# US 9,040,936 B1 · Bunch length compression method for free electron lasers to avoid parasitic compressions

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- Number: US 9,040,936 B1
- Document ID: US9040936B1
- Status: Granted
- Kind: B1
- Application number: 14/503,499
- Filed: 2014-10-01
- Published: 2015-06-11
- Granted: 2015-05-26
- Earliest claimed: 2013-12-11
- Assignees: Jefferson Science Associates, LLC; Los Alamos National Security, LLC
- Applicants: Jefferson Science Associates, LLC
- Inventors: David R. Douglas; Stephen Benson; Dinh Cong Nguyen; Christopher Tennant; Guy Wilson
- Web page: https://patentgrep.com/patent/US9040936B1

## CPC

- H01S 3/0903: {Free-electron laser}
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

## Abstract

A method of bunch length compression method for a free electron laser (FEL) that avoids parasitic compressions by 1) applying acceleration on the falling portion of the RF waveform, 2) compressing using a positive momentum compaction (R56>0), and 3) compensating for aberration by using nonlinear magnets in the compressor beam line.

## Claims

### Claim 1

A method for compressing the bunch length of a free electron laser (FEL) comprising:
a. providing an FEL including an RF waveform with a falling portion;
b. applying acceleration on the falling portion of the RF waveform;
c. compressing using a positive momentum compaction (R56>0); and
d. applying aberration compensation.

### Claim 2 (depends on 1)

The method of claim 1 wherein the aberration compensation is applied by one or more nonlinear magnets in a compressor beam line.

### Claim 3 (depends on 1)

The method of claim 1 wherein the aberration compensation is applied by one or more sextupole magnets in a compressor beam line.