IPAC2017 - Classification: 04 Hadron Accelerators / A21 Secondary Beams

Paper	Title	Page
TUPVA051	Magnets and Wien Filters for SECAR	2191
	F. Bødker, N. Hauge, J. Kristensen Danfysik A/S, Taastrup, Denmark G.P.A. Berg, M. Couder University of Notre Dame, Indiana, USA H. Schatz NSCL, East Lansing, Michigan, USA
	The Separator for Capture Reactions, SECAR, is being built at Michigan State University for the study of low-energy capture reactions. The high performance magnets and two large Wien filters required to reach the very high recoil mass separation factor are being designed and produced at Danfysik to the SECAR specifications. The 2.4 m long Wien filters with a weight of 35 ton each including a large vacuum tank have high electrode voltages of ±300 kV combined with a magnetic field of 0.12 T. Challenging design requirements for integrated magnetic and electrostatic field homogeneity combined with tight tolerance on the effective lengths have been meet. The dipole magnets for this facility are special in having stringent ±0.5 mm effective magnetic length specifications in a wide excitation range and the transverse field boundary variation is described by a 4th order polynomial. Most of the dipoles are made with variable segmented field clamps in order to keep the deviation of the magnetic fringe field boundary within the required ±0.1 mm. The wide range of different quadrupole, sextupole and octupole magnets are required to meet the specified magnetic length with a tight tolerance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA051
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TUPVA060	Upgrade of GSI HADES Beamline in Preparation for High Intensity Runs	2214
	M. Sapinski, P. Boutachkov, S. Damjanovic, K. Dermati, C.M. Kleffner, J. Pietraszko, T. Radon, S. Ratschow, S. Reimann, W. Sturm, B. Walasek-Höhne GSI, Darmstadt, Germany
	HADES is a fixed target experiment using SIS18 heavy-ion beams. It investigates the microscopic properties of matter formed in heavy-ion, proton and pion - induced reactions in the 1-3.5 GeV/u energy regime. In 2014 HADES used a secondary pion beam produced by interaction between high-intensity nitrogen primary beam and a beryllium target. In these conditions beam losses, generated by slow extraction and beam transport to the experimental area, led to activation of the beam line elements and triggered radiation alarms. The primary beam intensity had to be reduced and the beam optics modified in order to keep radiation levels within the allowed limits. Similar beam conditions are requested by HADES experiment for upcoming run in 2018 and in the following years. Therefore, a number of measures have been proposed to improve beam transmission and quality. These measures are: additional shielding, additional beam instrumentation, modification of beam optics and increase of vacuum chambers' apertures in critical locations. The optics study and preliminary results of FLUKA simulations for optimization of location of loss detectors are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA060
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TUPVA124	The Beam Lines Design for the CERN Neutrino Platform in the CERN North Area and an Outlook on Their Expected Performance	2382
	N.C. Charitonidis, M. Brugger, I. Efthymiopoulos, L. Gatignon, E.M. Nowak, I. Ortega Ruiz CERN, Geneva, Switzerland Y. Karyotakis IN2P3-LAPP, Annecy-le-Vieux, France P.R. Sala Istituto Nazionale di Fisica Nucleare, Milano, Italy
	In the framework of the CERN Neutrino Platform project, extensions to the existing SPS North Area H2 and H4 secondary beam lines, able to provide low-energy charged particles in the momentum range of 0.4 to 12 GeV, have been designed. The parameters of these very low energy beam lines, the expected beam composition as seen by the experiments as well as an outlook on their expected performance are summarized in this paper. Results from Monte-Carlo simulations, important for the optimization of the future instrumentation of the beam lines (serving both the purpose of beam tuning and the experiments' needs for particle identification and momentum measurements), are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA124
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TUPVA126	The SPS Beam Dump Facility	2389
	M. Lamont, G. Arduini, M. Battistin, M. Brugger, M. Calviani, F. B. Dos Santos Pedrosa, M.A. Fraser, L. Gatignon, S.S. Gilardoni, B. Goddard, J.L. Grenard, C. Heßler, R. Jacobsson, V. Kain, K. Kershaw, E. Lopez Sola, J.A. Osborne, A. Perillo-Marcone, H. Vincke CERN, Geneva, Switzerland
	The proposed SPS beam dump facility (BDF) is a fixed-target facility foreseen to be situated at the North Area of the SPS. Beam dump in this context implies a target aimed at absorbing the majority of incident protons and containing most of the cascade generated by the primary beam interaction. The aim is a general purpose fixed target facility, which in the initial phase is aimed at the Search for Hidden Particles (SHiP) experiment. Feasibility studies are ongoing at CERN to address the key challenges of the facility. These challenges include: slow resonant extraction from the SPS; a target that has the two-fold objective of producing charged mesons as well as stopping the primary proton beam; and radiation protection considerations related to primary proton beam with a power of around 355 kW. The aim of the project is to complete the key technical feasibility studies in time for the European Strategy for Particle Physics (ESPP) update foreseen in 2020. This is in conjunction with the recommendation by the CERN Research Board to the SHiP experiment to prepare a comprehensive design study as input to the ESPP.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA126
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Paper

