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- 저자 : Schweizer, Stefan L. (검색결과 16 건)
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Technical design of an IH-type buncher for KoBRA at RAON
Hoeltermann H.,Ratzinger U.,Schweizer W.,Strehl D.,Schwarz M.,Haehnel H.,Tshoo Kyoungho,Ham C.,Kwak D.,Shin T. S.,Yoon D. 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.8
To satisfy the beam requirement of the KoBRA experiment (0.5 nsec in 1σ), rebunching is required in the energy range up to 15 A MeV and for particles with an A/q range from 1 to 7. In cooperation with IBS and Hanmac Corporation, BEVATECH proposed a five-gap IH-buncher cavity which has excellent bunching properties from 5 to 15 MeV/u. Main challenges in this project are the wide energy range and CW operation at RF power levels up to 20 kW. The cavity will offer an effective voltage amplitude of up to 1 MV. To provide the required cooling channels and cooling efficiency, the stems and drifttubes of this cavity will be 3D printed. This paper will discuss the technical design approach and give a status on the development of the buncher cavity.
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Mason, A.W.,Schweizer, Andreas North-Holland Pub. Co 2006 Journal of pure and applied algebra Vol.205 No.1
<P><B>Abstract</B></P><P>Let <I>K</I> be an algebraic function field of one variable with constant field k and let C be the Dedekind domain consisting of all those elements of <I>K</I> which are integral outside a fixed place ∞ of <I>K</I>. We introduce “non-standard” automorphisms of the group <SUB><I>SL</I>2</SUB>(C), generalizing a result of Reiner for the special case <SUB><I>SL</I>2</SUB>(k[t]). For the (arithmetic) case where k is finite, we use these to transform congruence subgroups into non-congruence subgroups of almost any level. This enables us to investigate the existence, number, and minimal index of non-congruence subgroups of prescribed level. We provide also a group-theoretic characterization of those <SUB><I>SL</I>2</SUB>(C) where C is a principal ideal domain.</P>
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Comparison of 2- and 3-level Active Filters with Enhanced Bridge-Leg Loss Distribution
Thiago B. Soeiro,Mario Schweizer,Jorgen Linner,Per Ranstad,Johann W. Kolar 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In this paper an efficiency comparison between 3-phase shunt active filters derived from the 2-level VSC, the 3-level NPC, Active NPC (A-NPC) and the T-type VSC is presented. In order to address the loss distribution issue of the 3-level topologies, while keeping the efficiency of the system high, a space vector modulation scheme incorporating a special clamping of the phase is proposed. It is shown that 3-level active filters can have their losses well distributed over the chip dies, leading to only a small difference in their operating temperatures. Additionally, a semiconductor area based comparison is used to further evaluate the studied active filter systems. Finally, experimental results obtained with a 12kVAr/48㎑ 3-level NPC based shunt active filter employing custom SiC power modules are presented in order to demonstrate the performance and feasibility of this solution.
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