Upload
emerson-nieves
View
34
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Cross-talk in strip RPCs. D. Gonzalez-Diaz, A. Berezutskiy and M. Ciobanu with the collaboration of N. Majumdar, S. Mukhopadhyay, S. Bhattacharya (thanks to A. Blanco for providing us with HADES cells) 10-03-2009. Index. 1. Single strip parameters and the RPC as a current generator. - PowerPoint PPT Presentation
Citation preview
Cross-talk in strip RPCs
D. Gonzalez-Diaz, A. Berezutskiy and M. Ciobanu
with the collaboration of N. Majumdar, S. Mukhopadhyay, S. Bhattacharya
(thanks to A. Blanco for providing us with HADES cells)
10-03-2009
Index
1. Single strip parameters and the RPC as a current generator.
2. The induction profile.
3. The Boundary Element Method (BEM).
4. Propagation.
5. Conclusions.
The RPC as a current generator. Signal shape.
P. Fonte, private communicationP. Fonte et al., IEEE, Trans. Nucl. Sci. 49, 3(2002)881.Diego Gonzalez Diaz, PhD. Thesis, Santiago de Compostela(2006), 2006 JINST TH 003
picture fromC. Lippmann'sPhD
T. Heubrandtner et al. NIM A 489(2002)439fast convergent analytical formula known since
What is the weighting field?
Multi-strip-MRPC (MMRPC)
1.1 mm
Glass: ε=7.5, strip width = 1.64 mm, strip gap = 0.9 mm, strip length = 900 mm
1.1 mm
0.5 mm
0.22 mm
copper (20 μm)
A relevant example. The FOPI multi-strip design.
strip width = 22 mm, gap to next strip = 3 mm, length = 220 mm
glass (εr=7.5, h=0.5 mm)
graphite (εr=12, h=0.02 mm)
gas (εr=1, h=0.2 mm)
PCB (εr=5, h=0.86 mm)
Cu strip (h=0.018 mm)(placed in the middle ofthe PCB)
CBM version 1 (strip region)12 gaps
strip width = 22 mm, gap to next strip = 3 mm, length = 220 mmguard strips (1 mm)
glass (εr=7.5, h=0.5 mm)
graphite (εr=12, h=0.02 mm)
gas (εr=1, h=0.2 mm)
PCB (εr=5, h=0.86 mm)
Cu strip (h=0.018 mm)(placed in the middle ofthe PCB)
CBM version 2 (strip region)12 gaps
strip width = 22 mm, gap to next strip = 3 mm, length = 220 mmguard walls (1 mm)
glass (εr=7.5, h=0.5 mm)
graphite (εr=12, h=0.02 mm)
gas (εr=1, h=0.2 mm)
PCB (εr=5, h=0.86 mm)
Cu strip (h=0.018 mm)(placed in the middle ofthe PCB)
CBM version 3 (strip region)12 gaps
1. Generate events with the RPC signal shape and amplitude distribution starting from measured values. On the way.
2. Calculate the fraction of signal induced to each strip. On the way.
3. Calculate cross-talk in the propagation for the given strips, treating them as current generators. On the way.
4. Compare with RPC oscillograms and/or digitized beam data. On the way.
5. Introduce this knowledge in CBM-root in order to do a meaningful design. To be done.
Conclusions
We are progressing in the direction of having a reasonable electromagnetic simulator for RPC
design !
simulation of the S coefficient
scattering matrix coefficient to neighbouring anode (equivalently: fraction of signal transmitted)
simulation of a realistic structure
propagation of exponential signal with 200 ps rise-time in anode and cathode simultaneously (differential mode)
RPC structure: strip width = 2.2 cm, gap to next strip = 0.3 cm
16 gaps,0.16 mm gap0.3 mm glass0.86 mm PCB