| An experimental program to perform a proof of principle of transverse to longitudinal emittance exchange (epsilonxin ⇔ epsilon zout and epsilonzin ⇔ epsilon xout) has been developed at the Fermilab A0 Photoinjector. A new beamline, including two magnetic dogleg channels and a TM110 deflecting mode radio frequency cavity, were constructed for the emittance exchange experiment.;The first priority was a measurement of the Emittance Exchange beamline transport matrix. The method of difference orbits was used to measure the transport matrix. Through varying individual beam input vector elements, such as xin, x'in, yin, y'in, zin, or deltain, and measuring the changes in all of the beam output vector's elements, x out, x'out, yout, y'out, zout , deltaout, the full 6x6 transport matrix was measured. The measured emittance exchange transport matrix was in overall good agreement with our calculated transport matrix.;A direct observation of an emittance exchange was performed by measuring the electron beam's characteristics before and after the emittance exchange beamline. Operating with a 14.3 MeV, 250pC electron bunch, epsilon zin of 21.1+/-1.5 mm˙mrad was observed to be exchanged with epsilonxout of 20.8+/-2.00 mm˙mrad. Diagnostic limitations in the epsilonz out measurement did not account for an energy-time correlation, thus potentially returning values larger than the actual longitudinal emittance. The epsilonxin of 4.67+/-0.22 mm˙mrad was observed to be exchanged with epsilonzout of 7.06+/-0.43 mm˙mrad. The apparent epsilonz out growth is consistent with calculated values in which the correlation term is neglected. |
