Filling pattern measurement in the LNLS storage ring

Author

Marques, S.R. ; Onisto, H.J. ; Tavares, P.E.

Author_Institution

LNLS, Campinas, Brazil

Volume

4

fYear

2003

fDate

12-16 May 2003

Firstpage

2583

Abstract

The storage ring filling pattern affects the performance of the machine in several ways. A bunch charge meter has been developed in order to perform bunch-by-bunch charge measurement and to record the storage ring filling pattern. This instrument separates the electric pulse produced by the selected bunch from the RF signal obtained from a button pick-up. A fast switch based on a double balanced mixer (DBM) was developed to strip off all but one bunch pulse at each revolution period. A 12-bit ADC with a FIFO buffer card acquires the bunch signals. A PECL timing card performs the bunch selection. The bunch charge meter is connected to the LNLS control system through a DSP processor board, which controls the instrument through an FPGA interfacing board. The DSP software provides digital filtering. Some implementation details, performance data and operational results are presented.

Keywords

electron accelerators; high energy physics instrumentation computing; nuclear electronics; particle beam bunching; storage rings; 12-bit ADC; DBM; DSP processor board; DSP software; FIFO buffer card; FPGA interfacing board; LNLS control system; LNLS storage ring bunch charge meter; PECL timing card; RF signal; bunch selection; bunch signals; bunch-by-bunch charge measurement; button pick-up; digital filtering; double balanced mixer; electric pulse; electron storage ring; fast switch; filling pattern measurement; operational results; performance data; Charge measurement; Control systems; Digital signal processing; Filling; Instruments; Performance evaluation; Storage rings; Strips; Switches; Timing;

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.2003.1289196

Filename

1289196