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17:06
1.08.2023

Megavolt continues a line of accelerators for standard 4.5 mm bb balls - this time he has completed the ЩУМ-72 model in the form of a compact pistol of low power. It is included into the Accelerator Table  and, according to the results of the calculation, has a record quality coefficient: G = 55.1% ! This is the maximum value achieved for gauss guns with thyristor switching, only the DB6L half-bridge recovery coilgun is ahead.

In general, there are already twenty accelerators in the Table, apparently in the near future I will do another analysis and summarizing statistics...

 

 

Views: 171 | Added by: Eugen | Tags: reluctance accelerator, Multistage, coilgun, Velocity, Launcher, gauss gun, Speed, gaussgun | Rating: 5.0/1
Total comments: 11
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1 tokamakerr • 06:23, 18.09.2023
https://twitter.com/tokamake1/status/1703607324508836259
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2 Eugen • 23:55, 18.09.2023
Hey ! May we know more about your accelerators?
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3 tokamakerr • 06:54, 19.09.2023
Sure,what information would you like to know? Maybe i will post a video on Youtube
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4 Eugen • 13:50, 19.09.2023
Unfortunately, I haven't got Twitter. It would be great if you make such publication on Youtube. 
To include Your accelerator to the Accelerator table, following parameters are needed:
1) Energy spent for a shot;
2) Projectile speed;
3) Total length of acceleration (sum of all coils , but without detectors, loading system etc);
4) Inner diameter of the coils.
Any other parameters you suggest to be important.

And surely the outlook of your model!
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5 tokamakerr • 06:39, 28.09.2023
https://youtu.be/dGo10wL4HZw
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6 Eugen • 11:11, 28.09.2023
Perfect! 250J X 2 = 500, it means you've got 500 W converter - cool. Efficiency is also incredible - don't you use halfbridge recuperative circuit?
Could you inform aboult esle 2 parameters: outer bore diameter (e.g .inner coil dia), and total length of accelerating coils (or individual coil length + number of coils). Thank you ! Congratulations with new achievements in Guass-technology!
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7 tokamakerr • 13:01, 28.09.2023
Yes, my own DIY push-pull resonant booster。Amorphous materials are used to make transformers. It is charged by constant current and the peak power is over 1kw。
The transmitter circuit uses a boost-like structure, similar to the circuit on page 17 of your article (link below), and I improved it.
http://coilgun.ucoz.com/publ/theoretical_papers/coilgun_calculations/investigation_of_the_recovery_efficiency_in_a_halfbridge_electromagnetic_accelerator/7-1-0-7
I use 304 stainless steel pipe with an inner diameter of 8.1mm and an outer diameter of 8.5mm. Wrap it with a layer of tape and wrap coils around the outside.
A single coil is 15mm long, there are 14 coils in total, and a 1mm PCB is used between each coil to provide support.
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8 Eugen • 13:19, 28.09.2023
Thanks for you answer, very interesting information! I will use for calculations an inner coil dia 8.6 mm and total acceleration length 21 cm then. Next week I'm going to perform all math and add you model to the list. It promises to be a record!
Can I take a snapshot from your video or You may send me a photo or the device ?
There is one strange thing - you write that 250 J are spent for a shot, but that is all energy in caps - 3050 mkFx410V. It is unobvious for transistor-driven circuits, usually a lot of energy stays in caps (up to half of it) after a shot....
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9 tokamakerr • 13:26, 28.09.2023
I designed it so that the energy of each capacitor is used up as much as possible, and the coil recycles energy to the next level of capacitor. I have measured the remaining energy after launch, and it is less than 10j.
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10 Eugen • 13:52, 28.09.2023
Very impressive technical solution! Thank you
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11 Eugen • 14:05, 03.10.2023
I've made all math about your coilgun and obtained G-factor (http://coilgun.ucoz.com/publ/theoretical_papers/coilgun_calculations/table_of_accelerators/7-1-0-29) as much as 51% ! This is the best result for cylindrical -projectile accelerators (excluding Dantist's DB-6L with its travelling wave configuration). Today going to add it to the Accelerator table. Great result, congratulations once more!
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