D11+ - Collimation mechanisms

Because of the shortage of space in the upstream part of the collimation, there is 2 types of mechanisms. The 3 first mechanisms are “vertical” (i.e. the translation table is vertical), then the 10 downstream mechanisms are “horizontal”. The principle is the same for both types of mechanism. They are composed of: - a fixed support plate equipped with rail, linear ball screw and translating motorisation, limit switches. - a translating plate, that support collimation optics (guide, absorbing pipe comprised of a series of diaphragms) is guided by the rails and moved by the motorisation. - a series of calipers that hold the sections of guides and aborbing pipes Remark : a series of pads passing through housings flanges links the collimation mechanisms to the support table. Most of the parts are made of steel. The main parts of the collimation mechanism are machined plate and small machined parts (caliper, switch and motor supports, support pad,…). Although the principle is the same for both type of mechanisms, the implementation is different: the support table of the vertical system is mainly made of welded assemblies (special beam, jambs). The size of the larger plate is 450 x 1500 x ép.12 mm. The commercial or off-the-shelf parts are out of the scope of the call for tender. They will be ordered directly by the ILL. The mounting of rails, motors, sensors and switches will be of the ILL responsibility. As the collimation mechanics are coupled to the housings, we would like to pre-mount the support plate in the premises of the housings producers. So if would therefore be an asset to have the same producer or neighbouring producers for the collimation mechanics and the housings. For the vertical collimation mechanics, the manufacturer should be a boiler making company, able to perform re-machining over 1.5 m. For the horizontal collimation mechanics, the manufacturer should be a company specialized in the machining of small series and 1.5 m size parts.