HAM6, Vent Master = Hugh Radkins
https://dcc.ligo.org/E1500267

APPROVED work to be done in order of importance:

Install OMC glass stray light baffle assembly (Matt, Calum, Kate, Dan)

Install in-vac accelerometers if available (Matt, Calum, Kate, Dan)

Acoustic coupling measurements (Robert, Hugh)

DCC Vent Documents referenced in this plan:

• E1201035-v17, "aLIGO Chamber Entry & Exit Procedures"  https://dcc.ligo.org/LIGO-E1201035
• M1100039, "Hanford Checklist - HAM Door Removal"  https://dcc.ligo.org/LIGO-M1100039
• M1300464-v4, "Procedure for preparing aLIGO IFO for pumpdown"  https://dcc.ligo.org/LIGO-M1300464

Additional Documentation:

• The OMC stray light baffle assembly is shown on D0900295
• The OMC stray light baffle assembly procedure is E1500214
• Acoustic coupling measurement details provided by Robert are found at the end of this doc*.
• Payload layout update for HAM6 E1100742

SCHEDULE

TUES, June 16, 2015

1)    Transition to LASER SAFE

2)    Turn cleanrooms on around HAM6

3)    Clean area, door flange, and cleanrooms

4)    Start staging of supplies and equipment

5)    Confirm dust monitor is working

6)    Lock HEPI

WED, June 17, 2015

7)    Confirm purge air is on at HAM6

8)    Vent HAM6

9)    Remove door – Review and follow M1100039 “ Hanford checklist – HAM Door Removal”

10)  Entry chamber checklist items: Pick up floor CC wafers.  Take particle counter measurements and record:

11)  Perform acoustic coupling investigations

12)  SEI Lock ISI 

THUR, JUNE 18, 2015

13)  Start payload rework of ISI in prep for rebalancing after OMC baffle installation E1100742

FRI, JUNE 19, 2015

14)  Start prep of OMC stray light black glass shroud

MON, June 22, 2015

15)  Start install of OMC stray light black glass shroud as per E1500214

16)  Take particle measurements and record:

TUE, June 23, 2015

17)  Continue install of OMC baffle 

18)Take particle count measurements and record:

WED, June 24, 2015

19)  Continue install of OMC baffle 

20)  Install in-vac accelerometers if available – location TBD

21)  Take particle count measurements and record:

THUR, June 25, 2015

22)  Transition to LASER HAZARD

23)  Check alignment of beams in and out of OMC

24)  Transition to LASER SAFE

25)  Final rebalance ISI 

26)  Take particle count measurements and record:

FRI, June 26, 2015

27)  SEI test ISI

28)  OM SUS checkouts if needed (DAN)

29)  Chamber closeout – perform applicable exit checklist tasks E1201035.

30)  Put doors on, begin pump down.

·       Acoustic coupling measurement details (description from Robert):

Robert Schofield is interested in getting some vent time in HAM6 for investigating the resonance that promotes high acoustic coupling (we are only a factor of 2 above having ambient acoustic noise cause features in DARM (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=18504)).

The plan would be to tap particular structures and monitor the frequency on the GS13s or on a temporarily mounted Class-A compatible accelerometer that we normally use. If we find a candidate, we will damp it using a Class-A compatible temporary damping setup, and measure the damping using an externally mounted shaker. Then we would remove anything that we put in the chamber and turn the chamber over to the next project.