Petteri Suominen

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The main limitation to further improve the performance of ECR ion sources is set by the magnet technology related to the multipole magnet field used for the closed minimum-B structure. The JYFL ion source group has sought different approaches to improve the strength of the minimum-B structure required for the production of highly charged ion beams. It was(More)
This paper presents a method for parameter estimation of complex chemical kinetics by an evolution strategy which uses a scheme called covariance matrix adaptation. The advantage of this scheme is that a completely derandomized self-adaptation of mutation distribution can be achieved. The used algorithm utilizes even cumulation to improve the performance.(More)
The increased requirements towards the use of higher ion beam intensities motivated us to initiate the project to improve the overall transmission of the K130 cyclotron facility. With the facility the transport efficiency decreases rapidly as a function of total beam intensity extracted from the JYFL ECR ion sources. According to statistics, the total(More)
A new x-ray photographic technique for imaging of small concentrations of iodine in tissues is presented. The method is based on the use of two x-ray beams of slightly different energies, which are obtained from the same primary source by appropriate use of critical absorbers. The beam energies are chosen so that the more energetic one is high enough to(More)
Intense heavy ion beam production with electron cyclotron resonance (ECR) ion sources is a common requirement for many of the accelerators under construction in Europe and elsewhere. An average increase of about one order of magnitude per decade in the performance of ECR ion sources was obtained up to now since the time of pioneering experiment of R. Geller(More)
The minimum-B magnetic field structure of electron cyclotron resonance ion sources (ECRIS) has conventionally been formed with a combination of solenoids and a hexapole magnet. However, minimum-B structure can also be formed with arc-shaped coils. Recently it was shown that multiply charged heavy-ions can be produced with an ECRIS based on such a structure.(More)
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