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Status report of the LNS Superconducting Cyclotron

Rifuggiato D., Calabretta L., Cuttone G.

Nukleonika

2003

Vol. 48,suppl.2

131-134

The LNS Superconducting Cyclotron has been working in stand alone mode since the beginning of 2000, after 5 years of operation as a booster of the 15 MV Tandem. The new mode has proven to be by far more advantageous than the previous one from the point of view of operation. Working with axial injection, a quite high number of new beam types has been developed. The new mode allows for acceleration of H2 + molecules, which break into two protons when crossing a stripper in the beam line out of the cyclotron. 62 MeV protons have been used for radiotherapy since February 2002. The new mode allows to inject a more intense beam as compared to the previous mode. Therefore, an upgrading program of the cyclotron has started, aiming at having an intense extracted beam to be used as a primary beam in a facility for production of radioactive beams. Beam tests have been accomplished to evaluate transmission figures, while the upgrading of the present electrostatic deflectors has started: new deflector systems, able to dissipate high beam power and allowing for easier maintenance, have been designed and will soon be tested in the machine.

Status of the Warsaw ECR ion source and injection line

Sudlitz K., Kulczycka E., Filipiak B., Górecki A.

Nukleonika

2003

Vol. 48,suppl.2

105-108

A room temperature home built 10 GHz ECR ion source delivers beams of B, C, N, O, F, Ne, S, Ar to the Cyclotron U200-P. The same ion source has also been used for surface irradiation of the solids. To upgrade the ion source and increase the ion current in the cyclotron an oven for evaporation of solid materials has been constructed and a two gap buncher has been installed in the injection line. Some new observations on the influence of the extraction system on the ion beam current will be presented.

Ion transport from the source to first cyclotron orbit

Belmont J.

Nukleonika

2003

Vol. 48,suppl.2

13-20

The ions produced by an external source and axially injected into the cyclotron are considered. The ion beam, with a matching structure, must be carefully placed on the orbit to be accelerated and well extracted. One has to take into account its position on the first turn, its shape, its chopped time structure due to RF (radio-frequency). A compromise between different necessities must be obtained. In fact beam losses can be significant, and the ion transfer efficiency from the source to the orbit varies from a few per cent to 70%!