Journal article

Publication year: 2002

Pages: 117-131

Journal: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

Volume number: 187

Issue number: 1

ISSN: 0168-583X

eISSN: 1872-9584

Open access status: Green

DOI Link: https://doi.org/10.1016/S0168-583X(01)00844-8

Publisher: Elsevier

Abstract: 
Studies have been conducted to determine the feasibility of using collisional cooling for reducing emittances and energy spreads in negative-ion beams to levels commensurate with effective isobaric purification with conventional high-resolution electromagnetic isobar separators as required for use at the Holifield Radioactive Ion Beam Facility (HRIBF). We have designed a gas-filled radio frequency quadrupole ion cooler equipped with provisions for retarding energetic negative-ion beams to energies below thresholds for electron detachment at injection and for re-acceleration to initial energies after the cooling process. The device has been used to cool several ion beams with initial energy spreads, DeltaE > 10 eV to final energy spreads, DeltaE similar to 2 eV FWHM, including O- and F-. Overall transmission efficiencies of similar to14% for F- beams have been obtained. Experimental results show that electron detachment is the major loss mechanism for negative ions. (C) 2002 Elsevier Science B.V. All rights reserved.

Harvard Citation style: Liu, Y., Liang, J., Alton, G., Beene, J., Zhou, Z. and Wollnik, H. (2002) Collisional cooling of negative-ion beams, Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 187(1), pp. 117-131. https://doi.org/10.1016/S0168-583X(01)00844-8

APA Citation style: Liu, Y., Liang, J., Alton, G., Beene, J., Zhou, Z., & Wollnik, H. (2002). Collisional cooling of negative-ion beams. Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 187(1), 117-131. https://doi.org/10.1016/S0168-583X(01)00844-8