Title

Page

Magnets and Wien Filters for SECAR

2191

F. Bødker, N. Hauge, J. Kristensen
Danfysik A/S, Taastrup, Denmark
G.P.A. Berg, M. Couder
University of Notre Dame, Indiana, USA
H. Schatz
NSCL, East Lansing, Michigan, USA

The Separator for Capture Reactions, SECAR, is being built at Michigan State University for the study of low-energy capture reactions. The high performance magnets and two large Wien filters required to reach the very high recoil mass separation factor are being designed and produced at Danfysik to the SECAR specifications. The 2.4 m long Wien filters with a weight of 35 ton each including a large vacuum tank have high electrode voltages of ±300 kV combined with a magnetic field of 0.12 T. Challenging design requirements for integrated magnetic and electrostatic field homogeneity combined with tight tolerance on the effective lengths have been meet. The dipole magnets for this facility are special in having stringent ±0.5 mm effective magnetic length specifications in a wide excitation range and the transverse field boundary variation is described by a 4th order polynomial. Most of the dipoles are made with variable segmented field clamps in order to keep the deviation of the magnetic fringe field boundary within the required ±0.1 mm. The wide range of different quadrupole, sextupole and octupole magnets are required to meet the specified magnetic length with a tight tolerance.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA051

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TUPVA060

Upgrade of GSI HADES Beamline in Preparation for High Intensity Runs

2214

M. Sapinski, P. Boutachkov, S. Damjanovic, K. Dermati, C.M. Kleffner, J. Pietraszko, T. Radon, S. Ratschow, S. Reimann, W. Sturm, B. Walasek-Höhne
GSI, Darmstadt, Germany

HADES is a fixed target experiment using SIS18 heavy-ion beams. It investigates the microscopic properties of matter formed in heavy-ion, proton and pion - induced reactions in the 1-3.5 GeV/u energy regime. In 2014 HADES used a secondary pion beam produced by interaction between high-intensity nitrogen primary beam and a beryllium target. In these conditions beam losses, generated by slow extraction and beam transport to the experimental area, led to activation of the beam line elements and triggered radiation alarms. The primary beam intensity had to be reduced and the beam optics modified in order to keep radiation levels within the allowed limits. Similar beam conditions are requested by HADES experiment for upcoming run in 2018 and in the following years. Therefore, a number of measures have been proposed to improve beam transmission and quality. These measures are: additional shielding, additional beam instrumentation, modification of beam optics and increase of vacuum chambers' apertures in critical locations. The optics study and preliminary results of FLUKA simulations for optimization of location of loss detectors are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA060

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TUPVA124

The Beam Lines Design for the CERN Neutrino Platform in the CERN North Area and an Outlook on Their Expected Performance

2382

N.C. Charitonidis, M. Brugger, I. Efthymiopoulos, L. Gatignon, E.M. Nowak, I. Ortega Ruiz
CERN, Geneva, Switzerland
Y. Karyotakis
IN2P3-LAPP, Annecy-le-Vieux, France
P.R. Sala
Istituto Nazionale di Fisica Nucleare, Milano, Italy

In the framework of the CERN Neutrino Platform project, extensions to the existing SPS North Area H2 and H4 secondary beam lines, able to provide low-energy charged particles in the momentum range of 0.4 to 12 GeV, have been designed. The parameters of these very low energy beam lines, the expected beam composition as seen by the experiments as well as an outlook on their expected performance are summarized in this paper. Results from Monte-Carlo simulations, important for the optimization of the future instrumentation of the beam lines (serving both the purpose of beam tuning and the experiments' needs for particle identification and momentum measurements), are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA124

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TUPVA126

The SPS Beam Dump Facility

2389

M. Lamont, G. Arduini, M. Battistin, M. Brugger, M. Calviani, F. B. Dos Santos Pedrosa, M.A. Fraser, L. Gatignon, S.S. Gilardoni, B. Goddard, J.L. Grenard, C. Heßler, R. Jacobsson, V. Kain, K. Kershaw, E. Lopez Sola, J.A. Osborne, A. Perillo-Marcone, H. Vincke
CERN, Geneva, Switzerland

The proposed SPS beam dump facility (BDF) is a fixed-target facility foreseen to be situated at the North Area of the SPS. Beam dump in this context implies a target aimed at absorbing the majority of incident protons and containing most of the cascade generated by the primary beam interaction. The aim is a general purpose fixed target facility, which in the initial phase is aimed at the Search for Hidden Particles (SHiP) experiment. Feasibility studies are ongoing at CERN to address the key challenges of the facility. These challenges include: slow resonant extraction from the SPS; a target that has the two-fold objective of producing charged mesons as well as stopping the primary proton beam; and radiation protection considerations related to primary proton beam with a power of around 355 kW. The aim of the project is to complete the key technical feasibility studies in time for the European Strategy for Particle Physics (ESPP) update foreseen in 2020. This is in conjunction with the recommendation by the CERN Research Board to the SHiP experiment to prepare a comprehensive design study as input to the ESPP.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA126

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