Fusion Message Board

In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.

Subject: Re: Cylindrical IEC
Date: Jan 08, 6:06 pm
Poster: Jim Lux

On Jan 08, 6:06 pm, Jim Lux wrote:

>I can tell you (and it is documented in my master's thesis as well), that the maximum neutron output obtained from one version of the cylindrical IEC device was on the order of
>2.0e+5 n/s, at voltage of about 30 kV, and a
>measured electrode current of about 40 mA. The operating pressure was on the order of 1 milliTorr
>of deuterium. It is possible that one could obtain much higher rates by boosting both the
>operating voltage and the current. One could
>also make changes with electrode geometry,
>sizing, and spacing to help improve the confinement of fusion fuel ions.
>To call the U of I device a "cylindrical" IEC device is somewhat misleading. I prefer to call it an axial-cylindrical IEC device because
>there are a number of cylindrical hollow ring
>electrodes that are spaced axially apart and
>biased at different voltages. It is thought

Blair, many thanks.. I found a copy of the paper that you, Luis Chacon, and George Miley wrote which describes some of your modelling and data ("Prospects of the Cylindrical....")

What is the diameter of the cylinder? The sketch in Fig 1 is obviously not to scale (because 36 cm (AK) and 15 cm (K) look about the same).

I assume the dotted lines in that drawing are just for illustration, and don't represent grids across the cylinder?

Are the cylinders at the chamber wall, or "hanging out in space"? It would seem that this would make a difference for the number of ions lost to wall impacts. What sort of construction did you use to put this together? A stack of aluminum and ceramic or glass tubes of some sort?

Is your thesis published anywhere?