Difference between revisions of "May 21, 2009 Readout"
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** +1-888-276-7715 : Canada | ** +1-888-276-7715 : Canada | ||
** +1-302-709-8424 : International | ** +1-302-709-8424 : International | ||
| − | ** then enter participant code: | + | ** then enter participant code: 39527048# (remember the "#") |
=Items for followup from previous meeting= | =Items for followup from previous meeting= | ||
# Bcal section | # Bcal section | ||
#* Zisis will get a quote from Ross machining to find out how much it would cost to polish a segment (both ends) | #* Zisis will get a quote from Ross machining to find out how much it would cost to polish a segment (both ends) | ||
| − | # | + | # <strike> JLab to determine how many fibers could be spared now to use in this project </strike>. |
| − | + | # <strike> Elton: Feedback to Will on estimate of photons in Bcal </strike>. See halld-cal [http://www.jlab.org/ccc/mail_archives/HALLD/halld-cal/msg01012.html e-mail] | |
| − | # Elton to | + | # Will, update references on "alternative readout page" with those found by Zisis |
| − | + | # Zisis, Elton: Suggestion to USM on testing prototype | |
| − | + | # USM: sketch of test setup to facilitate feedback | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | ## | + | |
| − | # | + | |
| − | + | ||
= Documents to Review= | = Documents to Review= | ||
| − | [ | + | # [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1279 GlueX-doc-1279] Comments for bullets on agenda 5 and 6 |
| − | + | = Tentative Agenda = | |
| − | [http://www.jlab.org/Hall-D/software/wiki/images/ | + | # Announcements |
| − | + | # Review of Action Items | |
| − | + | # [http://www.jlab.org/Hall-D/software/wiki/images/c/c4/Report21May2009.pdf USM report (Will)] | |
| + | # Keepout zones for light guides and magnetic shielding | ||
| + | # Discussion of readout options | ||
| + | #* Time for internal review (end of June / beginning of July)? | ||
| + | #* Number of photons per GeV (Sasha and Elton) | ||
| + | #* Budget comparison (Elton) | ||
| + | # Location of FM pmts relative to B-field | ||
| + | # Prototyping | ||
| + | # Simulations | ||
| + | # Discussions on MOU with USM | ||
| − | = | + | = Minutes = |
| + | Attending: Elton, Sasha, Tim, Eugene, Beni, George, Will, Irina, Andrei <br> | ||
# Announcements | # Announcements | ||
# Review of Action Items | # Review of Action Items | ||
| − | #* | + | #* Reviewed and updated. |
| − | #* | + | #* Shipment of Bcal wedge from Edmonton expected next week. After careful measurements of fiber pitch can make this available to Chile for prototype tests |
| − | + | #* Beni has made an inventory of fibers at JLab. Will to decide how many are needed for prototyping and see if fibers purchased previous to first-articles can be used. | |
| − | #* | + | #* Unclear precisely what items 3 and 4 were. Will will make a detailed plan for prototyping for feedback. George emphasized that using cosmics provides a useful testbed for understanding the energy deposition and can be used to cross check calculations. |
| − | + | # [http://www.jlab.org/Hall-D/software/wiki/images/c/c4/Report21May2009.pdf USM report (Will)] | |
| − | #* | + | #* Estimates of components to the resolution were presented and discussed. |
| − | + | #* Threshold was discussed. Eugene pointed out that noise is important when considering the threshold. | |
| − | + | #* The floor term was discussed. Arises due to leakage, and calibration issues. There are differences that are expected between the prototype and the final detector. Eugene suggested that 2% is to be expected for a large number of channels. Non-uniformities and how well these can be calibrated plays a role in that term. | |
| − | # | + | #* Andrei: The 'a' term changes by about 20% between 90deg and 20deg according to simulations. |
| − | #* | + | # Discussion of readout options |
| − | #* | + | #* Time for internal review (end of June / beginning of July)? Tentative date set for July 14. |
| − | + | #* Number of photons per GeV (Sasha and Elton) | |
| − | #* | + | #** Elton presented a summary of numbers already documented. |
| − | #* | + | #* Budget comparison (Elton) |
| − | #* | + | #** Table of budgets (from last fall) was shown. Eugene: The FM option is nominally 350k more expensive, but assumed $0.4k/SiPM. The balance may change if the SiPMs are more expensive than this initial estimate. Therefore, this option should still be considered seriously. |
| − | #** | + | #** A detailed accounting of both options needs to be redone. |
| − | #* | + | #** Will pointed out that the cooling of SiPMs is not yet included. |
