PROBLEMS OF INSTALLATION OF VIBRATING WIRE SCANNERS INTO ACCELERATOR VACUUM CHAMBER*

In [1] the frequency of self-oscillations is proposed to use as information about the interaction rate of charged particles on the wire of a beam-profile wire scanner. The frequency strongly depends on the wire temperature. The temperature is determined by the beam intensity in the wire cross section. Oscillations are excited by an interaction of an alternating current in wire with a permanent magnetic field. In this work the problems of the installation of a vibrating wire based scanner into a vacuum chamber of an accelerator are discussed: Restriction on the scanner magnet system due to beam dynamics, problem of installation into vacuum chamber, scanning mechanism development, influence of temperature, material choice, thermo-compensation assembling and electrical disturbances from the beam. Based on the notices of [2] it is proposed to investigate also the possibility of oscillation excitation by mechanical stimulation. Another possibility of excitation can be a parametric resonant mechanism generated by special piezoelectric transducers. Oscillations can be detected by piezoelectric or optical ways and can also serve as source of beam profile information.