The Flat Beam Experiment at the FNAL Photoinjector

Details The Flat Beam Experiment at the FNAL Photoinjector The Flat Beam Experiment at the FNAL Photoinjector

2000-08-12

arxiv.org/abs/physics/0008042v1

eConf C000821 (2000) THc13

Physics

Accelerator Physics

Linac2000 conf paper, 3 pages and 4 figures

Scientific paper

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.[1] 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. Thus far, transverse emittance ratios as high as 50 have been observed, and the results are in substantial agreement with simulation. [1] R. Brinkmann, Ya. Derbenev, K. Floettmann, "A Flat Beam Electron Source for Linear Colliders." TESLA Note 99-09, April 1999.

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