I. BOHNET, R. BRINKMANN, K. DESLER, K. FLOETTMANN, (DESY), D. A. EDWARDS, H. T. EDWARDS, N. HOLTKAMP, S. NAGAITSEV, J. K. SANTUCCI (FNAL), M. FERRARIO (INF)
A technique for production of an electron beam with a high transverse emittance ratio. a 'flat' beam, has been proposed by Brinkmann, Derbenev, and Floettmann. The cathode of an RF-laser gun is immersed in a solenoidal magnetic field: as a result the beam emitted from a round laser spot has a net angular momentum. Subsequent passage through a quadrupole channel that has a 90 degree difference in phase advance between the transverse degrees of freedom results in a flat beam. Experimental study is underway at the Fermilab A0 Photoinjector. At the date of preparation of this abstract, qualitative observations are consistent with prediction, and quantitative study is in progress. Results, including measured emittance ratios and comparison with prediction of simulations, will be shown.
 R. Brinkmann, Ya. Derbenev, K. Floettmann, 'A Flat Beam Electron Source for Linear Colliders.' TESLA Note 99-09, April 1999.
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