Π polarizability Meeting Feb 3, 2021

From GlueXWiki
Revision as of 16:37, 3 February 2021 by Elton (Talk | contribs) (→‎Minutes)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Meeting Time And Location

09:00 EST (JLab time) Weekly Meeting
10:00 EST (JLab time) Electronics Discussion

REMOTE during Covid-19

Connecting

You can connect using BlueJeans Video conferencing (ID: 949 429 419). (Click "Expand" to the right for details -->):

  1. Make sure you have created a BlueJeans account via your JLab CUE account using this link:

  2. Meeting ID: 949 429 419
    • (you may need to type this in, depending how you connect)

  3. If connecting via Web Browser: click this link (no passcode is needed):

  4. If connecting via iOS or Android App:
    • Use your JLab e-mail address to log in and then enter the meeting ID given above to join the meeting

  5. If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"

  6. If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above



Action Items

Agenda (Weekly CPP Meeting) 09:00 am

  1. CPP Beamline meeting: Jan 28, 2021
  2. Previous CPP meeting: Jan 27, 2021
  3. Announcements
  4. Action Items
  5. CPP and NPP Readiness Review
  6. Data Analysis
  7. PID + AI
  8. Other business
  9. Next meeting

Minutes

Attending: Mark, Rory, Elton, Ilya, Andrew, David, Simon

  1. CPP Beamline meeting: Jan 28, 2021
  2. Previous CPP meeting: Jan 27, 2021
  3. Announcements
  4. Action Items
  5. CPP and NPP Readiness Review
    • Rory went over the outline of his talk, which is based on the Jeopardy Review.
    • Elton went over the draft slides and there was feedback.
    • We will review the slides again tomorrow afternoon with Tim.
  6. Data Analysis
    • Andrew: Presented latest analysis, which shows that the azimuthal asymmetry distribution is not symmetric.
    • Elton: This may have been seen previously and could be due to the the beam position being offset. Andrew will check with Alex A.
  7. Next meeting
    • Next Wed, Feb 10 is the ERR and the following is the collaboration meeting.

Agenda (Electronics Discussion) 10:00 am

  • Discussion on Electronics for CPP
  1. Announcements
  2. CPP and NPP Readiness Review
  3. Elton Draft Slides
  4. Components
    • FADCs, moving the CDC crate electronics
    • Signal cables
    • HV connections to CAEN supply
    • HV cables
    • LV supplies, MPODs?
    • LV cables/connections
  5. Discussion (All)

Minutes

Attending: Rory, Elton, Ilya, Andrew, Simon, Hovanes, Fernando, Nick, Chris (did I miss anyone?)

  1. Announcements
  2. CPP and NPP Readiness Review
  3. Elton Draft Slides
    • We went over a couple of slides on electronics (slides 4 and 5) in Elton's draft presentation to the ERR
    • There was substantive discussion and feedback on several points. From my notes, please send corrections/comments:
  4. FADC cables
    • Original CDC,FDC cables from Amphenol are obsolete. Cable used for prototype in beam is also no longer available
    • Chris has ordered a short section of a new cable that should work. He will check that the assembly with connector all fits.
    • We need a length before the cable is ordered. Now that we have located the location of the rack, we will ask Stephanie to estimate the cable length.
  5. LV supplies/cable
    • Recall: Each chamber requires two +5 and two -5 supplies: Rory: Each supply draws 1 A, i.e. 2x2=4 A per chamber -> 20 W/chamber
    • Fernando: Each MPOD channel delivers 5 A -> can channel supplies one chamber -> need six channels. [Question: In my notes I have that we need six +5V and six -5V = 12 channels?]
    • We will need cables that connect the MPOD supply to the chamber, which has banana plug connections.
    • Hovanes: For the slow control need to know whether one needs control of +/- voltages separately. It was decided that the +/-5 volts can be tied together.
  6. HV supply/cable
    • There is a CAEN HV crate on the upstream south rack and has sufficient space. There is a Drift Chamber card, but it takes the Radial connector (not SHV)
    • There are two options: a) find a card with SHV connectors (I don't think Hall D has any), b) fabricate a Radial-Radial connector and a box with Radial input and SHV outputs (Hall B has made some of these)
  7. Slow Controls:
    • Hovanes: The slow controls can be implemented once the specifications are fixed
    • Tripping on current is part of the HV supply and normal for chambers
    • Ramp rate
    • Define interlocks: temperature? CDC and FCD have temperature interlocks
    • Rory: the electronics is enclosed in a shield, generating 20 W.
    • Nick will purchase thermistors (or thermocouple), one for each chamber. They can be added to the PLC on the platform
    • Gas system: Final design has not been completed, but a relatively simple setup is envisioned. Rory: Proposes six flow meters (one per chamber) set at 5 cc/s. Each chamber will have its own bubbler with a camera to check flow. Beni: He has bubblers in his office.
    • The specification needs to fe finalized before controls are addressed.
  8. Heating of electronics
    • This was discussed in some length
    • Fernando: Suggests adding an inlet and outlet to the electronics box, which could be used to flow gas through the electronics in case it is needed.
  9. Next meeting
    • We will reconvene to try to nail down the loose ends.
Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=Π_polarizability_Meeting_Feb_3,_2021&oldid=103794"