stacked toroids for better electron injection?

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happyjack27
Posts: 1431
Joined: Wed Jul 14, 2010 5:27 pm

stacked toroids for better electron injection?

Postby happyjack27 » Wed May 18, 2016 8:41 pm

electron injection improvement - what about cylinder magnets or stacked toroids instead of just one toroid? in any case stacked current loops.

seems this could improve the magnetic field for an electron getting in, without having too much impact on re-circulation (since re-circ would be mostly on-axis, no?). though of course it'd be more energy input. but if the output rate scales better, it may very well be worth it.

as an added bonus it would look more like a star-trek warp core. (which -- let's be realistic -- is really the main goal here.)

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Last edited by happyjack27 on Tue May 24, 2016 8:28 pm, edited 1 time in total.

hanelyp
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Joined: Fri Oct 26, 2007 8:50 pm

Re: stacked toroids for better electron injection?

Postby hanelyp » Fri May 20, 2016 3:13 am

Instead of a single current loop, a solenoid, with the electron gun inside the solenoid on axis ... could work. No need for the electron beam to deal with the convergent magnetic field going in.
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happyjack27
Posts: 1431
Joined: Wed Jul 14, 2010 5:27 pm

Re: stacked toroids for better electron injection?

Postby happyjack27 » Fri May 20, 2016 1:09 pm

hanelyp wrote:Instead of a single current loop, a solenoid, with the electron gun inside the solenoid on axis ... could work. No need for the electron beam to deal with the convergent magnetic field going in.


because a divergent magnetic field is so much better than an on-axis parallel field.

happyjack27
Posts: 1431
Joined: Wed Jul 14, 2010 5:27 pm

Re: stacked toroids for better electron injection?

Postby happyjack27 » Fri May 20, 2016 11:16 pm

I've been thinking about this, and if I'm visualizing this right, the total velocity of the electron going in when it leaves the electron source doesn't matter at all, what matters is:
A) the ratio of initial z-velocity to radial
Velocity -- dz0 / dr0
B) the initial displacement from on-axis (radial displacement) -- r0
C) how far back the electron source is from. The magrid (initial z coordinate) -- z0

So yeah, anything to improve A and B are great. C is probably already limited by other factors.

But once you set the electron off at its initial conditions, it seems there's only two ways you can effect injection efficiency from there: e-field and m-field.

And since any non-magnetically shielded conductors are out of the question due to electron losses, it's got to be m-field. And another concentric current loop seems almost deductive. You can add a charge bias to it if that's helpful.


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