Heavy Ion Fusion At the National Labs
Posted: Mon Jun 25, 2012 4:07 pm
a discussion forum for Polywell fusion
https://talk-polywell.org/bb/
much higherRobL wrote:probably lower build costs than ITER,...
induction about 40kA accelerators have several meters long but focusing section has hundreds meters as for focusing they should propagate cesium beam through the plasma column.5-10km long beam linear accelerator
I did not read article but know some people of Princeton Lab. They are from Russia.Skipjack wrote:Joseph, if I understand the article correctly, it looks like they solved the problem and the whole system is now much more compact.
Lithium is not heavy ion. And Light Ions Fusion Program was canceled.Skipjack wrote:Joseph, they are using Lithium though, not cesium.
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LBNL has been working with two types of surface
ionization sources, contact ionizer and aluminosilicate. In
a contact ionizer, alkali atoms are continuously fed to a
heated surface, which ionizes the atoms. This type of
source routinely produces low emittance and highly
uniform beams. It also has the potential for a long
lifetime source, but since alkali metal vapor deposits can
deteriorate the high voltage property of accelerator
components, it is important to minimize the cesium
flow. In a recent experiment [3], the Cs’ beam current
from a 2-cm diameter contact ionizer was measured to be
> 15-mA/cm’ at 1145°C. In addition, the rate of the
cesium neutral current evaporation was measured to be
1.7x1014/cm2/s or equivalently 0.14 mg/cm2ihr.
NDCX-II is an induction accelerator that can handle compact pulses of some 200 billion positively charged lithium ions, shaping each pulse as it is accelerated, and making sure that almost all the ions are delivered to the target within a nanosecond.
That's mistake. Lithium beam driven experiment called "Light Ions Fusion" and was canceled due to some problems as I know. Not only read and reread the same article but also try to get information from other sources too.Skipjack wrote:NDCX-II is an induction accelerator that can handle compact pulses of some 200 billion positively charged lithium ions, shaping each pulse as it is accelerated, and making sure that almost all the ions are delivered to the target within a nanosecond.
http://hifweb.lbl.gov/public/BeamHEDP2010/NDCX-II.htmlNDCX-II will accelerate a beam of 30–50 nC of Li+ ions to 1.5–4 MeV and compress it into a pulse around 1 ns long.
http://escholarship.org/uc/item/51x361vnIon species: Li+
How many do you want?Li+ ions
Sorry, it's my mistake as I thought that we told about what kind of ions will be used in final reactor while NDCX-II is a "Neutralized Drift Compression eXperiment" and is only intermediate stage for checking viability of proposed focusing principle. And any type of ions is usable for this purpose. I think they simply used an existing ions source in experiment. But common principle is to use alkali metals +1 ions for acceleration and Cesium will be used in real experiment if all preliminary studies will be successful. As Z=3 for Lithium and that is "light", while for Cs Z=55 and that is quite "heavy".Skipjack wrote:http://cerncourier.com/cws/article/cern/40998http://hifweb.lbl.gov/public/BeamHEDP2010/NDCX-II.htmlNDCX-II will accelerate a beam of 30–50 nC of Li+ ions to 1.5–4 MeV and compress it into a pulse around 1 ns long.http://escholarship.org/uc/item/51x361vnIon species: Li+How many do you want?Li+ ions