Differences between revisions 9 and 10

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

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

Part IV: SR3 replacement

Clear East side of BS table

Part V: SRM Oplev setup

Part V: POY Path setup

Part VI: LO Path up to LO2 setup

Part VII: AS Path setup

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

Part VIII: BHDBS Path setup

Setting up LO3, LO4, BHDBS

Part IX: POP Path setup

Part X: POX Path setup

Part XI: AS RFPD Path setup

Part XII: Green transmission paths

Part XIII: ITMX oplevs

Can we push the mirrors back to keep more clearance?

Part XIV: ITMY oplevs

Part XV: Place PRM and SRM

Part XVI: BS, PRM oplevs

Part XVII: Pre-pump alignment and clearance check

Pump down

Elog posts

* 40m/16410: Vent Started/Completed

-  ⇤ ← Revision 9 as of 2021-10-28 18:37:53 → 
  Size: 2039
  Editor: AnchalguptaATligoDOTorg
  Comment:
+   ← Revision 10 as of 2021-10-28 19:06:04 → ⇥
  Size: 2285
  Editor: AnchalguptaATligoDOTorg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 28:
+ * Clear East side of BS table
-Line 29:
+Line 30:
-== Part V: LO Path up to LO2 setup ==
+== Part V: SRM Oplev setup ==
-Line 31:
+Line 32:
-== Part : AS Path setup ==
+== Part V: POY Path setup ==
-Line 33:
+Line 34:
-== Part : BS Path setup ==
+== Part VI: LO Path up to LO2 setup ==
-Line 35:
+Line 36:
-== Part : POP Path setup ==
+== Part VII: AS Path setup ==
-Line 37:
+Line 38:
-== Part : POX Path setup ==
+ * Clear the ITMY table. Following optics need to be removed:
   * POYM1
   * ITMY OL1
   * ITMY OL2
  ...
-Line 39:
+Line 44:
-== Part : POY Path setup ==
-Line 41:
+Line 45:
-== Part : AS RFPD Path setup ==
+== Part VIII: BHDBS Path setup ==
-Line 43:
+Line 47:
-== Part : Green transmission paths ==
+ * Setting up LO3, LO4, BHDBS
-Line 45:
+Line 49:
-== Part : ITMX oplevs ==
+== Part IX: POP Path setup ==

== Part X: POX Path setup ==

== Part XI: AS RFPD Path setup ==

== Part XII: Green transmission paths ==

== Part XIII: ITMX oplevs ==
-Line 49:
+Line 61:
-== Part : ITMY oplevs ==
+== Part XIV: ITMY oplevs ==
-Line 51:
+Line 63:
-== Part : BS, PRM SRM oplevs ==
+== Part XV: Place PRM and SRM ==
-Line 53:
+Line 65:
-== Part : Place PRM and SRM ==
+== Part XVI: BS, PRM oplevs ==
-Line 55:
+Line 67:
-== Part : Pre-pump alignment and clearance check ==
+== Part XVII: Pre-pump alignment and clearance check ==