From: "William Podgorski"Message-Id: <9509011400.ZM18212@cface4.harvard.edu> Date: Fri, 1 Sep 1995 14:00:43 -0400 X-Mailer: Z-Mail (3.2.0 06sep94) To: mordway@cfa.harvard.edu, schwartz@cfa.harvard.edu, dd, hughes@cfa.harvard.edu, vanspeybroeck@cfa.harvard.edu, norton@cfa.harvard.edu Subject: Preliminary Calcualtions of TMA Grating Position Cc: wap@cface4.harvard.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Status: R I ran some raytraces of the TMA mirror using OSAC parameters which I received from Jack Hughes. The coordinate system used is the OSAC system, with the Z = 0.0 plane located at the WIDE end of the P. I ran both infinite and finite source cases. The finite source distance was assumed to be 1744.6 ft(531,754mm). This places the centerline of the TMA approximately 14.6 ft WEST(away from the fource) of the Pier "2" centerline, which is also the HRMA centerline. This is per Ed McLaughlin's sketch of the TMA installation. The grating plane is placed 5000 mm from the finite source focal plane, thus resulting in an avg ray ring diameter of 349.1 mm. The shutter plane is assumed to be ~546 mm from the TMA mid-plane, as installed before. The avg ray ring diameter at the shutter plane is 385.58 mm. Axial Station Infinite Source Finite source Ray Ring Diameter (mm from wide end of P) (for ref only) ----------------------------------------------------------------------------- X-ray Point Source -Infinity -531754 mm Wide end of P 0.00 mm 0.00 mm Center of P 180.26 mm 180.26 mm Narrow end of P 360.52 mm 360.52 mm P/H Midplane 400.94 mm 400.94 mm Wide end of H 441.37 mm 441.37 mm Center of H 621.60 mm 621.60 mm Narrow end of H 801.82 mm 801.82 mm Shutter Blade Plane N/A 947.00 mm 385.58 mm Grating Plane N/A 1469.55 mm 349.10 mm Focal Plane 6400.58 mm 6469.55 mm -- =============================================================================== William A. Podgorski Harvard-Smithsonian Center for Astrophysics, Smithsonian Astrophysical Observatory Email: wpodgorski@cfa.harvard.edu 60 Garden Street, MS 5 Phone: 617 495 7363 Cambridge, MA 02138 FAX: 617 495 7098 USA