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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Home brew linear accelerator?
References: <3D8B60B3.1090107@BOGUS.earthlink.net> <3D8CB57B.6040800@BOGUS.earthlink.net> <3D8CF776.204@BOGUS.earthlink.net>
Date: Sun, 22 Sep 2002 13:08:30 GMT
NNTP-Posting-Date: Sun, 22 Sep 2002 06:08:30 PDT
Chris Carlen wrote:
> Dirk Bruere wrote:
> > So, get another block and hit it with protons. Or, if that lacks
> > penetration, positrons.
> > Then you have two plastic blocks of charge.
> > Keep well apart.
> > Dirk
> Hmm, I wonder how to make a proton beam, or positron beam for that
> matter? Must be that anything other than electrons can't be obtained in
> milliamp rates like good 'ole e-.
> How do they get heavy ions for that matter in sizeable quantities? I'll
> wager a guess: Take a high flux X-ray or gamma source, and pass it
> orthogonally through a beam of neutral atoms (easy to make). Have a
> short segment of linear accelerator with negative accelerating potential
> located near the intersection point. The atoms will get many of their
> electrons excited away by the ionizing source, and the positive ions
> will get swept into the accelerator.
> Is this anything like what is really done?
> Bet it would be fun to let a block of electrons and positrons get it on
There is quite a bit of information on the web giving details about how
these things work and there are books as well. The Bevatron proton
synchrotron, which is long retired but I knew it intimately, used a
palladium leak as a source of hydrogen. The hydrogen from the palladium
leak entered the vacuum chamber where there was an intense electron
beam. Protons accelerated toward the negative source of the electrons
but mostly escaped through a hole. The proton beam was about 450ma at
this point as I remember. The proton source was located at the top of a
450,000 volt cockroft-walton. The protons then entered a 10MeV Linac.
Injection into the 6.4 GeV Bevatron proton synchrotron was done at near
minimum magnetic field but as the field was rising. The Bevatron had a
single accelerating electrode in one of the four straight sections of
the vacuum tube (which was about 8 feet wide, high enough to crawl
through - I crawled in once to do some repairs - and over 100 feet in
diameter). Although experiments could be done with internal targets, the
Bevatron had an external proton beam extracted by plunging an
electromagnet into the beam path. An electrostatic beam extractor was
also available but I don't recall it being used when I was working at
the lab. A machine of that size creates a lot of bremstrahlung radiation
and the whole thing was shielded with huge concrete blocks made with
heavy agregate. The external beam path was also shielded. Experimenters
huts were lined up along the external beam path. Of course, this was not
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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