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

6

8

10

12

14

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

120

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

4

8

12

-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