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AbstractAbstract
[en] Spherical cavities resonating on a high g radial order mode are considered. The ratio of the maximum magnetic field inside the cavity to the maximum field on the wall is proportional to g. The proportion coefficient is given for the TEsub(g10); TEsub(g20), TMsub(g10), and TMsub(g20) modes. That corresponds to an energy concentration at the center. Owing to this property the superconducting cavities might be used to produce strong H.F. magnetic fields (larger than 10 Teslas)
[fr]
On considere des cavites spheriques resonnant sur un mode d'ordre radial g eleve. Le rapport du champ magnetique maximum a l'interieur de la cavite au champ maximum sur la paroi est proportionnel a g. La valeur du coefficient de proportionnalite est donnee pour les modes TEsub(g10), TEsub(g20), TMsub(g10), TMsub(g20). Cela correspond a une concentration de l'energie au centre. De par cette propriete les cavites supraconductrices pourraient etre un moyen de produire des inductions magnetiques H.F. elevees, superieures a 10 TeslasOriginal Title
Interet des modes d'ordre radial eleve dans les cavites supraconductrices spheriques
Primary Subject
Source
Apr 1975; 34 p
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Report
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Szecsi, L.; Friedburg, H.
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.); Deutsches Patentamt, Muenchen (Germany, F.R.)
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.); Deutsches Patentamt, Muenchen (Germany, F.R.)
AbstractAbstract
[en] The cavity resonator is designed axially symmetrical with respect to the beam axis. It consists of two end pieces being composed of two plate-shaped half shells and welded together at the outer border and at the inner opening for the radiation passage. Both end pieces are connected by means of pipes forming a cylindrical structure with interrupted side walls. Through the end pieces and the pipes there may be passed a coolant, especially helium if a niobium material for superconduction is used. The surfaces of the end pieces and the pipes are chemically or electrochemically refined. (DG)
[de]
Der Hohlraumresonator ist rotationssymmetrisch zur Strahlenachse aufgebaut. Er besteht aus zwei Endstuecken, die aus jeweils zwei tellerfoermigen Halbschalen bestehen und am Aussenrand sowie an der Innenoeffnung fuer den Strahldurchgang miteinander verschweisst sind. Beide Endstuecke sind mittels Rohren verbunden, so dass eine zylinderfoermige Struktur mit durchbrochenen Seitenwaenden entsteht. Durch die Endstuecke und die Rohre kann Kuehlmittel, insbesondere Helium bei Verwendung von Niobmaterial fuer Supraleitung, hindurchgefuehrt werden. Die Oberflaechen der Endstuecke und der Rohre sind chemisch oder elektrochemisch verguetet. (DG)Original Title
Hochfrequenz-Hohlraumresonator
Primary Subject
Secondary Subject
Source
7 Sep 1978; 4 p; DE PATENT DOCUMENT 2630310/C/
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Patent
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Halbritter, J.
Kernforschungszentrum Karlsruhe (F.R. Germany). Inst. fuer Experimentelle Kernphysik
Kernforschungszentrum Karlsruhe (F.R. Germany). Inst. fuer Experimentelle Kernphysik
AbstractAbstract
[en] Rf modes with large longitudinal electric fields (div E vector unequal to 0) at the cavity wall systematically show worse rf properties than modes with div E vector identical with 0; e.g. enlarged rf residual losses. While magnetic residual losses R sub(res) proportional f2 are due to uncharged inhomogeneities in the oxide coating the metal, the electric residual losses R sub(orthogonal) occur via charged states in the oxide: the recharging of those states by tunnel exchange causes excitation across the energy gap of the superconductor yielding residual losses at high rf field strengths. The interaction of E sub(orthogonal) with the charges generate (longitudinal) phonons showing up as contribution to R sub(orthogonal). The resulting R sub(orthogonal) increases with E sub(orthogonal) and is nearly independent of frequency f, indicating the importance of R sub(orthogonal) for low frequency sc cavities, especially at high field strengths. In addition R sub(orthogonal) can account for the observed large residual losses of strip line modes in narrow junctions and joints between superconductors. (orig.)
[de]
Es ist bekannt, dass Hochfrequenzmoden mit elektrischen Feldkomponenten E sub(orthogonal) senkrecht zu Resonatoroberflaechen groessere Hf-Restverluste zeigen als Moden mit E sub(orthogonal) identisch 0. Waehrend die magnetischen Restverluste R sub(res) durch ungeladene Zustaende im Oxyd nahe (< 2 mm) der Metalloberflaeche verursacht werden, werden elektrische Restverluste R sub(orthogonal) durch geladene Zustaende verursacht, die sich hauptsaechlich weiter weg (ungefaehr gleich 4 mm) vom Metall befinden. Die R sub(orthogonal) verursachenden Mechanismen sind: Bei grossen E sub(orthogonal) werden Elektronen ueber die Energieluecke angeregt; Kopplung Hf-longitudinale Phononen. Im Gegensatz zu R sub(res) (H sub(parallel),f) proportional f2, ist R sub(orthogonal)(E sub(orthogonal),f) proportional c(E sub(orthogonal)) nur wenig von der Frequenz abhaengig und mit E sub(orthogonal) ansteigend. Daher ist in supraleitenden Resonatoren R sub(orthogonal) insbesondere fuer niedrige Frequenzen (f < GHz) und hohe Feldstaerken wichtig. Durch diese elektrischen Hf-Restverluste R sub(orthogonal) koennen auch die grossen Restverluste erklaert werden, die Strip-linemoden in engen Metall-Oxyd-Metall-Kontakten haben. (orig.)Primary Subject
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Feb 1976; 18 p; 2 figs.; 1 tab.; 33 refs.; with app.
