The slit system is used to cut and collimate the ion/fragment beam in the transversal beam direction (horizontally or vertically). It consists of 12 horizontal (x-slits) and 6 vertical (y-slits) slit-pairs. The basis of the slit systems of the Super-FRS are two metal blocks of DENSIMET®185 (96% tungsten, 3% nickel and 1% iron) which have to move in a vacuum chamber in horizontal direction (0 - 400 mm) and in vertical direction (0 - 200 mm), respectively. Due to the highly radioactive environment particularly in the Pre-Separator, some of the slits are designed to allow for robot handling. Overview of x-slit system is shown below.
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