AL Systems Meetings
Minutes & Recordings

 

7 Sep 2005

Agenda:

0)      Announcements

1)      Discussion of the SEI HAM prototype efforts (requirements, SAS exploration) [Joe Giaime]
a) Approach to evaluating HAM SAS seismic isolation [David Shoemaker]
- see http://mm.ligo.caltech.edu/aligo_systems/msg00191.html
b) Draft RFP for a HAM SAS [Riccardo DeSalvo]
- see RFP and attachments here: http://www.ligo.caltech.edu/~coyne/AL/SEI/HAM_SAS/

2)      Stable recycling cavity [Peter Fritschel]

Note: This may be a preliminary discussion to organize and prepare for a larger meeting.

3)      e2e status -- what can be studied now [Hiro Yamamoto]

see SimAdvLIGO-050907.pdf

4)      Gingin status (results from the last oversight committee meeting)

 

Time permitting:

5)      Update on Optical Layout [Dennis Coyne]

6)      RODA Status [Dennis Coyne]

7)      ICD Status [Dennis Coyne]

 

Note: The following talk:

SEI and Payload coupled dynamics (talk intended for LSC but cancelled) [Dennis Coyne]

 

28 Jul 2005

Next Meeting

11-13 Jul 2005


Minutes (pending)

 



Audio Recordings:

7/11 am (71 MB)

7/11 pm (127 MB)

7/12 am (82 MB)

7/12 pm (50 MB)

7/13 am (121 MB)

7/13 pm (143 MB)

Held a meeting at Caltech on the following Systems related design issues:

HAM isolation requirements

CDS Infrastructure & related topics:

  • Separation of processors and low noise ADCs
  • Reflective memory, do we want a faster system for the future?
  • Channel cost of slow controls if low enough, would permit the elimination of cross connects
  • Avoiding ground loops; Simple and standard electrical interfaces; Support of RFI goals in packaging
  • Timing (Szabi Marka)
  • Global architecture (Rolf Bork)
  • Slow controls (Daniel Sigg, Paul Schwinberg, Josh Myers)
  • Manufacturing and design activities at sites
  • Review of design process

9 Jun 2005

Audio Recording (98 MB)

 

28 Apr 2005

 

24 Feb 2005

 

10 Feb 2005


Minutes

 



Audio Recording (120 MB)

0) Announcements (Dennis)

NSF/OMB budget now shows AL starting with FY08 funding

Upcoming Reviews:

PSL DRR, 3/24 at LLO

SUS update DRR (& MC PDR?), April '05

COC PDR, ~May '05

1) Action Item Status (Dennis)

2) RODA status (Carol & Dennis)

3) SEI/payload coupled dynamics update (Dennis)

modal transfer functions

full transfer functions (large file!)

draft in-process memo (large file!)

3) recycling mirror dimensions (Mike S.)

4) beamsplitter dimensions (GariLynn)

5) MMT decentering & diameter (Dave R.)

6) vacuum outgassing update (Dennis)

7) Staging, Assembly and Installation Planning: next meeting (Dennis)

8) Optical Layout: twomeetings from now (Dennis & Mike S.)

9) Monthly progress tracking (Carol, All)

24 Nov 2004


Minutes

 



Audio Recording (101 MB)

0) Announcements

A call to arms for a 40m Lab DC readout experiment

Output Mode Cleaner for Initial LIGO

Need to analyze & decide on the size of the beamsplitter

1) RODA status (Carol & Dennis)

M040005-01, a revision to the CP dimensions (in signature cycle)

M040135-03, SUS/UK Scope (precursor to MOU)

M040174-00, SUS/UK Scope in Controls Prototype

M040279-03, Design work at RAL in parallel with Controls Proto. (in signature cycle)

M040283-01, Sapphire & Fused Silica Baseline Optic Sizes

2) Update on NSB & NSF AL review (David S.)

3) COC downselect decision status (David S.)

