• N.A.Vinokurov, D.A.Kayran, B.A.Knyazev, E.I.Kolobanov, V.V.Kotenkov, V.V.Kubarev, G.N.Kulipanov, A.V.Kuzmin, A.S.Lakhtychkin, A.N.Matveenko, L.E.Medvedev, S.V.Miginsky, L.A.Mironenko, A.D.Oreshkov, V.K.Ovchar, V.M.Popik, T.V.Salikova, S.S.Serednyakov, A.N.Skrinsky, O.A.Shevchenko, M.A.Scheglov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The first stage of Novosibirsk high power free electron laser (FEL) was commissioned in 2003. It is based on the normal conducting CW energy recovery linac (ERL). Now the FEL provides electromagnetic radiation in the wavelength range 120 - 230 micron. The maximum average power is 400 W. The minimum measured line width is 0.3%, which is close to the Fourier-transform limit. Four user stations are in operation now. Manufacturing of the second stage of the FEL (based on the four-turn ERL) is in progress.

• A.Batrakov, P.Vobly, S.Zverev, I.Ilyin, V.Kozak, E.Kuper, V.Mamkin V.Ovchar, G.Fatkin, V.Tsukanov, A.Volkov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

In BINP for creation of measuring systems with Hall sensors CAMAC - electronics were used many years. This system had good parameters and successfully used for measurements of magnets produced in BINP as for installations of VEPP-family as for foreign facilities: LHC (CERN), SLS (Switzerland), BESSY (Germany), SAGA (Japan). Hardware deterioration and MS DOS application of previous system demanded to design a new electronics and modern software. The paper describes the new VME-based system and MS Windows application developed for replacement of old system. The system hardware consists of VME crate controller, VME - RS-232 interface, VME - CAN interface and three specialized units: Hall-Sensor analogue Interface (VMEHSI), precision ADC (VMEADC16) and Hall carriage Thermo Stabilizer (HTS), fabricated in Budker INP. Resolution of measuring devices is less than 1uV and stability is better than 10^-5. Software of the Hall-sensor measuring system consists of embedded part, which operates on VME-controller under the mcLinux operational system, and user's high-level software "WinHall", which is a MS Windows application with user-friendly graphical interface. The features of new system and practice results are reported.

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• V. Ovchar, E. Kuper
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

• K.Dahlerup-Petersen, G.-J. Coelingh
  Accelerator Technology Department, CERN, Geneva, Switzerland

Cluster of 8 electro-mechanical D.C. breakers will be used for current interruption and fast extraction of magnetic field energy to dump resistors in the superconducting chains of main dipoles and quadrupoles in LHC (Large Hadron Collider), CERN, Switzerland. Parallel connection (four brunches) and series connection (two in series) will be used in cluster for current and voltage matching. Contact erosion as usual occurs in the slowest branch, in two breakers from eight in cluster. The number of interruption is limited by contact erosion and some parts need replacement after some interruptions with arcs. The total number of breakers in the system is 256. For breakers resources registration and for prophylaxis works facilitation the 8 channels Arc Detector was designed. Each channel consists of light signal integrator, comparator and counter of events. Spark Detector for registration of discharges in power RF generators and feeders was designed on the base of Arc Detector

255

• P.A.Golubev, V.E.Karlin, E.I.Kolobanov, S.A.Krutihin, G.Ya.Kurkin, V.K.Ovchar, S.S.Serednyakov, S.V.Tararyshkin, N.A.Vinokurov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The device for forming pulsed electron current for injection into accelerators was designed and realized. The pulse current duration is 0.5 ns and average electron current is from zero up to 110 mA. The charge of electron pulse is variable from zero up to 1.5 nC.

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