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Here's what I propose for starters for the mask/LUM. I talked to Tom Markiewicz (Mr IR) this afternoon. It's clear that the mask design is not at all settled. Nor the matter of a LUM. Tom suggested we start the mask at z=50cm and r=5cm at that point. The cone would be tapered and end up ~9cm thick at the LUM. The best I can do on short notice is the following: define a 1 cm beampipe occupying the middle of the VXD. Then break it (I picked 7 cm), resuming with the mask's cone at z=50 cm with r=5 cm. This carries on to the LUM, which is the same z as the EM Cal front face. However this mask will be uniformly thick (thin, really) at 2 mm W. My guess is that at this stage of the game this is not critical and will need design work. We can bulk up the Gismo geometry code to accept whatever shape is needed later. For the small detector, I modified the inner radii on the tracking endcap disks to follow the cos(theta)=0.99 boundary - just outside the cone. I have placed Small.ini and Large.ini files that match this proposal on the web. If I don't hear (much) complaining we'll start a launch of the MC tomorrow. Richard -- Richard Dubois SLD, Stanford Linear Accelerator Center [log in to unmask] http://www.slac.stanford.edu/~richard/ 650-926-3824 650-926-2923 (FAX)