Difference between revisions of "May 2008 Subsystem Review"

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(Remote Connection to the Dru Runs)
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* Thursday 1st of May Room F326/327:
* Thursday 1st of May Room F326/327:
** 1:00 pm Tim
** 1:00 pm Tim [http://www.jlab.org/~whitey/Tim.pptx Talk]
** 4:00 pm Elliott
** 4:00 pm Elliott

Revision as of 11:41, 1 May 2008


The May 2008 Hall D Subsystem Review will cover all aspects of Hall D that have not been reviewed previously under the auspices of the 12 GeV project office. This includes electronics, trigger, DAQ, event and hardware monitoring, experiment and hardware controls, and detector integration, assembly, and maintainability. Milestones for the electronics/trigger/DAQ/monitoring/controls part of the review can be found in Online Major Milestones.

Current planning is for a 1 1/2 day meeting the week of 7-May, with no parallel sessions. This will be a combined Hall D and Hall B review.

Charge for the Review Committee

Draft charge for the committee (see here for the latest):

The scope of this review includes the Hall D electronics and data acquisition systems, the mechanical assembly and installation of the various Hall D detector elements, and the general infrastructure for this new experimental Hall.

For the Hall D System and Infrastructure Design and Safety Review, you are asked to address the following questions:

  1. Are the technical performance requirements adequately defined for the systems under review? Are the plans for achieving technical performance and subsequent construction and testing sufficiently developed and documented for the present phase of the project?
  2. Are the plans to address recommendations of the recent Hall D detector system reviews sound and appropriately developed for this stage of the project?
  3. Are the current designs and plans likely to achieve the performance requirements with a low risk of cost increases, schedule delays, and technical problems?
  4. Are the element fabrication and assembly plans consistent with the overall project and Hall D schedule? Are the plans for the detector integration in the GlueX spectrometer and the associated Hall D infrastructure appropriately developed for the present phase of the project?
  5. Have ES&H considerations been adequately incorporated into the designs at their present stage?

Please address the above questions point-by-point. Note that several aspects of the Hall D detector, electronics, and data acquisition systems have been reviewed previously. Recent 2008 reviews include a February Hall D Forward Drift Chamber mini-review, a February Hall D calorimetry review, and a March Hall D Drift Chambers and associated Particle Identification systems review. You will be supplied with the reports from these earlier reviews along with additional pre-briefing materials.


The current agenda can be found here.


  • Final presentations to Elke: 5-May close-of-business
  • Pre-brief material to reviewers: 30-April
  • Pre-brief material to Hall-D group to read: 23-April
  • Prebrief outlines: 11-April

Remote Connection to the Dry Runs

  • When in F326/327, ESNET will be available.
    • ESNET: 8542553
  • Otherwise, phone connections will be provided.
    • Dial +1-800-377-8846 : US
    • Dial +1-888-276-7715 : Canada
    • Dial +1-302-709-8424 : International
    • Enter participant code: 39527048# (remember the "#")

Dry Runs

All Dry runs are in F326/327

  • Wednesday 23rd of April:
    • 8:00am Graham Talk
    • 1:00pm Tim Talk
    • 4:30pm Dave D and Alex S.
  • Thursday 24th of April:
    • 10:00am Fernando Talk
    • 1:00pm Cindy
    • 4:00pm Elliott Talk
  • Tuesday, 29th of April
    • 4:00pm Rebecca
  • Wednesday 30th of April Room A110:
    • 1:00 pm Fernando
    • 4:00 pm Dave D.
  • Thursday 1st of May Room F326/327:
    • 1:00 pm Tim Talk
    • 4:00 pm Elliott
  • Friday 2nd of May Room F326/327:
    • 8:30 am Elke
    • 1:00 pm Graham
    • 2:30 pm Alex S.

Pre-Brief Materials




Topics Under Review

Below I list topics the review committee might consider. Clearly the committee cannot investigate all of these in depth, but we can expect they will want an overview of most of them, and may probe a few in depth.


  • preamps
  • discriminators
  • F1TDC, FADC250, FADC125
  • timing distribution system
  • TI, TS, TF, TD
  • cable choices
  • HV systems
  • LV systems
  • C-W and other bases
  • SiPM's and other PMT's
  • crate and backplane choices (VXS, ATCA)
  • development and test strategies
  • etc.


  • L1 algorithm
  • rates and backgrounds
  • crate sum + global sum strategy
  • overall trigger strategy
  • crate and hardware choices
  • trigger distribution system


  • event size
  • data rate
  • computer hardware choices
  • network hardware choices and configuration
  • cpu and network utilization
  • software architecture
  • software components (ROC, EMU, ER, etc)
  • language choices
  • run control
  • farm architecture
  • event tranfer to silo
  • metadata recording

Event and Hardware Monitoring

  • event display
  • event monitoring system
  • alarm system
  • archive/display system

Experiment and Detector Controls

  • overall controls architecture (ECS/SCADA/DCS hierarchy)
  • DCS strategy (PLC usage, control loops, etc)
  • SCADA strategy (tentatively EPICS + perhaps MonAlisa)
  • ECS strategy (AFECS)
  • alarm system
  • archive/restore system
  • magnet and cryo control systems
  • interoperability with accelerator controls system
  • redundancy, failure modes, safety issues

Detector Integration

  • tolerances, keep-away zones
  • cable strategy and layout
  • crate layout
  • power, heat, cooling
  • grounding/shielding/EMC
  • mechanical drawing database
  • sign-off procedures

Detector Construction

  • strategy
  • assembly procedures
  • special tooling and equipment needed
  • personnel and equipment safety, other EH&S, etc.

Detector Maintenance

  • ease and expected frequency of access
  • access/disassembly/reassembly procedures
  • routine maintenance
  • expected component lifetimes
  • personnel and equipment safety, other EH&S, etc.