Transcript RPC_material

List of materials for Forward
Endcap RPCs
D. Piccolo INFN Napoli
D. Piccolo INFN
Napoli
Pisa meeting january 18-20 2001
Chambers and strips numerology
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18 (layers) x 3 (chambers) x 2 (doors) =
108 chambers = 216 modules (432 in
all bigaps solution)
Top
chambers
Different shapes
– top chambers: 3 + 12 + 1 + 1 + 1;
– middle chambers: 18 different
shapes;
– bottom chambers: 15 + 1 + 1 + 1;
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Number of horizontal strips:
32/module
Number of vertical strips (top and
bottom chambers): 64/chamber;
Number of vertical strips (middle
chambers): 55 to 80 per chamber
according to layer number
D. Piccolo INFN
Napoli
Horizontal
strips
module
Middle
chambers
Bottom
chambers
Pisa meeting january 18-20 2001
vertical
strips
List of materials
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Bakelite
carbon coating
PVC films
polycarbonate spacers
frame (polycarbonate/G10)
gas tubes and inlets
strips and cables from strips
foam
HV connection
D. Piccolo INFN
Napoli
Pisa meeting january 18-20 2001
Bakelite
Graphite paint
• Celfen 2 produced by PanPla
Italy
• maximum size: 1.6 x 3.2 m^2
• thickness: 2.00 +- 0.17 mm
• Resistivity range used for
BaBar: 1-6 10^11 ohm cm
D. Piccolo INFN
Napoli
• DAG 305 solved in MIBK
produced by Akeson, about
100 k /•
Insulating film
• polyetilenterephtalate (mylar):
DIEPOL produced by Effegidi
S.p.A.
• thickness: 190 um
Pisa meeting january 18-20 2001
1 cm
Hot
melt
2 mm
G10 edge frame
7 mm
Gas tubes
Spacers
• polycarbonate
• thickness: 2.000+-0.015 mm
• teflon tube (4 mm inner
diameter, 6 mm outer diameter
to 1/4 inch on bubbler)
gas inlet
• polycarbonate
edge frame
• G10 (for Babar RPCs)
• polycarbonate (for last 24 RPCs
installed inside forward endcap)
Gas out
Gas in
D. Piccolo INFN
Napoli
Pisa meeting january 18-20 2001
Strips
• 190 m mylar + 18 m copper
(strips side)
• 50 m mylar + 18 m copper
(gnd side)
• 2 K resistor between strip and
ground.
Ground
wire
Foam
• styrofoam produced by Dow
Chemical Company
• thickness: 4 mm for old RPCs,
3 mm for new RPCs
Cable from strips to FEC
• 34 wires twisted flat cables
– between 4 and 6 mt length for
each 16 strips
D. Piccolo INFN
Napoli
strip pitch
• vertical strips: 3.8 cm
• horizontal strips: 2.8 cm
• inter-strip distance: 2 mm
Pisa meeting january 18-20 2001
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HV connection
conductive epoxy
tinned copper sticker
mylar protection
cable: 22 gauge tinned
copper, pvc jacket.
Produced by Belden
D. Piccolo INFN
Napoli
Pisa meeting january 18-20 2001