Diy linear accelerator

[Sarmad suseyn]

Hi guys
Full curfew is killing me. Have nothing to do.
So i decided to do any project . Dont kill me for that.
A very simple linear accelerator just for testing
I used 15kv ac and 750 v dc powers supplies .
The result wat interesting but i need more ac voltage and bigger housing in the future. Got 276 counts = 1.25usv/h
Which is not bad . But it could be better with more voltage and vacuum.
Any ideas to improve?

[Richard Hull]

Cool, simple design. The spacing and length of the drift tubes is a critical function of the frequency if the design is to be successful in the fullest sense of the hoped for result. Otherwise, it is just an x-ray system.

Richard Hull

[Rich Feldman]

Very cool looking. Thank you for jumping into fabrication, and photography, and reporting.

Is it ordinary air inside? Partial vacuum? What pressure?

Your description is missing important circuit details, like the external connection between HV AC and the other two power sources.
Schematic diagram is one way to present those connections.

Your measurement, maybe attributed to penetrating radiation, is meaningless without a control reading.
Not by turning off the accelerator tube, but by blocking the purported beam with a piece of lead or something.
So we know what fraction of the 276 CPM are due to HV circuit interfering with the detector operation.

How do the measurements respond to changes in your electric power variables? Or to presence of a strong magnet?

[Sarmad suseyn]

Hi
No the vacuum is there of course. I think its one stage vacuum pump. The vacuum around -30 psi .
Im using 3 power suppliers two connected and one is not, check attached pic.
In the first i thought its electrical interference from the high voltage. This why i checked the tube with Geiger counter before and after putting the electron gun on. So its not electrical interference. Dont forget the outer shell is a thick pvc pipe for high pressure water. About xrays im not sure right now. I just ordered ludlum scaler 2200 with NI probe ( in the way) Then i will check its xray or not.
The drift tubes are different in length its important.
This just an experiment. And my aim is not to speed electrons
But its for bigger atoms like hydrogen or protons.
I want it more bigger and more power
It means more vacuum more voltage bigger drift tubes and more hv frequencies

[Rich Feldman]

Thank you.

By more vacuum, do you mean stronger than -30 psi?

If the HV AC power supply is not battery powered, it must have more than two terminals.
How are the other terminals (power input and ground?) connected to the inputs or outputs of the other power supplies? It matters!

What is the frequency of HV AC, and how is that related to the length of parts in your tube design?

[Sarmad suseyn]

Hi rich
I feel i need more vacuum power for example 2 stage vacuum
The more bigger the linear the more frequency it requires
Not khz but mhz.
The bower Ac powder supply im using between 21-24 khz
The dc hv Module is from 400v to 1000 v
It's a neon transformer.
It has 2 leads only not 3.
Regarding drift tubes im attaching pdf.

[Maciek Szymanski]

Here you are an article about one of the first drift tube liniacs (when they were just couple of laboratory glassware, coper wires and shellac seals) "The production of high speed canal rays without the use of high voltages" by E.O.Lawrence and D.H.Sloan. With this desktop setup they got ion energies in 100keV range:

https://www.dropbox.com/s/f1fq4w0h7v0zb ... s.pdf?dl=0

[Sarmad suseyn]

That was a joke right ? No files......no comment

[Maciek Szymanski]

Sorry, I’ve made a mistake in the link. It should work now.

[Sarmad suseyn]

Hi
If you noticed but there is hv !!!!
The design similar to what i built.!