Abstract
We have developed a Lorentz angle measurement system for cool gas mixtures in the course of our R&D for a proposed JLC central drift chamber (JLC-CDC). The measurement system is characterized by the use of two laser beams to produce primary electrons and flash ADCs to read their signals simultaneously. With this new system, we have measured Lorentz angles for CO 2/isobutane gas mixtures with different proportions (95 : 5, 90 :10, and 85 : 15), varying drift field from 0.6 to 2.0 kV/ cm and magnetic field up to 1.5 T . The results of the measurement are in good agreement with GARFIELD/MAGBOLTZ simulations.
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