4) SEI critical design review (David S., Carol, Joe)

5) Request for "End of Construction (MREFC)" definition from all Subsystem Leaders (Carol)

6) Larger MMT optic diameter? (Dave R., Dennis)

7) Monthly progress tracking (Carol, All)

Note: The discussion on "Staging, Assembly and Installation Planning: continuation of the 10/14 telecon" has been deferred to a future meeting.

Oct 2004

cancelled

23 Sep 2004

 

0) Announcements

1) RODA status (Dennis)

2) Update on NSB/NSF AL review (David S.)

3) COC downselect decision status; date for review (David S.)

4) Alternative caging structure attachment arrangement (Dennis, Calum)

     - sketch of alternative approaches

5) Synopsis of LASTI re-planning efforts (Carol, David O.)

6) Status/feedback on plans/costs for subsystems for next fiscal year (Carol, All)

22 Jul 2004

0) Announcements:

        - Agenda/topics for the Aug LSC meeting at LHO?

1) RODA status (Dennis C.)

2) Update on NSB/NSF AL review and implications for schedule (David S.)

3) Plans/costs for subsystems for next fiscal year (Carol, All – preliminary discussion)

4) COC downselect decision status; date for review (David S.)

5) Loss in the signal recycling cavity (SURF project work) (Peter S.)

24 June 2004

0)      Announcements:
- upcoming COC downselect review (David S.)
- OSEM 2nd Review, 6/25 (Peter)
- LSC Meeting at LHO, 8/16-19 – call for Systems Topics

1)      Review of recent RODAs
- Output Mode Cleaner to be a monolithic cavity
- Split US/UK MOU into 2: quad prototype work + overall project (draft)
- Thermal Compensation of TM HR surface ROC (new scope for AOS) (pending)

2)      SEI ASI Critical Design Review synopsis (Dennis)
- presentation excerpt (4.6 MB) with assembly views
- eDrawing (11 MB)
- optical payload interface drawing to be revised

3)      Re-cap of the Mach-Zehnder discussions (Peter or Alan)
- Alan's meeting notes

4)      Other discussion or issues? Future topics?

27 May 2004

meeting minutes pending

 

audio recording

0) Announcements

- upcoming COC downselect review, nominally 6/30 (David S.)

- SEI ASI design review slipped to 6/18 (Dennis C.)

1) Review of recent RODAs

- MOUs for ACIGA & UK drafted -- format & broader context in review by Stan/Barry

2) Optical Layout update/status (Dennis C.)

3) Optical loss budget of 75 ppm round trip per arm (Peter F.)

4) Sidebands-on-sidebands issue (Peter F.)

5) Thermally compensated ITM and ETM ROC (Phil W., Mike S.)

6) Output Mode Cleaner as a short rigid cavity (Peter F.)

22 Apr 2004

0) Announcements

1) Review of recent RODAs

2) coupled SEI/SUS structural dynamics (Dennis)

3) sapphire downselect status/plan (David)

4) OSEM downselect status/plan (Peter)

5) clarification of SEI 1-10 Hz requirement (came up at the OSEM review) (Peter)

7) brainstorming on implementing a 'lock acquistion interferometer' (Peter)

25 Mar 2004

Cancelled due to proximity to LSC Meeting, 3/15-18

26 Feb 2004

 

0) Announcements

systems topics to present or discuss at the LSC meeting?

1) Beampslitter triple suspension (Norna)

see N. Robertson, "Design of Beamsplitter Suspension for Advanced LIGO, T040027-00

2) Layout update (Dennis)

22 Jan 2004

Audio Recording

22 Jan 2004

1) announcements

2) optical layout update/status including vertical to horizontal cross-coupling (Dennis C.)

3) proposed revision to the Vacuum outgassing requirements & implications (Dennis C.)

4) Record of Decision/Agreement (RODA): (Dennis C.)

a) CP in the ITM chain

b) FM & BS the same dimensions; ROC compensation via coatings

c) revised LASTI experiment plan wrt SUS

6) updates on the revised LIGO Lab R&D plan & management of the plan (David S.)

7) Schedule update M020121-E3 (Dennis C.)