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
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]
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
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 3
RPC test setup
Telescope
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
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 5
NIM and CAMAC electronics
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 6
Telescope rate monitoring
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225000235000
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Time, Hours
Padd
le ra
tes
120000
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Time, Hours
Padd
le ra
tes
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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
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 7
Gas mixing unit
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 8
Typical efficiency plot
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 9
Studies with gas mixtures
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 10
Typical timing distribution plot
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 11
Typical time response plot
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 12
Typical time resolution plot
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 13
Typical charge distribution plots
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 14
Typical mean charge plot
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 15
Typical noise rate plot
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 16
Typical cross-talk plots
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
The 6th ACFA Workshop on Physics and Detector at Linear Collider, TIFR, Mumbai, December 15-17, 2003 18
Effects of wet gases
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.
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
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