A new type of scintillation detectors for the mountain cosmic ray complex ATHLET is designed at the Institute for High Energy Physics (IHEP). The detector is implemented on the basis of 10
mm thick ...molded polystyrene plates in conjunction with wavelength shifting fibers. It has a
1
×
1
m
2
sensitive area,
∼
99
%
registration efficiency of charged particles and a homogeneity of the scintillation light output better than 90%. Due to its relatively low mass and cost characteristics and the absence of an external high-voltage power source it suits well for the use in wide-spread multi-channel extensive air shower installations.
A new type of scintillation detector for shower arrays is considered. The detector represents an octagonal scintillation assembly with total area 1
m
2 divided into sectors. Thickness of the plastic ...is 20
mm. The light is collected by wavelength shifter bars to the photomultiplier, which is located in the center of the detector. A solution to ensure the uniformity of light collection for any coordinate is proposed. Front-end electronics of the detector consists of the controller, the measuring part (QDC, TDC), the system of calibration and the HV converter. The data acquisition system is based on CAN-open standard. There is also a system of temperature stabilization that guarantees not more than 0.5° deviation of the temperature of measuring part elements. Measuring electronics allows obtaining the dynamic range from 1 up to 10
4 particles and 1
ns time digitization. The time resolution of the detector is about 3
ns.
LHCb calorimeters high voltage system Gilitsky, Yu; Golutvin, A.; Konoplyannikov, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2007, Letnik:
571, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The calorimeter system in LHCb aims to identify electrons, photons and hadrons. All calorimeters are equipped with Hamamatsu photo tubes as devices for light to signal conversion. Eight thousand ...R7899-20 tubes are used for electromagnetic and hadronic calorimeters and two hundred 64 channels multi-anode R7600-00-M64 for Scintillator-Pad/Preshower detectors. The calorimeter high voltage (HV) system is based on a Cockroft Walton (CW) voltage converter and a control board connected to the Experiment Control System (ECS) by serial bus. The base of each photomultiplier tube (PMT) is built with a high voltage converter and constructed on an individual printed circuit board, using compact surface mount components. The base is attached directly to the PMT. There are no HV cables in the system. A Field Programmable Gate Array (FPGA) is used on the control board as an interface between the ECS and the 200 control channels. The FPGA includes also additional functionalities allowing automated monitoring and ramp up of the high voltage values. This paper describes the HV system architecture, some technical details of the electronics implementation and summarizes the system performance. This safe and low power consumption HV electronic system for the photomultiplier tubes can be used for various biomedical apparatus too.
The electromagnetic calorimeter of the HERA-B experiment Avoni, G.; Baldanza, C.; Bertin, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2007, Letnik:
580, Številka:
3
Journal Article
Recenzirano
Odprti dostop
The electromagnetic calorimeter of the
HERA-B experiment built at the HERA proton accelerator at DESY (Hamburg) is described. The construction characteristics of the detector, of the related ...front-end, readout, trigger and service electronics are discussed together with the constraints and the motivations which inspired the design philosophy. The detector performance are presented as obtained from the analysis of the data acquired during the
HERA-B running period, including calibration procedures and achievements and the electron identification capability exploiting a method, proposed here for the first time, based on the observation of the associated bremsstrahlung
γ
. Finally, some observed physical signals and a short overview of the main obtained physics results are presented.
A neutron detector on the basis of a boron-containing plastic scintillator Britvich, G.I.; Vasil’chenko, V.G.; Gilitsky, Yu.V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2005, Letnik:
550, Številka:
1
Journal Article
Recenzirano
Characteristics of construction elements and investigation results of a prototype of a fast neutron detector are described. The detector prototype is based on a boron-containing molded plastic ...scintillator
SC-331 manufactured in IHEP. The use of this scintillator for neutron detection ensures a capacity to work under high loading rates with a relatively low level of registered background events. The newly created detector may be used for neutron flux measurements in extensive air showers.
The design of the phototube power supply for the HERA-
B
Electromagnetic Calorimeter is presented. A choice of the solution on the basis of the Cockcroft–Walton voltage multiplier is validated. ...Schematics developed are discussed. A special section describes the behaviour of the crucial components under irradiation since radiation tolerance becomes one of the most important items in the severe HERA-
B
radiation environment. Finally, performance achieved is presented.
The performance of a gas electromagnetic calorimeter Bezzubov, V; Denisov, S; Erin, S ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2004, Letnik:
525, Številka:
1
Journal Article
Recenzirano
Characteristics of the gas ionisation electromagnetic (EM) calorimeters with 1.5 and
3
mm
lead absorbers has been studied using 6–
30
GeV
electron beams of the IHEP accelerator. The calorimeters were ...filled with heavy freon C
3F
8. The results of the electronics noise measurements are presented. The dependencies of the average signal and the energy resolution on the beam energy, gas pressure and high voltage are discussed.
K{sup {+-} {yields} }e{sup {+-}{nu}{pi}0} decays have been studied using the KMN setup at the Institute for High Energy Physics (Protvino). The experiment has been performed in the 36-GeV/c hadron ...beams of the IHEP accelerator. The accumulated data allow us to select {approx}1.08M candidates for K{sub e3} decays. Analyzing the Dalitz plot of these events, we estimate the linear slope of the charge form factor to be {lambda}{sub +} = 30.44 {+-} 0.83(stat.) {+-} 0.74(syst.) x 10{sup -3}.
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