GlueX TOF Meeting, July 22, 2014

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GlueX Time-of-Flight Meeting
Tuesday, July 22, 2014
10:00 am EDT
JLab: CEBAF Center, F227

Agenda

  1. Announcements
  2. Review of July 17 Meeting
  3. Installation Update
  4. Meeting Schedule (all)

Communication

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2014-3Q on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2014-3Q/ .


Minutes

Present:

  • FSU: Hussein Al Ghoul, Brad Cannon, Paul Eugenio, Sasha Ostrovidov, Aristeidis Tsaris
  • JLab: Mark Ito (chair)

Installation Report

Sasha gave the report.

  • Last Friday Sasha and Aristeidis raised the voltages on all of the PMTs to their nominal values.
  • Discriminator scalar rates were recorded. Five relatively high rate channels were observed (see below).
  • Rates were measured again with the light off in the Hall. All but one of the high-rate channels returned to normal (see below).
  • The stubborn channel was put into a scope. Th big pulses at the FADC were 2 or 3 V peak. This seems too high. Further investigation is needed.
  • A quick visual inspection did not reveal the cause of the light leaks in the other three channels.
  • Paul mentioned that they will have to have access to the man-lift to get to some of these counters during the next trip. We will contact Tom Carstens about any necessary training.

TOF scalers at optimal HV. Lights in the Hall are ON.

 17:33:04 | JLED scalers in Hz averaged over 5 seconds 
-------------------------------------------------------
North 1-44:
  895.982   189.912   215.699   248.684   257.680   314.254   341.441   332.645   346.039   369.428   393.417 
  398.814   384.221   400.813   407.210   383.221   383.222   380.623   395.616   209.703   229.094   287.067 
  278.471   231.892   237.490   424.803   387.820   401.414   393.217   390.619   410.609   430.600   371.228 
  358.434   391.418   418.206   369.029   358.633   337.643   316.253   254.282   239.089   221.497  3429.808 
South 1-44:
 1480.513   211.502   224.696   258.480   284.871   355.438   320.055   321.854   347.042   359.836   540.754 
  392.822   382.026   370.832   391.022   392.822   360.636   394.421   381.827   215.902   223.096   336.244 
  306.258   253.282   228.494   447.192   387.620   474.579   618.112   365.430   394.217   412.008   367.429 
  381.622   391.818   388.819   363.046   327.261   332.859   283.280   332.459   228.903   227.503  5169.807 
Top 1-44:
  256.891   283.680   274.284   360.847   305.470   366.445   392.434   397.431   421.814   415.017   418.216 
  434.609   417.616   485.986   489.984   438.607   434.209   432.210   441.805   271.281   252.689   328.255 
  308.464   239.295   237.090   465.385   482.577   480.977   462.586   438.597   444.394   469.782  8128.036 
  458.388   412.809   396.217   411.809   386.021   368.829   308.257   307.657   250.683   241.088   295.662 
Bottom 1-44:
  232.492   248.484   303.259   318.652   396.615   343.840   391.618   384.421   384.221   451.790   438.996 
  459.386   447.190   484.573   453.387   470.779   457.785   448.789   456.186   261.277   279.069   328.046 
  314.253   251.282   252.482   452.788   487.571   489.370   498.768   549.944   481.776   550.344   515.560 
  515.360   488.373   421.204   700.074   519.558   400.214   377.624   357.833   306.857   326.048   441.994 
-------------------------------------------------------

TOF scalers at optimal HV. Lights in the Hall are OFF.

 17:30:13 | JLED scalers in Hz averaged over 5 seconds 
-------------------------------------------------------
North 1-44:
  179.880   177.082   222.851   239.840   268.621   325.783   333.378   341.373   343.571   360.560   350.367 
  395.137   357.562   421.119   408.528   377.349   377.549   387.742   393.139   206.063   231.646   294.204 
  270.620   224.051   238.042   424.118   397.935   417.522   387.542   391.540   404.331   381.946   385.544 
  372.353   392.939   358.162   363.958   370.953   319.588   313.991   270.021   234.244   219.454   180.480 
South 1-44:
  216.256   198.268   230.247   256.230   296.406   363.962   315.993   326.786   343.975   359.365   358.165 
  386.947   372.356   395.941   405.335   378.752   360.964   392.343   387.346   220.855   227.648   321.186 
  298.601   255.030   222.252   450.300   398.335   485.477   616.390   378.548   393.538   378.948   381.746 
  378.548   377.149   339.174   356.377   331.993   306.808   275.228   341.986   228.657   221.662   174.091 
Top 1-44:
  254.441   252.442   268.832   345.784   303.610   346.384   384.160   391.955   422.529   425.727   400.743 
  419.331   414.135   482.091   468.500   436.720   429.925   462.704   459.905   273.025   236.249   325.392 
  308.602   229.853   252.433   447.303   454.299   490.275   472.287   458.096   479.282   476.084  9564.255 
  440.508   434.911   403.133   385.744   385.344   366.357   296.403   304.997   269.820   230.047   291.606 
Bottom 1-44:
  234.644   218.654   306.396   319.787   403.131   334.977   379.747   375.150   392.539   465.490   437.509 
  446.103   437.307   461.091   439.706   444.902   452.097   461.291   474.482   262.824   254.030   320.385 
  306.795   244.836   253.830   436.708   463.090   512.857   511.460   554.631   507.262   545.837   501.266 
  514.058   514.458   438.908   653.565   499.268   401.133   372.752   342.772   323.984   297.002   426.316 
-------------------------------------------------------

The Next Trip

The FSU team is planning to return to JLab Tuesday of next week.

Action Items from Last Time

We ran down the questions left from last time.

  1. Ask about the status of the FADC scalars.
    • Sascha Somov says he still has some work to do on the system for the TOF. He may get to it next week.
  2. Track down the configuration file name bug.
    • Mark talked to Sergey Furletov. This is a long-standing bug in CODA (several months). The work-around for now is to change the filename.
  3. Implement scheme to avoid confusion about HV status.
    • Mark talked to Hovanes Egiyan, about this. Adding an alarm handler will not work when the IOC has died; it too depends on a working IOC. If the GUI is stuck, it will be completely non-responsive; no changes made by the user will register. The only solution at present is to re-boot the IOC which is now an expert task. Please send Hovanes email (hovanes@jlab.org) if you need to have this done.
  4. Get the splitters cabled consistently.
    • Turned out this was only a problem on a few splitters and could have been introduced by installation and testing activities.
  5. Ask about DAC value read-back capability on the FADC-250.
    • Mark spoke with Bryan Moffit. There is an existing function that will dump the DAC registers to standard output. Bryan will be working on a function that will return values to the calling routine.
  6. Ask about the status of EPICS read-out of discriminator scalars.
    • Mark spoke with Sergey Boiarinov. He has a working system for getting the scalars, but there is only a rudimentary user interface at present; integration with EPICS will be left for Hovanes. Paul has asked Brad to write a program to use Sascha O.'s existing scalar program to support continuous monitoring of the rates. Given the state of the EPICS interface, this seems like the way to go.