development of rpcs for ino
DESCRIPTION
Development of RPCs for INO. B.Satyanarayana TIFR, Mumbai, INDIA [email protected]. Principle of operation. RPC test setup. Telescope. Cosmic muon trigger and timing. NIM and CAMAC electronics. Telescope rate monitoring. Gas mixing unit. Typical efficiency plot. Studies with gas mixtures. - PowerPoint PPT PresentationTRANSCRIPT
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 1
Development of RPCs for INO
B.Satyanarayana
TIFR, Mumbai, [email protected]
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 2
A passing charged particle induces an avalanche, which develops into a spark. The discharge is quenched when all of the locally ( ) available charge is consumed.
2cm 1.0r
The discharged area recharges slowly through the high-resistivity glass plates.
Before spark After spark
Signal pickup(X)
Signal pickup(Y)
GlassPlates
Graphite
Graphite
Spacer
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Principle of operation
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 3
RPC test setup
Telescope
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 4
P1P2
P3
P4P5
P6
RPC under test
Muon Trigger =654321 PPPPPP
Cosmic muon trigger and timing
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 5
NIM and CAMAC electronics
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 6
Telescope rate monitoring
215000
225000235000
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255000265000
275000
1 4 7 10 13 16 19 22 25 28 31 34 37 40
Time, Hours
Padd
le ra
tes
120000
125000
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135000
140000
145000
150000
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Time, Hours
Padd
le ra
tes
32000
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37000
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Time, Hours
Pad
dle
rate
s
150
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1 4 7 10 13 16 19 22 25 28 31 34 37 40
Time, Hours
Trig
ger r
ates
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 7
Gas mixing unit
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 8
Typical efficiency plot
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 9
Studies with gas mixtures
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 10
Typical timing distribution plot
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 11
Typical time response plot
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 12
Typical time resolution plot
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 13
Typical charge distribution plots
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 14
Typical mean charge plot
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 15
Typical noise rate plot
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 16
Typical cross-talk plots
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 17
Summary of cross-talk measurements
Gas Mixture Slit Size(mm) Cross talk(%)
62:8:30 10 6.8
62:8:30 15 6.7
62:8:30 20 6.2
57:8:35 20 6.5
52:8:40 20 5.9
46:8:46 20 6.3
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 18
Effects of wet gases
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 19
Recovering a damaged RPC
• Purging with pure Argon at high flow rate.• Bubbling pure Argon through pure ethyl
alcohol.• Bubbling pure Argon through 25% Ammonia
solution for 24 hours without electric field.• Recovers efficiency and brings down noise rate.• Detailed studies underway.
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 20
RPC recovery plots
No of hours of gas flow
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The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 21
Future plans
• Study of effect of wet gases on RPC performance, aging etc.
• Study of pickup strip materials, geometries & pulse characteristics
• Long term studies with small chambers.• Improvements in the gas mixing unit, Cosmic test
setup, etc.• Procurement of dry gases.• Production of 120cm X 90cm RPCs for prototype
detector