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Titolo:
IN-BEAM EXPERIENCE FROM THE CERES UV-DETECTORS - PROHIBITIVE SPARK BREAKDOWN IN MULTISTEP PARALLEL-PLATE CHAMBERS AS COMPARED TO WIRE CHAMBERS
Autore:
BAUR R; DREES A; FISCHER P; FRAENKEL Z; GLASSEL P; KLEIN H; PFEIFFER A; SCHON A; SHOR A; SPECHT HJ; STEINER V; TSERRUYA I; ULLRICH TS;
Indirizzi:
UNIV HEIDELBERG W-6900 HEIDELBERG GERMANY UNIV HEIDELBERG W-6900 HEIDELBERG GERMANY WEIZMANN INST SCI IL-76100 REHOVOT ISRAEL
Titolo Testata:
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
fascicolo: 1, volume: 343, anno: 1994,
pagine: 231 - 240
SICI:
0168-9002(1994)343:1<231:IEFTCU>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
AVALANCHE CHAMBER; PROPORTIONAL CHAMBER; TMAE; PHOTOCATHODE; COUNTERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
R. Baur et al., "IN-BEAM EXPERIENCE FROM THE CERES UV-DETECTORS - PROHIBITIVE SPARK BREAKDOWN IN MULTISTEP PARALLEL-PLATE CHAMBERS AS COMPARED TO WIRE CHAMBERS", Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 343(1), 1994, pp. 231-240

Abstract

The UV-detectors of the CERES/NA45 experiment were originally conceived as parallel-plate counters with two-step amplification, an intermediate gate-electrode pair, and a final drift stage towards a pad electrode. Operated in beams of a few 10(6)/burst protons or S-32-nuclei at 200 GeV/u, this scheme was found to suffer from excessive spark rates,even in the gated mode. The origin of the sparks is quantitatively explained by event-correlated slow secondary particles, creating avalanches above the critical threshold of approximately 10(8) charges at therequired gain of a few 10(5). This lack of sufficient dynamic range is also present in other schemes proposed in the literature; it severely limits the use of large-area parallel-plate counters for single-electron detection in a realistic high-energy physics environment. Possible improvements resulting from resistive anodes instead of metal meshesare also discussed. The spark problem of the CERES UV-detectors was solved by introducing wire amplification as the last stage. Laboratory tests showed a large increase in the dynamic range, due to a strong reduction (by factors of at least 20-30) of the net gain of the wire plane for high input charges via space-charge limitation. The residual spark rates of this scheme are lower by orders of magnitude and quite acceptable even for S-32-beams; gating was found to be unnecessary.

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Documento generato il 10/07/20 alle ore 02:45:07