Speaker
Allen Mills, Jr.
(University of California Riverside)
Description
One goal of the JPos-17 International Workshop on Physics with Positrons is to ascertain whether it would be a good idea to expand the mission of the Thomas Jefferson National Accelerator Facility to include science with low energy (i.e. “slow”) spin polarized positrons. It is probably true that experimentation with slow positrons would potentially have wide-ranging benefits comparable to those obtained with neutron and x-ray scattering, but it is certain that the full range of these benefits will never be fully available without an infrastructure comparable to that of existing neutron and x-ray facilities. The role for Jefferson Laboratory would therefore be to provide and maintain (1) a dedicated set of machines for making and manipulating high intensity, high brightness beams of polarized slow positrons; (2) a suite of unique and easily used instruments of wide utility that will make efficient use of the positrons; and (3) a group of on-site positron scientists to provide scientific leadership, instrument development, and user support. Some examples will be given of the science that might make a serious investment in a positron facility worthwhile. At the same time, the lessons learned from various proposed [1-4] and successful [5,6] positron facilities will be presented for consideration.
Work supported by the US National Science Foundation under grants PHY 1505903, PHY 1404576, PHY MRI 1532300 and PHY MRI 1429718.
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[3] L. D. Hulett and C. C. Eberle, “A high intensity slow positron facility for the Advanced Neutron Source”, 10th International Conference on Positron Annihilation, Beijing, China, 23-29 May 1994.
[4] S. Okada, H. Sunaga, H. Kaneko, H. Takizawa, A. Kawasuso, K. Yotsumoto, and R. Tanaka, “The Japanese Positron Factory”, AIP Conference Proceedings 475, 349 (1999); doi: http://dx.doi.org/10.1063/1.59250.
[5] C. Huggenschmidt, “Positrons in surface physics”, Surf. Sci. Rept. 71, 547 (2016).
[6] T. Hyodo, et al., “Research progress at the slow positron facility in the institute of materials structure science, KEK”, IOP Conf. Series: Journal of Physics: Conf. Series 791, 012003 (2017).
Primary author
Allen Mills, Jr.
(University of California Riverside)
