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MO1I1 |
Laser-Ion Acceleration in Plasmas |
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- J. Schreiber
LMU, Garching, Germany
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Chirped pulse amplification (CPA) laser systems such as the Advanced Titanium-Sapphire Laser (ATLAS) operated in the Centre for Advanced Laser Applications (CALA) at the Ludwig-Maximilians-University (LMU) Munich can now provide laser pulses with Petawatt peak power and ~30 fs duration. When tightly focussed onto a target, typically a (sub-)micrometer thin foil, electrons are driven relativistically and seperated from ions, so that they are dragged along. The rectified electric fields that both generate high charge states as well as accelerate ions are of order of the laser fields, ~1 to 100 MV/µm. I will review the physical processes at play and present the characteristics of ion sources, in particular the energy distributions that are accessible with current technology [1]. The fact that ions are energized by ultrashort laser pulses results in a number of intriguing and novel applications, for example time resolved investigation of processes that follow energy deposition in water [2]. I will also report on recent observations of acceleration of gold ions to MeV/u kinetic energy. The observed charge state and energy distributions challenge physical models and inspire nonlinear nuclear physics approaches [3].
[1] J. Schreiber, P. R. Bolton, and K. Parodi, Rev. Sci. Instrum., vol. 87, p. 071101, 2016.
[2] A. Prasselsperger et al., Phys. Rev. Lett., vol. 127, p. 186001, 2021.
[3] F. H. Lindner et al., Sci. Rep., vol. 12, p. 4784, 2022.
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Slides MO1I1 [2.556 MB]
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MO1I2 |
Superconducting Magnets Challenges for the Future |
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- L. Rossi
INFN/LASA, Segrate (MI), Italy
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Funding: This work is partly funded by EC-H2020-Hitriplus GA n.101008548 and by EC-H2020-IFAST GA n. 101004730
Superconducting (SC) magnets has accompanied the development of accelerators in the last 50 years. Starting from the pioneering work for the SC cyclotron in MSU, Chalk River and Milano, to the large FAIR complex, the progress of SC magnets has accompanied the increase in energy and intensity of the accelerators for heavy ions, too. SC magnets are now used for hadron therapy with heavy ions, with the installation and operation of the SC gantry in the carbon therapy center at HIMAC in Japan. The challenges for future SC magnet expand over three frontiers: I) the high field frontier, to enable higher beam energies; II) the fast-pulsing operation frontier, to enable high intensity beams, with high repetition rate synchrotrons; III) medical application frontier, noticeably in hadron therapy, where simple, reliable, medium field SC magnets with affordable cost can become of common use, expanding the utilization of heavy ion therapy.
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Slides MO1I2 [20.862 MB]
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| MO1C3 |
High Voltage Upgrade of the 14UD Tandem Accelerator |
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- T.B. Tunningley, S.T. Battisson, A. Cooper, J.K. Heighway, D.J. Hinde, C. Kafer, T. Kitchen, P. Linardakis, N.R. Lobanovpresenter, C. Notthoff, T. Tempra, B. Tranter, R. Tranter
Research School of Physics and Engineering, Australian National University, Canberra, Australian Capitol Territory, Australia
- R.A. Bosch
UW-Madison/SRC, Madison, Wisconsin, USA
- J.E. Raatz
NEC, Middleton, Wisconsin, USA
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The 14UD at the Australian National University’s Heavy Ion Accelerator Facility (HIAF) operated at a maximum voltage of 15.5 MV after the installation of tubes with a compressed geometry in the 1990s. In recent years, the performance of the accelerator has shown a gradual decline to a maximum operation voltage of ~14.5 MV. There are some fundamental factors that limit the high voltage performance, such as SF6 gas pressure, field enhancement due to triple junctions and total voltage effect. In 2019 ANU initiated the feasibility study of available options to upgrade the entire population of supporting posts, acceleration tubes and grading resistors. In this paper we will discuss the preferred technologies and strategies for successful implementation of this development. The chosen design is based on NEC tubes with magnetic electron suppression and minimized steering of ion beam. The new grading resistors mounting options and improved voltage distribution along accelerator column timeline will be discussed.
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Slides MO1C3 [28.718 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-HIAT2022-MO1C3
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Received ※ 25 May 2022 — Revised ※ 27 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022 |
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