Characterization of the radiation tolerance of cryogenic diodes for the High Luminosity LHC inner triplet circuit
Autor: | Arjan Verweij, A.-S. Mueller, Axel Bernhard, Andrzej Siemko, Krzysztof Stachon, Reiner Denz, Emmanuele Ravaioli, F. Rodriguez Mateos, Daniel Wollmann, D. Hagedorn, G. D'Angelo, Arnaud Monteuuis, Andreas Will |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Cryostat
Nuclear and High Energy Physics Technology Large Hadron Collider Materials science Physics and Astronomy (miscellaneous) 010308 nuclear & particles physics Physics::Instrumentation and Detectors High Luminosity Large Hadron Collider Surfaces and Interfaces 01 natural sciences Accelerators and Storage Rings 0103 physical sciences Neutron Irradiation Atomic physics 010306 general physics ddc:600 Superfluid helium-4 Diode Electronic circuit |
Zdroj: | Physical review accelerators and beams, 23 (5), Article: 053502 |
ISSN: | 2469-9888 |
Popis: | Cryogenic bypass diodes are part of the baseline powering layout for the circuits of the new ${\mathrm{Nb}}_{3}\mathrm{Sn}$ based final focus magnets of the high luminosity Large Hadron Collider. They will protect the magnets against excessive transient voltages during a nonuniform quenching process. The diodes are located inside an extension to the magnet cryostat, operated in superfluid helium and exposed to ionizing radiation. Therefore, the radiation tolerance of different types of diodes has been tested at cryogenic temperatures in CERN's CHARM irradiation test facility during its 2018 run. The forward bias characteristics, the turn-on voltage and the reverse blocking voltage of each diode were measured weekly at 4.2 K and 77 K, as a function of the accumulated radiation dose. The diodes were submitted to a total dose close to 12 kGy and a 1 MeV neutron equivalent fluence of $2.2\ifmmode\times\else\texttimes\fi{}{10}^{14}\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}2}$. After the end of the irradiation program the annealing behavior of the diodes was tested by increasing the temperature slowly to 293 K. This paper describes the experimental setup, the measurement procedure and the analysis of the measurements performed during the irradiation program as well as the results of the annealing study. |
Databáze: | OpenAIRE |
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