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KN Van de Graaff Accelerator

Latest News

* The installation of a new accelerator has begun in October. The new vertical accelerator will be housed inside a new 40-foot-tall tower located above the existing NSL in the center of Nieuwland. Construction will continue on this project for the next few months. Details

* In 2011, the old KN accelerator has ceased operations. It will be replaced by a new accelerator.
Click here to view the tank being removed by a large crane through the roof of the laboratory in July.

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The Nuclear Science Laboratory at the University of Notre Dame maintains and operates a model KN accelerator from High Voltage Engineering which was originally located at Queens University in Kingston, Ontario. When funding for this machine at Queens University was discontinued, the machine was donated to our laboratory and was moved to our facility in 1995. The picture below shows the KN closed and ready for operation. The KN is primarily used for Nuclear Astrophysics research but has also been used for other experiments including material analysis. The KN and JN accelerators share the same switching magnet which allows experimenters to use either machine without changing the setup. The KN will soon be replaced by a new accelerator and will cease operations in its current location at the end of 2010.

Unlike the FN accelerator, the KN is a single ended Van de Graaff accelerator whose RF ion source is located inside the terminal shell. While this makes servicing the ion source more difficult since it requires a tank opening, this allows for significantly higher beam intensities which are often required for Nuclear Astrophysics research. The KN is currently using original high voltage engineering charging belts.

Machine Parameters

  •  Terminal voltage up to 4 MV (good transmission between 600kV and 4MV)
  •  RF-Ion source (typically hydrogen or helium beams)
  •  Beam current up to 150 micro A

Existing Beam Lines and Equipment

  •  0o Beam line for low energy (p,gamma) and (alpha,gamma) cross section measurements for stellar H and He burning.
  •  30o Beam line for RHINO Gas Target System
  •  45o Beam line to Material Analysis including RBS and PIXE

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Data Acquisition

  •  A 8 Channel MPA-3 System from FAST Comtec is used for the majority of KN/JN runs.

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