A LOW-NOISE CHARGE-SENSITIVE PREAMPLIFIER FOR AN X-RAY-DETECTOR OF A NB-BASED SUPERCONDUCTING TUNNEL JUNCTION

Authors
UKIBE M KISHIMOTO M KATAGIRI M KURAKADO M NAKAZAWA M
Citation
M. Ukibe et al., A LOW-NOISE CHARGE-SENSITIVE PREAMPLIFIER FOR AN X-RAY-DETECTOR OF A NB-BASED SUPERCONDUCTING TUNNEL JUNCTION, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 401(2-3), 1997, pp. 299-308
Citations number
24
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
401
Issue
2-3
Year of publication
1997
Pages
299 - 308
Database
ISI
SICI code
0168-9002(1997)401:2-3<299:ALCPFA>2.0.ZU;2-P
Abstract
A low-noise charge-sensitive preamplifier with cooled 4-JFETs was deve loped for an X-ray detector of a Nb-based superconducting tunnel junct ion with a large capacitance and a low leakage current. The low-noise characteristics for a wide range of shaping times were obtained by usi ng a selected JFET, 2SK190 in the first stage of the preamplifier. A n ew formula to simulate the preamplifier noise was developed and applie d ro tile optimization of preamplifier design. A high-energy resolutio n of 66 eV for 5.9 keV X-ray and 51 eV for pulser signals was obtained by using the optimized preamplifier with an X-ray detector of a 178 m u m x 178 mu m Nb/Al-AlO2/Nb superconducting tunnel junction with a ju nction capacitance of 1900pF and a bias current of 1.44nA.