Space charge in drift chambers operated with the Xe,CO2(15%) mixture Andronic, A.; Appelshäuser, H.; Blume, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2004, Letnik:
525, Številka:
3
Journal Article
We study the electron/pion identification performance of the ALICE Transition Radiation Detector (TRD) prototypes using a neural network (NN) algorithm. Measurements were carried out for particle ...momenta from 2 to 6
GeV/
c. An improvement in pion rejection by about a factor of 3 is obtained with NN compared to standard likelihood methods.
Position reconstruction in drift chambers operated with Xe, CO 2 (15%) Adler, C.; Andronic, A.; Appelshäuser, H. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2005, Letnik:
540, Številka:
1
Journal Article
Recenzirano
We present measurements of position and angular resolution of drift chambers operated with a Xe,
CO
2
(15%) mixture. The results are compared to Monte Carlo simulations and important systematic ...effects—in particular the dispersive nature of the absorption of transition radiation and non-linearities—are discussed. The measurements were carried out with prototype drift chambers of the ALICE Transition Radiation Detector, but our findings can be generalized to other drift chambers with similar geometry, where the electron drift is perpendicular to the wire planes.
We present measurements of the transition radiation (TR) spectrum produced in an irregular radiator at different electron momenta. The data are compared to simulations of TR from a regular radiator.
Space charge in drift chambers operated with the Xe,CO 2(15%) mixture Andronic, A.; Appelshäuser, H.; Blume, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2004, Letnik:
525, Številka:
3
Journal Article
Recenzirano
Using prototype modules of the ALICE Transition Radiation Detector (TRD) we investigate space-charge effects and the dependence of the pion rejection performance on the incident angle of the ionizing ...particle. The average pulse height distributions in the drift chambers operated with the Xe,CO
2(15%) mixture provide quantitative information on the gas gain reduction due to space charge accumulating during the drift of the primary ionization. Our results demonstrate that the pion rejection performance of a TRD is better for tracks which are not at normal incidence to the anode wires. We present detailed simulations of detector signals, which reproduce the measurements and lend strong support to our interpretation of the measurements in terms of space-charge effects.
We present measurements of the energy loss of pions and electrons in drift chambers (DC) operated with a Xe,CO
2(15%) mixture. The measurements are carried out for particle momenta from 1 to
6
GeV/c
...using prototype
DC for the ALICE transition radiation detectors. Microscopic calculations are performed using input parameters calculated with GEANT3. These calculations reproduce well the measured average and most probable values for pions, but a higher Fermi plateau is required in order to reproduce our electron data. The widths of the measured distributions are smaller for data compared to the calculations. The electron/pion identification performance using the energy loss is also presented.
We present pulse height measurements in drift chambers operated with Xe,CO
2 gas mixtures. We investigate the attachment of primary electrons on oxygen and SF
6 contaminants in the detection gas. The ...measurements are compared with simulations of properties of drifting electrons. We present two methods to check the gas quality: gas chromatography and
55
Fe
pulse height measurements using monitor detectors.
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