On-line Identification of Electro-Conductivity in Electrolytic Solutions

An on-line method is proposed to identify electro-conductivity in electrolytic solutions. The method uses a model of a cell of electrolytic solutions in a micro reactor modeled by an electronic circuit. The circuit consists of a cell part with a resister and a capacitor connected in series and a measurement part having a resister. Then the resistance and the capacitance of the cell part are identified to calculate the electro-conductivity. The identification scheme is the least-square method with a forgetting factor calculated on-line. To avoid the effect of differentiation of measured signals, a filter is added to the identification method. The effectiveness of the proposed control scheme is shown by numerical simulation.</p

Beam diagnostics using a chopped beam

A new type of beam chopper has been developed and installed at HIMAC (Heavy Ion Medical Accelerator in Chiba) in NIRS (National Institute of Radiological Sciences).The chopper has only 11.6 cm length and has been set between the ion sources and the RFQ.It is similar to a beam transformer, and modulates the beam kinetic energy by 10%.The beam is successfully chopped because the RFQ has a rather small energy acceptance. A chopped beam was injected into the synchrotron and a beam study has been performed.A very short bunch was formed and accelerated to the topenergy.The behavior of the short bunch shows that a dipole oscillation was excited because of an unexpected frequency error of the RF system.It was caused by noise in the B-clock (Gauss Clock)circuit. The dipole oscillation caused by the frequency error was signi &#64257;cantly reduced and the acceleration efficiency was improved by replacing the B-clock module