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Limitations on Microstrip Ladder Length

Limitations on Microstrip Ladder Length. International Workshop on Future Linear Colliders University of Tokyo, 11-15 November 2013 Bruce Schumm Santa Cruz Institute for Particle Physics. Study involved: Measurements of readout noise vs. strip load

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Limitations on Microstrip Ladder Length

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  1. Limitations on Microstrip Ladder Length International Workshop on Future Linear Colliders University of Tokyo, 11-15 November 2013 Bruce Schumm Santa Cruz Institute for Particle Physics

  2. Study involved: • Measurements of readout noise vs. strip load • SPICE-level simulation of readout noise, including network effects • Pulse-development simulation to determine operating point and length limitations

  3. Series Resistance Parallel Resistance Amplifier Noise (parallel) Amplifier Noise (series) Dominant term for long ladders (grows as L3/2) Standard Form for Readout Noise (Spieler) Fi , Fv are signal shape parameters that can be determined from average scope traces.  Expression assumes single, lumped R, C load element; in fact, microstrip electrode is a distributed network

  4. Sensor “Snake” Sensor “Snake”: Read out up to 13 daisy-chained 5cm sensors (with LSTFE-1 ASIC) LSTFE1 chip on Readout Board ( =1.8 s) Can read out from end, or from middle of chain (“center-tap”)

  5. Ladder properties

  6. Aspects of simulation

  7. Pulse Development Simulation Long Shaping-Time Limit: strip sees signal if and only if hole is collected onto strip (no electrostatic coupling to neighboring strips) Include:Landau deposition (SSSimSide; Gerry Lynch LBNL), variable geometry, Lorentz angle, carrier diffusion, electronic noise and digitization effects

  8. Expected Noise vs. Ladder Length Series noise expected to dominate for narrow (50 m) pitch sensors above ~25 cm long

  9. PSpice predictions End readout (include network effects) Center tap First-Pass Results vs. Expectations (old…) Expected for end readout (Spieler formulation) Observed: End readout Center tap But: need to add in amplifier noise…

  10. Observed noise Simulation, with LSTFE series and parallel noise Network values: 65 pF; 3700  Simulation, with LSTFE series noise only Include realistic feedback network; measured LSTFE-I noise (LSTFE-II now known to be similar) Good agreement; significantly less than naïve expectation Need to look at “center-tap” readout next.

  11. Wrap-Up Time-Over-Threshold Readout (LSTFE) Second prototype under study in lab; functionality looks good (except for power cycling) Long Ladder Readout Noise: Measurements show much lower noise than naïve (lumped-element) analysis. Now confirmed with simulation  promising for long-ladder solutions. Non-Prompt Tracks with SiD: Extended radial range of stau decay kinks from 21-46 cm to 6-46 cm, maintaining good efficiency and purity. Exploring 46-71 cm range.

  12. (No) Backup Slides

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