Harmonic resonant fusor and the GRASER

[$oda]

Main problem of the IEC fusor are losts. There are two main types of these unberable losts: particles and radiation losts. Particles (ionts) are lost espetialy on the inner grid - we must shield it. Shielding should perhaps be magnetic, but I thing, more efective may be electrical shielding by local distortion of the E-field. it should be done by reverting polarity of grids. Of course, it is possible only in special pulsing regime: full voltage is aplied, when we havw thin cloud of ionts near outer grid, and reverted when ionts are near inner grid and have maximum velocity. Near grid, E-field is not idealy radial and ionts fall preferably into holes. Ionts then gather at the centre and few of them perhaps fuse. Ionts then expand symetricaly and when they pass trough the holes, we still have positivepolarity at the inner grid. Now it's time for polarity change, we must recycle ionts kinetic energy. Ionts are stopped near outer grid and cycle start again. Some LC cirquit should be used for energy storage - ionts are inside inner grid at full velocity, and outside are accelerated: distance betwen grids must be one half of inner grid diameter for 50% duty cycle of drivig voltage.
First problems are with iont cloud - resulting cloud at the end of cycle will be thicker due losts and E-forces. an extra energy must be added to compress it.
Yes, I'm still speaking only about ionts. And what about electrons and neutrals? It's easy to say: we must avoid it! and hard to do it. Deep, deep vacuum is needed to avoid neutrals, but electrones in grids are in exessive amounts and easily escape when grids are hit with iont, foton or heated... electrons are short cirquit in our fine balanced resonation cirquit. This is the reason why fusor with Q>1 is so hard to build...

And where is the GRASER???
Using multiple accelerator grids to shorten the iont pulse - like linear accelerator and cylindrical configuration we should optain thin and long plasma channel in axis. Some fusion reaction have reactivity peak at special energy and resulting new nuclei are excited and fission occurs immediatly. Result of that fission are several parts and energy quantum, foton, is emmited. When this excited nuclei is hit by foton of right energy, stimulated emision should occur. What a shame, we have not mirrors for gamma! Instead we need longer plasma(fusion) channel, and what more, excited nuclei must be prepared "in the fly" as the light(gamma) travels throught the channel, because they have wery short life time. When use single particles, e.g. D+, this synchronisation with travelling E wawefrom begin of the grid to end is easy. It has same velocity as light. But exessive need for precise adjustment of distances of grids makes it difficult. And for multicomponent fusion, e.g. proton-boron, which has great reactivity peak, two accelerating systems are needed. It's make it tricky to do...
Folks, I think, that other uses of fusors or cylindrical accelerators are in production neutrons, rare isotopes, GRASERs... are more efective than looking for energy production...

[guest]

Humm .. doing pulse work my self.
Reversing polarity does not buy you a thing.
In fact the density required is too high to allow reversals.
Half of the advantage of this fusor method is to have
electrons to counter balance the positively charged ions. Electrons are so much lighter than protons that
they would be lost too easily under an oscilating regeam. The ions wouldn't reasemble without electrons... do you intend to supply electrons on the downbeat?

We don't have a GRASER but some ideas on gamma emmisive prompting of neutrons.
Just ideas not equipment.
Have not thought about GRASERS in about ten years.

Larry Leins
Physics Teacher