Electronics for first beam tests of diamond sensors

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Electronics for first beam tests of diamond
sensors

• Presented by Igor Emeliantchik

NC PHEP, Minsk Konstantin Afanaciev, Igor Emeliantchik Alexander Ignatenko Alexander Solin
DESY Zeuthen Hans Henschel
Instrumentation of the Forward Region for a Linear Collider Detector
Prague April 15 17, 2004
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Current Status of Diamond Sensors Research
Laboratory tests with 90Sr Charge collection
efficiency of 20
Next step first prototype for beam tests
Beam tests planned PITZ ate first, then CERN,
HERA, TTF2
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What should we expect at PITZ?
5MeV
Typical spectrum of x-ray tube. Something similar
can be expected at sensor location
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Diamond Sensor and g-quanta
Probability of photon interaction within 300 mm
of diamond sensor
Calculations are based on data compiled by W.
H.McMaster et. al. Compilation of X-ray
Cross-Sections, National Bureau of Standards, for
calculation of x-ray cross sections, http//www.cs
rri.iit.edu/periodic-table.html
Photons with energies of several keV are
expected to give main contribution. 13 eV are
needed for 1 e-hole production. Thus 1 photon
will give about 100e. So, if PITZ halo contains a
dozen or more photons with energy of several keV
per bunch, we have a chance to register it with
our diamond sensor
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Time Structure of the Beam at PITZ
So, we need fast electronics, able to operate at
100ns bunch rate with minimum noise
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Readout Electronics for Beam Tests of Diamond
Sensors
Charge-sensitive preamplifier Tetrod is a
low-noise one-channel monolythic IC, developed at
NC PHEP (Minsk), and produced by
microelectronics plant Integral (Minsk)
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Two Types of Tetrod Preamplifier IC
Tetrod-JFET preamplifier
Tetrod-BJT preamplifier
Tetrod preamplifiers were designed
for calorimetric applications, so they have big
dynamic range, at least 13 bits
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Tetrod-BJT amplifier
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Oscillograms of Tetrod-BJT Amplifier
Preamp output
20ns/div
Shaper output
20ns/div
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Performance of Tetrod-BJT Amplifier
Noise
Linearity
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Performance of Tetrod-jFET amplifier
Noise
Linearity
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Conclusions
Two amplifiers, Tetrod-BJT and Tetrod-jFET
are designed, produced, and tested. Tetrod-jFET
has slightly better noise performance. Tetrod-BJT
is faster Both amplifiers seem to be suitable
for beam tests