Electron beam control for barely separated beams

Patent metadata

Field	Value
Publication number	US-9629231-B1
Application number	US-201615051782-A
Country	US
Kind code	B1
Filing date	Feb 24, 2016
Priority date	Feb 24, 2016
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A method for achieving independent control of multiple beams in close proximity to one another, such as in a multi-pass accelerator where coaxial beams are at different energies, but moving on a common axis, and need to be split into spatially separated beams for efficient recirculation transport. The method for independent control includes placing a magnet arrangement in the path of the barely separated beams with the magnet arrangement including at least two multipole magnets spaced closely together and having a multipole distribution including at least one odd multipole and one even multipole. The magnetic fields are then tuned to cancel out for a first of the barely separated beams to allow independent control of the second beam with common magnets. The magnetic fields may be tuned to cancel out either the dipole component or tuned to cancel out the quadrupole component in order to independently control the separate beams.

First claim

What is claimed is:

1. A method of independently controlling multiple, barely separated beams in a common transport pipe, comprising:
providing a magnet arrangement including at least two multipole magnets spaced closely together and having a multipole distribution including at least one odd multipole and one even multipole;
placing the closely spaced multipole magnets in the path of the barely separated beams; and
tuning the magnetic fields to cancel out a first of the barely separated beams to enable independent control of the second beam with common magnets.

2. The method of claim 1 further comprising tuning the magnetic fields to cancel out the dipole component.

3. The method of claim 1 further comprising tuning the magnetic fields to cancel out the quadrupole component.

Assignees

• Jefferson Science Ass Llc
• Asml Netherlands Bv

Inventors

• Douglas David R
• Ament Lucas J P

Classifications

• H05H7/04

  Magnet systems {, e.g. undulators, wigglers (free-electron laser H01S3/0903)}; Energisation thereof · CPC title

• H05H7/06 Primary

  Two-beam arrangements; Multi-beam arrangements {storage rings}; Electron rings · CPC title

• H05H9/00

  Linear accelerators · CPC title

• H05H9/005

  Dielectric wall accelerators · CPC title

• H05H2007/025

  Radiofrequency systems · CPC title