Towards robust design of thin film transition edge sensors for use in the next-generation superconducting radio frequency cavities

Alexander Lunt, Zsolt Kovács, Hernán Furci, Torsten Koettig, Floriane Léaux, Giovanna Vandoni

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
39 Downloads (Pure)

Abstract

In order to increase the accelerating gradient, the next-generation of Superconducting Radio Frequency (SRF) cavities will be operated with superfluid helium cooling. This upgrade requires the development of a state-of-the-art cryogenic temperature mapping system, which can be used to identify quench initiation in new cavities, and thereby assess their suitability for installation. This paper presents a new mapping system based on an array of Transition Edge Sensors (TESs): electrical devices that exploit the superconducting transition of a thin film to identify temperature changes. The TES array is manufactured using photolithography to deposit a thin film on a 100 mm diameter glass wafer. Two different designs of Au-Sn TES have been assessed; Design 1 was composed of a 10 nm Cr adhesive layer, followed by 20 nm of Au and 100 nm of Sn, and Design 2 was identical except that the Cr layer was not applied. Design 1 showed excellent film adherence, however no superconducting transition was observed. In contrast, Design 2 showed poor film bonding but a superconducting transition. These insights are being used to design a new cryogenic temperature mapping device that combines Design 1 for robust electrical contacts and Design 2 for second sound detection.

Original languageEnglish
Pages (from-to)403-404
Number of pages2
JournalMaterials and Design
Volume122
Early online date8 Mar 2017
DOIs
Publication statusPublished - 15 May 2017

Keywords

  • Cryogenic temperature mapping
  • Large Hadron Collider
  • Scanning electron microscopy
  • Superconducting radio frequency cavities
  • Thin films
  • Transition edge sensor

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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