Tootfinder

A really detailed superconducting magnet paper; all about the physical build, of a huge one for fusion use; 270km of REBCO tape, and weighing 10 Tonnes; some bits are fascinating, like the flood filling of the tape with solder.
https://ieeexplore.ieee.org/document/10411128

Design, Fabrication, and Assembly of the SPARC Toroidal Field Model Coil
The SPARC Toroidal Field Model Coil (TFMC) is the first large-scale (∼3 m), high-field (∼20 T) superconducting fusion magnet based on Rare Earth Yttrium Barium Copper Oxide (REBCO). Weighing 10,058 kg and utilizing 270 km of REBCO, the TFMC is a non-insulated, stack-in-plate style superconducting magnet. It has three main components: (1) the winding pack; (2) the structural case; and (3) the case extensions, or plena. The winding pack is composed of sixteen single pancakes with two terminat…

A really detailed superconducting magnet paper; all about the physical build, of a huge one for fusion use; 270km of REBCO tape, and weighing 10 Tonnes; some bits are fascinating, like the flood filling of the tape with solder.
https://ieeexplore.ieee.org/document/10411128

Design, Fabrication, and Assembly of the SPARC Toroidal Field Model Coil
The SPARC Toroidal Field Model Coil (TFMC) is the first large-scale (∼3 m), high-field (∼20 T) superconducting fusion magnet based on Rare Earth Yttrium Barium Copper Oxide (REBCO). Weighing 10,058 kg and utilizing 270 km of REBCO, the TFMC is a non-insulated, stack-in-plate style superconducting magnet. It has three main components: (1) the winding pack; (2) the structural case; and (3) the case extensions, or plena. The winding pack is composed of sixteen single pancakes with two terminat…

The experience of totality is such a surreal experience. It's not just the sun being blocked out by the giant tortilla in the sky. It looked like the sun was setting/rising from every direction around. Starlings started chirping and geese started flying. Definitely worth seeing one in real life. No crappy cell phone picture could ever describe the 4 minute experience of the Great American Eclipse of 2024.
The Great American Traffic Jam of 2024 now follows.

Generation of optical toroidal vortex with circular asymmetric gratings
Weichao Liu, Jie Cheng, Chenhao Wan
https://arxiv.org/abs/2404.11921 https://

Generation of optical toroidal vortex with circular asymmetric gratings
Toroidal vortex, a topological structure commonly observed in nature, exist in various types such as bubbles produced by dolphins and the air flow surrounding a flying dandelion. A toroidal vortex corresponds to a spatiotemporal wave packet in the shape of a donut that propagates in the direction perpendicular to the plane of the ring. In this work, we propose a circular asymmetric grating to generate vortex rings. A cylindrical vector wave packet is transformed by the device into a transmitted…

4/5
For those grappling with low energy, magnesium may serve as the much-needed elixir. Essential in ATP creation – the cornerstone of cellular energy – magnesium deficiency can usher in fatigue and compromised physical performance. Research targeting athletes discovered enhanced triathlon times following a four-week magnesium supplementation, attributed to efficient energy production and optimized oxygen utilization.

Okay, I get matching phase and frequency before grid connect. Synchroscope makes sense
They were messing with the amount of water let in to speed up and slow down the turbine,
But once it goes grid connect, they open the throttle wide open (I guess to push more watts?) And... It holds phase? How's that work?
Where is the exciter routed before grid connect? Straight back to itself? Straight to ground? Disconnected terminals?
What force resists speeding up beforehand? Just friction?
What force resists going out of phase afterwards? Why can you suddenly dump as much water as you like in the wicket gates?
What's the autopilot adjusting or following at that point? Solar inverters are grid following, what about hydro governors?
What makes it force disconnect during shutdown? A loss of watts? A loss of phase? A loss of frequency?
#hydro #electric #powerplant start-up
And this one is an auto shutdown:
#electricalengineering

Decoupled sound and amplitude modes in trapped dipolar supersolids
Jens Hertkorn, Philipp St\"urmer, Koushik Mukherjee, Kevin S. H. Ng, Paul Uerlings, Fiona Hellstern, Lucas Lavoine, Stephanie Reimann, Tilman Pfau, Ralf Klemt
https://arxiv.org/abs/2404.12384

Decoupled sound and amplitude modes in trapped dipolar supersolids
We theoretically investigate elementary excitations of dipolar quantum gases across the superfluid to supersolid phase transition in a toroidal trap. We show how decoupled first sound, second sound, and Higgs modes emerge by following their origin from superfluid modes across the transition. The structure of these excitations reveals the interplay between crystal and superfluid oscillations. Our results unify previous notions of coupled Goldstone and Higgs modes in harmonic traps, allowing us t…

Direct, simple, and efficient computation of all components of the virtual-casing magnetic field in axisymmetric geometries with Kapur-Rokhlin quadrature
Evan Toler, Antoine Cerfon, Dhairya Malhotra
https://arxiv.org/abs/2404.02799

Direct, simple, and efficient computation of all components of the virtual-casing magnetic field in axisymmetric geometries with Kapur-Rokhlin quadrature
In a recent publication (Toler et al. 2023), we demonstrated that for axisymmetric geometries, the Kapur-Rokhlin quadrature rule provided an efficient and high-order accurate method for computing the normal component, on the plasma surface, of the magnetic field due to the toroidal current flowing in the plasma, via the virtual-casing principle. The calculation was indirect, as it required the prior computation of the magnetic vector potential from the virtual-casing principle, followed by the …

Direct, simple, and efficient computation of all components of the virtual-casing magnetic field in axisymmetric geometries with Kapur-Rokhlin quadrature
Evan Toler, Antoine Cerfon, Dhairya Malhotra
https://arxiv.org/abs/2404.02799

Direct, simple, and efficient computation of all components of the virtual-casing magnetic field in axisymmetric geometries with Kapur-Rokhlin quadrature
In a recent publication (Toler et al. 2023), we demonstrated that for axisymmetric geometries, the Kapur-Rokhlin quadrature rule provided an efficient and high-order accurate method for computing the normal component, on the plasma surface, of the magnetic field due to the toroidal current flowing in the plasma, via the virtual-casing principle. The calculation was indirect, as it required the prior computation of the magnetic vector potential from the virtual-casing principle, followed by the …