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

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Current Status of Diamond Sensors Research Laboratory tests with 90 Sr: Charge collection efficiency of 20% Next step: first prototype for beam tests Beam tests planned: PITZ ate first, then CERN, HERA, TTF2

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Typical spectrum of x-ray tube. Something similar can be expected at sensor location What should we expect at PITZ? 5MeV

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Diamond Sensor and  -quanta Probability of photon interaction within 300  m 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, 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

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Time Structure of the Beam at PITZ So, we need fast electronics, able to operate at 100ns bunch rate with minimum noise

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Readout Electronics for Beam Tests of Diamond Sensors Diamond Metallized plastic box CSP “Tetrod” R fb C fb C ca l 50  OpAmp AD829 Test Output Charge-sensitive preamplifier “Tetrod” is a low-noise one-channel monolythic IC, developed at NC PHEP (Minsk), and produced by microelectronics plant “Integral” (Minsk)

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 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

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Tetrod-BJT amplifier

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Oscillograms of Tetrod-BJT Amplifier 20ns/div Preamp output Shaper output

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Performance of Tetrod-BJT Amplifier Noise Linearity

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 Performance of Tetrod-jFET amplifier Noise Linearity

Instrumentation of the Forward Region for a Linear Collider Detector Prague, April , 2004 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