Speaker
Description
Unlike their low temperature counterparts, high temperature superconductors (HTS) can retain excellent RF perfomance in the demanding conditions of some emerging high-energy physics technologies, which require high quality factors at frequencies in the GHz range under strong magnetic fields (16-20 T). In particular, we have demonstrated that REBa2Cu3O7-x (RE = Y, Gd, Eu) (REBCO) offers outstanding, better than-Cu RF response in such conditions [1,2]. If in addition, HTS materials would sustain very high accelerating gradients (100-150 MV/m) keeping low RF properties, they could represent a promising solution accelerating cavities like those of the cooling stage of the muon collider. Unfortunately, up to now the usage of REBCO in RF applications is hindered by its complicated material growth, which makes it virtually impossible for it to be grown directly on the geometrically complex surfaces required for many applications.
To achieve a low surface impedance REBCO coating in RF cavities, we have developed a coating methodology based on soldering and delaminating coated conductors (CC). Up to now, our coating methodology was employed for the fabrication of axion dark matter detection haloscopes [3,4], a superconductor pulse compressor and prototypes for the Future Circular Collider (FCC-hh) beam screen [5]. Our findings place REBCO CC-based coatings as a solid candidate to replace Cu as the low surface-impedance coating in many high-energy physics applications.
In this work, we have investigated the RF response of REBCO coatings up to 10 MV/cm at cryogenic temperatures and zero magnetic field and we are proceeding towards 100 MV/m experiments and later to superimpose a high magnetic field. All these experiments should generate data regarding the opportunities of HTS CC to replace Cu also in some cooling cavities of the Muon Collider feasibility study.
We acknwoledge the iFAST project, the RADES collaboration and the FCC feasibility study.
References:
[1] T. Puig et al 2019 Supercond. Sci. Technol. 32 094006, doi: 10.1088/1361-6668/ab2e66.
[2] A. Romanov et al. Sci Rep 10, 12325 (2020), doi: 10.1038/s41598-020-69004-z.
[3] J. Golm et al, IEEE TAS, vol. 32, no. 4, pp. 1-5, Art no. 1500605, doi: 10.1109/TASC.2022.3147741.
[4] S. Ahyoune et al, 2024. https://arxiv.org/abs/2403.07790
[5] G. T. Telles et al, 2023 Supercond. Sci. Technol. 36 045001, doi: 10.1088/1361-6668/ac97c9.
| What category does your poster fit in? | Muon Cooling |
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