Diamond Research Status in Minsk Group

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Diamond Research Status in Minsk Group
Presented by Igor Emeliantchik
IV Workshop Instrumentation of the Forward Region
of a Linear Collider Detector Zeuthen,
Germany August 26 - 28, 2004
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Two Directions of Activity
1. Attempt to create a particle detector on the
base of monocrystalline synthetic diamond of
Minsk production 2. Research on diamonds of
Freiburg production
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Monocrystalline Diamond Detector of Minsk
Production
up to 8 mm

• Size 3 x 2 x 0.8 mm
• Coating Fe-Ni
• Material
• artificial monocrystalline diamond of
  instrumentation grade (nitrogen content 1019
  atom/cm3)

Crystal cutting the side facet is taken because
the base one is usually more defective (metallic
inclusions)
ADAMAS plant is also producing so called
non-nitrogen diamond (type IIA, nitrogen
content less than 1017 atom/cm3). Possibility to
use it as particle detector is currently
investigated.
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Test of Minsk Diamond in Zeuthen
Charge collection distance is approximately the
same as that of Freiburg diamonds
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Test of Minsk Diamond in CERN
Test was performed with PS accelerator, T7 beam
site Fast extraction mode was used Number of
particles per bunch was monitored with calibrated
scintillator Only very preliminary processing of
beam test results is performed so far, which
shows that the amplitude of Minsk diamond signal
was approximately the same as that of the
Freiburg diamond with 4x4 mm pad.
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Test of Freiburg Diamonds at PITZ
Diamond
Diamond is located outside the beam tube and
registers secondary ?-quanta
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Dark Current Measurement with Diamond Detectors
at PITZ
HV
Diamond
1st diamond (near the cavity)
OpAmp AD829
Output
2nd diamond (near the tube, 70cm away from the
cavity)
Readout circuit
Diamond response to the cavity dark current
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Test of the Possibility of Beam Monitoring with
Diamond Detector at PITZ
Dependence of the dark current on magnetic field
of the main solenoid, measured with diamond
detector
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Minsk Monocrystalline Diamond at PITZ
Cavity dark current, registered with Minsk
monocrystalline diamond
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Conclusions

• Monolithic diamond of Minsk production remains a
  valid option of a sensor
• for Beamcal
• Our diamond detectors are already mature enough
  to try practical applications
• like beam monitoring