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Agenda and Minutes, 30 January 2007

Agenda: Tues, 30 January 2007

This week we will start to review the Free Spectral Range paper. We'll start 
with the companion document, which, along with the code review document and 
the initial draft of the paper at: 

http://www.lsc-group.phys.uwm.edu/sbwg/review/projects.html

Please download and review if you have not done so already.
  

Minutes

+---------------------------------------------------------------------------
| 20070130-minutes.txt - minutes from the Jan 30 Stochastic Review telecon.
|
|  Author        : Warren G. Anderson (warren@gravity.phys.uwm.edu)
|
|  Last Modified : Tue Jan 30 02:00 PM 2007 M
+---------------------------------------------------------------------------

Attending: Warren, Nelson, Robert, Harry, Stuart

- Everyone has read document somewhat.
Issues:
- Calibration
  Can we extrapolate from S5 to S4?
  Can we extrapolate from < 1000Hz to fsr frequencies?
- Timing jitter not measured in S5
  Reboots can cause phase shifts
- Why is there even a result at 37.5 kHz
- This is an H1-H2 analysis - can we trust it?
- What are the lines in fig. 3?
- Will executive committee even be receptive?
- Contact calibration team.
- Use frequency modulated light?
- We will look at H1-H2 part.
- Robert will take a look at the fast channels.

Related Email

Subject: Questions about Calibration
From: Warren G Anderson 
To: Gabriela Gonzalez 
Date: 2007-01-30 15:05

Dear Gaby,

On behalf of the stochastic review committee, I would like to initiate a 
dialogue with the calibration team about calibration issues for one of the 
stochastic analyses (the free spectral range analysis) that we are reviewing. 
I'm guessing that the best way to do that would be to send an email to the 
calibration team mailing list (if there is one, and if that is permitted). Is 
there one, and is that a good way to start the dialogue, or what would you 
recommend?

Thanks,
Warren
-- 
+================[ WARREN G. ANDERSON ]====================+
| 15 Sierra Vista Terr. SW          (403) 212-1426 HOME    |
| Calgary AB, T3H-3C4, CANADA                              |
+----------------------------------------------------------+
| P.O. Box 413,                     (414) 559-5366 US CELL |
| Dept. of Physics                  (414) 229-3323 OFFICE  |
| Milwaukee WI, 53201, USA          (414) 229-5589 FAX     |
+==========================================================+

Subject: Re: Questions about Calibration
From: Gabriela Gonzalez 
To: Warren G Anderson 
Date: 2007-01-30 17:02

Hi Warren,

I think the best way is to talk with Brian, the chair of the  
Calibration Committee. He and Keita (the chair of the Calibration  
Review Committee) have set up a review committee to review the  
calibration of the fast channels used for that analysis, although I'm  
not sure the review has started yet... I am copying this message to  
both of them.

Also, you can email to the calibration committee using the list:  
calibration@relativity.phys.lsu.edu

I hope this helps!

Gaby.
  ------------------------------------------------------------
  Gabriela Gonzalez
   Associate Professor

   Department of Physics and Astronomy
   Louisiana State University
   202 Nicholson Hall
   Tower Drive
   Baton Rouge,LA 70803

   Phone: (225) 578 0468
   Email: gonzalez@lsu.edu
   http://www.phys.lsu.edu/faculty/gonzalez/


Begin forwarded message:

> From: Warren G Anderson 
> Date: January 30, 2007 4:05:40 PM CST
> To: Gabriela Gonzalez 
> Subject: Questions about Calibration
>
> Dear Gaby,
>
> On behalf of the stochastic review committee, I would like to  
> initiate a
> dialogue with the calibration team about calibration issues for one  
> of the
> stochastic analyses (the free spectral range analysis) that we are  
> reviewing.
> I'm guessing that the best way to do that would be to send an email  
> to the
> calibration team mailing list (if there is one, and if that is  
> permitted). Is
> there one, and is that a good way to start the dialogue, or what  
> would you
> recommend?
>
> Thanks,
> Warren
> -- 
> +================[ WARREN G. ANDERSON ]====================+
> | 15 Sierra Vista Terr. SW          (403) 212-1426 HOME    |
> | Calgary AB, T3H-3C4, CANADA                              |
> +----------------------------------------------------------+
> | P.O. Box 413,                     (414) 559-5366 US CELL |
> | Dept. of Physics                  (414) 229-3323 OFFICE  |
> | Milwaukee WI, 53201, USA          (414) 229-5589 FAX     |
> +==========================================================+

Subject: Re: Questions about Calibration
From: Warren G Anderson 
To: brian@ligo-la.caltech.edu
Date: 2007-01-30 21:47

Hi Brian,

I gather that Gaby has already told you that the stochastic review committee 
is concerned about the calibration for the FSR stochastic analysis. We need 
to examine what they have done a bit more carefully, but so far, we are not 
convinced that calibration is anywhere near as certain for this analysis as 
it is at low frequencies, and we do not have a good feeling for just how 
uncertain it is. It would help us very much if we could start a dialogue with 
the calibration team to get some more expert opinions on how much the fast 
channel calibration can be trusted. 

