Hall effect magnetic regulation systems for the CESR injector

Two distinct Hall effect regulation systems have been designed for reduction of hysteresis effects in the linac and transfer line magnets used for injection into the Cornell Electron Storage Ring (CESR) synchrotron. One magnetic field probe described integrates a precision Hall sensor element with low-drift preamplification electronics in a temperature-regulated remote sensing module. Magnetic field stability better than five parts in 10⁴ is achieved by a prototype system which includes this module and its associated signal processing electronics. A second Hall effect regulator design utilizes an inexpensive monolithic linear sensor/amplifier device to attain a minimum repeatable accuracy of 0.5%. The radiation and mechanical stress sensitivity of the Hall sensors employed is evaluated to estimate their operational viability in the injector environment. It is concluded that the service lifetime of either Hall probe type will be at least three years in the CESR injector, given an average neutron exposure rate not exceeding 10¹⁰ n/cm²/s