Date: Wed, 12 Jan 2000 16:07:10 -0800 (PST)
From: Alan Weinstein <ajw@hep206.cithep.caltech.edu>
To: wea@ligo.caltech.edu, sanders@ligo.caltech.edu, barish@ligo.caltech.edu,
        stan@ligo.caltech.edu, fjr@ligo.caltech.edu, nergis@ligo.caltech.edu,
        kells_b@ligo.caltech.edu, ugolini@caltech.edu, steve@ligo.caltech.edu,
        asiri_f@ligo.caltech.edu, smith_m@ligo.caltech.edu,
        lazzarini_a@ligo.caltech.edu, hiro@ligo.caltech.edu,
        jim@ligo.caltech.edu, willems@ligo.caltech.edu, jay@ligo.caltech.edu,
        dale@ligo.caltech.edu, rolf@ligo.caltech.edu, jordan@ligo.caltech.edu,
        gustafso@ligo.caltech.edu, kriles@umich.edu, fritschel_p@ligo.mit.edu,
        weiss_r@ligo.mit.edu, dhs@ligo.mit.edu, zucker_m@ligo.mit.edu,
        kstrain@physics.gla.ac.uk
CC: ajw@hep.caltech.edu
Subject: 40m upgrade project news, 1/12/00

Dear 40m enthusiasts,

____________________________________________________________________
40m upgrade project news, 1/12/00, Alan Weinstein, ajw@caltech.edu
____________________________________________________________________

- Gary and Barry are currently putting together a 
  40m upgrade review/advisory committee.

  As soon as it is finalized, I will call a meeting;
  plan to attend, as a reviewer or a project member!

- A pair of documents has been prepared (Ugolini, Jou, Weinstein)
  describing the proposed upgrade to the 
  vacuum control system (intended for review).

  http://www.ligo.caltech.edu/~ajw/vacuum.pdf
  http://www.ligo.caltech.edu/~ajw/tedjou.pdf

  Please give us your comments!

- A document has been prepared (Weinstein, Ugolini, Vass)
  describing the proposed seismic stack rebuild
  and vacuum chamber bakeout.
  It contains many questions / uncertainties!

  http://www.ligo.caltech.edu/~ajw/stacks.pdf or .ps

  Please give us your comments!

- A document has been prepared (Weinstein)
  describing a configuration for implementing RSE
  at the 40m, establishing cavity lengths 
  and control frequencies.

  http://www.ligo.caltech.edu/~ajw/rse_lengths.pdf or .ps

  Please give us your comments!

- In November, we photographed and inventoried
  all the equipment (optics, racks, PSL, etc)
  in the 40m lab.For photos, see

  http://www.ligo.caltech.edu/~dugolini/index.html

  and for inventory, see me.
  (Requests for equipment should go to Gary, and cc me).

- On 1/10/00, Vass and Ugolini removed the south end
  test mass, and Helena Armandula looked at it 
  with a microscope in the optics test lab.
  Vass: "It was easy to find a ~3mm long, horizontal scratch. 
  It is located slightly above center of the surface. 
  This location is identical with the highly
  scattering horizontal line that we had observed 
  under resonant conditions."

  See http://www.ligo.caltech.edu/~dugolini/jpegs/SETM.jpg

  This explains some, but not all, of the problems
  encountered while trying to operate the 
  power-recycled 40m IFO.

- Fred Asiri is working with Caltech Physical Plant
  to make modifications to the 40m building,
  hopefully in early spring!
    - remove doghouse
    - patch roof of lab and north annex
    - extend north annex 
    - refurbish north annex to be used as new control room
    - remove wall between current control room and IFO room
    - electrical wiring

- Fred Asiri will manage the construction of a new 
  seismic stack for the output chamber,
  to house a signal recycling mirror for RSE.

- Mike Smith will prepare a detailed optical layout
  and baffle design for the 40m RSE configuration.
  
All of the documents mentioned above
can be clicked from the 40m upgrade web page,
http://www.ligo.caltech.edu/~ajw/40m_upgrade.html .

Thanks!  AJW