Diamond Research Status in Minsk Group
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Transcript of Diamond Research Status in Minsk Group
Diamond Research Status in Minsk Group
NC PHEP BSU, Minsk K.AfanacievI.EmeliantchikA.IgnatenkoA.Litomin
Institute of Electronicsof Belarussian Academy of Science, Minsk
K.Delendik
DESY Zeuthen W.LangeW.Lohmann
IV WorkshopInstrumentation of the Forward Region of a Linear Collider Detector
Zeuthen, GermanyAugust 26 - 28, 2004
Presented by Igor Emeliantchik
Two Directions of Activity:
1. Attempt to create a particle detector on the base of monocrystalline syntheticdiamond of Minsk production
2. Research on diamonds of Freiburg production
Monocrystalline Diamond Detector of Minsk Production
•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 detectoris currently investigated.
Test of Minsk Diamond in Zeuthen
Charge Collection Distance Versus Bias Voltage
0
2
4
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0 100 200 300 400 500
U_bias, V
CC
D, u
m
Charge collection distance is approximately the same as that of Freiburg diamonds
Test of Minsk Diamond in CERN
Test was performed with PS accelerator, T7 beam siteFast extraction mode was usedNumber 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.
Test of Freiburg Diamonds at PITZ
Diamond
Diamond is located outside the beam tube and registers secondary -quanta
Dark Current Measurement with Diamond Detectors at PITZ
OpAmpAD829
Output
HV
Diamond
1st diamond (near the cavity)
2nd diamond (near the tube, 70cm away from the cavity)
Readout circuit
Diamond response to the cavity dark current
0
30
60
90
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0 100 200 300 400
main solenoid current (A)
sign
al f
rom
dia
mon
d de
tect
ors
(mV
)
detector 1 (on waveguide) at SPV23detector 2 (on diagnostic cross) at SPV23detector 1 (on waveguide) at SPV17detector 2 (on diagnostic cross) at SPV17
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
Minsk Monocrystalline Diamond at PITZ
Diamond Response Versus Bias Voltage
-12
-8
-4
0
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-400 -300 -200 -100 0 100 200 300 400 500
U_bias, V
Re
lati
ve U
nit
sCavity dark current, registeredwith Minsk monocrystalline diamond
Conclusions
Monolithic diamond of Minsk production remains a valid option of a sensorfor Beamcal
Our diamond detectors are already mature enough to try practical applicationslike beam monitoring