If you have some people who are up to speed on what the Rochester group has 
done, or are willing to get up to speed, we'd love to talk to them. I'm not 
sure if having them attend the stochastic review telecon (Tue 13:00-14:00 
Pacific) or if putting it onto the agenda of your telecons and having some of 
us attend them would be better (I'd prefer the former, but I'm sure you'd 
prefer the latter). Ultimately, whatever the forum, what is important for us 
is to be able to take advantage of the expertise in your group. 

I'll be eagerly awaiting your thoughts.

Warren

On Tuesday 30 January 2007 17:02, you wrote:
> Hi Warren,
>
> I think the best way is to talk with Brian, the chair of the
> Calibration Committee. He and Keita (the chair of the Calibration
> Review Committee) have set up a review committee to review the
> calibration of the fast channels used for that analysis, although I'm
> not sure the review has started yet... I am copying this message to
> both of them.
>
> Also, you can email to the calibration committee using the list:
> calibration@relativity.phys.lsu.edu
>
> I hope this helps!
>
> Gaby.
>   ------------------------------------------------------------
>   Gabriela Gonzalez
>    Associate Professor
>
>    Department of Physics and Astronomy
>    Louisiana State University
>    202 Nicholson Hall
>    Tower Drive
>    Baton Rouge,LA 70803
>
>    Phone: (225) 578 0468
>    Email: gonzalez@lsu.edu
>    http://www.phys.lsu.edu/faculty/gonzalez/
>
> Begin forwarded message:
> > From: Warren G Anderson warren@gravity.phys.uwm.edu>
> > Date: January 30, 2007 4:05:40 PM CST
> > To: Gabriela Gonzalez 
> > Subject: Questions about Calibration
> >
> > Dear Gaby,
> >
> > On behalf of the stochastic review committee, I would like to
> > initiate a
> > dialogue with the calibration team about calibration issues for one
> > of the
> > stochastic analyses (the free spectral range analysis) that we are
> > reviewing.
> > I'm guessing that the best way to do that would be to send an email
> > to the
> > calibration team mailing list (if there is one, and if that is
> > permitted). Is
> > there one, and is that a good way to start the dialogue, or what
> > would you
> > recommend?
> >
> > Thanks,
> > Warren
> > --
> > +================[ WARREN G. ANDERSON ]====================+
> > | 15 Sierra Vista Terr. SW          (403) 212-1426 HOME    |
> > | Calgary AB, T3H-3C4, CANADA                              |
> > +----------------------------------------------------------+
> > | P.O. Box 413,                     (414) 559-5366 US CELL |
> > | Dept. of Physics                  (414) 229-3323 OFFICE  |
> > | Milwaukee WI, 53201, USA          (414) 229-5589 FAX     |
> > +==========================================================+

-- 
+================[ WARREN G. ANDERSON ]====================+
| 15 Sierra Vista Terr. SW          (403) 212-1426 HOME    |
| Calgary AB, T3H-3C4, CANADA                              |
+----------------------------------------------------------+
| P.O. Box 413,                     (414) 559-5366 US CELL |
| Dept. of Physics                  (414) 229-3323 OFFICE  |
| Milwaukee WI, 53201, USA          (414) 229-5589 FAX     |
+==========================================================+

Subject: Re: High-f calibration
From: "Brian O'Reilly"   (LIGO)
To: Lazzarini Albert , 
    warren@gravity.phys.uwm.edu
CC: Rick Savage , 
    Keita KAWABE , 
    Vuk Mandic , 
    Peter Fritschel 
Date: 2007-02-01 11:26

Hi,

  I also received a message from Warren Anderson on this, so I am 
responding to both of you together. I am
cc'ing both Rick Savage and Keita Kawabe. The latter as chair of the 
calibration review and the former as
chair of a new sub-committee formed to look into the high frequency 
calibration. This sub-committee consists of
Rick, Keita, Daniel Sigg and Malik Rakhmanov.

The committee has already been in contact with the Rochester group and 
are reviewing current documentation.
The plan is to have the S4 calibration reviewed before the March LSC 
meeting, although this obviously can depend
on many factors. Rick and Keita may wish to add information since they 
are involved in this process.

Brian
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