New results on MRS APDs Akindinov, A.V.; Martemianov, A.N.; Polozov, P.A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/1997, Letnik:
387, Številka:
1
Journal Article
Recenzirano
Characterisation of recently developed at CPTA for high-energy and medical physics applications MRS (Metal-Resistive layer-Semiconductor) APDs was done at ITEP. Special emphasis in the new design was ...made on improvement of time characteristics and photosensitivity in green wavelength. Response of detectors to β-, γ-sources and LEDs has been studied. Gain (up to 10
5) has been measured as a function of temperature and voltage. Good separation of 1-, 2-, etc. photoelectron peaks was observed in spectra at room temperature. No ageing of the detectors throughout several months operation under continuous strong illumination has been observed. Possible applications of detectors are discussed.
We have investigated the operation of the multigap resistive plate chamber (MRPC) for the ALICE-TOF system with a gas mixture free of flammable components. Two different gas mixtures, with and ...without iso-C
4H
10 have been used to measure the performance of the MRPC. The efficiency, time resolution, total charge, and the fast to total charge ratio have been found to be comparable.
The Transition Radiation Detector (TRD) was designed and built to enhance the capabilities of the ALICE detector at the Large Hadron Collider (LHC). While aimed at providing electron identification ...and triggering, the TRD also contributes significantly to the track reconstruction and calibration in the central barrel of ALICE. In this paper the design, construction, operation, and performance of this detector are discussed. A pion rejection factor of up to 410 is achieved at a momentum of 1 GeV/ in p–Pb collisions and the resolution at high transverse momentum improves by about 40% when including the TRD information in track reconstruction. The triggering capability is demonstrated both for jet, light nuclei, and electron selection.
The Protvino accelerator facility located in the Moscow region, Russia, is in a good position to offer a rich experimental research program in the field of neutrino physics. Of particular interest is ...the possibility to direct a neutrino beam from Protvino towards the KM3NeT/ORCA detector, which is currently under construction in the Mediterranean Sea 40 km offshore Toulon, France. This proposal is known as P2O. Thanks to its baseline of 2595 km, this experiment would yield an unparalleled sensitivity to matter effects in the Earth, allowing for the determination of the neutrino mass ordering with a high level of certainty after only a few years of running at a modest beam intensity of \(\approx\) 90 kW. With a prolonged exposure (\(\approx\) 1500 kW*yr), a 2\(\sigma\) sensitivity to the leptonic CP-violating Dirac phase can be achieved. A second stage of the experiment, comprising a further intensity upgrade of the accelerator complex and a densified version of the ORCA detector (Super-ORCA), would allow for up to a 6\(\sigma\) sensitivity to CP violation and a 10\(^\circ\)-17\(^\circ\) resolution on the CP phase after 10 years of running with a 450 kW beam, competitive with other planned experiments. The initial composition and energy spectrum of the neutrino beam would need to be monitored by a near detector, to be constructed several hundred meters downstream from the proton beam target. The same neutrino beam and near detector set-up would also allow for neutrino-nucleus cross section measurements to be performed. A short-baseline sterile neutrino search experiment would also be possible.
AbstractA procedure developed to achieve particle identification in very high multiplicity conditions using a complex time-of-flight system is illustrated in detail by simulating and studying the ...performance of the ALICE TOF detector in a realistic scenario of Pb-Pb and p-p interactions at LHC.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
We have investigated the operation of the Multigap Resistive Plate Chamber (MRPC) for the ALICE-TOF system with a gas mixture free of flammable components. Two different gas mixtures, with and ...without iso-C4H10have been used to measure the performance of the MRPC. The efficiency, time resolution, total charge, and the fast to total charge ratio have been found to be comparable.
The ALICE Time-Of-Flight (TOF) detector is a cylindrical array with a total area of about 150
m
2 and more than 153,000 readout channels; it will allow charged hadron separation for momentum up to a ...few GeV/
c. The very good performance required for such a system has been achieved by means of the Multigap Resistive Plate Chamber (MRPC) whose time resolution is better than 50
ps with an overall efficiency close to 100%. The TOF detector is fully installed since April 2008; it has successfully been operated during cosmic ray data taking. The very good stability, noise level and time performance are reported here. The status of the calibration and the first physics results with the TOF detector are given.
Final test of the MRPC production for the ALICE TOF detector Akindinov, A.; Alici, A.; Antonioli, P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2009, Letnik:
602, Številka:
3
Journal Article
Recenzirano
Odprti dostop
During the autumn of 2006 a final test of a sample of double-stack MRPC (Multigap Resistive Plate Chamber) strips, randomly chosen from two years of mass production (the ALICE Time-Of-Flight detector ...is made of 1638 strips), was carried out at the CERN Proton Synchrotron facility. The results on the performances of the MRPCs and of the front-end and readout electronics will be presented. It is confirmed that these devices have a very good uniformity of response, a long streamer-free plateau, an efficiency higher than 99% and an “intrinsic” time resolution better than about 40
ps.
Usage of electrodes made of glass with low bulk resistivity seems to be a promising way to adapt the Resistive Plate Chambers (RPC) to the high-rate environment of the upcoming CBM experiment. A ...pilot four-gap RPC sample with electrodes made of phosphate glass, which has bulk resistivity in the order of 1010Ωcm, has been studied with MIP beam for TOF applications. The tests have yielded satisfactory results: the efficiency remains above 95% and the time resolution stays within 120ps up to the particle rate of 18kHz/cm2. The increase in rate from 2.25 to 18kHz/cm2 leads to an increase of estimated tails fraction in the time spectrum from 1.5% to 4%.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).The ALICE Collaboration at the LHC has measured the J/ psi and psi ' photoproduction at mid-rapidity in ultra-peripheral ...Pb-Pb collisions at ... The charmonium is identified via its leptonic decay for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 23 mu b super(-1). The cross section for coherent and incoherent J/ psi production in the rapidity interval -0.9<y<0.9, are ... and ..., respectively. The results are compared to theoretical models for J/ psi production and the coherent cross section is found to be in good agreement with those models incorporating moderate nuclear gluon shadowing at Bjorken-x around 10 super(-3), such as EPS09 parametrization. In addition the cross section for the process gamma gamma arrow right e super(+) e super(-) has been measured and found to be in agreement with models implementing QED at leading order.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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