Zobrazeno 1 - 10
of 802
pro vyhledávání: '"Koivisto H"'
Publikováno v:
EPJ Web of Conferences, Vol 149, p 01003 (2017)
Externí odkaz:
https://doaj.org/article/f2d6a2aaf7a84443a0834fa3407b88f2
Publikováno v:
In Nuclear Inst. and Methods in Physics Research, A May 2024 1062
Autor:
Angot, J., Luntinen, M., Kalvas, T., Koivisto, H., Kronholm, R., Maunoury, L., Tarvainen, O., Thuillier, T., Toivanen, V.
A new method for determining plasma parameters from beam current transients resulting from short pulse 1+ injection into a Charge Breeder Electron Cyclotron Resonance Ion Source (CB-ECRIS) has been developed. The proposed method relies on few assumpt
Externí odkaz:
http://arxiv.org/abs/2103.03546
Autor:
Skalyga, V. A., Izotov, I. V., Shalashov, A. G., Gospodchikov, E. D., Kiseleva, E. M., Tarvainen, O., Koivisto, H., Toivanen, V.
Fundamental studies of excitation and non-linear evolution of kinetic instabilities of strongly nonequlibrium hot plasmas confined in open magnetic traps suggest new opportunities for fine-tuning of conventional electron cyclotron resonance (ECR) ion
Externí odkaz:
http://arxiv.org/abs/2011.10416
Autor:
Tarvainen, O., Kronholm, R., Laitinen, M., Reponen, M., Julin, J., Toivanen, V., Napari, M., Marttinen, M., Faircloth, D., Koivisto, H., Sajavaara, T.
The production of negative ions in cesium sputter ion sources is generally considered to be a pure surface process. It has been recently proposed that ion pair production could explain the higher-than-expected beam currents extracted from these ion s
Externí odkaz:
http://arxiv.org/abs/2007.00521
Publikováno v:
JINST 15 P06016 (2020)
This paper presents a simulation study of a permanent magnet electron cyclotron resonance ion source (ECRIS) with a minimum-B quadrupole magnetic field topology. The magnetic field is made to conform to conventional ECRIS with $B_\textrm{min}/B_\text
Externí odkaz:
http://arxiv.org/abs/2004.09917
Autor:
Izotov, I. V., Shalashov, A. G., Skalyga, V. A., Gospodchikov, E. D., Tarvainen, O., Mironov, V. E., Koivisto, H., Kronholm, R., Toivanen, V., Bhaskar, B.
The measurement of the axially lost electron energy distribution escaping from a minimum-B electron cyclotron resonance ion source in the range of 4-800 keV is reported. The experiments have revealed the existence of a hump at 150-300 keV energy, con
Externí odkaz:
http://arxiv.org/abs/1912.04285
Autor:
Komppula, J., Tarvainen, O., Kalvas, T., Koivisto, H., Kronholm, R., Laulainen, J., Myllyperkiö, P.
Absolute values of VUV-emission of a 2.45 GHz microwave-driven hydrogen discharge are reported. The measurements were performed with a robust and straightforward method based on a photodiode and optical filters. It was found that the volumetric photo
Externí odkaz:
http://arxiv.org/abs/1510.02246
Negative ion production with conventional multicusp plasma chambers utilizing 2.45 GHz microwave heating is demonstrated. The experimental results were obtained with the multicusp plasma chambers and extraction systems of the RFdriven RADIS ion sourc
Externí odkaz:
http://arxiv.org/abs/1503.08061
Photoelectron emission measurements have been performed using a filament-driven multi-cusp arc discharge volume production H^- ion source (LIISA). It has been found that photoelectron currents obtained with Al, Cu, Mo, Ta and stainless steel (SAE 304
Externí odkaz:
http://arxiv.org/abs/1503.08074