Hall D Home Page

Attendees

The posted agenda was followed fairly closely. Paper copies of transparencies will be mailed to the Hall D institutions. Some of the talks are available electronically.

Alex Dzierba - Introduction and Overview (see PDF version)

Elton Smith - Civil Construction - Elton reviewed the plans for the beam line and the design parameters. The operating values [design max] for electron current is 3 [5] micoramps, electron power 36 [60] KW, photon power at the collimator 7 [10] W and photon power at the detector 1 [1.5] W. He also talked about implications for 24- GeV compatibility. In the 24 GeV configuration Hall D can have 0.5, 1.5 or 2.5 passes less than E[max]. he reviewed the buildings and the foot prints on the DOE/SURA land. Note the addition of an accelerator service building. He presented the results of the goetechnical analysis and his artist's view of the soil composition. Shielding was discussed. Conservative estimates are 3 m of earth at the tagger building, permanent magnet dipoles to prevent electrons from reaching the detector building, 1 m Fe and 5-6 m of earth on the top and sides of the electron dump, 1.2 m Fe on top of the collimator, 10 cm of concrete on the top and sides of Hall D and 10-12 m Fe of muon shielding for the electron and photon beams. The cost for the beamline is $3.5 M and 10th arc is $2.8 M (not assessed to Hall D) and $6.7 M for buildings and roads (with pilings) while the below grade option would cost $7.4 M. Elton proposes an internal review of plans in mid-June.

Paul Brindza - Magnet Assessment - Paul's note on plans for the solenoid upgrade is available in PDF format. For reference, the original committee report on the LANL trip is also available.

Richard Jones - Photon Beam - Richard reviewed what should be done with regard to understanding crystals with respect to thinning and heat load (sublimation and mechanical stresses). He will do some calculations and suggests that we get in contact with the Glasgow (Jim Kellie and K. Livingston) to join Hall D. Richard also reported on Charlie Sinclair's note that 10 micron thick crystals have been achieved. J. Kellie from Glasgow is trying to arrange for Drukker to polish a 4 mm x 4 mm synthetic diamond crystal down to 10 microns.

George Lolos - Barrel Calorimeter - George summarized R&D plans and Candian funding discussions with NSERC.

Carlos Salgado - Calorimetry R&D - Carlos reviewed R&D possibilities to replace lead with tungsten powder. He discussed pressing techniques. Work is in progress.

Takashi Nakano - SPring8 - Takashi reviewed the LEPS program and Pb/SciFi and PWO calorimetry.

Paul Eugenio - Tracking - Please find a postscript version of Paul's talk here.

Curtis Meyer - TPC - Curtis reviewed TPC options. In his opinion, the radial TPC option will not work but a central TPC will probably work. Simulation studies will start to answer which tracking option to use. See Curtis' earlier note on the TPC.

Werner Boeglin - START Counter - Werner discussed his and Andi Klein's work on the START counter.

Paul Smith - Electronics - Paul reviewed R&D plans for pipeline trigger, FADC and TDC's.

John Cameron - IUCF - John, the IUCF Director, reviewed the nuclear physics and medical physics program at IUCF.

Steve Gottlieb - Lattice Gauge Calculations and Chiral Extrapolations - Steve gave us an introduction to lattice calculations and issues of systematic errors w.r.t. volume, quark mass and lattice spacing. He reviewed glueball and exotic hybrid calculations and prospects for the future. Steve also discussed chiral extrapolations.

Ulrike Thoma - Plans for CB-ELSA - Ulrike reviewed the plans for the Crystal Barrel detector now installed in the ELSA facility at Bonn. The physics program includes the search for baryon and meson resonances in photoproduction.

Jean Marc Laget - Hadronic Physics with Real Photons - Jean Marc discussed other Hall D physics possibilities including exclusive reactions and charm at threshold. Please refer to the April 3 JLab Workshop on threshold charm and a talk [PDF] by Jean Marc at an earlier workshop.

Adam Szczepaniak - Theory Summary - Adam discussed possibilities with Hall D. These look quite good since we could look at muons and DDbar in addition to J/psi --> e+e-. Real Compton scattering is probably not a good option for Hall D.

Randy Macleod - Simulations Summary - please see http://www.jlab.org/~rwm/hall-d/april2000/sim/MC-April-2000.htm

Dave Doughty - Electronics Summary - Dave reviewed the issues and will contact Glenn Young (ORNL and Cassel committee member) who raised questions at the review.

Elton Smith - Systems Integration Summary - It was decided to make the beam height 3.5 m above the Hall D floor - this to allow room for Cerenkov counter pm's. The magnet cannot be shortened and iron will fill the gaps. The longitudinal real estate for the Cerenkov counter is 1.5 m. The START counter and target assembly will be mounted separately. The LGD frame will have to be rebuilt.

Eric Scott has posted two updated detector drawings based on these discussions (drawing 1 and drawing 2 in eps format).

April 14	new GEOM MCFAST (Eugenio)
April 18	Brief MOU for R&D projects for this calendar year
May 1	first PWA test (Eugenio/Szczepaniak/Cummings/Weygand)
May 15	American Scientist deadline (Dzierba/Meyer/Swanson)
June 1	version 2.8 of the Design Report (Dzierba)
June 15	Hall D contribution to JLab white paper for upgrade (Dzierba/Meyer/Smith)
June 21-23	Users Meeting at JLab
June 30	Double-blind PWA test (Eugenio/Szczepaniak/Cummings/Weygand)
July 1	Electromagnetic backgrounds
July 20	Final detector configuration
August 4-5	Collaboration meeting at JLab
August 7	All Design Report contributions due
August 15	Design Report ver 2.9
August 18	Go to press - ready for the Design Report ver 3.0