIII: Pre-pump alignment and clearance check == |
| Line 70: | Line 84: |
== 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.
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
- Placing a fixed mirror on a new PR2 location.
Replacing PR3 with SOS with new optic (E1800089).
- Aligning TT2, PR2 and PR3 to get beam to BS center.
5. Part IV: SR3 replacement
- 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