Received: by exchange02.bnl.gov id <01C1CB74.12452210@exchange02.bnl.gov>; Thu, 14 Mar 2002 11:19:52 -0500 Message-ID: <1655641A03CED411BDCB0002B309452401298917@exchange02.bnl.gov> From: "Rank, James P" To: "Malm, Leslie K" , "Hemmer, F Michael" , "Hseuh, Hsiao-chaun" , "Simos, Nikolaos" , "Ludewig, Hans" , "Raparia, Deepak" Cc: "Tuozzolo, Joseph E" , "Rank, James P" Subject: Q19 collimator Date: Thu, 14 Mar 2002 11:19:52 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Gents- This AM we had a meeting to solve the interference issue at the Q19 collimator. The proposed solution involves both the translation of the collimator location, within the limits of the optics, and a reconfiguration of the corrector, and quad vacuum chamber and stand. Furthermore, it may require a custom bellows assembly. The following will be instituted in the RTBT design. 1. The collimator will translate D/S by 55 cm such that the center to center distance from Q19 to collimator will be 1.90 m. 2. The quadrupole stand will be rotated 180 degrees about the quad center. 3. The corrector at Q19 will thus be mounted U/S of the Q19 by the same center to center distance. 4. We will look to design a custom, short-length bellows with integral CFX flanges for the interconnect between the quad chamber and the U/S collimator flange. 5. IF in 4) EJMA design requirements cannot be met with a conventional thin-walled, single-ply formed bellows, we will revert to EITHER 6) or 7) below. 6. EITHER Design a unique quadrupole chamber at Q19 (current design used in 6 places) which integrates the bellows into the chamber allowing the bellows to reside inside quad coils. 7. OR Truncate the collimator beam tube and recess it's U/S CFX chain clamp flange into the shielding layers at the leading edge of the collimator. -jr