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Titolo:
XSPRESS - X-RAY SIGNAL-PROCESSING ELECTRONICS FOR SOLID-STATE DETECTORS
Autore:
FARROW R; DERBYSHIRE GE; DOBSON BR; DENT AJ; BOGG D; HEADSPITH J; LAWTON R; MARTINI M; BUXTON K;
Indirizzi:
DRAL,DARESBURY LAB,KECKWICK LANE WARRINGTON WA4 4AD CHESHIRE ENGLAND
Titolo Testata:
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms
fascicolo: 1-4, volume: 97, anno: 1995,
pagine: 567 - 571
SICI:
0168-583X(1995)97:1-4<567:X-XSEF>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
R. Farrow et al., "XSPRESS - X-RAY SIGNAL-PROCESSING ELECTRONICS FOR SOLID-STATE DETECTORS", Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 97(1-4), 1995, pp. 567-571

Abstract

With recent improvements in synchrotron sources and X-ray optics great pressures have been placed on detector systems to produce higher count rates and better resolutions. Present high performance 13 element germanium detector systems can give reasonable count rates with good resolution (similar to 10(4)-10(5) Hz per channel and similar to 250 eV FWHM @ Fe-55 with 0.5 mu s shaping time). However, these systems are restricted by limitations in both the detector and in the analogue pulse processing after the detector. With respect to the detector, increasing the number of channels without degrading the energy resolution is a great challenge due to increased crosstalk and capacitance. The analogue pulse processing electronics are significantly limited by the dead time introduced by the shaping amplifier. This dead time causes pulse pile-up at higher rates which leads to non-linearity and poor resolution. This paper describes the XSPRESS system which has been developedat Daresbury Laboratory for the new Wiggler II beamline 16. This system overcomes previous limits in both signal processing and detector fabrication to give great improvements in system performance. The signalprocessing electronics departs from standard analogue processing techniques and employs sophisticated adaptive digital signal processing hardware to reduce the dead time associated with each event to a minimum. This VME based technology allows us to vastly increase the count rate for each channel yet still retain the ability to gain very good resolution. The detector has been developed through a collaborative agreement with EG and G Ortec and packs an unprecedented 30 germanium crystals into an extremely small area whilst still retaining the energy resolution of smaller arrays. This system has increased throughput rate byan order of magnitude per channel and when all channels are implemented, an increase of at least two orders of magnitude for the whole array should be seen. Data has been taken using this system on the SRS at Daresbury Laboratory and these results will be given along with a detailed explanation of the operation of this system.

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Documento generato il 26/09/20 alle ore 11:51:59