Abstract
Collimation of positrons produced by laser-solid interactions has been observed using an externally applied axial magnetic field. The collimation leads to a narrow divergence positron beam, with an equivalent full width at half maximum beam divergence angle of 4° vs the un-collimated divergence of about 20°. A fraction of the laser-produced relativistic electrons with energies close to those of the positrons is collimated, so the charge imbalance ratio (ne-/ne+) in the co-propagating collimated electron-positron jet is reduced from ∼100 (no collimation) to ∼2.5 (with collimation). The positron density in the collimated beam increased from 5×107cm-3 to 1.9×109cm -3, measured at the 0.6m from the source. This is a significant step towards the grand challenge of making a charge neutral electron-positron pair plasma jet in the laboratory.
| Original language | English |
|---|---|
| Article number | 040703 |
| Journal | Physics of Plasmas |
| Volume | 21 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2014 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
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Magnetic collimation of relativistic positrons and electrons from high intensity laser-matter interactions. / Chen, Hui; Fiksel, G.; Barnak, D.; Chang, Po-Yu; Heeter, R. F.; Link, A.; Meyerhofer, D. D.
In: Physics of Plasmas, Vol. 21, No. 4, 040703, 2014.Research output: Contribution to journal › Article
TY - JOUR
T1 - Magnetic collimation of relativistic positrons and electrons from high intensity laser-matter interactions
AU - Chen, Hui
AU - Fiksel, G.
AU - Barnak, D.
AU - Chang, Po-Yu
AU - Heeter, R. F.
AU - Link, A.
AU - Meyerhofer, D. D.
PY - 2014
Y1 - 2014
N2 - Collimation of positrons produced by laser-solid interactions has been observed using an externally applied axial magnetic field. The collimation leads to a narrow divergence positron beam, with an equivalent full width at half maximum beam divergence angle of 4° vs the un-collimated divergence of about 20°. A fraction of the laser-produced relativistic electrons with energies close to those of the positrons is collimated, so the charge imbalance ratio (ne-/ne+) in the co-propagating collimated electron-positron jet is reduced from ∼100 (no collimation) to ∼2.5 (with collimation). The positron density in the collimated beam increased from 5×107cm-3 to 1.9×109cm -3, measured at the 0.6m from the source. This is a significant step towards the grand challenge of making a charge neutral electron-positron pair plasma jet in the laboratory.
AB - Collimation of positrons produced by laser-solid interactions has been observed using an externally applied axial magnetic field. The collimation leads to a narrow divergence positron beam, with an equivalent full width at half maximum beam divergence angle of 4° vs the un-collimated divergence of about 20°. A fraction of the laser-produced relativistic electrons with energies close to those of the positrons is collimated, so the charge imbalance ratio (ne-/ne+) in the co-propagating collimated electron-positron jet is reduced from ∼100 (no collimation) to ∼2.5 (with collimation). The positron density in the collimated beam increased from 5×107cm-3 to 1.9×109cm -3, measured at the 0.6m from the source. This is a significant step towards the grand challenge of making a charge neutral electron-positron pair plasma jet in the laboratory.
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U2 - 10.1063/1.4873711
DO - 10.1063/1.4873711
M3 - Article
AN - SCOPUS:84899525518
VL - 21
JO - Physics of Plasmas
JF - Physics of Plasmas
SN - 1070-664X
IS - 4
M1 - 040703
ER -