Rotation Prevents Islands - 53rd Meeting
Rotation Prevents Islands - 53rd Meeting
Engineering is the art of making what you want from what you can get at a profit.
I tried to tell them this 15 years ago .... should have seen the looks of derision targeted at a "mere" hydro-dynamicist.
SImply, axial fluid flow through a curved pipe is unstable to the first order without a bulk transverse rotation. A torus (tokomak) is basically a curved pipe.
It has taken them 40 years to figure this out, whoop-dee-do.
SImply, axial fluid flow through a curved pipe is unstable to the first order without a bulk transverse rotation. A torus (tokomak) is basically a curved pipe.
It has taken them 40 years to figure this out, whoop-dee-do.
There was some discussion here a long time ago (in internet years) about a rotating AC field superimposed on the Polywell DC field for POPS. It wouldn't be hard to do. Useful? Well that was conjecture.icarus wrote:I tried to tell them this 15 years ago .... should have seen the looks of derision targeted at a "mere" hydro-dynamicist.
SImply, axial fluid flow through a curved pipe is unstable to the first order without a bulk transverse rotation. A torus (tokomak) is basically a curved pipe.
It has taken them 40 years to figure this out, whoop-dee-do.
Engineering is the art of making what you want from what you can get at a profit.
Slough and Co. have also used rotating fields for FRCs:
AN OVERVIEW OF THE STAR THRUST EXPERIMENT
AN OVERVIEW OF THE STAR THRUST EXPERIMENT
If they are using IGBTs the coils are shock excited (500 KHz desired freq.). Thus they get another advantage out of a high Q setup.DeltaV wrote:Slough and Co. have also used rotating fields for FRCs:
AN OVERVIEW OF THE STAR THRUST EXPERIMENT
Engineering is the art of making what you want from what you can get at a profit.
Let me revise and extend my remarks. IGBT switching is limited to about 50KHz for the usual devices and can be pushed to about 100 KHz with higher losses (caused by slow turn off of the intrinsic bipolar). So if they are using IGBTs they are sub-harmonically exciting their set up and using the high Q to maintain the current between power pulses.
Engineering is the art of making what you want from what you can get at a profit.
Magnetohydrodynamics has only been around for 40 years... ?????icarus wrote:I tried to tell them this 15 years ago .... should have seen the looks of derision targeted at a "mere" hydro-dynamicist.
SImply, axial fluid flow through a curved pipe is unstable to the first order without a bulk transverse rotation. A torus (tokomak) is basically a curved pipe.
It has taken them 40 years to figure this out, whoop-dee-do.
Throwing my life away for this whole Fusion mess.
Actually, I think he is referenceing an ~40 year timeframe for functional tokamaks.Robthebob wrote:Magnetohydrodynamics has only been around for 40 years... ?????icarus wrote:I tried to tell them this 15 years ago .... should have seen the looks of derision targeted at a "mere" hydro-dynamicist.
SImply, axial fluid flow through a curved pipe is unstable to the first order without a bulk transverse rotation. A torus (tokomak) is basically a curved pipe.
It has taken them 40 years to figure this out, whoop-dee-do.
Wikipedia wrote:The group constructed the first tokamaks, the most successful being T-3 and its larger version T-4. T-4 was tested in 1968 in Novosibirsk, conducting the first ever quasistationary thermonuclear fusion reaction.[3]