GlueX TOF Meeting, August 30, 2012

GlueX TOF Meeting
Thursday, August 30, 2012
10:00 am EDT
JLab: CEBAF Center, F326

Agenda

1. Announcements
2. Review of last TOF bi-weekly meeting
3. Mechanical design
4. Prototype status
5. TDC Purchase
6. Contract Status
7. Calibration and Alignment
8. Technical Design Report contribution

Communication

Videoconference

1. ESNet: 8542553
2. EVO: EVO site
   • meeting link
   • Phone bridge ID: 13 7104

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-3Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-3Q/ .

Minutes

Present:

• FSU: Paul Eugenio, Sasha Ostrovidov, Randall Smith, Ian Winger
• JLab: Fernando Barbosa, Mark Ito (chair), Tim Whitlatch, Beni Zihlmann

Re-cap of Last Meeting

Paul summarized items discussed at the last meeting, on August 16.

• There was a short discussion of items purchased
• FSU gave an update on mini-TOF construction
• There was discussion of changing materials due to length and weight.
• Sasha presented ideas on calibration.

Electronics

TDC Purchase

Fernando reported.

• The TDCs have been ordered.
• Signal distribution issues need to be planned, in particular, additional modules need to be built by us. Hall B has prototypes of these boards but Sergey Boyarinov thinks a new design is needed.

Flash ADCs and the Prototype

Paul expressed interest in gaining experience with flash ADCs.

• FSU has a VME 64X crate with pins removed for to accomodate the serial connector on the Flash 250. With this set-up one must use the internal clock on the module or provide external clock signals. Since only one ADC is needed for this exercise, the internal clock should be fine.
• Fernando will look and see what is available.
• Production units will go to UMass in a month, he hopes that we can receive tested modules from UMass in late October. These will add to the supply.

Mini-TOF Update

Randall and Ian gave the update.

• The package of bent plates arrived from JLab, but some may not work. They were not stainless as expected. More individual plates may have to be made.
• They are making lightguides. The long versions have been made for the first time.
• PMT sleeves have been completed.
• Shield holders have been completed.
• Some more raw more materials are needed. Paul had transmitted the list to Mark. He will place the order.
• This afternoon Paul and Ian will meet to discuss the gluing fixture for assembling five paddles at once.

Calibration and Alignment

A new version of the calibration document will be distributed shortly.