Superconducting tunnel junction array development for high-resolution energy-211 dispersive x-ray spectroscopy

摘要

Cryogenic energy-dispersive x-ray detectors are being developed because of their211u001esuperior energy resolution ((less than or equal to) 10 eV FWHM for keV x rays) 211u001ecompared to semiconductor EDS systems. So far, their range of application is 211u001elimited due to their comparably small size and low count rate. We present data on 211u001ethe development of superconducting tunnel junction (STJ) detector arrays to 211u001eaddress both of these issues. A single STJ detector has a resolution around 10 eV 211u001ebelow 1 keV and can be operated at count rates of order 10,000 counts/s. We show 211u001ethat the simultaneous operation of several STJ detectors does not diminish their 211u001eenergy resolution significantly, while increasing the detector area and the 211u001emaximum count rate by a factor given by the total number of independent channels.