Short ( and incomplete) characteristics of CVD diamond detectors Diamond as a detector material • low dielectric constant low capacity low noise • good heat conductivity ( 5 x higher than Cu ) • large band gap of 5.5 eV small signal (< half of a Si of similar size) • high charge carrier velocity saturation fast pulse response time Diamond Crystal production • chemical vapour deposition (CVD) commercial production • polycrystaline diamonds (PCD) thickness 0.5-500m max size ~ 5x5cm 2 price ? (100 euro/det.) • single crystal diamond (SCD) smaller ( 4x4 mm 2 ) better performance (energy resolution) more expensive (5xPCD) Diamond detectors performance • very fast timing pulse risetime: 200 ps width: 2ns (PCD) 5ns (SCD) • operating voltage 1 V/m • radiation hardness -Tests with 2x10 15 p/cm 2 did not show any significant deterioration of a sig./noise -pumping effect (PCD) : improvement with increasing dose • position resolution below 10m can be achieved with strip detectors X and Y • efficiency 70%PCD-100% PCD • Diamonds as TOF detectors tests with 1GeV/u U beam resulted in TOF of =20 ps Cr-Au foil ~0.1m
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Short ( and incomplete) characteristics of CVD diamond detectors
Diamond as a detector material • low dielectric constant
low capacity
low noise • good heat conductivity
( 5 x higher than Cu )• large band gap of 5.5 eV
small signal (< half of a Si of similar size)
• high charge carrier velocity saturation
fast pulse response time
Diamond Crystal production• chemical vapour deposition (CVD)
commercial production• polycrystaline diamonds (PCD)
thickness 0.5-500m
max size ~ 5x5cm2
price ? (100 euro/det.)• single crystal diamond (SCD)
smaller ( 4x4 mm2)
better performance (energy resolution)
more expensive (5xPCD)
Diamond detectors performance• very fast timing
pulse risetime: 200 ps
width: 2ns (PCD) 5ns (SCD)• operating voltage 1 V/m• radiation hardness
-Tests with 2x1015 p/cm2 did not show any significant deterioration of a sig./noise
-pumping effect (PCD) : improvement with increasing dose• position resolution
below 10m can be achieved with strip detectors X and Y• efficiency
70%PCD-100% PCD• Diamonds as TOF detectors
tests with 1GeV/u U beam resulted in TOF of =20 ps
Cr-Au foil ~0.1m
http://rd42.web.cern.ch/RD42/
http://www-norhdia.gsi.de
INFN-MI, Milano, Italy Electronics, ToF-detectorsCEA-Saclay, France diamond growth, sensor modelling DESY-Zeuthen, Germany E-, ToF-detectors, modelling, electronics GSI, Darmstadt, Germany E-, ToF-dectors, irradiations, detector characterisation, micro-beam mappingIFIN-HH, Bucharest, Romania Electronics, ToF-detectors, modellingCERN, Geneva, Switzerland Detector characterisation Karlsruhe University, Germany Detector characterization, irradiations IJS, Ljubljana, Slovenia Irradiations VERA Laboratory, Vienna, Austria E-detectors Wits University, Johannesburg, South Africa Diamond substratesKurchatov Institute, Moscow, Russia ESRF Grenoble, France sample characterisationAIST, Tsukuba, JapanIndustrial partners: Element six, Ascot, Berkshire, UK ideas
Coordinator:E. Berdermann (GSI)
•News from I3HP & NoRHDia - Eleni Berdermann
•News from I3HP & NoRHDia - Eleni Berdermann
But for PCD much worst !
•SC-Diamond for ToF measurements with relativistic particles: First beam test with 27Al ions of 2 GeV/amu - Mladen Kis
•SC-Diamond for ToF measurements with relativistic particles: First beam test with 27Al ions of 2 GeV/amu - Mladen Kis
• But at 5 MeV/u a middle-light (A ~20) HI beam stops in ~ 50 m of a diamond layer
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