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Integrated Mechanical Design of 280m Off-Axis -and- CHEC for 280m On-Axis

Integrated Mechanical Design of 280m Off-Axis -and- CHEC for 280m On-Axis. Arie Bodek, Jesse Chvojka Kevin McFarland, Ray Teng University of Rochester T2K 280m WWV, March 2004. “Integrated Mechanical Design”.

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Integrated Mechanical Design of 280m Off-Axis -and- CHEC for 280m On-Axis

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  1. Integrated Mechanical Design of 280m Off-Axis -and-CHEC for 280m On-Axis Arie Bodek, Jesse ChvojkaKevin McFarland, Ray TengUniversity of Rochester T2K 280m WWV, March 2004

  2. “Integrated Mechanical Design” • Traditional design of a fixed target “active detector” is to surround it with separated calorimeters • Problems: • calorimeters are three dimensional “boxes” and may be hard to move • have to move whole calorimeter to access inner detector • complicated mechanical supports

  3. The MINERnA Solution • Outer calorimeters (e.g., “photon catcher”, muon range/toroid, HCAL) are constructed with inner detector in planes… Inner, fully-active strips “Ring” EMCalorimeter Outer Detectormagnetized sampling calorimeter

  4. The MINERnA Solution (cont’d) • The advantages of assembling a detector in planes are clear. Outer detector supports inner in a unified plane. • Complications: • planes are convenient to move, but floppy! • have to route fibers from inner strips “through” outer detector • To study details of this novel design, we are prototyping construction at Rochester

  5. Prototyping Activities (Ray Teng) • Primarily working on fiber routing problem • built a 1/6 hexagon prototype to study Outer HCAL Plastic fiber routing sheet (50mil polypropylene) Pb Absorber (ECAL) Mock-up (one piece) of inner strips 2 meters

  6. Prototyping Activities (cont’d) • Primarily workingon fiber routingproblem • getting outer andinner detectorfibers around theabsorber/frame Outer Det. Bars Plastic fiber routing sheet (50mil polypropylene) HCAL Abs. fibers must bend up (out of plane) and to outside of detector Inner Det. Bar

  7. CHErenkov Counters forOn-Axis • Why CHEC? • we know that we want to monitor beam profile on-axis, but we also know that it is helpful to pick out higher energy neutrinos • more sharply peaked! • may carry information about Kaon contribution of beam, although Hiraide’s studies suggest this is better done off-axis • but it is expensive in $¥£€ to build a building for a neutrino spectrometer on axis (deep)

  8. CHEC Conceptually… • A threshold Cerenkov detector is excellent for finding m above a certain energy • high momentum muons are also well correlated with incoming neutrino energies • can be relatively compact… so they fit in a “well” instead of a detector hall • But… • aren’t there lots of other things rattling around from neutrino interactions?

  9. CHEC Conceptually (cont’d) • Detector has two parts… • scintillator counter at both ends to ensure MIP and only MIP and small angle • then the Cerenkov proper Threshold Cerenkov

  10. CHEC can select muons… All Tracks Low Angle Tracks m other particles so select on the MIP peak at front and back of CHEC

  11. CHEC correlation with Neutrino Energy real muons gm • Note strongcorrelation with neutrino energy • Low background • TO DO • demonstrate Cerenkov efficiency • demonstrate unfolding to neutrino energy from gm En background gm En

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