Theoretical model of current propagation in a helical coil with varying geometry and screen tube

Author:

Lacoste C. L. C.123ORCID,Hirsch-Passicos A.12ORCID,d’Humières E.2ORCID,Tikhonchuk V. T.24ORCID,Antici P.3ORCID,Bardon M.12ORCID

Affiliation:

1. CEA-CESTA 1 , Le Barp 33114, France

2. CELIA, University of Bordeaux-CNRS-CEA 2 , Talence 33405, France

3. INRS EMT 3 , Varennes, Quebec J3X 1P7, Canada

4. Extreme Light Infrastructure ERIC, ELI-Beamlines Facility 4 , Dolnì Břežany 25142, Czech Republic

Abstract

An analytical model of current propagation in a helical coil with varying geometry is developed. It can be used for post-acceleration and post-focusing of ions produced via laser-driven target normal sheath acceleration and generation of electromagnetic pulses. We calculate the current that propagates in a helical coil and suggest a method for improving its dispersion properties using a screening tube and with pitch and radius variation. The electromagnetic fields calculated with the analytical model are in agreement with particle-in-cell simulations. The model provides insights into the physics of current propagation in helical coils with varying geometries and enables a numerical implementation for rapid proton spectrum computations, which facilitate the design of such coils for future experiments.

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

AIP Publishing

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