Differences between revisions 9 and 12 (spanning 3 versions)

BHR Upgrade Phase I - Vent of Fall 2021

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

Elog posts

40m/16410: Vent Started/Completed

Part I: Optics removal on westside of BS Table

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

Part III: PRC Folding mirror placement

40m/16432: Removal of PR2 mirror
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.

Part IV: SR3 replacement

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

Part V: SRM Oplev setup

Part VI: POY Path setup

Part VII: LO Path up to LO2 setup

Part VIII: AS Path setup

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

Part IX: BHDBS Path setup

Setting up LO3, LO4, BHDBS

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

Can we push the mirrors back to keep more clearance?

-  ⇤ ← Revision 9 as of 2021-10-28 18:37:53 → 
  Size: 2039
  Editor: AnchalguptaATligoDOTorg
  Comment:
+   ← Revision 12 as of 2021-10-28 20:41:52 → ⇥
  Size: 2661
  Editor: AnchalguptaATligoDOTorg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 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. Following optics need to be removed:
   * OM4-PJ
   * GRX_SM1
   * OM3
   * BSOL1
-Line 29:
+Line 44:
-== Part V: LO Path up to LO2 setup ==
+== Part V: SRM Oplev setup ==
-Line 31:
+Line 46:
-== Part : AS Path setup ==
+== Part VI: POY Path setup ==
-Line 33:
+Line 48:
-== Part : BS Path setup ==
+== Part VII: LO Path up to LO2 setup ==
-Line 35:
+Line 50:
-== Part : POP Path setup ==
+== Part VIII: AS Path setup ==
-Line 37:
+Line 52:
-== Part : POX Path setup ==
+ * Clear the ITMY table. Following optics need to be removed:
   * POYM1
   * ITMY OL1
   * ITMY OL2
  ...
-Line 39:
+Line 58:
-== Part : POY Path setup ==
-Line 41:
+Line 59:
-== Part : AS RFPD Path setup ==
+== Part IX: BHDBS Path setup ==
-Line 43:
+Line 61:
-== Part : Green transmission paths ==
+ * Setting up LO3, LO4, BHDBS
-Line 45:
+Line 63:
-== 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 ==
-Line 49:
+Line 75:
-== Part : ITMY oplevs ==
+== Part XV: ITMY oplevs ==
-Line 51:
+Line 77:
-== Part : BS, PRM SRM oplevs ==
+== Part XVI: Place PRM and SRM ==
-Line 53:
+Line 79:
-== Part : Place PRM and SRM ==
+== Part XVII: BS, PRM oplevs ==
-Line 55:
+Line 81:
-== Part : Pre-pump alignment and clearance check ==
+== Part XVIII: Pre-pump alignment and clearance check ==
-Line 58:
+Line 84:
-== Elog posts ==

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