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Online charge measurement for petawatt laser-driven ion acceleration

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/5.0096423· OSTI ID:1994360
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [3];  [2];  [2];  [2];  [2];  [2];  [2];  [4];  [2]
  1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Technical University of Darmstadt (Germany)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory 3 , Berkeley, California 94720, USA
  4. Technical University of Darmstadt (Germany); Focused Energy GmbH, Darmstadt (Germany)
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Laser-driven ion beams have gained considerable attention for their potential use in multidisciplinary research and technology. Preclinical studies into their radiobiological effectiveness have established the prospect of using laser-driven ion beams for radiotherapy. In particular, research into the beneficial effects of ultrahigh instantaneous dose rates is enabled by the high ion bunch charge and uniquely short bunch lengths present for laser-driven ion beams. Such studies require reliable, online dosimetry methods to monitor the bunch charge for every laser shot to ensure that the prescribed dose is accurately applied to the biological sample. In this paper, we present the first successful use of an Integrating Current Transformer (ICT) for laser-driven ion accelerators. This is a noninvasive diagnostic to measure the charge of the accelerated ion bunch. It enables online estimates of the applied dose in radiobiological experiments and facilitates ion beam tuning, in particular, optimization of the laser ion source, and alignment of the proton transport beamline. We present the ICT implementation and the correlation with other diagnostics, such as radiochromic films, a Thomson parabola spectrometer, and a scintillator.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1994360
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 93; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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