Title :
Filling pattern measurement in the LNLS storage ring
Author :
Marques, S.R. ; Onisto, H.J. ; Tavares, P.E.
Author_Institution :
LNLS, Campinas, Brazil
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;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289196
