Contribution to a conference proceedings/Contribution to a book

PUBDB-2023-04897

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Impact of Medium Temperature Heat Treatments on the Magnetic Flux Expulsion Behavior of SRF Cavities

Wolff, J. (Corresponding author)DESY* ; Eschke, J.DESY* ; Goessel, A.DESY* ; Kasprzak, K.CSSB*DESY* ; Reschke, D.DESY* ; Steder, L.DESY* ; Trelle, L.DESY* ; Wiencek, M.DESY* ; Hillert, W.CFEL*Extern*

2023
JACoW Publishing Geneva, Switzerland
ISBN: 978-3-95450-234-9

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Please use a persistent id in citations: doi:10.18429/JACoW-SRF2023-WEPWB065  doi:10.3204/PUBDB-2023-04897

Abstract: Medium temperature (mid-T) heat treatments at about 300 °C are used to enhance the intrinsic quality factor of superconducting radio frequency (SRF) cavities. Unfortunately, such treatments potentially increase the sensitivity to trapped magnetic flux and consequently the surface resistance of the cavity. For this reason, it is crucial to maximizethe expulsion of magnetic flux during the cool down. The flux expulsion behavior is next to the heat treatment mainly determined by the geometry, the niobium grain size and thegrain orientation. However, it is also affected by parameters of the cavity performance tests like the cool down velocity, the spatial temperature gradient along the cavity surface andthe magnetic flux density during the transition of the critical temperature. To improve the flux expulsion behavior and hence the efficiency of future accelerator facilities, the impact of these adjustable parameters as well as the mid-T heat treatment on 1.3 GHz TESLA-Type single-cell cavities is investigated by a new approach of a magnetometric mapping system. In this contribution first performance test results of cavities before and after mid-T heat treatment are presented

Keyword(s): Accelerator Physics ; SRF Technology

Note: Literaturangaben;

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Contributing Institute(s):

1. Supraleitende Beschleuniger Technologie (MSL)
2. Kryogenik (MKS1)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)

Experiment(s):

1. Superconductivity Radio Frequency Research and Development

Appears in the scientific report 2023

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