Optimization of a Three-Axes Teslameter for the Calibration of the Next Generation Undulators

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Optimization of a Three-Axes Teslameter for the Calibration of the Next Generation Undulators

December 4, 2020 Physical Science 0

There are many commercial and scientific uses for the measurement of a three-axis magnetic field with high spatial resolution. One particular experimental application includes characterising in free electron lasers the field map of insertion devices. This work presents the development of a new, reduced form-factor, digital teslameter with three axes. At the Paul Scherrer Institute (PSI) for the Athos soft X-ray beamline, this instrument will be used to classify the SwissFEL insertion units. The setup would move along the full length of the undulator along with a Hall probe at the middle of the cross-sectional region of the undulator on a specially designed basis. Minimal vibration device, thereby obtaining a complete map of the magnetic field in the three-axes. For the three-axis interface to a Hall probe, the teslameter integrates analogue signal conditioning, a linear absolute encoder interface and a high resolution 24-bit analog-to-digital converter. This compares with the old instrumentation setup used, consisting only of analogue circuitry with digitization performed by proprietary hardware externally to the instrument. The new instrument also offers a very detailed map of the magnetic field in the μT range with simultaneous location encoder readings at an accuracy of ±3 μm. The innovation of the instrument is the provision of an integrated optimised solution with a very compact size and efficiency comparable to the best state-of-the-art teslameters currently on the market. Initially, a brief history on magnetic field instrumentation is given, followed by the actual creation of the novel teslameter hardware. It follows the standardised calibration method that is critical to optimising this precision instrument’s efficiency. Among other parameters, the output results obtained outline the instrument’s noise, measurement accuracy, repeatability and frequency response. These are studied in order to eventually establish an informative understanding of the magnetic properties of insertion devices that need to be modelled and characterised.

Author (s) Details

Johann Cassar
Faculty of Engineering, University of Malta, Msida, MSD 2080, Malta.

Andrew Sammut
Faculty of Engineering, University of Malta, Msida, MSD 2080, Malta.

Nicholas Sammut
Faculty of ICT, University of Malta, Msida, MSD 2080, Malta.

Marco Calvi
Photon Science Division of the Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.

Sasa Dimitrijevic
Sentronis ad, 18115 Nis, Serbia.

Zarko Mitrovic
Sentronis ad, 18115 Nis, Serbia.

Sasa Spasic
SENIS, Hertizentrum 11, 6300 Zug, Switzerland.

Dragana Popovic Renella
SENIS, Hertizentrum 11, 6300 Zug, Switzerland.

Radivoje S. Popovic
SENIS, Hertizentrum 11, 6300 Zug, Switzerland.

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