Journal Article

PUBDB-2024-06669

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermal transmittance measurements of niobium at cryogenic temperatures

Wenskat, M. (Corresponding author)DESY* ; King, L. A.Extern* ; Saribal, C.Extern* ; Lorf, A.Extern* ; Gonzalez Diaz-Palacio, I.Extern* ; Martens, C.Extern*DESY* ; Zierold, R.Extern* ; Hillert, W.CFEL*Extern* ; Koch, L.Extern*

2025
North-Holland Physics Publ. Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.physc.2025.1354694  doi:10.3204/PUBDB-2024-06669

Abstract: The first $\mathcal{O}$(100s\,nm) of the inner surface Niobium-based superconducting RF (SRF) cavities are crucial to achieve high accelerating fields and a low surface resistance. Recent treatments aim to improve superconducting properties by tailoring the interstitial atom concentration or by depositing thin superconducting films. Yet, no investigation of the thermal characteristics of those surfaces after such treatments has been done, although this is a crucial property to cool the induced RF losses away and to maintain the superconducting state while high surface magnetic fields are applied. In this contribution, a newly developed experimental set up is described, which allowed the first ever measurement of the thermal transmittance of Mid-T heat treated and Superconductor-Insulator-Superconductor (SIS) coated Niobium samples. The results show that SIS samples perform the same as standard Niobium and that Mid-T heat treated samples have an improved thermal transmittance of 30\%.

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Contributing Institute(s):

1. Supraleitende Beschleuniger Technologie (MSL)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. 05H21GURB2 - Verbundprojekt 05H2021 - R&D BESCHLEUNIGER (TOSCA): Neue Ansätze zur Messung und Modellierung der Oberflächeneigenschaften supraleitender Resonatoren (BMBF-05H21GURB2) (BMBF-05H21GURB2)
3. 05K22GUD - Verbundprojekt 05K2022 - NOVALIS: Innovative Beschleunigertechnologien für effiziente Strahlungsquellen. Teilprojekt 1. (BMBF-05K22GUD) (BMBF-05K22GUD)

Experiment(s):

1. Superconductivity Radio Frequency Research and Development

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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