• 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.

55

• V. Vogel, Y.H. Chin, M. Akemoto, S. Matsumoto, S. Tokumoto,
  High Energy Accelerator Researcher Organization (KEK), Japan

• E. Kokin, A. Volkov, A. Cherepenko
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

• V. Revkov, U. Valyaev, A. Fogel, D. Valyaev
  Branch of Institute of Nuclear Physics, Protvino, Russia

• A. Malenkov
  Institute of High Energy Physics, Protvino, Russia

The Solid State Induction type modulator was developed at KEK for the JLC project. This modulator was design for tunnel installation. The modulator consist from two oil-filled tanks, the first is for two klystrons and the second for pulse transformer. The pulse transformer consist from 42 core made from Finmet3 material, each core is drive by voltage 3.2 kV by two IGBT plates in parallel, one of them has core reset circuits. The total number of IGBT plates is 84. Each core has one turn at primary and transformer has four turns for secondary. This modulator can drive: short up to 1.6 microsecond, high voltage up to 500 kV pulse with current up to 540 A for two X-band 75 MW klystrons. The pulse top flatness is 2%. The expected modulator efficiency is about 75%. The step one of the modulator test was done in the summer of 2005, 300 kV of output voltage and full current at 1 pps was achieved.

174

• E.G.Miginskaya, I.I.Morozov, V.M.Tsukanov, A.A.Volkov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

Temperature variation of RF-cavities leads to a change of their geometrical sizes that provides undesirable cavity modes and to excitation of phase oscillations. It leads to decrease in luminosity and a beam life time. Flowing water heaters with stabilization of temperature have been established for elimination of this disadvantage. Temperature probes LM335 were used with a sensitivity of 10 мВ per degree. The power part is made on the controllable switches CPV240. The analysis of temperature of input and output temperatures of water is carried out by microcontroller ADAM connected to a computer by means of interface RS-485. The temperature variation have been reduced from 5 to 0.2 degrees centigrade. That has led to decrease in probability of occurrence of parasitical phase oscillations more than in 100 times.