Speaker
Mr
Alessandro Masi
(CERN)
Description
Rotating coils is the method preferred in the measurement of field and field
quality for accelerator magnets. One of the fundamental points of this instrument
is represented by the digital integrators. These perform the integration of the
pickup coils voltage in the angular domain, i.e according the triggers provided by
an angular encoder. The resolution of the integration process can become a critical
issue when the coils speed increases or in varying magnetic field measurements with
high ramp rate.
In this talk we descrive the design principles of a new generation of numerical
integrators based on the use of a DSP (Digital Signal Processing). The central idea
is to perform a real time numerical integration on the samples of the coils
voltage, acquired at high sampling frequency and good resolution (A/D conversion).
With a selection of the best electronic components available nowadays we expect a
resolution on the integrated voltage with a maximum increase of 5 orders of
magnitude as compared to digital integrators previously developed at CERN. An
experimental proof demonstrator of a new numerical integrator based on 18 bit
Analog to Digital converter was realized using a PXI data acquisition system.
Results of an accurate metrological characterization of this prototype as well as a
comparison with the old PDI integrator performances are discussed.
Author
Mr
Alessandro Masi
(CERN)
Co-authors
Mr
David Giloteaux
(CERN)
Prof.
Juan Garcia-Perez
(CERN)
Dr
Luca Bottura
(CERN)
Prof.
Pasquale Arpaia
(Università del Sannio)
Mr
Romain Thibault de Chanvalon
(CERN)
