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FINESSE

FINESSE. Delicacy and refinement of performance, execution or workmanship Tact, subtlety, or skill in handling a situation. A strawman design of RPC-based neutrino detector. Low Z tracking calorimeter. Absorber thickness vs physics: muon ID/measurement ~ 10 – 20 g  D p ~ 10-30 MeV

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FINESSE

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  1. FINESSE • Delicacy and refinement of performance, execution or workmanship • Tact, subtlety, or skill in handling a situation

  2. A strawman design of RPC-based neutrino detector Low Z tracking calorimeter • Absorber thickness vs physics: • muon ID/measurement ~ 10 – 20 g  Dp ~ 10-30 MeV • Electron ID  0.25 – 0.5 X0 • Final state studies  ZERO

  3. The fundamental issue: low cost detector • Use standard materials whenever possible: • Float glass • Particle board • Insulation boards • Use industry standard dimensions (like 20’, 4’x8’) to minimize customized production • Modular design to minimize installation/integration effort • Robust technology to minimize environmental requirements (temperature, pressure, humidity)

  4. Absorber • Particle board (or equivalent) • Cheap • Good mechanical properties. Can be used to build a self-supporting detector wall • How long is the radiation length?? Assume 45 grams( like plastic), need to verify/measure. • 1/3 radiation length sampling  15 grams ~ 20 cm ~ 8”

  5. Particle board

  6. Resistive Plate Counters (Virginia Tech, BELLE) Glass electrodes are used to apply an electric field of ~4kV/mm across a gap. (1mm? 2mm?) The gap has a mixture of argon,isobutane and HFC123a gas. An ionizing particle initiates a discharge which capacitively induces a signal on external pickup strips. 5 years of tests in Virginia Tech, 4 years operating experience in Belle

  7. Why glass RPC’s? • Proven technology (BELLE). Glass avoids all the problems associated with bakelite/linenseed oil at the price of poor rate capabilities => well matched to the experimental requirements • Two spatial coordinates from the same detector plane => maximize the topological information • Large signals with digital readout => easy and inexpensive electronics • Easy to form long readout pads by connecting chambers => minimize (cheap!) electronics • Wide range of acceptable temperatures and pressures => minimize requirements for the building (RPC chambers proven to function down to –12oC, although glass resistivity changes by a factor of 40! Peter Mazur)

  8. Inductive strips readout board – Al Abashian Strip readout : transmission line using insulation board. Strips cut with a table saw Twisted pair cable + mass connector Copper pads glued to the board to facilitate cable attachment

  9. Transmission Line Impedance w h Readout Strips er Ground Plane Via G. Drake, from: “Introduction to Electromagnetic Compatibility”, Clayton R. Paul, 1992.

  10. Impedance Measurement Input • Tune termination for each strip width to get 0 reflected signal for injected charge pulse • Summer student Oluwaseun Amoda (EE undergrad from U. Memphis.) • open termination • - best termination I into 50 W (V) Back reflection Front reflection t (sec) Peter Shanahan, Valery Makeev, Olu Oamoda, Raoul Hennings

  11. Impedance vs. Width • General agreement with expected dependence of Z vs. x=w/h • Z=62 W for 3cm strip • For ½” thick board

  12. Chained Readout Boards electronics • Issues: • Attenuation in board • Impedance mismatch (and reflections) at internal boundaries • Don’t expect it to be important for frequencies below ccable/lgap (more simply, won’t hurt if propagation across gap is faster than rise time ?) • If so, allows up to O(0.5m) or so for interconnections. Appropriate termination Optics analogue

  13. Transmission Measurements Charge pulse ADC • Measure charge collected from injected pulse as function of distance from readout end Summer Student, Raul Hennings-Yeomans (Physics undergrad from U. Hermosillo, Mex.) 10cm twisted pair 8 ft (2.44m)

  14. Transmission • Less than 3% loss over 10 meters • This is charge – didn’t keep track of peak voltage • No specific effects due to strip interconnects are visible on scale of 1% uncertainties. ADC charge vs. distance (cm) Different symbols correspond to identical trials

  15. Glass chamber + strips sandwich Large area glass RPC sandwiched between two readout boards: X and Y coordinate from a single chamber

  16. Storing and handling large glass chambers 29 large area GLASS RPC chambers from Virginia Tech Rotating table for handling the chambers

  17. Absorber+RPC module • Need to cover 2.4x6 m with glass chambers: • 3 chambers 2x2.4 m? • 2 chambers 3x2.4 m? • 5 chambers 0.48x6 m?

  18. Mechanical prototype of the absorber+chamber module

  19. Mechanical prototype of the module

  20. FINESSE in numbers Example: 10 t detector • 4 x 3 meter detector (two chambers 2 x 3 meter side-by-side) • 100 kg/plane  need 100 planes • 1200 m sq  $120-200 K • 3 cm thick plane  3m long detector • 3 cm strips 233 channels/plane, 23K channels total  $250 K + VME DAQ etc.. • Can start construction immediately • Can construct the entire detector in ~ 6 month

  21. ‘other’ but related experiments • Nue component of the beam: add 10-15 cm of particle boards between chambers • Numu detector a.k.a. disappearance experiment: add 1-2 cm steel plates Uniform detector technology

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