Status of the ATLAS PIIECR ion source project Page: 3 of 13
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increased radius are improved pumping in the second stage and radiaL access
into the second stage.
The important issue which must be addressed in changing to the Nd-Fe
material is the fact that the Curie temperature is 300°C. This value is less
than half that of SmCog and therefore more care must be exercised in designing
the water cooling jacket. Our present plan calls for a continuous sheet of
cooling fluid to separate the hexapole assembly from the plasma vacuum
chamber. This feature and the general cross-section of the inner region of
the source are shown in Figure 3.
IV. Vacuum Chamber and Pumping: The plan for the vacuum chamber is
shown in both Figures 1 and 3. The first stage of the ECRIS will be mounted
on a flange which will contain vacuum pumping for the first stage. The design
is intended to allow one to easily change the first stage design. In addition
to variations in first stage design for ECR-type operation, it is possible to
conceive of other types of ions sources as the first stage which are then
followed by the stripping of the ions in the second stage.
The pressure profile expected to be achieved in the various regions
depend on two stages of differential pumping between the first and second
stage. A total of three vacuum pumps are planned for the source. Because of
space limitations and power consumption limits on the high voltage platform,
the present plan is to use turbo-molecular pumps of 1000 1/s capacity. The
extraction region will be made as porous as possible to enhance pumping. As
calculated, it appears that a pressure of 10“3 torr in the inner region of the
first stage will result in a pressure of 10”^ torr in the second stage central
region. Under these conditions, the gas usage rate would be approximately 3
mg/hr for nitrogen.
V. Extraction Region and near optics: Calculations are underway
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Pardo, R.; Minehara, E.; Lynch, F.; Billquist, P.; Evans, W.; Clifft, B. E. et al. Status of the ATLAS PIIECR ion source project, article, January 1, 1986; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1070489/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.