Charge resetting foil
The RMS provides reset foils on two different frames. A standard frame is approximately 12.5 mm x 25 mm area with 2 mm sides. A RIB frame, see fig. 1, is made of 0.1 mm thick, tantalum strips welded together and to form a 30 mm square area. The carbon foil is mounted on the "knife-edge" to minimize the cross-section of the frame exposed to Coulomb scattering of the beam from the target and to minimize the shadowing of any detectors (such as HyBall) downstream. An initial test of a charge reset foil mounted on a RIB frame with HyBall resulted in a slightly higher HyBall rate (2.5% increase) while producing a 60% higher recoil rate.
A photograph of the inside of the RMS target chamber. A target and charge reset foil mounted on a RIB frame may be observed.
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