TY - JOUR
T1 - Design of SECAR a recoil mass separator for astrophysical capture reactions with radioactive beams
AU - Couder, M.
AU - Perdikakis, Georgios
N1 - Funding Information:
The authors would like to express their special thanks to Georg Bollen, Thomas Glasmacher, Carl Gross, Marc Hausmann, Dave Hutcheon, Syd Kreitzman, I-Yang Lee, Daniela Leitner, Jerry Nolen, Chris Ruiz, and Brad Sherrill for their helpful discussions and comments. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics , under Award Number DE-SC0014384 and Contract DE-AC02-06CH11357 and by the National Science Foundation under grant No. PHY 08-22648 , PHY-1430152 , and PHY-1624942 (Joint Institute for Nuclear Astrophysics and JINA-CEE). Additional funds were provided by the Michigan State University and the University of Notre Dame .
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018
Y1 - 2018
N2 - A recoil mass separator SECAR has been designed for the purpose of studying low-energy (p,γ) and (α,γ) reactions in inverse kinematics with radioactive beams for masses up to about A = 65. Their reaction rates are of importance for our understanding of the energy production and nucleosynthesis during explosive hydrogen and helium burning. The radiative capture reactions take place in a windowless hydrogen or He gas target at the entrance of the separator, which consists of four Sections. The first Section selects the charge state of the recoils. The second and third Sections contain Wien Filters providing high mass resolving power to separate efficiently the intense beam from the few reaction products. In the following fourth Section, the reaction products are guided into a detector system capable of position, angle and time-of-flight measurements. In order to accept the complete kinematic cone of recoil particles including multiple scattering in the target in the center of mass energy range of 0.2 MeV to 3.0 MeV, the system must have a large polar angle acceptance of ± 25 mrad. This requires a careful minimization of higher order aberrations. The present system will be installed at the NSCL ReA3 accelerator and will be used with the much higher beam intensities of the FRIB facility when it becomes available.
AB - A recoil mass separator SECAR has been designed for the purpose of studying low-energy (p,γ) and (α,γ) reactions in inverse kinematics with radioactive beams for masses up to about A = 65. Their reaction rates are of importance for our understanding of the energy production and nucleosynthesis during explosive hydrogen and helium burning. The radiative capture reactions take place in a windowless hydrogen or He gas target at the entrance of the separator, which consists of four Sections. The first Section selects the charge state of the recoils. The second and third Sections contain Wien Filters providing high mass resolving power to separate efficiently the intense beam from the few reaction products. In the following fourth Section, the reaction products are guided into a detector system capable of position, angle and time-of-flight measurements. In order to accept the complete kinematic cone of recoil particles including multiple scattering in the target in the center of mass energy range of 0.2 MeV to 3.0 MeV, the system must have a large polar angle acceptance of ± 25 mrad. This requires a careful minimization of higher order aberrations. The present system will be installed at the NSCL ReA3 accelerator and will be used with the much higher beam intensities of the FRIB facility when it becomes available.
M3 - Article
SN - 0168-9002
VL - 877
SP - 87
EP - 103
JO - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
JF - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ER -