[Professor Mega-Mind (OP)]

..........Plasma-Cannon Engine
The design has an earlier , more  practical version ; the "Plasma-Cannon" form .  With this version , a proton-electron plasma is injected into the base of a powerful HEX-ray cannon .  The electrons are accelerated to relativistic velocities momentarily , but then decelerate , as the powerful electro-magnetic force drags the heavy protons along with the light-weight electrons .  If the ejected plasma hits a reciever , within a closed system , and is recycled , it forms a reactionless drive .  If the plasma is ejected to space , or is spent in an open system , it forms a reaction drive .  If the stream is focused onto an outside target , then it is a weapon .  When the plasma-stream impacts a cold target , the ions will re-combine .  This will release a tremendous amount of heat energy , thus justifying the name "Phaser" , or Phase-change laser .
Okay !  Inverted phaser equals RD .
Professor Megamind

[Bored chemist]

This is an actual , practical , form of the Compton Effect-type of engines . 
Mount a dense-plasma container (X-ray transparent)

So "practical" that it starts with unobtanium.

These should generate strong shockwaves , which hit the pad & wall as hammer blows .

Yes, it will create a shockwave.
And,as I keep pointing out (and you keep trying to ignore) the shockwave will spread out in all directions.
It will hammer the tank equally in all directions.
The net force will be practically zero (apart from photon pressure).

THAT is the first working Reactionless Drive !

No.
It's not even a credible start on the way to one.

If the ejected plasma hits a reciever , within a closed system , and is recycled , it ...

... produces no net force..

thus justifying the name "Phaser" , or Phase-change laser .

OK, so that shows that you don't know what a laser is...
No shock there.

Nobody has seen anything except you posting gibberish.

[Professor Mega-Mind (OP)]

..............Rabbit/Hat/Grin !
Ever hear of a water-hammer ? Well ; "Today is a day , of days !" for plumbers !
As for "Phaser" , it's an acronym , not an official designation .
Lastly , I've never seen an X-ray machine experience recoil yet !
P.M.

[Bored chemist]

Ever hear of a water-hammer ?

Yes.
I heard of it.
I also heard it.
 And I was not inside a water pipe.

So, you have provided  supporting evidence for my point of view.

Like "water hammer" the shockwave moves out in all directions .

[Bored chemist]

Lastly , I've never seen an X-ray machine experience recoil yet !

Yes, I doubt anyone has.
 That's because the recoil is tiny.

The recoil force (which we seem to agree is tiny) is the only force available to your "reactionless drive".
That's fine- your drive's size is't what's important- but you need to remember that that tiny force isn't reactionless.

[Professor Mega-Mind (OP)]

..............Compton Effect.
Like a spring unloading , the HEX-ray photons unload their internally-  stored energy into the point-particle electrons .  These instantly  accelerate to relativistic velocities , packing a kinetic punch that the photons NEVER could !  Striking the dense-plasma container all at once , they produce a powerful shockwave , which propagates through the container , and strikes the lightly-padded wall . The effect  is that of a giant hammer-blow to the wall .  A continuous series of these would produce a steady thrust against the wall .
Like a water-hammer , these shock-waves would propagate down-stream only , unless reflected backwards .  The thin-mat behind the plasma-container absorbs the shockwaves by way of inelastic collisions .  There are no reflections .
Well , well !  No-recoil versus very powerful shockwave .  Doesn't seem fair to me !
P.M.

Note-Conceptually , this is very similar to the "Orion" spaceship-drive concept .  It's practicality was debatable , but it's efficacy was not .

[Bored chemist]

And, once again...

they produce a powerful shockwave , which propagates through the container ,

in all directions and this has a negligible net thrust.

It doesn't matter how many  times you pretend otherwise.
The shock- like water hammer- spreads in all directions and produces no net thrust.

[Bored chemist]

As for "Phaser" , it's an acronym

What does it stand for?

[Professor Mega-Mind (OP)]

.....................Phaser
Short for :
 Phase-changing laser-like beam .
P.M.

[Bored chemist]

.....................Phaser
Short for :
 Phase-changing laser-like beam .
P.M.

acronym
/ˈakrənɪm/Submit
noun
an abbreviation formed from the initial letters of other words and pronounced as a word (e.g. ASCII, NASA ).

[Professor Mega-Mind (OP)]

You can change it to "Informal Short Name" , if that makes you happy .  Even "common name , or nick-name" , could suffice .  Matters not to me .
P.M.

[Bored chemist]

When the plasma-stream impacts a cold target , the ions will re-combine .  This will release a tremendous amount of heat energy

Which, as pointed out before, will spill out in every direction.
So, it's not a beam.
Why make up a name that sounds like laser for something that has no obvious link to one?

[Professor Mega-Mind (OP)]

...................Morphology
An extremely high velocity , glowing-hot plasma-stream , analogous to a radical garden-hose .  This will bear some resemblance to a laser-beam , in a vapor cloud .
D.H.

[Bored chemist]

analogous to a radical garden-hose

It isn't a stream.

It bursts out spherically in all directions (which is why it produces no net thrust)
Do you not understand this?