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Characterization of the radiation tolerance of cryogenic diodes for the High Luminosity LHC inner triplet circuit

Will, Andreas 1; D’Angelo, G.; Denz, R.; Hagedorn, D.; Monteuuis, A.; Ravaioli, E.; Rodriguez Mateos, F.; Siemko, A.; Stachon, K.; Verweij, A.; Wollmann, D.; Mueller, A.-S. ORCID iD icon 1; Bernhard, A. ORCID iD icon 1
1 Karlsruher Institut für Technologie (KIT)


Cryogenic bypass diodes are part of the baseline powering layout for the circuits of the new Nb3Sn 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 2.2×1014  cm−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.

Verlagsausgabe §
DOI: 10.5445/IR/1000120399
Veröffentlicht am 23.06.2020
DOI: 10.1103/PhysRevAccelBeams.23.053502
Zitationen: 2
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Beschleunigerphysik und Technologie (IBPT)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2469-9888
KITopen-ID: 1000120399
HGF-Programm 54.01.01 (POF III, LK 01) ps- und fs-Strahlen
Erschienen in Physical review accelerators and beams
Verlag American Physical Society (APS)
Band 23
Heft 5
Seiten Article: 053502
Vorab online veröffentlicht am 27.05.2020
Nachgewiesen in Dimensions
Web of Science
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