Beam in gap measurements at the SNS front-end

Author

Aleksandrov, A. ; Assadi, S. ; Blokland, W. ; Deibele, C. ; Grice, W. ; Pogge, J.

Author_Institution

Oak Ridge Nat. Lab., TN, USA

Volume

3

fYear

2003

fDate

12-16 May 2003

Firstpage

1524

Abstract

The pulsed beam in the SNS accelerator has a fine time structure which consists of 695 ns long mini-pulses separated by 250 ns gaps in order to minimize transient beam losses in the accumulator ring which could arise during the ring extraction kicker rise time. This time structure is provided by a two stage Front End chopping system which must reduce the beam current in the gap to a level of 10^-4 of the nominal current in order to satisfy requirements on the ring extraction losses. A Beam-in-Gap measuring system based on H^- stripping using Nd-YAG laser was developed and tested during the SNS Front-End commissioning period. This paper describes the Beam-in-Gap measurement system design and measured performance.

Keywords

beam choppers; beam handling equipment; neutron sources; particle beam extraction; storage rings; 250 ns; 695 ns; Nd-YAG laser; SNS accelerator; YAG:Nd; YAl5O12:Nd; accumulator ring; beam current; beam-in-gap measurement system design; fine time structure; pulsed beam; ring extraction kicker rise time; transient beam losses; two stage front end chopping system; Choppers; Extinction ratio; Ion beams; Laser beams; Linear particle accelerator; Magnetic field measurement; Optical pulses; Particle beams; Pulse measurements; System testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1288582

Filename

1288582