Performance of a fast digital integrator in on-field magnetic measurements for particle accelerators

The fast digital integrator has been conceived to face most demanding magnet test requirements with a resolution of 10 ppm, a signal-to-noise ratio of 105 dB at 20 kHz, a time resolution of 50ns, an offset of 10 ppm, and on-line processing. In this paper, the on-field achievements of the fast digita...

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Bibliographic Details
Published in:Review of scientific instruments 2012-02, Vol.83 (2), p.024702-024702-7
Main Authors: Arpaia, P., Bottura, L., Fiscarelli, L., Walckiers, L.
Format: Article
Language:English
Subjects:
ACCELERATORS
Architecture
CERN
DATA PROCESSING
Digital integrators
DIGITAL SYSTEMS
Drift
ELECTRIC CURRENTS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
KHZ RANGE
MAGNETIC FIELDS
Noise levels
PARTICLE ACCELERATORS
PERMANENT MAGNETS
PULSE INTEGRATORS
Quality assessment
SIGNAL-TO-NOISE RATIO
SUPERCONDUCTING MAGNETS
TIME RESOLUTION
Uncertainty
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Summary:The fast digital integrator has been conceived to face most demanding magnet test requirements with a resolution of 10 ppm, a signal-to-noise ratio of 105 dB at 20 kHz, a time resolution of 50ns, an offset of 10 ppm, and on-line processing. In this paper, the on-field achievements of the fast digital integrator are assessed by a specific measurement campaign at the European Organization for Nuclear Research (CERN). At first, the architecture and the metrological specifications of the instrument are reported. Then, the recent on-field achievements of (i) ±10 ppm of uncertainty in the measurement of the main field for superconducting magnets characterization, (ii) ±0.02 % of field uncertainty in quality assessment of small-aperture permanent magnets, and (iii) ±0.15 % of drift, in an excitation current measurement of 600 s under cryogenic conditions, are presented and discussed.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3673000