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[en] First publications on impedance of laminated vacuum chambers are related to early 70s: those are of S. C. Snowdon (1) and of A. G. Ruggiero (2); fifteen years later, a revision paper of R. Gluckstern appeared (3). All the publications were presented as Fermilab preprints, and there is no surprise in that: the Fermilab Booster has its laminated magnets open to the beam. Being in a reasonable mutual agreement, these publications were all devoted to the longitudinal impedance of round vacuum chambers. The transverse impedance and the flat geometry case were addressed in more recent paper of K. Y. Ng (4). The latest calculations of A. Macridin et al. (5) revealed some disagreement with Ref. (4); this fact stimulated us to get our own results on that matter. Longitudinal and transverse impendances are derived for round and flat laminated vacuum chambers. Results of this paper agree with Ref. (5).
[en] To prevent the hazardous effects of air ingress into accelerators and into the ultrahigh vacuum of these; a fast-action flap valve for large rated diameters and with a maximum response time of 10 msec has been developed. The valve is characterized by short paths and small amounts of a titanium alloy. (TK)
[de]Um schaedliche Einwirkungen von Lufteinbruechen in Beschleunigersysteme und deren Ultrahochvakuum zu verhindern, wurde ein Schnellschluss-Klappenventil fuer grosse Nennweiten bei einer Schlusszeit von maximal 10 msec entwickelt. Dies wird u.a. durch kurze Wege sowie durch geringe Massen einer Titanlegierung erreicht. (TK)
[en] The difficulties encountered while utilising suction-cups, are mainly caused by the skirts. The skirts are more or less adaptable to the surface of the objects to be handled. The skirt of the device presented, is made out of a round supple elastic bag containing solid particles. By creating a vacuum in the bag, the particles become a solid entity. The bag filled with the particles becomes rigid and can take exactly the shape of the object to be lifted. By creating a second vacuum in the axis of the bag, the object can be lifted. Several suction-cups can be used simultaneously
[en] The hot cathode is situated in a side chamber of the ionisation chamber and is continuously connected to a vacuum pump such creating a lower pressure in this side chamber than in the ionisation chamber itself. The deviating magnet is situated where the side chamber branches are and leads the electrons to the anode. The positive ions generated by ionisation were accelerated by a negative electrode in the opposite direction of the electrons. (P. K.)