Difference between revisions of "GlueX TOF Meeting, June 21, 2016"
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11:00 am EDT<br> | 11:00 am EDT<br> | ||
JLab: CEBAF Center, Room F326/327 | JLab: CEBAF Center, Room F326/327 | ||
+ | |||
+ | There is a [https://bluejeans.com/s/9UzV/ recording of this meeting] on the blueJeans site. | ||
==Agenda== | ==Agenda== | ||
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# Review of [[GlueX TOF Meeting, May 31, 2016#Minutes|minutes from the previous meeting]] | # Review of [[GlueX TOF Meeting, May 31, 2016#Minutes|minutes from the previous meeting]] | ||
# PMT Gains | # PMT Gains | ||
+ | #* Example: position of the MPV as a function of run number for various paddles <br>[[File:tofgain_plane1_paddle5.gif|200px]] Pad5 [[File:tofgain_plane1_paddle15.gif|200px]] Pad15 [[File:tofgain_plane1_paddle19.gif|200px]] Pad19<br>[[File:tofgain_plane1_paddle22.gif|200px]]Pad22 [[File:tofgain_plane2_paddle22.gif|200px]] Pad22P2 [[File:tofgain_plane2_paddle21.gif|200px]] Pad21P2 <br>[[File:tofgain_plane2_paddle22_zoom.gif|200px]] P22P2 | ||
+ | #* the overall loss in gain over the running period ranges from 5% for paddle 1 to 8% for paddle 6 to 12% for paddel 12 to 16% to paddle 18 to 22% for paddle 20. | ||
+ | #* in addition to the overall loss in gain there are substantial gain variations from run to run for some of the inner most paddles and can be identified with periods when the measured PMT current of the HV supply increased by 15 mico Amps or more due to the high luminosity. | ||
+ | #* these two behavior indicate that the PMTs were operated at too high gain causing large currents going though the PMT. | ||
+ | #* tof response of paddle 22 and paddle 21 for runs 10780 and 10783 <br>[[File:tofresponse_plane2_paddle22_run10780.gif|300px]] [[File:tofresponse_plane2_paddle21_run10780.gif|300px]] RUN10780 <br> [[File:tofresponse_plane2_paddle22_run10783.gif|300px]] [[File:tofresponse_plane2_paddle21_run10783.gif|300px]] RUN10783 | ||
+ | #* What is the difference between these two runs? The Radiator!, run 10780 had a 50um radiator, run 10783 had a 20um radiator. The beam currents were in both cases 100nA. the lifetime was 55% for run 10780 and 85% for run 10783. This means the rates were larger in run 10780! To illustrate this the scaler rate of paddle 21 and 22 of plane 1 as well as the beam current and active target a plotted during this period: <br> [[File:tofscaler_21_22_c.jpg | 400px]] <br>as can be seen during the time with thicker target the rate in paddle 22 increased while in paddle 21 it looks like saturation! | ||
+ | |||
+ | #* Note all the above data is using the integral with pedestal subtracted. | ||
# Calibration Status | # Calibration Status | ||
# NIM paper: [https://halldsvn.jlab.org/repos/trunk/publications/GlueXTOF| svn co https://halldsvn.jlab.org/repos/trunk/publications/GlueXTOF] | # NIM paper: [https://halldsvn.jlab.org/repos/trunk/publications/GlueXTOF| svn co https://halldsvn.jlab.org/repos/trunk/publications/GlueXTOF] |
Latest revision as of 13:26, 28 June 2016
GlueX Time-of-Flight Meeting
Tuesday, June 21, 2016
11:00 am EDT
JLab: CEBAF Center, Room F326/327
There is a recording of this meeting on the blueJeans site.
Agenda
- Announcements
- Review of minutes from the previous meeting
- PMT Gains
- Example: position of the MPV as a function of run number for various paddles
Pad5
Pad15
Pad19
Pad22
Pad22P2
Pad21P2
P22P2
- the overall loss in gain over the running period ranges from 5% for paddle 1 to 8% for paddle 6 to 12% for paddel 12 to 16% to paddle 18 to 22% for paddle 20.
- in addition to the overall loss in gain there are substantial gain variations from run to run for some of the inner most paddles and can be identified with periods when the measured PMT current of the HV supply increased by 15 mico Amps or more due to the high luminosity.
- these two behavior indicate that the PMTs were operated at too high gain causing large currents going though the PMT.
- tof response of paddle 22 and paddle 21 for runs 10780 and 10783
RUN10780
RUN10783
- What is the difference between these two runs? The Radiator!, run 10780 had a 50um radiator, run 10783 had a 20um radiator. The beam currents were in both cases 100nA. the lifetime was 55% for run 10780 and 85% for run 10783. This means the rates were larger in run 10780! To illustrate this the scaler rate of paddle 21 and 22 of plane 1 as well as the beam current and active target a plotted during this period:
as can be seen during the time with thicker target the rate in paddle 22 increased while in paddle 21 it looks like saturation!
- Example: position of the MPV as a function of run number for various paddles
- Note all the above data is using the integral with pedestal subtracted.
- Calibration Status
- NIM paper: svn co https://halldsvn.jlab.org/repos/trunk/publications/GlueXTOF
Communication
- The BlueJeans Meeting number is 350 531 998.
- Enter BlueJeans Meeting
Slides
Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2016
on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2016/ .