Speaker
Dr
Marc Hausmann
(Michigan State University)
Description
The efficient collection of projectile fragments and fission fragments with in-flight separators in many cases requires a large momentum acceptance. For example, the planned Advanced Rare Isotope Separator (ARIS) [1] at the future Facility for Rare Isotope Beams at Michigan State University has a 10% momentum acceptance. Such broad momentum distributions can be compressed using appropriately shaped energy degraders [2], and these energy degraders can be used to generate mass-separation at the same time [3]. Here we report on an experimental test of this momentum-compression scheme using the A1900 fragment separator [4] at the National Superconducting Cyclotron Laboratory with dedicated wedge-shaped energy degraders and a matching beam optics setting. The energy distribution of the beam after momentum compression was measured with a stack of semiconductor detectors.
References
[1] M. Hausmann, et al., Design of the Advanced Rare Isotope Separator ARIS at FRIB, Nuclear Instruments and Methods in Physics Research B 317 (2013) 349.
[2] L. Bandura, et al., Fragment separator momentum compression schemes, Nuclear Instruments and Methods in Physics Research A 645 (2011) 182.
[3] C. Scheidenberger, et al., Energy and range focusing of in-flight separated exotic nuclei - A study for the energy-buncher stage of the low-energy branch of the Super-FRS Nuclear Instruments and Methods in Physics Research B 204 (2003) 119.
[4] D. J. Morrissey, et al., Commissioning of the A1900 projectile fragment separator, Nuclear Instruments and Methods in Physics Research B 204 (2003) 90.
Material based on work supported by the US National Science Foundation under cooperative agreements PHY-0606007 and PHY-1102511 and by the US DoE Office of Science under cooperative agreement DE-SC0000661.
Primary author
Dr
Marc Hausmann
(Michigan State University)
Co-authors
Prof.
Alan Amthor
(Bucknell University)
Andreas Stolz
(NSCL / Michigan State University)
Prof.
Bela Erdelyi
(Northern Illinois University)
Prof.
Bradley M. Sherrill
(National Superconducting Cyclotron Laboratory - Michigan State University and Facility for Rare Isotope Beams - Michigan State University)
Dr
Chandana Sumithrarachchi
(National Superconducting Cyclotron Laboratory)
Dr
Daniel Bazin
(National Superconducting Cyclotron Laboratory - Michigan State University)
Mr
David Morrissey
(MSU/NSCL)
Dr
Fabio Farinon
(Facility for Rare Isotope Beams - Michigan State University)
Dr
Helmut Weick
(GSI Helmholtzzentrum)
Dr
Hiroyuki Takeda
(RIKEN)
Dr
Jerry Nolen
(Argonne National Laboratory)
Dr
Jill S. Berryman
(National Superconducting Cyclotron Laboratory - Michigan State University)
Dr
Jorge Pereira
(National Superconducting Cyclotron Laboratory - Michigan State University)
Dr
Laura Bandura
(NSCL, Michigan State University)
Dr
Mauricio Portillo
(Michigan State University)
Dr
Oleg Tarasov
(NSCL / MSU)
Dr
Shashikant Manikonda
(Argonne National Laboratory)
Dr
Thomas Baumann
(National Superconducting Cyclotron Laboratory)
Tom Ginter
(Michigan State University)
Dr
Toshiyuki Kubo
(RIKEN)