HOME PROGRAM REGISTRATION HOTEL TRANSPORTATION SUBMIT ABSTRACT ABSTRACT LIST PROGRAM COMMITTEE MORE ON MADISON	Employment of Multiple Frequencies of Electron Cyclotron Resonance Heating on the Levitated Dipole Experiment Author: Hansen A.K. Coauthor: A.C. Boxer, J.L. Ellsworth, D.T. Garnier, I. Karim, J. Kesner, S. Mahar, M.E. Mauel, E.E. Ortiz, and Institution : Columbia University, visiting MIT PSFC Abstract text: During the initial plasma experiments in the Levitated Dipole Experiment (LDX), the dipole field coil is to be supported within the vacuum chamber rather than levitated. In this configuration some of the magnetic field lines intersect the supports, which is expected to set the particle loss rate. Such plasmas provide benchmarks against which those formed with a levitated dipole field coil (i.e. no end losses) may be compared. The initial plasmas in LDX will be formed and heated using electron cyclotron resonance heating (ECRH). The sources that are currently operational, 2.45 GHz and 6.4 GHz, can each apply up to 3 kW to generate the base-case hot-electron plasmas. By changing the amount of power in each source, we will be able to perform some crude profile studies. In addition, we have the capacity to do transient experiments by forming a plasma with one source and applying a pulse on the other. We can also chop the sources rather than applying CW power. We will employ the base-case diagnostics for these studies. The initial edge magnetic diagnostics set will be employed for fluctuation measurements as well as for equilibrium reconstruction, and includes flux loops, Hall probes, and Mirnov coils. The energy of the energetic electrons will be assessed witha multichannel X-ray pulse-height analyzer. A microwave interferometer will be used to measure the electron density. Electrostatic probes, including Langmuir probes and an emissive probe, will measure the equilibrium potential as well as its fluctuations. This work is supported by U.S. DOE Grants DE-FG02-98ER54458 and DE-FG02-98ER54459.