scholarly journals Test of horizontal field measurements using two-axis Hall probes at the APS Magnetic Measurement Facility

1998 ◽  
Author(s):  
I. Vasserman
Keyword(s):  
Magnetic Measurement ◽  
Field Measurements ◽  
Measurement Facility ◽  
Hall Probes ◽  
Horizontal Field

Automatic Magnetic Measurement Facility for Synchrotron Magnets

1970 ◽  
Author(s):  
H. Feng ◽  
E. Malamud ◽  
J. Schivell ◽  
C. Schmidt ◽  
R. Yamada
Keyword(s):  
Magnetic Measurement ◽  
Measurement Facility

scholarly journals A magnetometer for the measurement of the Earth's vertical magnetic intensity in C. G. S. measure

1928 ◽  
Vol 117 (777) ◽  
pp. 434-458 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Vertical Component ◽  
Field Measurements ◽  
Horizontal Component ◽  
Magnetic Intensity ◽  
Earth’S Magnetic Field ◽  
Simple Operation ◽  
Horizontal Field ◽  
Earth's Magnetic Field

The measurement of the vertical component of the earth’s magnetic field is a less simple operation than that of the horizontal component. The horizontal field measurements are on a satisfactory basis, whether made by the swinging magnet method, or by the more recently developed electric magnetometers, in which known magnetic fields may be provided by means of known currents flowing through coils of known dimensions.

Rotating- and translating-coil magnetometers for extracting pseudo-multipoles in accelerator magnets

2017 ◽  
Vol 36 (5) ◽  
pp. 1552-1567 ◽  
Author(s):  
Stephan Russenschuck
Keyword(s):  
Magnetic Measurement ◽  
Scaling Law ◽  
Field Measurements ◽  
Expansion Method ◽  
Induction Coil ◽  
Orthogonal Expansion ◽  
Content Type ◽  
Leading Term ◽  
Accelerator Magnets ◽  
Longitudinal Position

Purpose The purpose of this paper is to establish the mathematical foundations of magnetic measurement methods based on translating-coil and rotating-coil magnetometers for accelerator magnets and solenoids. These field transducers allow a longitudinal scanning of the field distribution, but require a sophisticated post-processing step to extract the coefficients of the Fourier–Bessel series (known as pseudo-multipoles or generalized gradients) as well as a novel design of the rotating coil magnetometers. Design/methodology/approach Calculating the transversal field harmonics as a function of the longitudinal position in the magnet, or measuring these harmonics with a very short, rotating induction-coil scanner, allows the extraction of the coefficients of a Fourier–Bessel series, which can then be used in the thin lens approximation of the end regions of accelerator magnets. Findings The extraction of the leading term in the Fourier–Bessel series requires the solution of a differential equation by means of a Fourier transform. This yields a natural way to de-convolute the measured distribution of the multipole content. The author has shown that the measurement technique requires iso-parametric coils to avoid interception of the longitudinal field component. The compensation of the main signal cannot be done with the classical arrangement of search coils at different radii, because no easy scaling law exists. A new design of an iso-perimetric induction coil has been found. Research limitations/implications In the literature, it is stated that the pseudo-multipoles can be extracted from field computations or measurements. While this is true for computations, the author shows that the measurement of the field harmonics must be done with iso-parametric coils because otherwise the leading term in the Fourier–Bessel series cannot be extracted. Practical implications The author has now established the theory behind a number of field transducers, such as the moving fluxmeter, the rotational coil scanner and the solenoidal field transducer. Originality/value This paper brought together the known theory of the orthogonal expansion method with the methods and tools for magnetic field measurements to establish a field description in accelerator magnets.

scholarly journals The insertion device magnetic measurement facility: Prototype and operational procedures

1993 ◽  
Author(s):  
L. Burkel ◽  
R. Dejus ◽  
J. Maines ◽  
J. O`Brien ◽  
I. Vasserman ◽  
...  
Keyword(s):  
Magnetic Measurement ◽  
Measurement Facility ◽  
Insertion Device

scholarly journals The insertion device magnetic measurement facility: Prototype and operational procedures

1993 ◽  
Author(s):  
L Burkel ◽  
R Dejus ◽  
J Maines ◽  
J O'Brien ◽  
I Vasserman ◽  
...  
Keyword(s):  
Magnetic Measurement ◽  
Measurement Facility ◽  
Insertion Device

Construction of a vertical undulator at SPring-8

1998 ◽  
Vol 5 (3) ◽  
pp. 414-416 ◽  
Author(s):  
Takashi Tanaka ◽  
Xavier-Marie Maréchal ◽  
Toru Hara ◽  
Toshiya Tanabe ◽  
Hideo Kitamura
Keyword(s):  
Magnetic Field ◽  
Structural Biology ◽  
Field Measurements ◽  
Magnetic Performance ◽  
Insertion Device ◽  
Horizontal Field ◽  
Magnetic Field Measurements ◽  
New Type ◽  
The Individual ◽  
Polarized Radiation

A new-type insertion device (ID) has been constructed for the structural-biology beamline (BL45XU) at SPring-8. The ID consists of two undulators which can provide vertical polarized radiation (vertical undulators). By changing the individual gap of each undulator independently, photons with two different energies can be obtained. Magnetic field measurements show that the maximum horizontal field is 0.49 T and the magnetic performance is as good as expected.

scholarly journals CASPER- A magnetic measurement facility for superconducting undulators

2008 ◽  
Vol 97 ◽  
pp. 012020 ◽  
Author(s):  
E Mashkina ◽  
A Grau ◽  
Th Schneider ◽  
A Bernhard ◽  
S Casalbuoni ◽  
...  
Keyword(s):  
Magnetic Measurement ◽  
Measurement Facility

Effects of contact gap on nondestructive evaluation using magnetic measurement for ferromagnetic steel

2020 ◽  
Vol 64 (1-4) ◽  
pp. 969-975
Author(s):  
Hiroaki Kikuchi ◽  
Yuki Sato
Keyword(s):  
Magnetic Flux ◽  
Nondestructive Evaluation ◽  
Effective Permeability ◽  
Magnetic Circuit ◽  
Magnetic Measurement ◽  
Air Gap ◽  
Motive Force ◽  
Hysteresis Curve ◽  
Evaluation Technique ◽  
Ferromagnetic Steel

We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen and gap, which results in the reduction of flux applying to specimen.

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