1. 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 , 2004

2. 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

3. 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.

4. Test of Minsk Diamond in Zeuthen
Charge collection distance is approximately the same as that of Freiburg diamonds

5. 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.

6. Test of Freiburg Diamonds at PITZ
Diamond is located outside the beam tube and registers secondary -quanta

7. Dark Current Measurement with Diamond Detectors at PITZHV
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

8. 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

9. Minsk Monocrystalline Diamond at PITZ
Cavity dark current, registered
with Minsk monocrystalline diamond

10. 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