Results 41 to 50 of about 18,475 (245)
Stellarator optimization for good magnetic surfaces at the same time as quasisymmetry [PDF]
Physics of Plasmas, 2021 A method is demonstrated to optimize a stellarator’s geometry to eliminate magnetic islands and achieve other desired physics properties at the same time.
M. Landreman +2 more
semanticscholar +1 more source
Physics design point of high-field stellarator reactors [PDF]
Nuclear Fusion, 2021 The ongoing development of electromagnets based on high temperature superconductors has led to the conceptual exploration of high-magnetic-field fusion reactors of the tokamak type, operating at on-axis fields above 10 T.
J. Alonso +6 more
semanticscholar +1 more source
Stellar ages from stellar rotation [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractOur ability to determine stellar ages from measurements of stellar rotation, hinges on how well we can measure the dependence of rotation on age for stars of different masses. Rotation periods for stars in open clusters are essential to determine the relations between stellar age, rotation, and mass.
openaire +2 more sources
Minimization of magnetic forces on stellarator coils [PDF]
Nuclear Fusion, 2021 Magnetic confinement devices for nuclear fusion can be large and expensive. Compact stellarators are promising candidates for cost-reduction, but introduce new difficulties: confinement in smaller volumes requires higher magnetic field, which calls for ...
Rémi Robin, F. Volpe
semanticscholar +1 more source
Symposium - International Astronomical Union, 1986 We have been monitoring the CaII H and K emission in late-type giant stars using the Mt Wilson 60-inch telescope. It is a continuation of work that Olin Wilson began almost 20 years ago. As a result not only have starspot cycles been detected (equivalent to the solar sunspot cycle), but rotation periods have now been measured.
openaire +1 more source
Perturbing an axisymmetric magnetic equilibrium to obtain a quasi-axisymmetric stellarator
, 2020 It is demonstrated that finite-pressure, approximately quasi-axisymmetric stellarator equilibria can be directly constructed (without numerical optimization) via perturbations of given axisymmetric equilibria.
Plunk, G. G.
core +1 more source
Comparison of particle trajectories and collision operators for collisional transport in nonaxisymmetric plasmas [PDF]
, 2014 In this work, we examine the validity of several common simplifying assumptions used in numerical neoclassical calculations for nonaxisymmetric plasmas, both by using a new continuum drift-kinetic code and by considering analytic properties of the ...
A. Mollén +10 more
core +2 more sources
PM4Stell: A prototype permanent magnet stellarator structure
Physics of Plasmas, 2022 Permanent magnets provide a possible solution to simplify complicated stellarator coils. A prototype permanent magnet stellarator structure, PM4Stell, has been funded to demonstrate the technical feasibility of using permanent magnets to create the ...
Caoxiang Zhu +15 more
semanticscholar +1 more source
Contributions to Plasma Physics, Volume 60, Issue 5-6, June-July 2020., 2020 Abstract Advanced divertor configurations modify the magnetic geometry of the divertor to achieve a combination of strong magnetic flux expansion, increased connection length and higher divertor volume—to improve detachment stability, neutral/impurity confinement and heat‐channel broadening.
Thomas Body +4 more
wiley +1 more source
Nuclear Materials and Energy, 2019 In ASDEX Upgrade with full-tungsten wall, boronization is an important tool to control tungsten sources and allow reliable operation at low collisionality. The duration of the beneficial effects is limited by the erosion of the boron layer, in particular
A. Bortolon +12 more
doaj +1 more source