Position monitoring of low intensity beams using a digital frequency down converter
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois (United States)
In monitoring the position of very low intensity beams a signal processing scheme similar to that used in an amplitude-comparison monopulse radar may be employed. In this scheme, an I-Q demodulator for both the sum and difference channels and a phase detector are needed to detect the beam position. It is complex and costly to implement the signal processing with discrete analog components. However, a newly available HSP50016 Digital Down Converter (DDC) chip has provided an attractive alternative. This DSP chip processes the digitized output of the IF section by first converting the signal to baseband using an in-phase/quadrature mixer and then filtering the result with a combination of a programmable high decimating filter and a fixed FIR shaping filter. The accuracy of the quadrature demodulation, nearly ideal filter shape factor and filter reject-band attenuation make the DDC a favored choice over a discrete analog design in an application dealing with very weak beam signals. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 249323
- Report Number(s):
- CONF-9410219-; ISSN 0094-243X; TRN: 96:014290
- Journal Information:
- AIP Conference Proceedings, Vol. 333, Issue 1; Conference: Beam instrumentation workshop, Vancouver (Canada), 2-6 Oct 1994; Other Information: PBD: 5 May 1995
- Country of Publication:
- United States
- Language:
- English
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