Dear Colleagues, I am announcing that CCB has received a change request proposal for the Polarized Electron Source (PES) section of GDE/ILC BCD from A.Brachmann, who is representing the e- source AG. The change request seeks to apply four revisions to the BCD - 1. Eliminate the second normal conducting beam line, which was originally conceived as a backup 2. Eliminate cavern for the laser system; locate the laser system in a surface building and add a small diameter shaft (d = 1.5 m) for transporting the laser beam. 3. Modification of 'dogleg' section of beamline - Replace with vertical chicane. 4. Eliminate 2 L-band bunchers and NC pre-accelerator with combined TW tapered L-band bunching and pre-acceleration section. The main motivation for this CCR to the electron source baseline design is to reduce the overall cost of this area, and according to the requester the cost impact corresponds to Class-1. The CCB is taking the following actions. - This Change Request hereafter is called CCR#22. - CCB tentatively classifies CCR#22 as Class-1. - Kuriki and Toge are assigned as CCB reviewers, pending confirmation. Now this request is brought to review by the CCB, and is also open to general discussion. Any members of GDE or GDE-related task groups with comments or questions on this request, please, direct them to ml-ccb@xxxxxxxxxxxx and/or ml-ext-gde@xxxxxxxxxxxx by the end of Tuesday, Nov.21, 2006, PST. My thanks in advance for your cooperation. BCD is available at http://www.linearcollider.org/wiki/doku.php?id=bcd:bcd_home BCD change history is available at http://www.linearcollider.org/wiki/doku.php?id=bcd:bcd_history Sincerely, - Nobu Toge (KEK, Accelerator Lab) email: toge@xxxxxxxxxxxx voice: +81-29-864-5224 fax: +81-29-864-3182 ------------------------------ Subject: E- source Change Request From: "Brachmann, Axel" <brachman@xxxxxxxxxxxxxxxxx> To: "N.Toge" <toge@xxxxxxxxxxxx> Cc: "Paterson, Ewan" <jmp@xxxxxxxxxxxxxxxxx>, "Sheppard, John C." <jcs@xxxxxxxxxxxxxxxxx>, "Raubenheimer, Tor O." <tor@xxxxxxxxxxxxxxxxx> Date: Thu, 16 Nov 2006 12:06:26 -0800 Thread-Topic: E- source Change Request Dear Nobu, Attached you will find my (combined) change request for the e- source as discussed in Valencia. One file outlines the technical changes, the second gives more detail on the cost impact. Please let me know of any questions. The files are in editable format for your convenience. Best regards, Axel.
Change Control Request e-.doc
Description: MS-Word document