[Halld-offline] Offline Software Meeting Minutes, June 11, 2014
Curtis A. Meyer
cmeyer at cmu.edu
Fri Jun 13 07:06:38 EDT 2014
Thanks for the comment Richard -
I thought that these processes had shorter time scales than this. If these time scales
are indeed correct, then I would ask if the digitization of the simulated BCAL signals
is being done correctly. E.g. is all the energy being deposited within a few ns being
correctly collected into a single cluster, as our electronics would do, or are things being
kept at to fine-grained a level, and we are artificially producing the series of later hits
that WIll has been fighting, when in fact they won’t really be there??
Curtis
---------
Curtis A. Meyer MCS Associate Dean for Faculty and Graduate Affairs
Wean: (412) 268-2745 Professor of Physics
Doherty: (412) 268-3090 Carnegie Mellon University
Fax: (412) 681-0648 Pittsburgh, PA 15213
curtis.meyer at cmu.edu http://www.curtismeyer.com/
On Jun 13, 2014, at 12:04 AM, Richard Jones <richard.t.jones at uconn.edu> wrote:
> Mark and all,
>
> Sequence should be:
> pion stops
> if negative pion, captures on an atom, spirals in to s-shell, emitting X-rays below Geant cutoff
> if positive pion, undergoes elastic collisions with nuclei
> pion absorbs on nucleus and blasts out nucleons
> The time scale for this is a few ns. Which part of this is mysterious?
>
> -Richard Jones
>
>
>
> On Thu, Jun 12, 2014 at 3:24 PM, Mark Ito <marki at jlab.org> wrote:
> Folks,
>
> Find the minutes below and at
> https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_June_11,_2014#Minutes
> .
>
> -- Mark
> ________________________________________________
>
> GlueX Offline Meeting, June 11, 2014
> Minutes
>
> * CMU: Will Levine, Paul Mattione, Curtis Meyer
> * FSU: Aristeidis Tsaris
> * IU: Kei Moriya
> * JLab: Mark Ito (chair), David Lawrence, Simon Taylor
> * MIT: Justin Stevens
> * NU Sean Dobbs
> * UofR: Tegan Beattie, Zisis Papandreou
>
> Announcements
>
> * A minor-version-change release of CCDB is now available, ccdb_1.01.
> It incorporates David's recent change to treat row-wise
> one-dimensional constants sets the same as column-wise ones.
> * Data Challenge 2 REST file transfer from UConn to JLab is complete.
> All files have been archived to tape. There were issues with
> multi-stream transfers with the SRM, so only single stream was used
> throughout. The suspicion is that the problem is due to small file
> sizes. Transfers from Northwestern are next. The Computer Center
> has opened up the requisite ports.
> * Zisis commented on the state of the software getting-started
> documentation on the wiki. We all acknowledged that this is
> problem. In particular he pointed out that new students' progress
> is impeded by a lack of clear direction in installing the GlueX
> software. This must be advanced in priority by this group.
>
> Review of Minutes from the Last Meeting
>
> We went over the [24]minutes from the May 28th meeting.
> * Simon has changed the code to get the parameter for the minimum
> number of hits on a track candidate from a JANA configuration
> parameter. Formerly it was hard-wired at 6.
> * Curtis reminded us that we would like to have some kind track
> quality information, other than chi-squared, for example the number
> of "missing" hits, included in the REST output.
>
> Specifying Alternate Versions of Calibration Constants in JANA
>
> Mark led the group through [25]his wiki page, based on an email from
> Dmitry. At the last meeting Justin had asked for guidance on this
> subject.
>
> CCDB Schema Changes in Version 1.00
>
> We looked at another of Mark's [26]wiki pages, describing the
> relationship between database schema versions and software version.
> Again the presentation was based on an email from Dmitry.
>
> Reconstruction of EVIO Data
>
> David brought us up-to-date on the status of doing reconstruction with
> EVIO data derived from simulation output. See his [27]his slides for
> details. Topics covered:
> * EVIO vs. HDDM
> * Converting HDDM to EVIO
> * Translation tables
> * Configuration parameters for the rawevent plugin
> * Reading EVIO data into DANA
> * Configuration Parameters for the DAQ plugin
> * Still to do
>
> We are very close to having a functional system to go from simulated
> HDDM to EVIO to reconstruction. The only piece missing now is EVIO data
> as it will appear from the CAEN TDCs.
>
> BCAL Truth
>
> Will explained in more detail the mystery he sees in the [28]simulation
> output (scroll down to the attachment) that is likely responsible for a
> late tail in the BCAL time distributions for pions. He sees a pion
> interact in the BCAL and
>
> 3.5 ns after the pion dies, in the exact same location as the pion
> death, a proton is "born". In addition to this proton, 3 other
> protons, 1 neutron, and 1 pion are also "born" at the exact same
> moment and location.
>
> We did not come up with an explanation for this. Zisis noted that the
> output looks like it comes from GEISHA. Irina Semenova may be able to
> help us with this; Zisis will ask her about it.
>
> References
>
> 24.
> https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_May_28,_2014#Minutes
> 25.
> https://halldweb1.jlab.org/wiki/index.php/Specifying_Alternate_Versions_of_Calibration_Constants_in_JANA
> 26.
> https://halldweb1.jlab.org/wiki/index.php/CCDB_Schema_Changes_in_Version_1.00
> 27. https://halldweb1.jlab.org/wiki/images/d/d6/20140611_EVIO_in_DANA.pdf
> 28. https://mailman.jlab.org/pipermail/halld-offline/2014-May/001681.html
>
> --
> Mark M. Ito, Jefferson Lab, marki at jlab.org, (757)269-5295
>
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