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Proch, D.; Thiele, K.
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.)
AbstractAbstract
[en] A cavity of an acceleration unit built up from one or more individual resonators is filled to about half way with ceramic grinding bodies and with water, and turned slowly at about 9 rpm. The rotation is maintained for about a week. The inner surface of the cavity is thus smoothed and freed of faults, so that the cavity can be used without difficulty in superconducting operation with improved properties. By this simple process, success is achieved in increasing the practically possible longitudinal field strength for acceleration by at least a factor of 2 or more, i.e. one can save at least half the acceleration units. To remove grinding wear, the cavity is also filled with an acid mixture of about 1 part of HF, 1 part of HNO3 and 6 parts of H3PO4 and cleaned, and the surface is etched. (orig.)
[de]
Ein aus einem oder mehreren Einzelresonatoren aufgebautes Cavity einer Beschleunigungseinheit wird mit keramischen Schleifkoerpern und mit Wasser etwa zur Haelfte gefuellt und in langsame Drehungen von etwa 9 U/Min versetzt. Die Drehungen werden etwa eine Woche lang aufrechterhalten. Dabei wird die innere Oberflaeche des Cavity's derart geglaettet und von Fehlern befreit, dass das Cavity ohne Schwierigkeiten im supraleitenden Betrieb mit erheblich verbesserten Eigenschaften eingesetzt werden kann. Durch das angegebene einfache Verfahren gelingt es naemlich, die im praktischen Betrieb erreichbare Laengsfeldstaerke zur Beschleunigung um mindestens einen Faktor 2 oder mehr zu erhoehen, d.h. mindestens die Haelfte der Beschleunigungseinheiten einzusparen. Zur Entfernung von Schleifkoerper-Abrieb wird das Cavity ausserdem mit einer Saeuremischung von etwa 1 T HF, 1 T HNO3 und 6 T H3PO4 gefuellt und so gereinigt und dabei oberflaechlich gebeizt. (orig.)Original Title
Verfahren zur Behandlung der inneren Oberflaeche von supraleitenden Cavities (Hohlraum-Resonatoren)
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4 Jul 1985; 21 Dec 1983; 11 p; DE PATENT DOCUMENT 3346178/A1/; ?: 21 Dec 1983
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Patent
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[en] A method of coarse alignment and fine tuning of the cavity of a gas laser is presented. The laser cavity to be aligned is treated as a Fabry--Perot cavity, and its transmission of a frequency-swept laser is maximized. An experiment is described showing that this fine-tuning procedure results in maximum power output when the laser is operated. The method is particularly well-suited to laser manufacturing
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Review of Scientific Instruments; v. 46(8); p. 1040-1042
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[en] A theory of the modes in a resonator bounded by the surface of a triaxial ellipsoid was given previously by Weinstein. We have applied this theory to characterize the modes observed in a large-aperture Brewster-window laser. Recognizing that Brewster windows impart astigmatism to the laser cavity, we can find an equivalent ellipsoidal cavity with which to associate the modes. The theory predicts various forms of mode structure, depending on the total astigmatism present. We have verified the theory experimentally and show that high-order modes having rectangular symmetry may be obtained even though a circular aperture is used in the cavity. (auth)
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Journal of the Optical Society of America; v. 65(8); p. 867-875
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Halbritter, J.; Baumgaertner, H.
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.)
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.)
AbstractAbstract
[en] The quality of superconducting cavity resonators depends greatly on the surface quality of the cavities. The invention describes a process for the manufacture of superconducting cavity resonators with improved surface quality, where cavity resonators of complicated shape with cavities coated with NbN can be produced. (orig.)
[de]
Die Guete supraleitender Hohlraumresonatoren haengt sehr stark von der Oberflaechenqualitaet der Kavitaeten ab. Die Erfindung betrifft ein Verfahren zur Herstellung supraleitender Hohlraumresonatoren mit verbesserter Oberflaechenqualitaet, wobei auch kompliziert geformte Hohlraumresonatoren mit NbN-beschichteten Kavitaeten realisiert werden koennen. (orig.)Original Title
Verfahren zur Herstellung supraleitender Hohlraumresonatoren
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24 Sep 1987; 12 Mar 1986; 2 p; DE PATENT DOCUMENT 3608160/A1/; ?: 12 Mar 1986
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Patent
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[en] We present both the theory and an experimental method to accurately set up a Guoy phase telescope, where both the output spot size and orthogonality condition are invariant to distance from the cavity beam waist. We demonstrate that Gaussian spot size measurements can be used as a diagnostic to determine the desired locations of split area photodetectors. The Guoy phase invariance is verified using the tilt-locking technique
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5. Edoardo Amaldi conference on gravitational waves; Tirrenia (Italy); 6-11 Jul 2003; S0264-9381(04)68888-5; Available online at http://stacks.iop.org/0264-9381/21/S909/cqg4_5_080.pdf or at the Web site for the journal Classical and Quantum Gravity (ISSN 1361-6382) http://www.iop.org/; Country of input: International Atomic Energy Agency (IAEA)
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[en] A new approach is presented to the problem of unstable laser resonators. A stable resonator is considered in which a thin diverging lens is inserted near one mirror. By varying the focal length of the lens, the lens-resonator system can go from stable to unstable. The field in the lens-resonator system is expanded in terms of the normal modes of the original stable resonator. The polarization of the lens causes coupling of the stable modes. The present method allows one to introduce the active lasing medium in a natural way, as is shown. The normal modes of the unstable resonator are obtained numerically, along with analytic solutions in certain limiting cases. A physical discussion of the unstable resonator problem is given in terms of a pseudospin picture. (U.S.)
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Physical Review. A; v. 11(2); p. 630-647
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No abstract available
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(c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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No abstract available
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Applied Optics; v. 13(11); p. 2546-2561
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[en] The number density and orientation of molecules at the surface of a total-internal-reflection-ring minicavity are probed with extremely high sensitivity in a novel realization of the cavity ring-down optical absorption experiment. The modes of the ultralow-loss cavity, which are excited by photon tunneling, have long lifetimes that are sensitive to the presence of absorbing species in the evanescent field near a cavity facet. The total-internal-reflection-ring cavity extends cavity ring-down spectroscopy to surfaces and condensed matter, permitting a wide range of novel fundamental studies and applications. Routine single molecule detection may ultimately be feasible. copyright 1999 The American Physical Society
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[en] Low β structures are used in proton and ion accelerators. This paper is restricted to additional design criteria for the superconducting accelerator projects. (orig./WTR)
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Kuntze, M. (ed.); Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.); 340 p; Nov 1980; p. 237-242; Workshop on rf superconductivity; Karlsruhe, Germany, F.R; 2 - 4 Jul 1980
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