Details

Autor(en) / Beteiligte

• Chawla, S
• Wei, M S
• Mishra, R
• Akli, K U
• Chen, C D
• McLean, H S
• Morace, A
• Patel, P K
• Sawada, H
• Sentoku, Y
• Stephens, R B
• Beg, F N

Titel

Effect of target material on fast-electron transport and resistive collimation

Ist Teil von

• Physical review letters, 2013-01, Vol.110 (2), p.025001-025001, Article 025001

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2013

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• The effect of target material on fast-electron transport is investigated using a high-intensity (0.7 ps, 10(20)  W/cm2) laser pulse irradiated on multilayered solid Al targets with embedded transport (Au, Mo, Al) and tracer (Cu) layers, backed with millimeter-thick carbon foils to minimize refluxing. We consistently observed a more collimated electron beam (36% average reduction in fast-electron induced Cu Kα spot size) using a high- or mid-Z (Au or Mo) layer compared to Al. All targets showed a similar electron flux level in the central spot of the beam. Two-dimensional collisional particle-in-cell simulations showed formation of strong self-generated resistive magnetic fields in targets with a high-Z transport layer that suppressed the fast-electron beam divergence; the consequent magnetic channels guided the fast electrons to a smaller spot, in good agreement with experiments. These findings indicate that fast-electron transport can be controlled by self-generated resistive magnetic fields and may have important implications to fast ignition.