NDLI: Physics design for the compression and focusing of heavy ion beams

Content Provider	IEEE Xplore Digital Library
Author	Wong, C.Y.J. Yu, S.S. Logan, B.G.
Copyright Year	2013
Description	Author affiliation: Chinese Univ. of Hong Kong, Shatin, China (Wong, C.Y.J.; Yu, S.S.) \|\| Lawrence Berkeley Nat. Lab., Berkeley, CA, USA (Logan, B.G.)
Abstract	Summary form only given. Heavy ion beams are suitable for heating matter in the studies of high energy density physics and inertial fusion. To obtain the required rapid target heating and high beam intensity, the beam has to be longitudinally compressed and radially focused. The former can be achieved by neutralized drift compression which has been demonstrated by experiments [P. K. Roy et al., Phys. Rev. Lett. 95, 234801 (2005)]. After imparting a head-to-tail velocity gradient to the beam, the beam compresses as it drifts in a dense background plasma where the effects of space charge are neutralized. For low energy beams, the beam velocity is ramped by induction modules with tailored voltage waveforms. This method is, however, technically difficult and highly expensive in the high energy regime. A physics design is introduced to generate a velocity tilt for high energy beams at a low cost. By sweeping beam ions transversely with a time-dependent dipole upstream of a wedge, different slices of the beam pass through matter of variable thickness. The energy loss creates a velocity tilt for the drifting beam which subsequently compresses within a dense background plasma. Using stopping power models and particle codes, once the target position is given, the shape of the wedge can be designed accordingly to give maximum compression at the target. Simulations have been conducted using typical beam parameters of FAIR at GSI and HIAF at IMP Lanzhou. The results show that energy straggling has negligible effect on the bunching factor, whereas beam ion scattering and fragmentation within the wedge depend on the type of beam ion, beam energy and wedge material. A decisive factor affecting the current amplification at the target is the ratio between the head-to-tail sweep length and the spot size on the wedge. Based on these results, an experiment that demonstrates longitudinal compression using a wedge is proposed. The wedge is also incorporated into the design of a full system that delivers both transverse focusing and temporal compression. Numerical studies are employed to determine the time-dependent parameters of the dipole and quadrupole elements. Simulation results are presented and the constraints and trade-offs in the design are discussed.
Starting Page	1
Ending Page	1
File Size	96760
Page Count	1
File Format	PDF
ISBN	9781467351713
ISSN	07309244
DOI	10.1109/PLASMA.2013.6633389
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ion beam effects Focusing Heating Plasmas
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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