GlueX TOF Meeting, May 6, 2020

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GlueX Time-of-Flight Meeting
Wednesday, May 6, 2020
10:00 am EDT
BlueJeans: 350 531 998


  1. Announcements
  2. Review of minutes from the last meeting
  3. Calibration
  4. Software Issues
  5. TOF NIM paper
  6. Action Item Recap


Present: Mark Ito (chair), Susan Schadmand, Simon Taylor, Beni Zihlmann

There is a recording of this meeting on the BlueJeans site. Use your JLab credentials to gain access.

Review of minutes from the last meeting

We went over the minutes from April 8. Beni reported that the calibrations for the last run period are completed now. Time resolutions is close to 100 ps for all areas of TOF II.


Beni presented a study of charged track extrapolation to the TOF array.

Comparison between TOF survey data and tracking with associated TOF points. The following plots shows tracking data where the dimensions in x and y are the track positions at the TOF plane based on extrapolating the tracks all the way out to the TOF. The colored shadings are the x/y position of the track at the TOF with the color indicating which TOF paddle provided the TOF point associated with the track. NO EXPLICIT TOF DATA ENTERS HERE! The horizontal lines indicate the location of the "nominal" TOF paddle positions. The profile data is the mean track position of all tracks along the paddles. AGAIN NO PADDLE DATA IS USED HERE OTHER THAN YES THE PADDLE PROVIDED THE HIT! The three large black dots indicate the location of the survey.

Shown are the data for survey points 1,2 and 3 which are along the horizontal axis between paddle 19 (last 3cm wide) and paddle 20 (first 4.5cm wide). These are above the beam hole. Q indicate the charge of the tracked particle.

The survey points are shown in the following picture


The first two plots below show the data below the beam line

Survey P19P20 Q1 run71673.gif

Survey P19P20 Q-1 run71673.gif

The second two plots below are data from above the beam line

Survey P27P28 Q1 run71673.gif

Survey P27P28 Q-1 run71673.gif

The next two plots are data from far below the beam line

Survey P7P8 Q1 run71673.gif

Survey P7P8 Q-1 run71673.gif

And last but not least the two plots with far above the beam hole for both charges

Survey P39P40 Q1 run71673.gif

Survey P39P40 Q-1 run71673.gif

Beni continues to try to understand the differences between charged track extrapolation, survey data, and the nominal TOF geometry. He will also compare with similar studies for TOF I.