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    V.Bogdanov, I.N.Vasilchenko, O.L.Veresov, T.P.Virkunen, M.F.Vorogushin, A.V.Galchuk,

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    V.Grigorenko, Yu.V.Zuev, V.A.Kislov, V.G.Mudroljubov, A.P.Strokach (FSUE D.V. Efre-

mov Scientific Research Institute of Electrophysical Apparatus, St.petersburg, Russia) New compact cyclotron CC-18/9 designed and manufactured in NIIEFA

In the paper is presented a brief description of a cyclotron providing the acceleration of negative hydrogen and deuterium ions to energies of 18 and 9 MeV respectively. The cyclotron is in- tended to produce short-lived and ultra short-lived radio isotopes. The beam is extracted by charge-exchange of ions by stripping foils. The specific feature of the machine is location of the resonance system inside the vacuum chamber of a shielding-type magnet as well as the vertical position of the median plate of the magnet. The cyclotron has a beamline to transport the beam to remote targets. Two such machines have been manufactured and put into operation: one cyclo- tron is operated in the PET center of Turku, Finland and the other is functioning in the medical center in Pesochnaya in St.Petersburg, Russia

Dr. Andrey Pavlovich Strokach: npkluts@niiefa.spb.su

Plenary session: Magnetic and power supply systems for accelera- tors

L.Belova , M.Egorychev (Budker Institute of Nuclear Physics, Novosibirsk, Russia); J-L.Perinet- Marquet, C.Urpin (CERN, Switzerland)

Design and manufacture of the superconducting bus-bars for the LHC main magnets

The main magnets of the LHC are series-connected electrically in different powering circuits by means of superconducting bus-bars carrying a maximum current of 14 kA. These superconduct- ing bus-bars consist of a superconducting cable thermally and electrically coupled to a copper profile all along the length. The function of the copper profile is essentially to provide an alterna- tive path for the current in case the superconducting cable loses its superconducting state and re- turns to normal state because of a transient disturbance or of a normal zone propagation coming from the neighboring magnets. When a superconducting bus-bar quenches to normal state its temperature must always stays below a safe value of about 100 degrees C while the copper is conducting. When a resistive transition is detected, the protection system triggers the ramping down of the current from 14000 kA to 0. The ramp rate must not exceed a maximum value to avoid the transition of magnets series-connected in the circuit. This paper concerns the design and the manufacture of high current superconducting bus-bars needed to interconnect the mag- netic elements of the main dipoles, the main quadrupoles of the arcs and of the dispersion sup- pressors of the LHC.

Dr. Jean-Louis Perinet-Marquet: jean-louis.perinet-marquet@cern.ch

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