Revision as of 18:12, 19 May 2016

May 19, 2016 Drift Chamber meeting

Connection

1. Instructions for Bluejeans meeting connection
2. Meeting ID: 290664653

Headline text

1. To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.

Agenda

1. Detector updates
   • CDC update (Mike/Beni)
   • FDC update (Lubomir, Vlad)
     • Vertex reconstruction with FDC straight tracks [2],[3], [4]
     • Pattern recognition with magnetic field [5], [6],[7], [8], [9],[10]
     • Cathode Gain Calibration
2. NIM Papers
   • svn ls https://halldsvn.jlab.org/repos/trunk/publications/GlueXCDC
   • svn ls https://halldsvn.jlab.org/repos/trunk/publications/GlueXFDC
3. fADC125 meeting (Naomi, Cody, Beni) Friday's meeting minutes
4. Discussions about the format of the meeting

Minutes

Participants: Curtis, Naomi (CMU) Beni, Luke, Cody, Alexander A., Elton, Vlad, Sergey, and Lubomir (JLab).

Detector updates

CDC

- Naomi discussed results, presented at the collaboration meeting by Mike: gain variations vs straw number plot. She cannot explain the fine structure seen on the plot by the straw deformations - the correlation there is not obvious. The assumption so far is that these are temperature/low gas flow effects. To test this Naomi proposed to do cosmic measurements with increased gas flow. Beni will start increasing the flow in the CDC in small steps. We need to coordinate with the DAQ/trigger people when do we want to turn the crates on. Elton: we can turn on and use BCAL as trigger, but have in mind it usually takes several days to get it working.

- Naomi also discussed the "time-walk" correction for the CDC; time is defined as a difference b/n the threshold crossing time and the one from the f125 timing algorithm. The correction is small (1-2 ns), especially if using low threshold, so you don't have to apply it (Curtis).

FDC

- Lubomir showed distributions of vertexes reconstructed with FDC using straight tracks: z vs radius, and z vs angle between the two tracks using to find the vertex.

fADC125

- Naomi attached above minutes from the last Friday's meeting on implementing the busy signal for f125. ...

- Cody: next week will do measurements (with Sasha and others) of the signal propagation times to the TS crate, as needed for implementing the busy signal.

- ...

Discussions about the format of the meeting

- Everybody agrees we don't need this meeting every week, so we will have it every other week.

- Naomi: before the meeting Lubomir should send an e-mail asking if somebody wants to present something. There was a question if the fADC125 meeting should be part of the online meeting, for now it will stay within the tracking meeting.

- Sergey: it's better for him to get all the information about the tracking/drift chambers related issues within one meeting.

- Next meeting in four weeks from now on June 16 (Lubomir is in vacation beginning of June).