CERN Accelerating science

Published Articles
Report number	CERN-ACC-2019-265
Title	Characterisation of the radiation hardness of cryogenic bypass diodes for the HL-LHC inner triplet quadrupole circuit
Author(s)	Wollmann, Daniel (CERN) ; Bernhard, Axel (KIT, Karlsruhe) ; Cangialosi, Chiara (CERN) ; Cerutti, Francesco (CERN) ; D'Angelo, Giorgio (CERN) ; Danzeca, Salvatore (CERN) ; Denz, Reiner (CERN) ; Favre, Mathieu (CERN) ; Garcia Alia, Ruben (CERN) ; Hagedorn, Dietrich (CERN) ; Infantino, Angelo (CERN) ; Kirby, Glyn (CERN) ; Vammen Kistrup, Lucas (CERN) ; Koettig, Torsten (CERN) ; Lendaro, Jerome (CERN) ; Lindstrom, Bjorn (CERN) ; Monteuuis, Arnaud (CERN) ; Müller, Anke-Susanne (KIT, Karlsruhe) ; Rodriguez-Mateos, Felix (CERN) ; Siemko, Andrzej (CERN) ; Stachon, Krzysztof (CERN) ; Tsinganis, Andrea (CERN) ; Valette, Matthieu (CERN) ; Verweij, Arjan (CERN) ; Will, Andreas (CERN ; KIT, Karlsruhe)
Publication	2019
Number of pages	4
In:	10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPTS067
DOI	10.18429/JACoW-IPAC2019-THPTS067
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN CHARM
Abstract	The powering layout of the new HL-LHC Nb$_3$Sn triplet circuits is the use of cryogenic bypass diodes, where the diodes are located inside an extension to the magnet cryostat, operated in superfluid helium and exposed to radiation. Therefore, the radiation hardness of different type of bypass diodes has been tested at low temperatures in CERN’s CHARM irradiation facility during the operational year 2018. The forward characteristics, the turn on voltage and the reverse blocking voltage of each diode were measured weekly at 4.2 K and 77 K, respectively, as a function of the accumulated radiation dose. The diodes were submitted to a dose close to 12 kGy and a 1 MeV equivalent neutron fluence of $2.2 \times 10^{14}$ n/cm$^2$. After the end of the irradiation campaign the annealing behaviour of the diodes was tested by increasing the temperature slowly to 300 K. This paper describes the experimental setup, the measurement procedure and discusses the results of the measurements.
Copyright/License	Publication: (License: CC-BY-3.0)

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