Commissioning of Vacuum Furnace and First Successful Heat Treatment of SRF Bulk Nb Cavities at IPN Orsay

Fouaidy, M.; Blivet, S.; Bousson, S.; Chatelet, F.; Galet, F.; Longuevergne, David; Martret, Richard; Olry, G.; Pépin-Donat, Thierry; Rabehasy, Fetra; Renard, Ludovic; Éozénou, Fabien; Maurice, Luc; Madec, Catherine

doi:10.1109/tasc.2018.2820723

Cited by 5 publications

(1 citation statement)

References 5 publications

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“…However, when SRF resonators are subjected to N-doping, a systematic reduction of max acc E of was observed in different laboratories [11][12][13]. It should be stressed that the following Heat Treatment (HT) processes modify [15][16][17][18][19][20][21][22] niobium thermal conductivity and some of its mechanical properties: 1) High temperature annealing under vacuum at 800°C (3h00) or 650 °C (10h00) for hydrogen outgassing [15,[23][24], 2) Low temperature baking, 3) N-Doping and N-infusion. For all the aforementioned arguments, it is necessary to get reliable and high precision thermal conductivity experimental data of niobium and other materials commonly used in SRF cavities fabrication.…”

Section: Figure 1 1 Impact Of Cavity Fabrication and Preparation Proc...mentioning

confidence: 99%

Thermal conductivity of niobium and thermally sprayed copper at cryogenic temperature

Fouaidy

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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We have developed a test facility dedicated to thermal conductivity k(T) measurements at low temperature. These experimental devices allow the test of four samples simultaneously during each run. The measurements are performed using steady-state axial heat flow method with a careful control of heat leaks to the surrounding. The apparatus was successfully used for measuring k(T) (Temperature T in the range: 1.5 K - 10 K) of niobium and other materials used for the fabrication of Superconducting Radio Frequency (SRF) cavities. We have tested the following samples: 1) niobium samples from different supplier (as received or/and after various high temperature Heat Treatments (HT)), 2) thermally sprayed copper coatings. The resulting experimental data are presented and compared to the experimental results previously reported by other groups and theoretical values. As expected heat treatment have a strong impact on k(T) and in particular on the phonons peak at T∼2K. More precisely, HT @ 1200°C with Ti gettering improves the Nb Residual Resistance Ratio (RRR) by a factor of 3 and consequently k(T). Finally, the correlation between the niobium RRR and the thermal conductivity. at T=4.2 K is confirmed in good agreement with the Wiedemann-Franz law

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Section: Figure 1 1 Impact Of Cavity Fabrication and Preparation Proc...mentioning

confidence: 99%

Thermal conductivity of niobium and thermally sprayed copper at cryogenic temperature

Fouaidy

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Evolution of surface oxides and impurities in high vacuum heat treated Nb: A TEM and TOF-SIMS in-situ study, mechanism and repercussions on SRF cavity applications

Bose

Mondal

Bhalerao

et al. 2020

Applied Surface Science

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SRF programs towards High-Q/High-G cavities in IJCLab

Miyazaki,

Fouaidy,

Gandolfo

et al. 2024

EPJ Web Conf.

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IJCLab has been leading the development and deployment of low-β Superconducting Radio Frequency (SRF) cavities for proton and heavy ion accelerators. We are launching an electron accelerator project for sustainable Energy Recovery Linac (iSAS/PERLE) with state-of-the-art SRF cavities at 800MHz. Our proposal includes advanced heat treatment of such cavities to reach an excellent quality factor of 3 × 1010 at 22 MV/m. In this paper, we overview the status of this activity.

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Commissioning of Vacuum Furnace and First Successful Heat Treatment of SRF Bulk Nb Cavities at IPN Orsay

Cited by 5 publications

References 5 publications

Thermal conductivity of niobium and thermally sprayed copper at cryogenic temperature

Thermal conductivity of niobium and thermally sprayed copper at cryogenic temperature

Evolution of surface oxides and impurities in high vacuum heat treated Nb: A TEM and TOF-SIMS in-situ study, mechanism and repercussions on SRF cavity applications

SRF programs towards High-Q/High-G cavities in IJCLab

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