Latest revision as of 17:02, 24 February 2017

GlueX TOF Meeting
Thursday, October 25, 2012
10:00 am EDT
JLab: CEBAF Center, F326

Agenda

Announcements
Review of last TOF bi-weekly meeting
Mechanical design
1. [MiniTOF]
2. [TOF Gluing Fixture]
3. TOF Module Wrapper
Contract status
1. PMT assessments of batch 1 [wiki]
2. Procurements
3. Change request
Calibration and Alignment
Technical Design Report contribution

Communication

Videoconference

ESNet: 8542553
EVO: EVO site
- meeting link
- Phone bridge ID: 13 7104

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2012-4Q on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2012-4Q/ .

Minutes

Present:

FSU: Paul Eugenio, Sasha Ostrovidov
JLab: Eugene Chudakov, Chuck Hutton, Mark Ito (chair),

Announcement

The second shipment of 30 PMTs has been sent from Hamamatsu. they have not yet arrived at FSU. The nominal shipment schedule is posted on this wiki.

Mechanical Design

Mini-TOF Construction

Paul reviewed his wiki page (standard GlueX username and password) showing progress and status. Photos of some of the machined parts are also shown.

TOF Gluing Fixture

Machine shop work for the gluing structure is underway. Parts for a nine-bar fixture are being made though only a five-bar version will be constructed initially. Ian Winger will start assembly next week.

TOF Module Wrapper

Paul will put together a wiki page on this item, a long rectangular channel to help wrap the scintillator. An example was shown as part of his talk at the last collaboration meeting.

Contract Status

Assessment of PMT batch 1

Sasha has been looking at the 38 PMTs received from Hamamatsu on October 5. A MySQL database has been set up to store parameters and test results for each tube. See his wiki page for details.

H showed results from gain measurements done on each tube done by measuring the position of the single-photo-electron peak. The results track the data sheet from Hamamatsu to about 5% for a given tube.

The results for quantum efficiency show the first two tubes with vastly different values (a factor of four difference). The measurement is done with a Americium source and after correction for gain, give a relative value for the cathode sensitivity between the two tubes. Sasha is checking his set-up.

FSU will send four tubes, including the two already tested, to JLab and the quantum efficiency measurement will be repeated.

Procurements

The two long-lead-time items are the scintillator and the light guide material.

scintillator The PO went out on October 3rd. since then Paul called Eljen and he expects the first-article counters to arrive on November 21.
light-guide material The order got stuck in FSU Purchasing, but was finally issued earlier this week. Ninety-two feet of acrylic bar (in four-foot sections) is expected to arrive November 5. The machine shop is set up to machine the long light-guides for the half-width counters. The first patch of acrylic will feed that process. Then they will set up for the standard light-guides.

Paul is still pursuing getting ESR material in rolls rather than in small sheets. He is putting together a specification document to explain the intended use and importance of the larger sheets.

Change request

Mark posted, on the DocDB, documents related to the TOF change request we submitted at the end of September. The schedule changes were made to facilitate tracking under the Project's earned-value management system (EVMS).

