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Exploration of Long-Life Polarized Electron Sources--Advanced Energy Systems, Inc., 27 Industrial Boulevard, Unit E, Medford, NY  11763; 631-345-6264, www.aesys.net

Dr. Hans Bluem, Principal Investigator, hans_bluem@mail.aesys.net

Mr. Anthony Favale, Business Official, tony_favale@mail.aesys.net

DOE Grant No. DE-FG02-04ER83883

Amount:  $99,964

A radio frequency (RF) photoemission source that delivers polarized electrons at low emittance would be an attractive electron source for a linear collider.  Moreover, if such a source were used in conjunction with nearby injection system optics, a beam with a high ratio of transverse emittances could be delivered, thereby simplifying the linear collider’s damping system.  However, present electron source technology has not developed sufficiently to assure that such a source is feasible.  This project will fabricate a long-life, low emittance photocathode source for producing polarized electrons.  The development of this source will require a substantial improvement in the vacuum inside an RF source, or in a booster in close proximity to a DC source, as well as an understanding and reduction of the effects of ion back bombardment.  Phase I will study three configurations for beam dynamics and ion back bombardment and choose a configuration and operating temperature, so that the source for polarized electrons can be designed and fabricated in Phase II.

Commercial Applications and Other Benefits as described by the awardee:  All linear collider designs should benefit from long-life, low-emittance polarized sources, which would significantly ease the requirements on the damping rings.  As an additional benefit, sources with a solenoid field on the cathode followed by a flat beam transformer could provide large aspect ratio beam emittance.