[Frost] St calibration meet? (fwd)
Patrick Collins
pcollins at jlab.org
Wed Mar 31 16:17:52 EDT 2010
What run should they be set to?
Since we have already adjusted some items, should they be left alone?
If so, what items should be left alone?
-Patrick
Franz Klein wrote:
>
> Mukesh,
> I fully agree with you! Shall we change the link to the last g9a
> constants (I used them in the beginning (2 weeks ago) - and it was
> better than the g12 as a starting point). If we do change the link, it
> should be done very soon (because I adjusted already tag2tof and st2tof
> based on the current (=g12) set of constants). RF and tagger are
> calibrated (except that for several T-counters I have +2 nsec offsets
> compared to some paddles of ST ... I'll try to come up with a different,
> more robust procedure for such 2 nsec offsets ... let's see).
>
> Greetings
> Franz
>
> On Mon, 29 Mar 2010, Mukesh Saini wrote:
>
>> Hello All,
>>
>> I just wanted to offer an opinion. Instead of copying g14 constants
>> for the ST, Constants from the later g9a period should be copied over
>> for the g9b. The timewalks and everything should be pretty much the
>> same as long as the Pedestals are properly taken care of.I am also
>> assuming PMT's have not been changed for ST and the deterioration of
>> their gains are minimal. Offsets would be different but that would be
>> true in any case and that is quickly and easily fixable. Once these
>> paddle to paddle offsets are adjusted for even one run and copied over
>> for others, ST should be more or less calibrated for the initial
>> runperiod.
>>
>> So next and the only step for the initial calibration is calibrating
>> the offsets for one run. If there is a decent run lying around, I can
>> do that and I can also let Charles know what and how and why I did that.
>>
>> Is that a proper approach and conclusion?
>>
>> Let me know,
>> Mukesh.
>>
>>
>> ----- Original Message -----
>> From: Franz Klein <fklein at jlab.org>
>> Date: Monday, March 29, 2010 8:57 pm
>> Subject: Re: St calibration meet? (fwd)
>> To: Mukesh Saini <msaini at fsu.edu>
>> Cc: Volker Crede <crede at hadron.physics.fsu.edu>, Mukesh Saini
>> <mukesh at hadron.physics.fsu.edu>, Charles Taylor <ctaylor at jlab.org>,
>> Sungkyun Park <skpark at hadron.physics.fsu.edu>
>>
>>>
>>> Thanks, Mukesh!
>>> Patrick copied the constants of the 'latest' photon run into
>>> calib_user.RunIndexg9 (i.e. they are g14 constants). However, g14
>>> had very
>>> different target and ST positions and therefore many constants were
>>> off by
>>> larger amounts. In order to get 'back' to g9 conditions, I changed
>>> all
>>> overall constants to what loos reasonable after reconstructing some
>>> runs
>>> (different constants for 62165,62185,62225,62314). Generally
>>> speaking, the
>>> time offsets for tagger, most tof paddles and some ST paddles are
>>> around
>>> zero, but the ST constants have large variations.
>>> When I ran stn_calib yesterday, I was surprised to see almost all
>>> fits
>>> with quite different slopes than before. It was only a trial ...
>>> and some
>>> tagger offsets had to be corrected by +/- 2nsec.
>>> A next run of stn_calib should use data files that were cooked last
>>> night
>>> or today.
>>>
>>> What I haven't checked is whether the pedestals are up-to-date:
>>> Chuck, can you ask Eugene about it!
>>>
>>> Greetings
>>> Franz
>>>
>>> ps. since I have very time consuming classes this semester, I'm not
>>> sure
>>> whether I can do more than tagger calibration for now (RF and
>>> tagger are
>>> largely done ... except a few T-counters).
>>>
>>> On Mon, 29 Mar 2010, Mukesh Saini wrote:
>>>
>>>> Hello All,
>>>>
>>>> Charles and I have been in communication. I told him to make sure
>>> that the Pedestals from the initial Calibration runs are in the
>>> database so he doesn't go out chasing ghosts later when he or
>>> somebody else does put them in.
>>>>
>>>> Next step would be to use the start counter calibration program
>>> "stn_calib" to create the root file and look at the histograms. As
>>> soon as Charles runs them on the new cooked files, he should send
>>> me the output root file so I and other can decide of it looks
>>> acceptable or if there are calibration plots we want that are
>>> missing. Be aware that for some of the constants entered into the
>>> g9 database, the run range specified were those of g9a. So g9b
>>> constants might just default to the out-of-date
>>> calib_user.RunIndex. Especially for ST I was careful to usually
>>> enter the proper runranges. So Timewalk's and other things might
>>> need to be copied over.
