electrical simulation of August09 counters
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Diego González-Díaz
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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, - PowerPoint PPT Presentation
Transcript of electrical simulation of August09 counters
Diego González-Díaz
Tsinghua 1m-long counter with walls
~∞..
.. 6 gaps (g=0.22mm, εr=1)
~∞grounded at FEE input grounded at RPC end
d=0.7mmεr=7.5
HV, hHV~0
insulator, hins~0
hpcb=1.5mmεr=4.7
w=25mm
~∞wgap =4mmwwall =1mm
electrical scheme of the RPC in working conditions
FEE
L=94 cm
transverse section
....
grounded at LEMO cable
R=50Ω
floating
sourcevictims
electrical scheme used for validation of simulation
transverse section
cathode 1anode 1
cathode 2anode 2 50
cathode 350 anode 3 50
cathode 4anode 4 50
cathode 5anode 5
cathode 5anode 5
50
Zdet~37.5
USTC 0.5m-long counter without wallsand mirrored
~∞..
.. 5 gaps (g=0.22mm, εr=1)
~∞
d=0.7mmεr=7.5
HV, hHV~0
insulator, hins~0
hpcb=0.8mmεr=4.7
w=25mm~∞
wgap =6mm
electrical scheme of the RPC in working conditions
FEE
L=52.5 cm transverse section
.... 5 gaps
grounded at FEE input
cathode 1anode 1
cathode 2anode 2 50
cathode 350 anode 3 50
cathode 4anode 4 50
cathode 5anode 5
cathode 5anode 5
50
Zdet~20.5
Preliminary results: only charge sharing
Tsinghua 1m-long counter with walls
weighting field
Efficiency profile (I)
Efficiency profile (II)
Efficiency profile with broad trigger (1cm) (I)
Efficiency profile with broad trigger (1cm) (II)
average charge (I)
average charge with broad trigger (1 cm) (II)
Not so preliminaryresults
Scan in HV
Free parameters:
Qth=30fC
reportedQth=[10-30fC]
P. Fonte's long counter
Tsinghua's short counter
Free parameters:
Qth=150fC
Not reported! for slow electronics Qth=[50-150fC] are not strange (NINO).
USTC 50-cm counter
Free parameters:
Qth=150fC
Qth=60fC(measured)
Free parameters:
1kV effective drop in the appliedvoltage must be assumed (?)
Heidelberg counter
Scan in transverse coordinate
(cross-talk is included from APLAC simulations in each particular configuration!)
Free parameters:
•trigger region(2 cm – nominal)
•Cross-talk fuzzy factor x1.7
Tsinghua's short counter
Tsinghua's short counter
Free parameters:
•trigger region(2 cm – nominal)
•Cross-talk fuzzy factor x1.7
USTC 50-cm counter
USTC 50-cm counter
Free parameters:
•trigger region(2 cm – nominal)
•Cross-talk fuzzy factor x0.6
cross-talkfuzzy factor:0.4
P. Fonte's long counter
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.
