An x-ray detector using PIN photodiodes for the axion helioscope
نویسنده
چکیده
An x-ray detector for a solar axion search was developed. The detector is operated at 60K in a cryostat of a superconducting magnet. Special care was paid to microphonic noise immunity and mechanical structure against thermal contraction. The detector consists of an array of PIN photodiodes and tailor made preamplifiers. The size of each PIN photodiode is 11 × 11 × 0.5 mm and 16 pieces are used for the detector. The detector consists of two parts, the front-end part being operated at a temperature of 60K and the main part in room temperature. Under these circumstances, the detector achieved 1.0 keV resolution in FWHM, 2.5 keV threshold and 6× 10 counts sec keV −1 cm background level.
منابع مشابه
Search for solar axions with mass around 1 eV using coherent conversion of axions into photons
A search for solar axions has been performed using an axion helioscope which is equipped with a 2.3-m long 4T superconducting magnet, a gas container to hold dispersion-matching gas, PIN-photodiode X-ray detectors, and a telescope mount mechanism to track the sun. A mass region around ma = 1eV was newly explored. From the absence of any evidence, analysis sets a limit on axion-photon coupling c...
متن کاملRecent Results from the Tokyo Axion Helioscope Experiment
We have searched for axions which could have been produced in the solar core using an axion helioscope which is equipped with a 2.3 m-long 4 T superconducting magnet , PIN-photodiode x-ray detectors, and a telescope mount mechanism to track the sun. A gas container to hold dispersion-matching gas has been developed and a mass region up to ma = 0.26 eV was newly explored. Preliminary analysis se...
متن کاملA liquid-helium cooled large-area silicon PIN photodiode x-ray detector
An x-ray detector using a liquid-helium cooled large-area silicon PIN photodiode has been developed along with a tailor-made charge sensitive preamplifier whose firststage JFET has been cooled. The operating temperature of the JFET has been varied separately and optimized. The xand γ-ray energy spectra for an Am source have been measured with the photodiode operated at 13 K. An energy resolutio...
متن کاملSearch for sub-electronvolt solar axions using coherent conversion of axions into photons in magnetic field and gas helium
A search for solar axions has been performed using an axion helioscope which is equipped with a 2.3m-long 4T superconducting magnet, PIN-photodiode X-ray detectors, and a telescope mount mechanism to track the sun. In addition, a gas container to hold dispersion-matching gas has been developed and a mass region up to ma = 0.27 eV was newly explored. From the absence of any evidence, analysis se...
متن کاملMeasurement of the thickness of an insensitive surface layer of a PIN photodiode
We measured the thickness of an insensitive surface layer of a PIN photodiode, Hamamatsu S3590-06, used in the Tokyo Axion Helioscope. We made alpha-particles impinge on the PIN photodiode in various incidence angles and measured the pulse height to estimate the thickness of the insensitive surface layer. This measurement showed its thickness was 0.31±0.02 μm on the assumption that the insensit...
متن کامل