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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Useful, thanks.
Incidentally a "Poor mans particle accelerator" can be made using He gas as the mean free path is quite long compared with air and a combination of He-Ar can get reasonable results. See plasma globes! You can certainly get multipaction with He but it would be more of a glow discharge than true collisions. See Sam's FAQ.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
@ Father Dest
I don't know very much about FFAG focusing. I never seriously looked into it, partly because I thought that the fabrication of magnetic pole pieces would be a show-stopper, considering my limited resources.
As I see it, it would probably be easier for me to make a small RF linear accelerator than any type of circular accelerator.
Anyway, I'll post one or two more ideas about this subject one of these days soon.
@ Conundrum
I'm not sure exactly what you're getting at regarding the use of helium.
have been reading/searching japanese papers last week - surprised that their english level is so low, and that weren't just some forum messages on the internets - that's official papers, like this one for example -
Proceedings of the 3rd Annual Meeting of Particle Accelerator Society of Japan And the 31th Linear Accelerator Meeting in Japan (August 2-4, 2006, Sendai Japan)
Abstract The main bending and quadrupole magnets in J-PARC 3GeV Synchrotron (RCS) that is controlled on rapid repetition of 25Hz excited follow the sine waveform. To realize of operation it, the magnet power supply was adopted of resonance type. Characteristic of resonance type power supply control, input response is not quickly because it transitional operation is very slow. On the other hands, the control must be slow continuous action to stabilize resonance balance.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
For anyone interested in this subject, I recently found the following interesting paper by G. Dolbilov et al. This paper concerns a variant of the "Multibeam accelerator" where the high voltage is produced by a coaxial helical quarter wave resonator, apparently driven on the input side by an AC signal of a few kilovolts @ 100 kHz, rather than by an external primary winding. This way the housing can be made of metal. (I wonder if an external coil or magnet could be used to create magnetic insulation allowing for a higher output voltage without increasing the diameter)?
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particle accelerators
