Short and incomplete characteristics of CVD diamond detectors

1
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 (lt 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 0.5-500mm
• max size 5x5cm2
• price ? (100 euro/det.)

Cr-Au foil 0.1mm

• Diamond detectors performance
• very fast timing
• pulse risetime 200 ps
• width 2ns (PCD) 5ns (SCD)
• operating voltage 1 V/mm
• 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 10mm can be achieved with strip detectors
  X and Y
• efficiency
• 70PCD-100 PCD
• Diamonds as TOF detectors
• tests with 1GeV/u U beam resulted in TOF of s20
  ps

2
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, Japan Industrial
partners Element six, Ascot, Berkshire, UK
ideas
Coordinator E. Berdermann (GSI)
3

• News from I3HP NoRHDia - Eleni Berdermann

4
But for PCD much worst !

• News from I3HP NoRHDia - Eleni Berdermann

5

• SC-Diamond for ToF measurements with relativistic
  particles
• First beam test with 27Al ions of 2 GeV/amu -
  Mladen Kis

6

• SC-Diamond for ToF measurements with relativistic
  particles
• First beam test with 27Al ions of 2 GeV/amu -
  Mladen Kis

7

• But at 5 MeV/u a middle-light (A 20) HI beam
  stops in 50 mm of a diamond layer