Difference between revisions of "GlueX PID Meeting, April 16, 2010"
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=Minutes= | =Minutes= | ||
| − | + | * '''FIU''': Werner Boeglin, Eric Pooser | |
| − | + | * '''FSU''': Sasha Ostrovidov | |
| − | + | * '''JLab''': Eugene Chudakov, Mark Ito (chair), Chris Keith, Sascha Somov, Simon Taylor | |
| − | + | * '''UMass''': Rory Miskimen | |
| + | ==Announcements== | ||
| − | Werner | + | * Werner told us that they have just signed a new MOU with JLab to fund the bridge position. The search is done, an offer can be made now. |
| − | search done, offer can be made | + | |
| − | last | + | ==Minutes from the last meeting== |
| + | We went over minutes from the ???9/9/9999 meeting. | ||
| − | + | * Werner is in the process of filling out the JLab loan agreement so that Carl Zorn can send hime a SiPM array to play with. | |
| + | * Paul Eugenio had mentioned to Mark that the FSU-JLab construction MOU was with his chair and was being discussed. | ||
| + | ==Time-of-Flight Status== | ||
| + | Sasha O. showed some ??? results from initial cosmic tests with an integrating ADC. The goal is to do time-walk corrections for a leading edge discriminator. He is using an CAEN VME 12-bin ADC. With a gate width of 100 ns he is seeing overlap of the signal with the pedestal value, motivating the choice of a 50 ns gate. The tube with lower efficiency has lower gain as might be expected. There is evidence of saturation of the "left" ADC channel; see the non-linearity at high pulse height in the right vs. left ADC count plot. | ||
| − | + | ==Target Status== | |
| − | + | ||
| − | + | Chris reviewed a quote he received for the pulse tube refrigerator he described last time. He received two quotes, for 51 k$ and 57 k$ with the latter having a remote motor option (motor in a separate housing connected with a 24 in. flexible coupling). Both units include the cold head and the compressor for helium gas. The remote motor option decreases cooling power by 10% which should not be a concern. Chris has sent the quotes to Tim Whitlatch and will also send them to Eugene. The unit can be shipped 16 week after the order is received. | |
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rory, mou, some edits from elton and fernando, coming to collaboration meeting, some issues, solid target in mou, but not funded in hall d. construction schedules in mou, viewed as not feasible due to funding profile, major revision | rory, mou, some edits from elton and fernando, coming to collaboration meeting, some issues, solid target in mou, but not funded in hall d. construction schedules in mou, viewed as not feasible due to funding profile, major revision | ||
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adc pedestals | adc pedestals | ||
reverse attenuation length relation with thickness | reverse attenuation length relation with thickness | ||
| + | |||
| + | ==New Action Items== | ||
| + | |||
| + | * Send refrigerator quotes to Eugene. -> Chris | ||
Revision as of 09:43, 19 April 2010
Contents
Location, Time
Friday, April 16, 2010
2:00 pm EDT
JLab: CEBAF Center, Room F326/7
ESNet: 8542553
EVO: direct meeting link
Conference Group: 800-377-8846, participant code: 77438230
Slides: talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2010-04 on the JLab CUE (you have to be a member of the "halld" group). This directory is accessible from the web at https://halldweb1.jlab.org/talks/2010-04/ .
Agenda
- Announcements
- Minutes from the last meeting
- Time-of-Flight Status: Sasha O. [1]
- Start Counter Status: Werner Boeglin/Eric Pooser
- Target Status: Rory Miskimen
- Action Items
Minutes
- FIU: Werner Boeglin, Eric Pooser
- FSU: Sasha Ostrovidov
- JLab: Eugene Chudakov, Mark Ito (chair), Chris Keith, Sascha Somov, Simon Taylor
- UMass: Rory Miskimen
Announcements
- Werner told us that they have just signed a new MOU with JLab to fund the bridge position. The search is done, an offer can be made now.
Minutes from the last meeting
We went over minutes from the ???9/9/9999 meeting.
- Werner is in the process of filling out the JLab loan agreement so that Carl Zorn can send hime a SiPM array to play with.
- Paul Eugenio had mentioned to Mark that the FSU-JLab construction MOU was with his chair and was being discussed.
Time-of-Flight Status
Sasha O. showed some ??? results from initial cosmic tests with an integrating ADC. The goal is to do time-walk corrections for a leading edge discriminator. He is using an CAEN VME 12-bin ADC. With a gate width of 100 ns he is seeing overlap of the signal with the pedestal value, motivating the choice of a 50 ns gate. The tube with lower efficiency has lower gain as might be expected. There is evidence of saturation of the "left" ADC channel; see the non-linearity at high pulse height in the right vs. left ADC count plot.
Target Status
Chris reviewed a quote he received for the pulse tube refrigerator he described last time. He received two quotes, for 51 k$ and 57 k$ with the latter having a remote motor option (motor in a separate housing connected with a 24 in. flexible coupling). Both units include the cold head and the compressor for helium gas. The remote motor option decreases cooling power by 10% which should not be a concern. Chris has sent the quotes to Tim Whitlatch and will also send them to Eugene. The unit can be shipped 16 week after the order is received.
rory, mou, some edits from elton and fernando, coming to collaboration meeting, some issues, solid target in mou, but not funded in hall d. construction schedules in mou, viewed as not feasible due to funding profile, major revision
eric pooser
measured light output as a fuctnion of disktance 235mm thick, 2.25 sr90 electrons, absorbtion coefficients measured 2 462 mm 3 249 mm 5 221 mm using trigger pmt under source end of strip has fine-mesh pmt light guides? face of fine-mesh pmt against scintillator directly werner: why is so much light lost, perhaps lousy surface from manufacturer unpack and test directly brand new Eljen ej200 eric: bending cutting and polishing, plan to work this summer with geant simulations of scintillor
adc pedestals reverse attenuation length relation with thickness
New Action Items
- Send refrigerator quotes to Eugene. -> Chris
