September 24, 2014 Calibration

GlueX Calibration Meeting
Wednesday, September 24, 2014
11:00 am, EDT
JLab: CEBAF Center, F326

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Agenda

1. Announcements
2. Collaboration Meeting
3. Commissioning Planning updates
   1. CDC
   2. FDC
   3. FCAL
   4. BCAL
   5. TOF
   6. Start Counter
   7. Trigger
4. Fall 2014 Commissioning Simulations updates
5. Data Monitoring
   1. Commissioning Plan
   2. Data Monitoring Database & Histograms
6. AOB

Minutes

Attending: Sean, Amiran (NU); Mark I., Simon, Beni, Eric, Andrei S., Mike S., Mark D., Eugene, Elton, David L., Sergey F. (JLab); Curtis, Paul, Naomi (CMU); Matt (IU); Ahmed, Noemi, Tegan, Zisis (Regina); Justin (MIT); Brenden P. (UConn); Kei (ASU)

Announcements

• The latest accelerator schedule has the machine starting around Oct. 9
• David L. has written up new documentation about Online Monitoring plugins
• David also mentioned that Sergey F. has a new system for loading the DAC values onto the readout boards. It will be discussed in more detail in the online meeting in the afternoon.

Commissioning Planning updates

CDC/FDC

• Beni reported that there have been problems with the CDC DAQ since the new fADC125 firmware was installed, with a variety of problems showing up on different boards. It's unclear at this point if it's a problem with the boards or the firmware.
• The new fADC125 firmware does report pedestals - modes 1,2,3,4, and 8 are supposedly supported.

FCAL'

• John Z. is working on integrating the pi0 calibration code into a DANA plugin.
• Matt asked about the documentation for the Online_Monitoring_plugins.

BCAL

• Incremental progress is being made at Regina. Andrei and Noemi are looking at low-level calibration values, mainly with cosmic data. A long-standing confusion about cosmic rates has been lately understood.
• Will McGinley is looking at BCAL calibrations using pi0's and making progress estimating rates.

TOF

• FSU has collected 2M cosmic events. Sasha O. is working to understand these data and refine his calibration programs. There are some difficult parts to understand in the data, but this is mostly because the cosmic tracks are more vertically oriented than tracks from photon beam reactions. Photon beam data is expected to be much easier to understand. There should be enough information by now to make a good-enough global alignment of the TOF, and Sasha is pursuing this.

Start Counter

• The first version of the fADC250 DAC adjustment has been made. The characteristics of the polished paddles are different than those of the prototypes used to study calibration procedures before, so they will have to be looked at afresh, probably with photon beam data.

Interlude

• Mark I. pointed out that changing the DAC values on the fADC's is not the same as calibrating the pedestals. There was much discussion on this point. Eugene pointed out that its reasonable to call it a pedestal "adjustment".