Nonlocal current-driven heat flow in ideal plasmas
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908464704389120 |
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| author | Mitchell, Nicholas Chapman, David Kagan, Grigory |
| author_facet | Mitchell, Nicholas Chapman, David Kagan, Grigory |
| contents | Electron heat flux is an important and often dominant mechanism of energy transport in a variety of collisional plasmas in a confined fusion or astrophysical context. While nonlocal conductive heat transport, driven by strong temperature gradients, has been investigated extensively in previous literature, nonlocal regimes of the current-driven heat flow and friction have not received the same attention. In this work, a first-principles reduced kinetic method (RKM) is applied to study nonlocal effects on current-driven transport. In addition to nonlocality due to sharp gradients, sufficiently large currents are found to significantly enhance current-driven heat flux due to a novel nonlocal mechanism, with this enhancement being increasingly prevalent for higher effective ionizations $Z^*$. Introducing the dimensionless number $N_u \equiv \vert \boldsymbol{u}_e - \boldsymbol{u}_i \vert / v_{\text{th},e}$, these enhancements occur for even relatively weak flows $N_u \gtrsim 1/100$, analogously to standard nonlocal effects becoming significant for Knudsen numbers $N_K \gtrsim 1/100$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_18430 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nonlocal current-driven heat flow in ideal plasmas Mitchell, Nicholas Chapman, David Kagan, Grigory Plasma Physics Electron heat flux is an important and often dominant mechanism of energy transport in a variety of collisional plasmas in a confined fusion or astrophysical context. While nonlocal conductive heat transport, driven by strong temperature gradients, has been investigated extensively in previous literature, nonlocal regimes of the current-driven heat flow and friction have not received the same attention. In this work, a first-principles reduced kinetic method (RKM) is applied to study nonlocal effects on current-driven transport. In addition to nonlocality due to sharp gradients, sufficiently large currents are found to significantly enhance current-driven heat flux due to a novel nonlocal mechanism, with this enhancement being increasingly prevalent for higher effective ionizations $Z^*$. Introducing the dimensionless number $N_u \equiv \vert \boldsymbol{u}_e - \boldsymbol{u}_i \vert / v_{\text{th},e}$, these enhancements occur for even relatively weak flows $N_u \gtrsim 1/100$, analogously to standard nonlocal effects becoming significant for Knudsen numbers $N_K \gtrsim 1/100$. |
| title | Nonlocal current-driven heat flow in ideal plasmas |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2507.18430 |