PhD-ceremony Mr. A. Sen: Heavy ion beam transmission in the AGOR cyclotron

PhD-ceremony: Mr. A. Sen, 16.15 uur, Academiegebouw, Broerstraat 5, Groningen

Dissertation: Heavy ion beam transmission in the AGOR cyclotron

Promotor(s): prof. S. Brandenburg

Faculty: Mathematics and Natural Sciences

In the framework of the TRIµ P program initiated at the KVI in 2002, the AGOR cyclotron was used to accelerate low energy heavy ion beams up to a beam intensity (³10¹² particles per second ) .

Typical beam ions are ²⁰⁶Pb accelerated to 8 MeV/amu and ²⁰Ne accelerated to 25 MeV/amu. In the course of beam development for the experiments we observed that vacuum induced beam loss (and the subsequent feedback loop between beam intensity and vacuum degradation) reduces the achievable beam intensity is a limiting factor in delivering these beams. The aim of the work presented in this thesis is to study the contributing factors to the beam loss mechanism especially the feedback loop and investigate possible methods of mitigation.