P Helander
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Explore the profile of P Helander including associated specialties, affiliations and a list of published articles.
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Articles
33
Citations
22
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Recent Articles
1.
Mackenbach R, Proll J, Helander P
Phys Rev Lett
. 2023 Jun;
130(23):239901.
PMID: 37354427
This corrects the article DOI: 10.1103/PhysRevLett.128.175001.
2.
Mackenbach R, Proll J, Helander P
Phys Rev Lett
. 2022 May;
128(17):175001.
PMID: 35570436
Any collisionless plasma possesses some "available energy" (AE), defined as that part of the thermal energy that can be converted into instabilities and turbulence. Here, we present a calculation of...
3.
Helander P, Plunk G
Phys Rev Lett
. 2021 Oct;
127(15):155001.
PMID: 34678019
A family of rigorous upper bounds on the growth rate of local gyrokinetic instabilities in magnetized plasmas is derived from the evolution equation for the Helmholtz free energy. These bounds...
4.
Beidler C, Smith H, Alonso A, Andreeva T, Baldzuhn J, Beurskens M, et al.
Nature
. 2021 Oct;
598(7882):E5.
PMID: 34642470
No abstract available.
5.
Beidler C, Smith H, Alonso A, Andreeva T, Baldzuhn J, Beurskens M, et al.
Nature
. 2021 Aug;
596(7871):221-226.
PMID: 34381232
Research on magnetic confinement of high-temperature plasmas has the ultimate goal of harnessing nuclear fusion for the production of electricity. Although the tokamak is the leading toroidal magnetic-confinement concept, it...
6.
Xanthopoulos P, Bozhenkov S, Beurskens M, Smith H, Plunk G, Helander P, et al.
Phys Rev Lett
. 2020 Aug;
125(7):075001.
PMID: 32857529
We theoretically assess two mechanisms thought to be responsible for the enhanced performance observed in plasma discharges of the Wendelstein 7-X stellarator experiment fueled by pellet injection. The effects of...
7.
Helander P, Drevlak M, Zarnstorff M, Cowley S
Phys Rev Lett
. 2020 Mar;
124(9):095001.
PMID: 32202856
It is shown that the magnetic-field coils of a stellarator can, at least in principle, be substantially simplified by the use of permanent magnets. Such magnets cannot create toroidal magnetic...
8.
Plunk G, Xanthopoulos P, Helander P
Phys Rev Lett
. 2018 Jan;
119(13):139901.
PMID: 29341678
This corrects the article DOI: 10.1103/PhysRevLett.118.105002.
9.
Helander P, Newton S, Mollen A, Smith H
Phys Rev Lett
. 2017 Apr;
118(15):155002.
PMID: 28452542
A potential threat to the performance of magnetically confined fusion plasmas is the problem of impurity accumulation, which causes the concentration of highly charged impurity ions to rise uncontrollably in...
10.
Plunk G, Xanthopoulos P, Helander P
Phys Rev Lett
. 2017 Mar;
118(10):105002.
PMID: 28339251
In the complex 3D magnetic fields of stellarators, ion-temperature-gradient turbulence is shown to have two distinct saturation regimes, as revealed by petascale numerical simulations and explained by a simple turbulence...