IPAC2017 - List of Authors (Fiscarelli, L.)

Paper	Title	Page
THPIK027	Dynamic Behaviour of Fast-Pulsed Quadrupole Magnets for LINAC4 Transfer Line	4150
	S. Kasaei IPM, Tehran, Iran M.C.L. Buzio, L. Fiscarelli CERN, Geneva, Switzerland
	Linac4, recently built at CERN, is a linear normal conducting accelerator for negative hydrogen ions (H⁻). A new transfer line will link Linac4 to the Proton Synchrotron Booster. This transfer line includes 21 quadrupole magnets characterized by fast excitation cycles, which make accurate magnetic measurements challenging. This paper describes the method used for the measurement, which is a combination of techniques based on rotating and fixed search coils. We show how these instruments can be used in a complementary way to derive information on different aspects of the magnetic behaviour of these quadrupoles, such as the impact of hysteresis and dynamic eddy current effects.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK027
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THPIK092	Considerations on the Effect of Magnet Yoke Dilution on Remanent Field at ELENA	4299
	C. Carli, L. Fiscarelli, D. Schoerling CERN, Geneva, Switzerland
	The Extra Low Energy Antiproton ring (ELENA) is a small synchrotron constructed at CERN to decelerate antiprotons down to 100 keV and, thus, operated at very low magnetic fields. The CERN magnet group has carried out extensive investigations on accelerator magnets for very low fields, comprising theoretical studies and the construction of several prototype magnets, to ensure that the required field quality can be reached at these very low fields. In the course of this work, experimental investigations [1] led to the initially unexpected observation that dilution of the yoke, i.e. alternating laminations made of electric steel with thicker non-magnetic stainless steel laminations, increases the remnant field. An explanation for this behaviour has already been anticipated in a previous paper [2]. Here, we treat this specific topic in analytical detail. We come to the conclusion that magnet yoke thinning in most practical situations does not improve the field quality at very low field levels, but rather enhances the impact from hysteresis and remanence effects. [1] L.Fiscarelli, Magnetic measurements on the quadrupoles prototypes for ELENA (PXMQNLGNAP), CERN internal report. [2] D. Schoerling, Case Study of a Magnetic System for low-Energy Machines, PRAB 19, 082401 (2016).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK092
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Dynamic Behaviour of Fast-Pulsed Quadrupole Magnets for LINAC4 Transfer Line

4150

S. Kasaei
IPM, Tehran, Iran
M.C.L. Buzio, L. Fiscarelli
CERN, Geneva, Switzerland

Linac4, recently built at CERN, is a linear normal conducting accelerator for negative hydrogen ions (H⁻). A new transfer line will link Linac4 to the Proton Synchrotron Booster. This transfer line includes 21 quadrupole magnets characterized by fast excitation cycles, which make accurate magnetic measurements challenging. This paper describes the method used for the measurement, which is a combination of techniques based on rotating and fixed search coils. We show how these instruments can be used in a complementary way to derive information on different aspects of the magnetic behaviour of these quadrupoles, such as the impact of hysteresis and dynamic eddy current effects.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK027

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPIK092

Considerations on the Effect of Magnet Yoke Dilution on Remanent Field at ELENA

4299

C. Carli, L. Fiscarelli, D. Schoerling
CERN, Geneva, Switzerland

The Extra Low Energy Antiproton ring (ELENA) is a small synchrotron constructed at CERN to decelerate antiprotons down to 100 keV and, thus, operated at very low magnetic fields. The CERN magnet group has carried out extensive investigations on accelerator magnets for very low fields, comprising theoretical studies and the construction of several prototype magnets, to ensure that the required field quality can be reached at these very low fields. In the course of this work, experimental investigations [1] led to the initially unexpected observation that dilution of the yoke, i.e. alternating laminations made of electric steel with thicker non-magnetic stainless steel laminations, increases the remnant field. An explanation for this behaviour has already been anticipated in a previous paper [2]. Here, we treat this specific topic in analytical detail. We come to the conclusion that magnet yoke thinning in most practical situations does not improve the field quality at very low field levels, but rather enhances the impact from hysteresis and remanence effects.
[1] L.Fiscarelli, Magnetic measurements on the quadrupoles prototypes for ELENA (PXMQNLGNAP), CERN internal report.
[2] D. Schoerling, Case Study of a Magnetic System for low-Energy Machines, PRAB 19, 082401 (2016).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK092

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)