[dsg-hallb_rich] [EXTERNAL] Re: d0 results for mirrors 5 and 5C

[Marco Mirazita]

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Hi Tyler,
here is 4 files to make the plots I showed at the RICH meeting last 
friday.
Yuo should copy them in the main directory where you have your data and 
run the perl script, for example:

> ./doAllPlots.pl 5C/2021-10-05/horizontal/no_ambient "" _2ms_corr

You will get one pdf per each root file and a D0Log.dat.pdf with all the 
spots in one page.
Let me know if you have troubles running it.

Marco




Il 2021-10-07 18:02 Tyler Lemon ha scritto:
> Hi Marco,
> 
>  Okay, we'll repeat the tests.
> 
>  I do have some questions, though.
> 
>  For the procedure, it says to determine the exposure time by testing
> various exposures until the maximum CCD counts is ~850. This is what
> we did with the latest measurements. If when we repeat the tests with
> 0.5-ms exposure times, and the CCD counts are significantly less than
> 850 for what we determine to be the smallest image size by eye, should
> we still continue the tests?
> 
>  Also, there is a trim potentiometer on the light source that I'm
> guessing will slightly vary the brightness of the source. Should we
> use that to slightly increase the source brightness if we are at
> significantly lower CCD counts with 0.5-ms exposure?
> 
>  Lastly (this is mainly just out of curiosity) for the tests, is there
> a reason the light source is red?
> 
>  Like you said, we can talk about it in the meeting, but I wanted to
> ask the questions now in case the answers need some thinking time.
> 
>  -Tyler
> 
> -------------------------
> 
> From: Marco Mirazita <Marco.Mirazita at lnf.infn.it>
> Sent: Thursday, October 7, 2021 11:43 AM
> To: Tyler Lemon <tlemon at jlab.org>
> Cc: dsg-hallb_rich at jlab.org <dsg-hallb_rich at jlab.org>
> Subject: Re: [dsg-hallb_rich] [EXTERNAL] Re: d0 results for mirrors 5
> and 5C
> 
> Hi Tyler,
> in your measurements you used an exposition time variable from 2 to
> 3.5
> ms, at least by reading the name of the files.
> This is definitely bigger than the value of 0.5 ms we used for the
> RICH-1 mirrors.
> I would ask you to repeat the measurement with 0.5 ms exposition time.
> There could be also some issue with the alignment, since the image on
> the CCD seems to be moving with Z.
> We can discuss about this point tomorrow at the meeting.
> I have posted my slides for tomorrow on the RICH wiki if you want to
> have a look now.
> Marco
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> dsg-hallb_rich at jlab.org
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