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Those are sections, not perspectives. They should be literally what you would see if you cut through the detector at the specified z. The flange appears to be positioned so the photon hole is somewhat to one side and angled out - if you look closely at the sections you can see that the photon hole is further from the center at z=150 than it is at z=137. I've attached two perspective views of the whole geometry. Relevant people, please comment on whether these statements are correct, with (0, 0, 0) being the beam spot on target and the Z-axis being parallel to the magnet bore: * This is the frame we want to use for SLIC/LCSim. * Beam enters at an angle of 30 mrad from Z, pointing into the positron side. * Center of the analyzing magnet is at z = 45.22 cm. * SVT is rotated 30 mrad into the positron side. * ECal is completely symmetric around the Z-axis (aside from the missing crystals). Front face is at z = 137 cm. * ECal flange has photon hole shifted 16 mm to the positron side at the front face of the flange (z = 135 cm), and 30 mm to the positron side at the rear face (z = 179 cm). * ECal flange has electron bulge at the size and shape seen on my sections. That's what I see in this geometry. If any of these statements are false, we need to fix the geometry to match. On Tue, 13 Nov 2012, Maurik Holtrop wrote: > Hello Sho, > > I am a little confused about the pictures that you are drawing. The top one seems to have a vacuum "bulge" area that is too small. The "bulge" is supposed to fill up the gap of all the crystals that were removed. Is that some effect of the perspective? > > The other issue is that the photon hole should be right through the center of the ECAL. > > Best, > Maurik > > Looking along the beam line, +x towards the left, +y towards the top. > > > On Nov 13, 2012, at 7:11 PM, Sho Uemura <[log in to unmask]> wrote: > >> Okay, here's some sections of the flange at different values of Z; center of viewer is (0,0) I think - I have no idea what I'm doing but I managed to get SLIC to display the geometry. >> >> Looking at the Z=150 view, it looks like the photon hole is ~15 mm (somewhat more than one crystal width) from the center, where you'd want it to be at (150 cm)*(30 mrad) = 45 mm? > > > ######################################################################## > Use REPLY-ALL to reply to list > > To unsubscribe from the HPS-SOFTWARE list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1 > ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1