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AbstractAbstract
No abstract available
Source
Brief item.
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Journal Article
Journal
Cryogenics; ISSN 0011-2275; 
; v. 18(7); p. 447
; v. 18(7); p. 447
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AbstractAbstract
[en] During the past few years, considerable experience has been gained in the operation of prototype superconducting accelerators under beam line conditions. As a result of this experience, important aspects of structure design and important questions related to the long term operation of superconducting structures have been brought into sharper focus. For applications where low power loss and high duty factor, or exceptional beam quality and stable operation, are essential properties, and where modest energy gradients can be tolerated, superconducting structures are distinctly superior to conventional room temperature structures. (auth)
Primary Subject
Source
Particle accelerator conference; Washington, District of Columbia, USA; 12 Mar 1975; See CONF-750335--.
Record Type
Journal Article
Literature Type
Conference
Journal
IEEE (Inst. Electr. Electron. Eng.) Trans. Nucl. Sci; v. NS-22(3); p. 1118-1124
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Didenko, A.N.; Sevryukova, L.M.; Samojlenko, G.M.
6. All-union conference on charged particle accelerators
6. All-union conference on charged particle accelerators
AbstractAbstract
No abstract available
Original Title
Perspektivy ispol'zovaniya sverkhprovodyashchikh SVCh-sistem v uskoritel'noj tekhnike
Primary Subject
Source
AN SSSR, Moscow; Gosudarstvennyj Komitet po Ispol'zovaniyu Atomnoj Ehnergii SSSR, Moscow; Joint Inst. for Nuclear Research, Dubna (USSR); p. 46; 1978; p. 46; 6. All-union conference on charged particle accelerators; Dubna, USSR; 11 - 13 Oct 1978; Short note.
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Report
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AbstractAbstract
[en] A novel ac superconducting article is described comprising a composite structure having a superconducting surface along with a high thermally conductive material wherein the superconducting surface has the desired physical properties, geometrical shape and surface finish produced by the steps of depositing a superconducting layer upon a substrate having a predetermined surface finish and shape which conforms to that of the desired superconducting article, depositing a supporting layer of material on the superconducting layer and removing the substrate, the surface of the superconductor being a replica of the substrate surface. (auth)
Original Title
Patent
Source
16 Sep 1975; 8 p; US PATENT DOCUMENT 3,906,412
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Patent
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AbstractAbstract
[en] The paper summarizes the status of the most advanced superconducting slow-wave resonators of the helical, split-ring, re-entrant, Alvarez and Iris type
Primary Subject
Source
Schriber, S.O. (ed.); Atomic Energy of Canada Ltd., Chalk River, Ontario. Chalk River Nuclear Labs; p. 86-94; Nov 1976; p. 86-94; 1976 proton linear accelerator conference; Chalk River, Canada; 14 - 17 Sep 1976
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AbstractAbstract
[en] I have restricted this compilation to those applications of rf superconductivity where high fields are needed. So I have left aside applications such as frequency standards etc. I shall instantly show a table in which the laboratories upon whose work I will report are listed. I think it is important to point out that some superconducting devices have been in duty now for some time, some for several thousand hours. A question is what Q-values or what surface resistances can be obtained and high β-structures and low β-structures are described. (orig./WTR)
Secondary Subject
Source
Kuntze, M. (ed.); Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.); 340 p; Nov 1980; p. 3-26; Workshop on rf superconductivity; Karlsruhe, Germany, F.R; 2 - 4 Jul 1980
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Ingwersen, H.; Jaeschke, E.; Repnow, R.; Walcher, T.; Hochschild, G.; Lehmann, W.; Piosczyk, B.; Spath, F.; Vetter, J.E.
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Inst. fuer Kernphysik
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Inst. fuer Kernphysik
AbstractAbstract
[en] The concept is presented of a linear accelerator equiped with short superconducting resonators as accelerating elements. Saving high-frequency power remarkably reduces the operating costs as compared with normal conducting resonators. Booster systems of this type can be used to further accelerate medium heavy ions having passed on MP tandem after their charge state has been increased. (orig.) 891 WL
[de]
Es wird das Konzept eines Linearbeschleunigers vorgestellt, der kurze supraleitende Hochfrequenzresonatoren als Beschleunigungselemente enthaelt. Durch Einsparung an Hochfrequenzleistung wird eine deutliche Reduzierung erreicht. Ein derartiger Nachbeschleuniger ermoeglicht es, nach einem MP-Tandem mittelschwere Ionen nach Erhoehen ihres Ladungszustands wirksam weiterzubeschleunigen. (orig.)Primary Subject
Source
May 1978; 63 p; Translated from German. Ein supraleitender Wendel-Nachbeschleuniger fuer mittelschwere Ionen; KFK--2541.
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