Recent information from Danfizik indicates that the magnet coil will be slightly thicker than designed. This change in thickness results from bulging of the coil in the region of the sharper bends. The change is slightly less than 1 mm per pancake, or roughly 5-7 mm total. This means that the top of the coil is still below the top of the pole tip but not by the same amount as before. As a result, we need to worry about possible interference with the thermal shield and also the proposal to replace the coil clamps with straps.
The shield drawing shows the location of the coil and the thermal shield. The thicker part of the shield is shaded and the edge of the top of the coil is marked by a thick line. Assuming the dimensions in this drawing are accurate, the thicker part of the thermal shield is no closer than about 25 mm from the edge of the coil top. Since the coil slopes down at an angle of roughly 40 degrees, this means that the surface of the coil should be about 20 mm lower at the location of the shield thick sections. This is enough clearance. HOWEVER, the manifolding connection from the top coil must bend down so that it can clear the thick section of the thermal shield.
The strap drawing (drawing from Danfizik) shows the proposed straps to hold down the magnet. A separate top view shows the locations of the straps. Note that the extension of the straps outside the coil in this top view is smaller than shown in the Danfizik sketch. The fixture used to hold down the magnet must be smaller than proposed in order to stay inside the profile of the magnet pole support plate. The available space is at most 5-6 cm while the fixture shown extends out by almost 10 cm. Care should be taken even on the edges of the coil that are at +/- X because we have an option of moving the coil out from the beamline by 5 or 10 cm. In that case, we also have only 5-6 cm available for the fixture.
Entry posted by George Stephans.
Last edited: Friday, February 04, 2000 01:38:46 PM
