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P.42. V.Kaplin, S.Karnaev, I.Morozov, O.Plotnikova (Budker Institute of Nuclear Physics, No- vosibirsk, Russia)

The precision measuring temperature system of the electron-positron collider VEPP-4M

The temperature of the magnets is an important factor of the average energy stability of the circulating bunches. The work describes the VEPP-4M temperature measurement sys- tem based on 32 channel temperature controllers using High-Precision Digital Thermome- ters DS1621 and DS1631 with the resolution 0.02 and 0.06 degrees centigrade respec- tively. Temperature values are renewed for the all of 32 channels of each controller every second automatically. The controllers are connected to PC via serial interface RS232/RS485. The program running in PC inquires all controllers and writes data to da- tabase in terms of PostgreSQL at every minute. The graphic interface provides browsing of the temperature diagrams of the selected sensors over any period of time. The programs run under Linux and use Motif library.

Olga Anatolievna Plotnikova: oplot@inp.nsk.su

P.43. V.P.Cherepanov, E.N.Dementev, A.S.Medvedko, V.V.Smaluk, D.P.Sukhanov (Budker Institute of Nuclear Physics, Novosibirsk, Russia)

The VEPP4-M transverse bunch-by-bunch feedback system

The fast head-tail and coupled-bunch instabilities are the reasons of the increased beam emittance, energy spread and of the operating current limitations and beam loss. For sup- pression of any excited transverse mode of the beam oscillation the wide-band bunch-by- bunch digital feedback system have been developed and installed on the VEPP-4M stor- age ring. A description of the system parameters and architectures, of the available diag- nostic tools and of the experimental results is given.

Dmitry Petrovich Sukhanov: Dmitry_S@inp.nsk.su

P.44. D.Liakin, O.Sergeeva, Vl.Skachkov (SSC of Russian Federation Institute for Theoretical and Experimental Physics, Moscow, Russia); P.Forck, T.Giacomini (GSI, Darmstadt, Germany); Vic.Skachkov, A.Vetrov (NPI at MSU, Moscow, Russia)

Magnetic system for residual gas monitor

The advanced residual gas monitor requires very careful design of each structural compo- nent and special attention to match the properties of different subsystems. An important point is a proper magnetic guiding system design. As it is shown, high field uniformity, which is required for sub-mm spatial resolution, can be achieved despite the presence of the field-distorting hole for the light signal transmitting. The low energy (down to 10 MeV/u) beam disturbance compensation methods are also discussed. The ionization proc- ess and electron dynamics simulations are used for proving this system design.

Dr. Vladimir Sergeevich Skachkov: skachkov@itep.ru


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