A new microbeam slit system for high beam currents of 10 µA was built up to improve the brightness transport of a proton beam with a kinetic energy of up to 25 MeV into the microprobe SNAKE. The new slit system features a position accuracy of less than 1 µm under normal operating conditions and less than 2 µm if the beam is switched on and off [1]. The thermal management with a powerful watercooling and potential-free thermocouple feedback controlled heating cables is optimized for constant slit aperture. The transparent zone is reduced to 0.7 µm due to the use of mechanically lapped tungsten as slit tip material to reduce small angle scattering effects and to reduce the number of ions passing the slits with low energy loss. The slits feature electrical isolation of the slit tip to make slit current monitoring possible, e.g. for tandem feedback control. With the high possible thermal power input of 250 W we could measure for the first time the high-energy beam brightness B_exp of injected beams with high emittances of eps_    «

A new microbeam slit system for high beam currents of 10 µA was built up to improve the brightness transport of a proton beam with a kinetic energy of up to 25 MeV into the microprobe SNAKE. The new slit system features a position accuracy of less than 1 µm under normal operating conditions and less than 2 µm if the beam is switched on and off [1]. The thermal management with a powerful watercooling and potential-free thermocouple feedback controlled heating cables is optimized for constant slit...    »