Cyclotron II

Posted on Feb 4, 2014

The white feedthroughs are for the attachment of the RF high voltage to the D`s (not shown). The copper pipe normal to the pipe is the vacuum line. The D`s have screw posts on the side for attachment to the RF power supply leads (curled copper wire). You can clearly see the target in the upper left hand corner of the picture. The light is bouncing off of the surface nicely.

Cyclotron II
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The target was hard soldered on and de-fluxed and cleaned before each experiment. Copper was chosen for the target metal for thermal reasons, and the possibility of making short-lived low energy isotopes over longer-lived isotopes from different target materials. The heater element in the center of the chamber is the ion source for the cyclotron. The D`s are shown in their proper place. At the bottom of the picture, you can see the plate where the accelerated ions hit. The feedthroughs were attached using vacuum wax. The chamber walls are made of stainless steel. The D`s are made of brass. The heater is nichrome wire, and the current through the heater shown is about 2. 5A. This is what the project looked like when it was setup at the science fair. That is me standing next to it (senior year). The project was somewhat imposing. It exactly filled the space allotted. It was about 8` by 4` by 3`, I seem to remember. The black background with text outlined in yellow became a pretty often mimicked style. I guess I became somewhat of a science fair trendsetter. On the right is the cyclotron chamber while I was cleaning the Ds off for the next experiment. The bottle in the foreground is the solvent I used the clean the brass off (xylene and acetone). This is the cyclotron during the outgassing phase. The chamber needed to be outgassed because the air molecules trapped on the surface of the brass would act as a slow leak, causing...

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