IPAC2013 - List of Authors (Thomsen, H.D.)

Paper	Title	Page
MOPEA005	A Linear Beam Raster System for the European Spallation Source?	70
	H.D. Thomsen, A.I.S. Holm, S.P. Møller ISA, Aarhus, Denmark
	The European Spallation Source (ESS) will, when built, be the most intense neutron source in the world. The neutrons are generated by a high power (5 MW) proton beam impacting a rotating W spallation target. To reduce the replacement frequency of components subjected to the full beam current, i.e. the proton beam window and the target, means to introduce low peak current densities, i.e. flat transverse beam profiles, are necessary. The relatively long beam pulse duration of 2.86 ms (at 14 Hz) leaves ample time to facilitate a Lissajous-like, linear raster system that illuminates a footprint area by sweeping an only moderately enlarged LINAC beamlet. Although slightly more technically challenging, this method has many advantages over the previously envisaged beam expander system based on non-linear DC magnets. The design, specifications, performance, and benefits of the beam raster system will be described and discussed.

THPME001	Permanent Magnets in Accelerators can save Energy, Space, and Cost	3511
	F. Bødker, L.O. Baandrup, A. Baurichter, N. Hauge, K.F. Laurberg, B.R. Nielsen, G. Nielsen Danfysik A/S, Taastrup, Denmark O. Balling Aarhus University, Aarhus, Denmark F.B. Bendixen, P. Kjeldsteen, P. Valler Sintex A/S, Hobro, Denmark S.P. Møller, H.D. Thomsen ISA, Aarhus, Denmark H.-A. Synal ETH, Zurich, Switzerland
	Green Magnet technology with close to zero electrical power consumption without the need for cooling water saves costs, space and hence spares natural resources. A compact dipole based on permanent magnets has been developed at Danfysik in collaboration with Sintex and Aarhus University. This first Green Magnet has been delivered to ETH Zurich for testing in a compact accelerator mass spectrometer facility. Permanent NdFeB magnets generate a fixed magnetic field of 0.43 T at a gap of 38.5 mm without using electrical power in the H-type 90° bending magnet with a bending radius of 250 mm. Thermal drift of the permanent magnets is passively compensated. Small air cooled trim coils permit fine tuning of the magnetic field. Magnetic field measurements and thermal stability tests show that the Green Magnet fully meets the magnetic requirements of the previously used electromagnet. The use of Green Magnet technology in other accelerator systems like synchrotron light sources is discussed.

THPWA038	GEANT4 Studies of Magnets Activation in the HEBT Line for the European Spallation Source	3714
	C. Bungau, R.J. Barlow, A. Bungau, R. Cywinski, T.R. Edgecock University of Huddersfield, Huddersfield, United Kingdom P. Carlsson, H. Danared, F. Mezei ESS, Lund, Sweden A.I.S. Holm, S.P. Møller, H.D. Thomsen ISA, Aarhus, Denmark
	The High Energy Beam Transport (HEBT) line for the European Spallation Source is designed to transport the beam from the underground linac to the target at the surface level while keeping the beam losses small and providing the requested beam footprint and profile on the target. This paper presents activation studies of the magnets in the HEBT line due to backscattered neutrons from the target and beam interactions inside the collimators producing unstable isotopes.

Paper

Title

Page

A Linear Beam Raster System for the European Spallation Source?

70

H.D. Thomsen, A.I.S. Holm, S.P. Møller
ISA, Aarhus, Denmark

The European Spallation Source (ESS) will, when built, be the most intense neutron source in the world. The neutrons are generated by a high power (5 MW) proton beam impacting a rotating W spallation target. To reduce the replacement frequency of components subjected to the full beam current, i.e. the proton beam window and the target, means to introduce low peak current densities, i.e. flat transverse beam profiles, are necessary. The relatively long beam pulse duration of 2.86 ms (at 14 Hz) leaves ample time to facilitate a Lissajous-like, linear raster system that illuminates a footprint area by sweeping an only moderately enlarged LINAC beamlet. Although slightly more technically challenging, this method has many advantages over the previously envisaged beam expander system based on non-linear DC magnets. The design, specifications, performance, and benefits of the beam raster system will be described and discussed.

THPME001

Permanent Magnets in Accelerators can save Energy, Space, and Cost

3511

F. Bødker, L.O. Baandrup, A. Baurichter, N. Hauge, K.F. Laurberg, B.R. Nielsen, G. Nielsen
Danfysik A/S, Taastrup, Denmark
O. Balling
Aarhus University, Aarhus, Denmark
F.B. Bendixen, P. Kjeldsteen, P. Valler
Sintex A/S, Hobro, Denmark
S.P. Møller, H.D. Thomsen
ISA, Aarhus, Denmark
H.-A. Synal
ETH, Zurich, Switzerland

Green Magnet technology with close to zero electrical power consumption without the need for cooling water saves costs, space and hence spares natural resources. A compact dipole based on permanent magnets has been developed at Danfysik in collaboration with Sintex and Aarhus University. This first Green Magnet has been delivered to ETH Zurich for testing in a compact accelerator mass spectrometer facility. Permanent NdFeB magnets generate a fixed magnetic field of 0.43 T at a gap of 38.5 mm without using electrical power in the H-type 90° bending magnet with a bending radius of 250 mm. Thermal drift of the permanent magnets is passively compensated. Small air cooled trim coils permit fine tuning of the magnetic field. Magnetic field measurements and thermal stability tests show that the Green Magnet fully meets the magnetic requirements of the previously used electromagnet. The use of Green Magnet technology in other accelerator systems like synchrotron light sources is discussed.

THPWA038

GEANT4 Studies of Magnets Activation in the HEBT Line for the European Spallation Source

3714

C. Bungau, R.J. Barlow, A. Bungau, R. Cywinski, T.R. Edgecock
University of Huddersfield, Huddersfield, United Kingdom
P. Carlsson, H. Danared, F. Mezei
ESS, Lund, Sweden
A.I.S. Holm, S.P. Møller, H.D. Thomsen
ISA, Aarhus, Denmark

The High Energy Beam Transport (HEBT) line for the European Spallation Source is designed to transport the beam from the underground linac to the target at the surface level while keeping the beam losses small and providing the requested beam footprint and profile on the target. This paper presents activation studies of the magnets in the HEBT line due to backscattered neutrons from the target and beam interactions inside the collimators producing unstable isotopes.