[Halld-jlab] Hall D Staff Meeting Notes, July 27, 2015

Tue Jul 28 17:44:23 EDT 2015

Folks,

Find the notes below and at

https://halldweb.jlab.org/wiki/index.php/Private:Hall_D_Staff_Meeting,_July_27,_2015

   -- Mark
   ___________________


Private:Hall D Staff Meeting, July 27, 2015

Present: Mary Jo Bailey, Fernando Barbosa, Eugene Chudakov (chair), 
Alexandre Deur, Sergey Furletov, Mark Ito, David Lawrence, Bert Manzlak, 
Paul Mattione, Lubomir Pentchev, Elton Smith, Sascha Somov, Justin 
Stevens, Simon Taylor, Glenn Young, Beni Zihlmann


Eugene

  * PAC results came out
  * solenoid review, two weeks ago
      o final report is out
      o thermostats should be looked at
      o lack of cryostability: cause not clear
          + local heating?
          + ice build up? in He volume? vacuum volume?
      o He supply system will not see small fluctuations
          + 20% variation might not be noticed
      o pressure rise causes rise in resistance
  * we need to make a space request for the DIRC to Walt Akers
      o Justin: leave boxes at SLAC as long as possible
      o when they are moved here, move directly to Hall
      o will try to use one-bar-box read-out prototype set-up at SLAC
      o will needs to devise tests to make sure boxes made trip to JLab
        safely


Mary Jo

  * new proposal for hazard issues list
      o list reviewed annually
      o part of EH&S manual
      o old list revised: some items not strictly issues, per se
      o rewritten from worker's point of view
      o linked to OSP system to ensure appropriate SME review
      o methodology: ask questions for each area
      o comments to Mary Jo (mbailey at jlab.org)
      o proposed roll-out of new list: August 3, 2105


Fernando

  * stuff is working
  * current work: polarimeter
      o new enclosure, power distribution
  * MO boards
      o ran without firmware in Spring, Ed working on it
      o RF clock jitter: several fs, between crates: 150 ps
      o Ed J.: perhaps from loss of resolution at rollover of F1-TDC
      o Ben: jitter tested out of clock distribution system: 3 ps
      o in Hall there are TIs, STs
      o Paul and Elton looking at jitter
      o 4 crates involved: PS, TOF, tagger, FDC


Eugene, Engineering

  * Tim working on acoustic detectors for solenoid
  * work with SRF group
  * Piezo-electric device attached to metal plate, from there with rods
    to coils
  * thermal events make no noise, motion of flux jumps might


Eugene, End-of-Fiscal-Year Purchases

  * please send requests to Eugene within the week
  * we have lots of TI boards
  * we may be short of trigger distribution boards
  * rapid access for Hall D requires CARM boxes, not cheap


Mark and David, Git Conversion

  * Git conversion generally going well
      o No major problems
      o We are climbing the learning curve


David

  * sending a test set-up to UMass for CPP detector tests
      o including an Flash-125
  * working on Geant4, merging CPP with Richard Jones's work on geometry


Elton

  * loan to UMass went quickly perhaps because CPP is an approved experiment
  * BCAL back on after power shutdown
      o HV channel tripped, on for one week now
      o humidity monitors were erratic, replaced sensors, upstream and
        downstream about the same now
  * FCAL calibrations
      o looking at electrons 10% lower energy for clusters, hits are
        included from out-of-time
      o see radial dependence in constants
  * focus shifting to Monte Carlo, looking for limits of hardware
  * improvements to firmware for Flash-250s being discussed
      o Sasha: document exists for scintillators


Simon

  * FCAL clusters including late hits, re-working clusterizer adding
    timing cut
  * CDC straws distorted, timing distributions different on different
    sides of the wire, source of long tails in timing dists
      o Mike Staib looking at cosmics, Simon at beam data
      o bad straw fraction may be as high as 50%


Sergey

  * looking at new FPGA code for F1TDCs
  * asked for final version of F125 code from Cody
      o at least would like final version as far as DAQ is concerned


Paul

  * submitted proposal to JSA for analysis workshop
  * scaler gui's written, need test


Mark

  * Spring 2015 simulations: data generated
  * Data Challenge 3: generating 10 TB of "raw" data


Sascha

  * F1-TDC, Ed, read-out failure at high rate, Sergey reproduced, Ed
    confirmed
      o new version of firmware coming
      o FIFO overflow causes FPGA code failure
  * students are documenting, pair spectrometer hodoscope, time calibration
  * working on proposal for nuclear targets


Alexandre

  * looking at beamline data
      o no time coincidences between beam event and magnet quench found


Justin

  * S&T starts tomorrow, runs for 3 days
      o has given practice talks, favorable reaction from Management
  * polarized rho's, fits being performed, spin density matrix elements
    look do-able
  * DIRC: prepare for review, writing TDR documents


Lubomir

  * FDC at design resolution with straight tracks
      o 80 micron wire position resolution with two planes after
        correction for angle
      o 200 microns resolution from tracking residuals
  * studies with Fe55 source
      o see effect of screening of wire
      o confirmed with Garfield simulation


Beni

  * FDC operational now, but not with normal gas mixture
      o CO2 MFC died
      o CDC running off FDC system with 50-50 mix
      o 100% argon in CDC for a bit
  * target retracted, upstream end of CDC accessible
      o Beni: work on grounding, noise on CDC even after high frequency
        filters on HV lines, likely noise from pre-amp cards
      o sees slope on baseline
      o need to talk to Tom if want to delay target re-insertion
  * working with FSU student Brad Cannon on TOF calibration. Brad
    on-site for two weeks


Bert

  * 70% of all summer students at Lab working in Physics
      o Rolf wants survey on student safety: labs, halls, storage buildings
      o EH&S asking the questions
      o look at hazard awareness, work control documents, required
        training, knowledge of limits of work practices
      o supervisors responsibility nominally
  * HDList being used, please continue to do so
      o see Bert if you need help
      o posting a printed copy in work area a good practice
  * about one week ago: golf cart event
      o accelerator got stuck, hit bumper stops
      o investigation on-going
      o test brakes if using golf carts


Eugene, Solenoid

  * planning test in two weeks
  * test plan not firm
  * an opportunity for test effect of field on detectors, be prepared if
    this is a concern
  * magnet on for 1 or 2 weeks
  * considering re-doing cryostat on coil 4
      o only one not done
      o but coil 1 quenched first

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