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Near Detector Plane Assembly


Assembly History  | Photos | Which Modules on Which Planes | Detector Section Layout


Plane Assembly is the process of attaching scintillator modules to steel plates. This Page holds information on the overall Detector Layout into Veto, Target, etc sections, a history of the plane assembly process, which modules ended up on which planes, and link to the Module Maps pages.


Which Modules on Which Planes

  • A 1-page illustration of the 4 Plane Types with their Module Types
  • The Plane Layouts page has links to more detailed diagrams showing H-clip and module snout locations
  • Assembled Planes Spreadsheet - this PDF of an Excel sheet holds 4 column groups which each represent a storage stand at New Muon; each plane number is shown in it's location on a stand, with the Module ID numbers showing which modules were attached to each plane. The module IDs are color-coded, with red being the modules which contain a bad strip. One can scan this spreadsheet for an overview of the distribution of bad strips in the Detector.
  • For more information on how strips were determined to be bad, see the Module Quality Ratings page.
  • The Module Ratings Sheet is a multi-sheet Excel file listing each module by module type and module number, with the final Rating as determined by the Review Board. The bad strip number(s) on bad modules is itemized, along with comments on the module's rating, and which Plane the module was attached to.
  • The Module Maps index page holds links to the Mapping Table Summary Data for each and every Module, listed by Module Type and Module Number

Detector Section Layout

The detector layout is shown schematically below, in the upper colored bar, with the four main sections as labeled. These are software-setable logical boundaries, with the default design boundaries shown. The bar below it shows the dector sectioned by approximate module quality; this scheme developed from various working group meetings, held at collaboration meetings, during the design phase of the experiment......although one will be hard-pressed to find anything in writing showing a decision path. Nonetheless, the lower color bar shows the agreed-upon plan for the distribution of module qualtiy types within the detector.

For physics purposes, keep in mind that the average 1-2 GeV neutrino which interacts in the Target Region planes, will have it's shower contained within the Target and upstream Hadron Region planes, and it's muon will have stopped before reaching plane 156, at the end of the purple section above. Higher energy neutrinos interacting in the Target planes will produce muons which reach further downstream into the Muon Spectrometer. This doesn't make the bulk of the Muon Spectrometer useless in the low energy beam - to map out the oscillation curve we need to measure a spectrum of neutrino energies, and the low energy beam has a medium and high energy tail which provides this spectrum. Neutrino interactions occur all over the detector, of course; we choose to segregate those occuring in the Target planes for Near-Far rate and spectrum comparisons. The 4:1 multiplexing of phototube channels begins at plane 121, at the boundary of the blue and brown sections in the upper color bar.

Plane Assembly History

Near Detector Plane Assembly started Tuesday April 2nd, 2002. By the end of April, about 30% of the instrumented planes were completed. Assembly was halted during May and part of June due to questions concerning the techniques used to analyze the scintillator module map data and in turn the module quality rating system. The Near Module Review Board was convened to discuss the map data and rating criteria; the Board's job was essentially completed by the end of August. In late June there was sufficient understanding of the older map data analysis to resume plane assembly. By the end of July, 70% of the planes were completed, and the assembly had caught up to the production and delivery of scintillator modules. The remaining planes were assembled in November and December 2002, after all modules required to complete the detector were delivered.

Photos

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Page last updated Monday, February 16, 2004

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