| − | #** | + | #** Beni noted that the dynamic range might require a change in the channel count for electronics. |
| − | #* | + | # Location of FM pmts relative to B-field |
| − | # | + | # Keepout zones for light guides and magnetic shielding |
| − | #* | + | #* Elton presented plots of Btot and angles relative to z-axis. It appears that there will be room to place FM pmts (oriented radially) with Btot<0.2T and oriented along the field direction. |
| − | + | # Simulations (for next time) | |
| − | #* | + | #* Sasha will send a link to studies of energy deposition in the Bcal and present his work next time. |
| − | + | #* Andrei will complete simulations of number of visible photons per GeV. | |
| − | # MOU with USM | + | # Discussions on MOU with USM |
Latest revision as of 17:13, 24 February 2017
Teleconference Time: 11:00 a.m. EST
- EVO session
- Phone:
- +1-800-377-8846 : US
- +1-888-276-7715 : Canada
- +1-302-709-8424 : International
- then enter participant code: 39527048# (remember the "#")
Contents
Items for followup from previous meeting
- Bcal section
- Zisis will get a quote from Ross machining to find out how much it would cost to polish a segment (both ends)
-
JLab to determine how many fibers could be spared now to use in this project. -
Elton: Feedback to Will on estimate of photons in Bcal. See halld-cal e-mail - Will, update references on "alternative readout page" with those found by Zisis
- Zisis, Elton: Suggestion to USM on testing prototype
- USM: sketch of test setup to facilitate feedback
Documents to Review
- GlueX-doc-1279 Comments for bullets on agenda 5 and 6
Tentative Agenda
- Announcements
- Review of Action Items
- USM report (Will)
- Keepout zones for light guides and magnetic shielding
- Discussion of readout options
- Time for internal review (end of June / beginning of July)?
- Number of photons per GeV (Sasha and Elton)
- Budget comparison (Elton)
- Location of FM pmts relative to B-field
- Prototyping
- Simulations
- Discussions on MOU with USM
Minutes
Attending: Elton, Sasha, Tim, Eugene, Beni, George, Will, Irina, Andrei
- Announcements
- Review of Action Items
- Reviewed and updated.
- Shipment of Bcal wedge from Edmonton expected next week. After careful measurements of fiber pitch can make this available to Chile for prototype tests
- Beni has made an inventory of fibers at JLab. Will to decide how many are needed for prototyping and see if fibers purchased previous to first-articles can be used.
- Unclear precisely what items 3 and 4 were. Will will make a detailed plan for prototyping for feedback. George emphasized that using cosmics provides a useful testbed for understanding the energy deposition and can be used to cross check calculations.
- USM report (Will)
- Estimates of components to the resolution were presented and discussed.
- Threshold was discussed. Eugene pointed out that noise is important when considering the threshold.
- The floor term was discussed. Arises due to leakage, and calibration issues. There are differences that are expected between the prototype and the final detector. Eugene suggested that 2% is to be expected for a large number of channels. Non-uniformities and how well these can be calibrated plays a role in that term.
- Andrei: The 'a' term changes by about 20% between 90deg and 20deg according to simulations.
- Discussion of readout options
- Time for internal review (end of June / beginning of July)? Tentative date set for July 14.
- Number of photons per GeV (Sasha and Elton)
- Elton presented a summary of numbers already documented.
- Budget comparison (Elton)
- Table of budgets (from last fall) was shown. Eugene: The FM option is nominally 350k more expensive, but assumed $0.4k/SiPM. The balance may change if the SiPMs are more expensive than this initial estimate. Therefore, this option should still be considered seriously.
- A detailed accounting of both options needs to be redone.
- Will pointed out that the cooling of SiPMs is not yet included.
- Beni noted that the dynamic range might require a change in the channel count for electronics.
- Location of FM pmts relative to B-field
- Keepout zones for light guides and magnetic shielding
- Elton presented plots of Btot and angles relative to z-axis. It appears that there will be room to place FM pmts (oriented radially) with Btot<0.2T and oriented along the field direction.
- Simulations (for next time)
- Sasha will send a link to studies of energy deposition in the Bcal and present his work next time.
- Andrei will complete simulations of number of visible photons per GeV.
- Discussions on MOU with USM
