# US 2018/0027644 A1 · Longitudinally joined superconducting resonating cavities

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- Number: US 2018/0027644 A1
- Document ID: US20180027644A1
- Status: Published application
- Kind: A1
- Application number: 15/656,509
- Filed: 2017-07-21
- Published: 2018-01-25
- Earliest claimed: 2016-07-21
- Assignees: Fermi Research Alliance, LLC
- Applicants: Fermi Research Alliance, LLC
- Inventors: Lance Cooley
- Web page: https://patentgrep.com/patent/US20180027644A1

## CPC

- H05H 7/20: with superconductive walls
- H01P 7/06: Cavity resonators
- H01P 11/008: {Manufacturing resonators}
- 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}
- H10N 60/0296: {Processes for depositing or forming copper oxide superconductor layers}
- H10N 60/0856: {of devices comprising metal borides, e.g. MgB2}
- H10N 60/20: Permanent superconducting devices
- H10N 60/202: {comprising metal borides, e.g. MgB2}
- 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 fabricating accelerator cavities comprises forming at least two half cavities and joining the half cavities with a longitudinal seal. The half cavities can comprise at least one of aluminum, copper, tin, and copper alloys. The half cavities can be coated with a superconductor or combination of materials configured to form a superconductor coating.

## Claims

### Claim 1

A method for fabricating accelerator cavities comprising:
forming at least two pieces of an RF resonating cavity; and
joining said at least two pieces of said RF resonating cavity with a longitudinal seal thereby forming an RF resonating cavity.

### Claim 2 (depends on 1)

The method of claim 1 wherein said at least two pieces of said RF resonating cavity comprise at least one of:
aluminum;
copper;
tin; and
copper alloys.

### Claim 3 (depends on 1)

The method of claim 1 further comprising:
coating said at least two pieces of said RF resonating cavity.

### Claim 4 (depends on 3)

The method of claim 3 wherein said coating comprises a superconductor.

### Claim 5 (depends on 4)

The method of claim 4 wherein said superconductor comprises one of:
niobium;
MgB2; and
Nb3Sn.

### Claim 6 (depends on 1)

The method of claim 1 further comprising heat treating said RF resonating cavity.

### Claim 7 (depends on 6)

The method of claim 6 wherein heat treating said RF resonating cavity further comprises:
heating said RF resonating cavity to a temperature ranging from 600° C. to 1100° C.

### Claim 8 (depends on 1)

The method of claim 1 further comprising;
applying one of patterning and lithographic processes to surfaces of said RF resonating cavity to tailor an electric field configuration therein.

### Claim 9

A system comprising:
at least two pieces of an RF resonating cavity; and
a longitudinal seal joining said at least two pieces of said RF resonating cavity thereby forming an RF resonating cavity.

### Claim 10 (depends on 9)

The system of claim 9 wherein said at least two pieces of said RF resonating cavity comprise at least one of:
aluminum;
copper;
tin; and
copper alloys.

### Claim 11 (depends on 9)

The system of claim 9 further comprising:
a coating applied to said at least two pieces of said RF resonating cavity.

### Claim 12 (depends on 11)

The system of claim 11 wherein said coating comprises a superconductor.

### Claim 13 (depends on 12)

The system of claim 12 wherein said superconductor comprises one of:
niobium;
MgB2; and
Nb3Sn.

### Claim 14 (depends on 9)

The system of claim 9 further comprising:
a heat treatment cycle applied to said RF resonating cavity.

### Claim 15 (depends on 14)

The system of claim 14 wherein heat treatment cycle further comprises:
heating said RF resonating cavity to a temperature ranging from 600° C. to 1100° C.

### Claim 16 (depends on 9)

The system of claim 9 further comprising:
a pattern formed in at least one surface of said RF resonating cavity applied via one of patterning and lithographic processes configured tailor an electric field configuration therein.

### Claim 17

A method for fabricating accelerator cavities comprising:
forming at least two pieces of an RF resonating cavity;
applying a superconducting coating to at least one surface of said at least two pieces of said RF resonating cavity; and
joining said at least two pieces of said RF resonating cavity with a longitudinal seal thereby forming an RF resonating cavity.

### Claim 18 (depends on 17)

The method of claim 17 wherein said at least two pieces of said RF resonating cavity comprise at least one of:
aluminum;
copper;
tin; and
copper alloys.

### Claim 19 (depends on 17)

The method of claim 17 wherein said superconductor comprises one of:
niobium;
MgB2; and
Nb3Sn.

### Claim 20 (depends on 17)

The method of claim 17 further comprising:
heat treating said RF resonating cavity, wherein heat treating said RF resonating cavity further comprises heating said RF resonating cavity to a temperature ranging from 600° C. to 1100° C.