>>>>
>>>> So the next step in the process is for Charles to compile his own
>>> "stn_calib" or use the one already available in the svn build at:
>>>>
>>>> To use the svn build for these softwares first --
>>>>
>>>> source /group/clas/builds/32bit/environment32.csh
>>>>
>>>> then use my stn_calib at
>>>>
>>>> /w/hallb/clasg12/mukesh/clas/bin/stn_calib
>>>>
>>>> or the clas svn stable build
>>>>
>>>> /group/clas/builds/32bit/STABLE/build/bin/stn_calib
>>>>
>>>> on a run and produce the root file with relevant histograms. We
>>> can look at the histograms and go from there.
>>>>
>>>> If anyone has a question or need to ask something that I might be
>>> able to answer, feel free to raise the issue. I am on the FROST
>>> mailing list so I should respond soon enough.
>>>>
>>>> Take care,
>>>> Mukesh.
>>>>
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: Volker Crede <crede at hadron.physics.fsu.edu>
>>>> Date: Monday, March 29, 2010 3:37 pm
>>>> Subject: Re: St calibration meet? (fwd)
>>>> To: Mukesh Saini <mukesh at hadron.physics.fsu.edu>
>>>> Cc: Franz Klein <fklein at jlab.org>, Charles Taylor
>>> <ctaylor at jlab.org>, Volker Crede <crede at fsu.edu>, Sungkyun Park
>>> <skpark at hadron.physics.fsu.edu>>
>>>>> Mukesh,
>>>>>
>>>>> could you briefly comment on Franz' email?
>>>>>
>>>>> Volker
>>>>>
>>>>>
>>>>> ---------- Forwarded message ----------
>>>>> Date: Mon, 29 Mar 2010 13:48:02 -0400 (EDT)
>>>>> From: Franz Klein <fklein at jlab.org>
>>>>> To: ctaylor at jlab.org
>>>>> Cc: Volker Crede <crede at hadron.physics.fsu.edu>, Sungkyun Park
>>>>> <sp06k at fsu.edu>Subject: Re: St calibration meet?
>>>>>
>>>>>
>>>>> Chuck,
>>>>> I looked at the ST code yesterday but it seems that under cvs and
>>>>> svn are not
>>>>> the latest versions. Maybe Mukesh can say a word to that.
>>>>> I hope that I will have time this afternoon to check through the
>>>>> anamonhist
>>>>> files to check whether the RF & tagger times didn't change.
>>>>> My first calibrations were for 62225 and 62312/62314 and 62334 (the
>>>>> last needs
>>>>> a few T-counter adjustments).
>>>>> After I checked status and variations of offsets in anamonhist, we
>>>>> can start to
>>>>> do some serious work.
>>>>>
>>>>> Chuck, the procedure is the same for any calibration process,
>>>>> whether it's
>>>>> version 0 or for final cooking.
>>>>>
>>>>> Talk to you later
>>>>> Franz
>>>>>
>>>>> On Mon, 29 Mar 2010, ctaylor at jlab.org wrote:
>>>>>
>>>>>> Franz and Sungkyun,
>>>>>>
>>>>>> Would it be possible to meet to see how I could be of assistance?
>>>>>>
>>>>>> -Chuck
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> ===============================================================
>>>>> Franz J. Klein, Associate Professor
>>>>> CUA, Department of Physics
>>>>> Washington, DC 20064
>>>>> office: Hannan Hall 206 phone: 202-319-6190
>>>>> or: Jefferson Lab,CC F-243 phone: 757-269-6671
>>>>> ---------------------------------------------------------------
>>>>>
>>>>
>>>> Graduate Student,
>>>> Florida State University.
>>>>
>>>
>>> ===============================================================
>>> Franz J. Klein, Associate Professor
>>> CUA, Department of Physics
>>> Washington, DC 20064
>>> office: Hannan Hall 206 phone: 202-319-6190
>>> or: Jefferson Lab,CC F-243 phone: 757-269-6671
>>> ---------------------------------------------------------------
>>>
>>>
>>
>> Graduate Student,
>> Florida State University.
>>
>
> ===============================================================
> Franz J. Klein, Associate Professor
> CUA, Department of Physics
> Washington, DC 20064
> office: Hannan Hall 206 phone: 202-319-6190
> or: Jefferson Lab,CC F-243 phone: 757-269-6671
> ---------------------------------------------------------------
>
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