The theory of the measurement of magnetic multipole fields with rotating coil magnetometers

Davies, W.G.

doi:10.1016/0168-9002(92)90637-j

Cited by 41 publications

(26 citation statements)

References 4 publications

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“…Multipole measurement with harmonic coils is well known since Davies' theory [1]. However the difficulty is to take into account all sources of mistakes.…”

Section: Theorymentioning

confidence: 99%

“…Any erroneous movement of the sensor can affect the real harmonic content of the measured magnet as sag of the sensor stand. The sag effect is represented by an additional spurious skew sextupolar component [1] and must be discriminated with a specific method. Scanning the device along the s-axis and noting the z position of the magnetic axis can confirm or not sag phenomenon and also girder machining quality.…”

Section: Experimental Testsmentioning

confidence: 99%

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Tools for Multipoles Magnetic Metrology at SOLEIL

Madur

Marteau

Benabderrahmane

et al. 2006

2006 IEEE Instrumentation and Measurement Technology Conference Proceedings

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SOLEIL Synchrotron is a set of 3 electron accelerators (LINAC, Booster and Storage Ring). The 354 m circumference storage ring is dedicated to synchrotron radiation for fundamental and applied physics research. The most sensitive components of the Storage Ring are quadrupoles therefore manufacturing requirements are very strict. To check magnetic properties of the magnets (harmonics, magnetic axis position, magnetic tilt angle), it was necessary to measure entities at a lower level than the specifications required by the beam dynamics. Moreover measurements were to be durable during approximately six months as there were 160 quadrupoles to characterize and few tens of sextupoles to check. In this paper, we describe how was thought and optimized the SOLEIL bench and the way taken to avoid effects of manufacturing errors of the bench.

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“…Multipole measurement with harmonic coils is well known since Davies' theory [1]. However the difficulty is to take into account all sources of mistakes.…”

Section: Theorymentioning

confidence: 99%

Section: Experimental Testsmentioning

confidence: 99%

Tools for Multipoles Magnetic Metrology at SOLEIL

Madur

Marteau

Benabderrahmane

et al. 2006

2006 IEEE Instrumentation and Measurement Technology Conference Proceedings

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“…The multipole coefficients in (7) can be written explicitly as a sum of their real and imaginary parts: C c (9) The classical methods to measure multipoles utilize mainly rotating coils [7]. C n are computed by relating the FFT coefficients to the flux seen by the coil as a function of the rotational angle [8].…”

Section: B Theory Of the Multipole Coefficients Measurementmentioning

confidence: 99%

Magnetic field measurements on small magnets by vibrating wire systems

Arpaïa

Buzio

Perez

et al. 2011

2011 IEEE International Instrumentation and Measurement Technology Conference

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A new method based on vibrating wire to measure field multipole is presented. The magnet multipoles are assessed by positioning the wire in different points on a circle inside the magnet aperture and measuring the amplitude of wire vibrations. An analytical model relates vibration amplitudes to multipoles. Results of simulation tests aimed at analyzing the model performance are reported. Preliminary experimental validation results on small permanent magnets for the new linear accelerator Linac4 at European Organization for Nuclear Research (CERN) are shown.

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“…To perform the magnetic measurements on the SLS multipoles BINP designed and built the Rotating Coil System (RCS) and a special multipole measuring bench [4]. The position of the magnetic axis, the roll angle relatively to RCS reference surfaces and the harmonic coefficients were measured with high accuracy.…”

Section: The Measuring Systemmentioning

confidence: 99%