P. Gueye

Status of the LILAC Experiment

We present the status of the LILAC experiment, including results on the propagation of 30-fs duration laser pulses in plasmas of the requisite density, and measurements of the dark current. We also discuss the status of a laser upgrade, an electron beam line and plans for the future.

Low divergence laser-plasma-based beams

We discuss the mechanisms, applications, and extraction of low-divergence laser-plasma-based electron beams that represent our past, current, and future research activities in the Center for Ultrafast Optical Science at the University of Michigan. We show experimentally that these beams have superior transverse emittance of 0.06 pi mm-mrad, along with nC charge, suitable for various applications, like pulse radiolysis. We also report progress in implementing a scheme to produce a monoenergetic electron beam, along with an electromagnetic QQQDD spectrometer system especially built for characterizing such a beam.

Excited baryon form factors at high Q2

The role of resonance electroproduction at high Q2 is discussed in the context of exclusive reactions, as well as the alternative theoretical models which are proposed to treat exclusive reactions in the few GeV2/c2 region of momentum transfer. Jefferson Lab experiment 94-014, which measured the excitation of the Δ(1232) and S11(1535) via the reactions p(e,e′p)π0 and p(e,e′p)η respectively at Q2∼2.8 and 4 GeV2/c2 is described, and the state of analysis reported.

Excited baryon form factors at high Q{sup 2}

The role of resonance electroproduction at high Q2 is discussed in the context of exclusive reactions, as well as the alternative theoretical models which are proposed to treat exclusive reactions in the few GeV2/c2 region of momentum transfer. Jefferson Lab experiment 94-014, which measured the excitation of the Δ(1232) and S11(1535) via the reactions p(e,e′p)π0 and p(e,e′p)η respectively at Q2∼2.8 and 4 GeV2/c2 is described, and the state of analysis reported.