# US 12,004,286 B2 · Methods and systems for treatment of superconducting materials to improve low field performance

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- Number: US 12,004,286 B2
- Document ID: US12004286B2
- Status: Granted
- Kind: B2
- Application number: 17/898,065
- Filed: 2022-08-29
- Published: 2023-05-25
- Granted: 2024-06-04
- Earliest claimed: 2018-10-06
- Assignees: Fermi Research Alliance, LLC
- Applicants: Fermi Research Alliance, LLC
- Inventors: Alexander Romanenko; Sam Posen; Anna Grassellino
- Web page: https://patentgrep.com/patent/US12004286B2

## CPC

- H05H 7/20: with superconductive walls
- H01P 7/06: Cavity resonators
- H01P 11/008: {Manufacturing resonators}
- H10N 60/01: Manufacture or treatment
- H10N 60/0156: {of devices comprising Nb or an alloy of Nb with one or more of the elements of group IVB, e.g. titanium, zirconium or hafnium}
- H05H: PLASMA TECHNIQUE (apparatus or processes specially adapted for producing X-rays H05G2/00); PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

A system and method for treating a cavity comprises preparing a superconducting radio frequency (SRF) cavity for removal of a dielectric layer from on an inner surface of the SRF cavity, subjecting the SRF cavity to a heat treatment in order to remove the dielectric layer from the inner surface of the SRF cavity, and preventing the development of a new dielectric layer on the inner surface of the SRF cavity by preventing an interaction between the inner surface of the SRF cavity and atmospheric gasses.

## Claims

### Claim 1

A system for treating a cavity comprising:
a superconducting radio frequency (SRF) cavity with an inner volume defined by an inner surface;
a vacuum pulling system coupled to the SRF cavity with a vacuum line, and configured to draw a vacuum in the inner volume of the SRF cavity;
a vacuum connection configured to connect the SRF cavity to the vacuum pulling system;
a gasket formed between the SRF cavity and the vacuum connection;
a liquid cooled collar configured to cool the gasket formed between the SRF cavity and the vacuum connection;
a heating element formed on an exterior of the SRF cavity;
a support frame comprising vertical members and crossbeams, configured to withstand temperatures to which the SRF cavity is subjected during the heat treatment; and
an oven configured to expose the SRF cavity to a heat treatment wherein the heat treatment removes a dielectric layer from the inner surface of the SRF cavity.

### Claim 2 (depends on 1)

The system for treating a cavity of claim 1 wherein the SRF cavity comprises niobium.

### Claim 3 (depends on 1)

The system for treating a cavity of claim 1 further comprising:
at least one thermocouple attached to the SRF cavity proximate to the heat element, configured to measure a temperature of the SRF cavity during the heat treatment.