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electrical simulation of August09 counters

electrical simulation of August09 counters. Diego González-Díaz. Tsinghua 1m-long counter with walls. electrical scheme of the RPC in working conditions. FEE. w wall =1mm. w gap =4mm. w=25mm. ~∞. ~∞. insulator, h ins ~0. d=0.7mm ε r =7.5. 6 gaps (g=0.22mm, ε r =1). HV,

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electrical simulation of August09 counters

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  1. electrical simulation of August09 counters Diego González-Díaz

  2. Tsinghua 1m-long counter with walls

  3. electrical scheme of the RPC in working conditions FEE wwall =1mm wgap =4mm w=25mm ~∞ ~∞ insulator, hins~0 d=0.7mm εr=7.5 6 gaps (g=0.22mm, εr=1) HV, hHV~0 .... hpcb=1.5mm εr=4.7 ~∞ grounded at RPC end grounded at FEE input L=94 cm transverse section

  4. electrical scheme used for validation of simulation victims source R=50Ω .... floating grounded at LEMO cable transverse section

  5. Zdet~37.5 anode 1 cathode 1 50 anode 2 cathode 2 50 50 anode 3 cathode 3 50 50 anode 4 cathode 4 anode 5 cathode 5 anode 5 cathode 5

  6. USTC 0.5m-long counter without walls and mirrored

  7. electrical scheme of the RPC in working conditions wgap =6mm w=25mm ~∞ ~∞ insulator, hins~0 d=0.7mm εr=7.5 5 gaps (g=0.22mm, εr=1) HV, hHV~0 .... FEE .... 5 gaps hpcb=0.8mm εr=4.7 grounded at FEE input ~∞ L=52.5 cm transverse section

  8. Zdet~20.5 anode 1 cathode 1 50 anode 2 cathode 2 50 50 anode 3 cathode 3 50 50 anode 4 cathode 4 anode 5 cathode 5 anode 5 cathode 5

  9. Preliminary results: only charge sharing Tsinghua 1m-long counter with walls

  10. weighting field

  11. Efficiency profile (I)

  12. Efficiency profile (II)

  13. Efficiency profile with broad trigger (1cm) (I)

  14. Efficiency profile with broad trigger (1cm) (II)

  15. average charge (I)

  16. average charge with broad trigger (1 cm) (II)

  17. Not so preliminary results

  18. Scan in HV

  19. P. Fonte's long counter Free parameters: Qth=30fC reported Qth=[10-30fC]

  20. Tsinghua's short counter Free parameters: Qth=150fC Not reported! for slow electronics Qth=[50-150fC] are not strange (NINO).

  21. USTC 50-cm counter Free parameters: Qth=150fC

  22. Heidelberg counter Qth=60fC (measured) Free parameters: 1kV effective drop in the applied voltage must be assumed (?)

  23. Scan in transverse coordinate (cross-talk is included from APLAC simulations in each particular configuration!)

  24. Tsinghua's short counter • Free • parameters: • trigger region • (2 cm – nominal) • Cross-talk fuzzy factor x1.7

  25. Tsinghua's short counter

  26. USTC 50-cm counter • Free • parameters: • trigger region • (2 cm – nominal) • Cross-talk fuzzy factor x1.7

  27. USTC 50-cm counter

  28. Free • parameters: • trigger region • (2 cm – nominal) • Cross-talk fuzzy factor x0.6

  29. P. Fonte's long counter cross-talk fuzzy factor: 0.4

  30. Conclusions • A new RPC simulator is available: • The simulator can approximate the behavior of a large range of systematic measurements for completely different detector geometries. • A first quantitative description of charge-sharing has been attempted. Detectors with little inter-strip spacing and/or shielding can be reasonably described by the used analytical formulas. Accurate comparison in other cases requires to use different tools (work in progress). • A first quantitative description of charge-sharing has been attempted by using APLAC to estimate the fraction of signal coupled to the neighbors. The data can not be described unless extra factors amounting to x0.4 (Fonte-large), x0.6 (Heidelberg) and x1.7 (Tsinghua/USTC) are introduced. The cross-talk simulation is very sensitive to the whole structure + electronics and it is still difficult to make safe predictions. The best practical approach seems to be to simulate the situation and ensure that the cross-talk is not a problem even for x2-3 more cross-talk than simulated (engineering approach). This is not yet my final word!. • There are plenty of things that can be done with existing data still in order to help us understand what is going on and debugging the simulator.

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