Beam profile wire-scanner/halo-scraper sensor analog interface electronics

Author

Gruchalla, M.E. ; Hara, J.O. ; Barr, D. ; Cote, T. ; Day, L. ; Gilpatrick, D. ; Stettler, M. ; Martinez, D.

Author_Institution

Honeywell FM&T/NM, Albuquerque, NM, USA

Volume

3

fYear

2001

fDate

2001

Firstpage

2314

Abstract

The halo experiment presently being conducted at the Low Energy Demonstration Accelerator (LEDA) at Los Alamos National Laboratory utilizes a generally traditional wire scanner for measurement of the beam core profile and a graphite scraper for measurement of the tails of the beam distribution. A lossy integrator is used to detect the replacement charge flowing to the wire and scraper. Independent programmable dc-bias voltages are applied to the wire and the scraper through the analog electronic interface to optimize the charge capture from the two sensors. A programmable guard voltage is applied to isolate the scraper from the resistivity of the cooling system. A programmable gain provides a total dynamic range in the analog electronics of greater than about one part in 10⁶. The analog signal is digitized to 14 bits plus sign, and the equivalent input noise is nominally 30 fC

Keywords

analogue circuits; beam handling equipment; circuit noise; cooling; graphite; high energy physics instrumentation computing; integrating circuits; nuclear electronics; particle beam diagnostics; programmable circuits; proton accelerators; proton beams; C; LEDA; Los Alamos National Laboratory; Low Energy Demonstration Accelerator; analog electronic interface; analog interface electronics; analog signal; beam core profile; beam distribution tails; beam profiles; charge capture optimisation; cooling system; graphite scraper; halo-scraper sensor; input noise; lossy integrator; programmable dc-bias voltages; programmable gain; programmable guard voltage; replacement charge flow; total dynamic range; wire scanner sensor; Atomic measurements; Electrons; Energy measurement; Laboratories; Particle beams; Probability distribution; Radio frequency; Surges; Voltage; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.987363

Filename

987363