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您的检索式：作者名="O.Tarvainen"
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| 1 | MS-ECRIS离子源进展报告(英文)显示文摘The design of each component of the Multipurpose Superconducting ECR Ion Source(MS-ECRIS) has been completed and some items are ready.The magnets and the cryostat are under construction at ACCEL and the commissioning is scheduled for March 2007.The mechanical have been optimized and their construction is under way;the microwave system is under refurbishment and the 65kV power supply is available and upgraded for afterglow operations.Pumping and extraction system were adapted to the EIS testbench of GSI Darmstadt.The description of each part will be given in the paper along with a schedule of the forthcoming development and experiments. | G.Ciavola S.Gammino L.Celona F.Consoli G.Gallo D.Mascali S.Passarello M.Cavenago A.Galatà P.Spaedtke K.Tinschert H.Koivisto P.Suominen O.Tarvainen C.Baruè M.Lechartier R.Leroy J.P.M.Beijers S.Brandenburg H.R.Kremers D.Vanrooyen D.Kuchler D.Hitz P.Seyfert L.Schachter S.Dobrescu | 2007 | Chinese Physics C2007，31，S1： | 0 |
| 2 | 在JYFL开展的研究工作:等离子体势的测量、电子加热的模拟、JYFL-MMPS及高温炉子(英文)显示文摘Extensive plasma potential measurements have been carried out using a device developed at JYFL. In this article the main results of the measurements will be summarized.A new simulation code to study the electron heating is being developed.One objective of the code is to determine the change of the electron loss cone when the magnetic field component of the electromagnetic wave is taken into account along with the permittivity of the plasma.As a part of the work,accurate X-ray measurements have been initiated. A new plasma chamber based on the MMPS-concept(Modified MultiPole Structure)has successfully been constructed and tested with the JYFL 6.4GHz ECRIS.The results and conclusions will be presented elsewhere in these proceedings.In the same article,a new concept of ECRIS and first results will be presented.The active development work of evaporation ovens has been carried out in a joint European collaboration(ISIBHI). The objective of the task is to make the operation of the oven reliable at 2000℃for several days.Both resistively and inductively heated ovens have been studied and further developed.The status of this work will be presented. | H.Koivisto P.Frondelius T.Koponen P.Lappalainen T.Ropponen M.Savonen P.Suominen O.Tarvainen K.Tinschert G.Ciavola | 2007 | Chinese Physics C2007，31，S1： | 0 |
| 3 | 宽带微波馈入对于具有常规磁场构型的ECR离子源性能的提高显示文摘As clearly demonstrated at several laboratories,the performances of electron-cyclotron resonance (ECR)ion sources can be enhanced by increasing the physical sizes(volumes)of embedded ECR zones.En- larged ECR zones have been achieved by engineering the central magnetic field region of these sources so they are uniformly-distributed'volumes'in resonance with single-frequency rf power.Alternatively,the number of ECR surfaces in conventional minimum-B geometry sources can be increased by heating their plasmas with multiple,discrete frequency microwave radiation.Broadband rf power offers a simple,low cost and arguably more effective means for increasing the physical sizes of the ECR zones within the latter source type.In this article,theoretical arguments are made in support of the volume effect and the charge-state enhancing ef- fects of broadband microwave radiation(bandwidth:200MHz)plasma heating are demonstrated by comparing the high-charge-states of Ar ion beams,produced by powering a conventional minimum-B geometry,6.4GHz ECR ion source,equipped with a biased disk,with those produced by conventional bandwidth(bandwidth:~1.5MHz)radiation. | G.D.Alton Y.Kawai Y.Liu O.Tarvainen P.Suominen H.Koivisto | 2007 | Chinese Physics C2007，31，S1： | 0 |
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