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The MAYBE (Microwave Air Yield Beam) Experiment is dedicated to the study of the microwave emission from particle beams in light of its possible use for the detection of ultra high energy cosmic rays. Measurements of the microwave emission were performed at the 3 MeV electron beam in the Van de Graaff facility at the Argonne National Laboratory. Results include the measured spectrum between 1 and 15 GHz, the polarization, and the scaling of the emission power with respect to the beam intensity. MAYBE measurements provide further insight on microwave emission as a detection technique for ultra-high energy cosmic rays. [ABSTRACT FROM AUTHOR]

We present an update on the development of a positron-facility at Argonne National Laboratory. We discuss the advantages of using a low energy electron accelerator, present our latest results on slow positron production simulations, and describe our plans for further development of the facility. We have installed a new converter/moderator assembly that is appropriate for our electron energy and increases the yield about an order of magnitude. We have obtained a Penning trap and buncher from Lawrence Livermore National Laboratory (LLNL) that we plan to install. We have simulated the relative yields of thermalized positrons as a function of incident positron energy on the moderator. We use these data to calculate positron yields that we compare with our experimental data as well as with available literature data. We will discuss the new design of the next generation positron front end utilizing reflection moderation geometry. [ABSTRACT FROM AUTHOR]