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Enhancing positron production using front surface target structures

Jiang, S. and Link, A. and Canning, D. and Fooks, J. A. and Kempler, P. A. and Kerr, S. and Kim, J. and Krieger, M. and Lewis, N. S. and Wallace, R. and Williams, G. J. and Yalamanchili, S. and Chen, Hui (2021) Enhancing positron production using front surface target structures. Applied Physics Letters, 118 (9). Art. No. 094101. ISSN 0003-6951.

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We report a target design which produced a substantial gain in relativistic electron-positron pair production using high-intensity lasers and targets with large-scale micro-structures on their surface. Comparing to an unstructured target, a selected Si microwire array target yielded a near 100% increase in the laser-to-positron conversion efficiency and produced a 10 MeV increase in the average emitted positron energy under nominally the same experimental conditions. We had established a multi-scale particle-in-cell simulation scheme to simulate both the laser absorption and the subsequent pair productions in a thick metal target. The experimental results are supported by the simulations demonstrating the performance increase is due to a higher conversion efficiency of laser energy into electrons with kinetic energies greater than 10 MeV due to enhanced direct laser acceleration of electrons enabled by the microwire array.

Item Type:Article
Related URLs:
URLURL TypeDescription
Jiang, S.0000-0002-0381-3846
Canning, D.0000-0001-9576-2013
Fooks, J. A.0000-0002-3445-4727
Kempler, P. A.0000-0003-3909-1790
Kim, J.0000-0002-5188-7815
Lewis, N. S.0000-0001-5245-0538
Williams, G. J.0000-0002-6495-5696
Chen, Hui0000-0002-0181-1695
Additional Information:© 2021 Published under license by AIP Publishing. Submitted: 19 November 2020; Accepted: 8 February 2021; Published Online: 2 March 2021. We thank the OMEGA EP team for laser operation and technical support. This work was performed under the auspices of the U.S. DOE by LLNL under Contract No. DEAC5207NA27344, and funded by LDRD (No. 17ERD010). The fabrication of Si microwire arrays was supported through the Office of Science of the U.S. Department of Energy under Award No. DE- SC0004993. Additional support for this work was provided by the Lockheed Martin Corporation (Award No. 4103810021). We thank the staff at the Kavli Nanoscience Institute at Caltech for their technical assistance with fabrication. Data Availability: The data that support the findings of this study are available from the corresponding author upon reasonable request.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC52-07NA27344
Los Alamos National Laboratory17ERD010
Department of Energy (DOE)DE-SC0004993
Lockheed Martin4103810021
Issue or Number:9
Record Number:CaltechAUTHORS:20210303-071742285
Persistent URL:
Official Citation:Enhancing positron production using front surface target structures. Appl. Phys. Lett. 118, 094101 (2021); doi: 10.1063/5.0038222
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108282
Deposited By: Tony Diaz
Deposited On:03 Mar 2021 19:10
Last Modified:03 Mar 2021 19:10

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