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Where to put Towers A and B in the Grid – technical issues

This document discusses the technical considerations and reasoning behind the placement of Towers A and B in the Grid. It also includes information on cable lengths, installation sequence, and cross-checks with various experts.

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Where to put Towers A and B in the Grid – technical issues

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  1. Where to put Towers A and B in the Grid – technical issues 18-Jan-2005 L. Wai (SLAC/Group K) for LAT I&T

  2. Baseline plan for first two towers radiator +Y • Defined in LAT-MD-676 • TEM/TPS – GASU/PDU cable lengths optimized for baseline sequence • First two towers in baseline sequence are bays 8 & 9 • Connector savers on first TEM/TPS come off to allow insertion of second CAL module • Flight TEM/TPS – GASU/PDU cables and associated cable tray hardware are installed for 2-tower testing +X SIU PDU GASU +Z coming out of page radiator MGSE rotation axis

  3. Baseline plan reasoning • Start on PDU side and work towards SIU side for ease of cable installation • Start in center and work towards edges for ease of tower installation • Install “opposing” pairs including associated cable trays and flight cables to minimize risk in electrical testing

  4. New considerations since baseline planning

  5. Particle physics detector “intuition” • Put the best detectors on the inside; for LAT, this means bays 5, 6, 9, 10, • Put detectors on the outside good enough for background rejection; for LAT, put towers with most bad channels in corners • Don’t use data from outside an analysis defined “fiducial volume” in final analysis

  6. Best option, given current information and status of flight hardware and EGSE: Grid bays 0,4

  7. Proposed installation sequence • TKR-A / FM104 into bay 0 • TKR-B / FM105 into bay 4 • Keep connector savers on and use EGSE TEM/TPS-GASU/PDU cables for 2-tower test • Return to start of baseline installation sequence with subsequent towers

  8. Cross-checks • Martin Nordby (integration issues) • “no show stoppers” • Gary Godfrey (Van De Graaff issues) • “no show stoppers” • Eric Gawehn (MGSE issues) • “no show stoppers” • Bill Atwood (physics issues) • “no show stoppers”

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