@@ Line 1: / Line 1: @@
 GlueX TOF Meeting<br>
-Thursday, September 27, 2012<br>
+Thursday, October 25, 2012<br>
 :00 am EDT<br>
 JLab: CEBAF Center, F326<br> <!-- room reservation good through 6/20/2013 -->
@@ Line 7: / Line 7: @@
 # Announcements
-# Review of [[GlueX TOF Meeting, September 13, 2012#Minutes|last TOF bi-weekly meeting]]
+# Review of [[GlueX TOF Meeting, September 27, 2012#Minutes|last TOF bi-weekly meeting]]
 # Mechanical design
-# Contract status -> EVMS status
+## [[http://hadron.physics.fsu.edu/wiki/index.php/MiniTOF MiniTOF]]
+## [[http://hadron.physics.fsu.edu/wiki/index.php/GluingStructure TOF Gluing Fixture]]
+## TOF Module Wrapper
+# Contract status
+## PMT assessments of batch 1 [[http://hadron.physics.fsu.edu/wiki/index.php/GlueX_Time-of-Flight wiki]]
+## Procurements
+## [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2109 Change request]
 # Calibration and Alignment
 # Technical Design Report contribution
@@ Line 24: / Line 30: @@
 ==Slides==
-Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2012-3Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-3Q/ .
+Talks can be deposited in the directory <code>/group/halld/www/halldweb/html/talks/2012-4Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2012-4Q/ .
 =Minutes=
@@ Line 30: / Line 36: @@
 Present:
 * '''FSU''': Paul Eugenio, Sasha Ostrovidov
-* '''JLab''': Chuck Hutton, Mark Ito (chair), Elton Smith, Tim Whitlatch, Beni Zihlmann
+* '''JLab''': Eugene Chudakov, Chuck Hutton, Mark Ito (chair),
-==Mini-TOF Construction==
+==Announcement==
-Paul reports that construction materials are coming in. There was a delay on a large steel channel, which we are getting from a company near the Lab. We had to buy a 20 foot piece though only 10 is needed.
+* The second shipment of 30 PMTs has been sent from Hamamatsu. they have not yet arrived at FSU. The [[TOF PMT Shipping schedule|nominal shipment schedule]] is posted on this wiki.
-==TOF Procurements==
+==Mechanical Design==
-* Materials are arriving for the gluing jig.
+===Mini-TOF Construction===
-* Specifications for the scintillator were sent to Eljen and Saint Gobain. Paul has only heard back from Eljen.
-* The AJ200 scintillator (new designation) is being produced at Eljen on revamped machines. We can get scintillator from them sooner than anticipated, within six weeks of order.
-* Additional quotes were requested for UVT acrylic rods. Paul found a company that can provide the same material as the vendor we have been using, but with a better delivery schedule. 240 feet can be delivered in six weeks. Two rods have been purchased from the new company. They will be evaluated. Elton suggested using a laser and visually observing the amount of scattering to do a quick comparative/qualitative evaluation with respect to the material already in hand.
-* Paul is trying again to get ESR daylighting film from 3M in long rolls rather than small sheets.
-==TOF Construction==
+Paul reviewed [http://hadron.physics.fsu.edu/wiki/index.php/MiniTOF his wiki page] (standard GlueX username and password) showing progress and status. Photos of some of the machined parts are also shown.
-* The gluing jig has been redesigned to allow gluing of nine modules at a time, with adequate spacing between modules.
+===TOF Gluing Fixture===
-* Ian Winger is working on a jig to help with smoothing the wrapping operation. A U-channel will hold the wrapping and scintillator.
-* Paul has been doing tests with RTV for mounting attaching the PMT's to the light guides. He got two types, RTV 615 and RTV 655, from Momentum Products (a spin-off of GE silicon). RTV 615 has been used at other experiments. Initial tests look good; a twenty pound weight was suspended from the far end of the PMT and the joint held. The PMT was removed with a razor blade and the surfaced cleaned up nicely with Kimwipes and silicone solvent.
-==Contract==
+Machine shop work for the [http://hadron.physics.fsu.edu/wiki/index.php/GluingStructure gluing structure] is underway. Parts for a nine-bar fixture are being made though only a five-bar version will be constructed initially. Ian Winger will start assembly next week.
-Mark and Paul will get together after the meeting by phone to discuss the Change Request for supporting EVMS accounting now that the contract is in place.
+===TOF Module Wrapper===
+Paul will put together a wiki page on this item, a long rectangular channel to help wrap the scintillator. An example was shown as part of his talk at the last collaboration meeting.
+==Contract Status==
+===Assessment of PMT batch 1===
+Sasha has been looking at the 38 PMTs received from Hamamatsu on October 5. A MySQL database has been set up to store parameters and test results for each tube. See [http://hadron.physics.fsu.edu/wiki/index.php/GlueX_Time-of-Flight his wiki] page for details.
+H showed results from gain measurements done on each tube done by measuring the position of the single-photo-electron peak. The results track the data sheet from Hamamatsu to about 5% for a given tube.
+The results for quantum efficiency show the first two tubes with vastly different values (a factor of four difference). The measurement is done with a Americium source and after correction for gain, give a relative value for the cathode sensitivity between the two tubes. Sasha is checking his set-up.
+FSU will send four tubes, including the two already tested, to JLab and the quantum efficiency measurement will be repeated.
+===Procurements===
+The two long-lead-time items are the scintillator and the light guide material.
+# '''scintillator''' The PO went out on October 3rd. since then Paul called Eljen and he expects the first-article counters to arrive on November 21.
+# '''light-guide material''' The order got stuck in FSU Purchasing, but was finally issued earlier this week. Ninety-two feet of acrylic bar (in four-foot sections) is expected to arrive November 5. The machine shop is set up to machine the long light-guides for the half-width counters. The first patch of acrylic will feed that process. Then they will set up for the standard light-guides.
+Paul is still pursuing getting ESR material in rolls rather than in small sheets. He is putting together a specification document to explain the intended use and importance of the larger sheets.
+===Change request===
+Mark posted, on the DocDB, [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2109 documents related to the TOF change request] we submitted at the end of September. The schedule changes were made to facilitate tracking under the Project's earned-value management system (EVMS).

Difference between revisions of "GlueX TOF Meeting, October 25, 2012"

Latest revision as of 17:02, 24 February 2017

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