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Interfaces with the SNS Project for the ARCS Instrument

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... enabled both ARCS and SEQUOIA to move forward with the intimate layout proposed ... Use chopper positions with temporary shielding as necessary to open the beam ... – PowerPoint PPT presentation

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Title: Interfaces with the SNS Project for the ARCS Instrument


1
Interfaces with the SNS Project for the ARCS
Instrument
ARCS Construction Project Review DOE
Germantown Aug. 9, 2004
  • Doug Abernathy
  • ARCS Hardware Project Manager

SNS Instrument Systems
Oak Ridge
2
ARCS internal interfaces
  • The ARCS project is spread across three
    institutions communication is key to keeping
    things on track
  • The instrument scientist (D. Abernathy) has
    visitor status at Caltech as well as being on the
    SNS staff
  • Access to financial information to ease gathering
    of costs
  • Weekly meetings using SNS videoconference
    equipment
  • B. Fultz also has participated
  • SEQUOIA team also attends to discuss common work
    and coordination of design of the adjacent
    beamlines
  • ARCS has an assigned person in Caltech purchasing
    to watch over procurements
  • Some improvement needed in communicating status
    of contracts more attention to including
    documents in SNS system since information is not
    kept just down the hall
  • Communication to IDT via web site, meetings
  • Recently more directed at software efforts

3
Institutional interfaces between ARCS and SNS
  • A Memorandum-of-Agreement and Project Execution
    Plan were signed early in the project
  • Not often referred to, but shows a level of
    commitment
  • Collection of spending information has been
    consolidated at SNS
  • Recent rebaselining will put ARCS under standard
    project controls activities at the SNS
  • Facilitate reporting to Caltech, DOE
  • Ultimately decisions for the project are make in
    the procurement process
  • B. Fultz has to approve based on Caltech
    procurement policies
  • Large purchases are evaluated by a committee that
    includes SNS personnel
  • Everyone understands that the best instrument
    will be one that is robust and can be maintained
    by the SNS after turnover of ARCS at the end of
    the project

4
Prototyping effort benefits
  • Detector in vacuum tests were a joint ARCS/SNS
    venture to prove the concept
  • Requirement by the Backscattering Spectrometer
    for running He-3 LPSDs in vacuum
  • Identification and testing of ZHIP mix should
    benefit several instrument that need low albedo
    instrument shielding with good vacuum
    characteristics
  • Neutronic calculations enabled both ARCS and
    SEQUOIA to move forward with the intimate layout
    proposed
  • ARCS gained from the SNS experience with a
    prototype Fermi chopper
  • ARCS will use shared developments from other SNS
    groups

5
Personnel Protection System
  • ARCS is the first instrument scheduled to operate
    with no curved guide and/or secondary shutter
  • Intent is to serve as a model for this type of
    instrument
  • P. Wright has already met and discussed planned
    modes of operation for ARCS
  • Clarification is needed on some points
  • Can a trapped key system be used to provide for
    personnel safety beyond radiation expose, e.g.
    vacuum vessel access?
  • Does the shielding around the sample area need to
    be designed for the worst case imaginable, or
    will an area radiation monitor be sufficient to
    catch an unexpected case and shut the beam?

6
Neutrino detector nSNS
  • A proposal to place a neutrino detector in the
    corner next to ARCS has been made
  • Strong statement from SNS that no interference
    with instruments is allowed
  • Meetings among nSNS, SEQUOIA and ARCS have
    started to address
  • Keep-clear area for accessing ARCS
  • Floor loading issues, which determine the size of
    the neutrino detector
  • Access for all parties to crane items into the
    pit area

7
Installation
  • Met with SNS installation team (R. Connatser, T.
    Fornek) in July to kick off inclusion of ARCS in
    the overall planning for installation.
  • Installation plan will be reviewed in November
    SNS review
  • ARCS should have a reasonable access to shared
    resources such as the crane by being first on the
    North side of the target building
  • First cut at assigning resources to ARCS tasks
    has been made
  • ARCS will have to provide descriptions of
    installation activities (work packages) for
    inclusion in a global work plan and evaluation by
    SNS estimators
  • Additional information
  • 1M is still an overall estimate for
    installation costs of an instrument. No specific
    analysis of ARCS schedule was made.

8
CD-4 for the SNS
  • The current plan is to do the neutronic
    measurements necessary to satisfy CD-4 for the
    overall SNS project on ARCS
  • An instrument on the water moderator is
    preferable to avoid issues with cryrogenic
    problems.
  • E. Iverson has drafted a plan to use a small
    detector setup at the ARCS sample position to
    determine the performance of the target and
    moderator system as required for CD-4.
  • E. Iverson will evaluate a backup plan in case of
    a delay in installing some part of ARCS by the
    time of the CD-4 measurement
  • Use chopper positions with temporary shielding as
    necessary to open the beam
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