Benitez, J. Y.

Paper	Title	Page
MOCO-A02	Status Report and Recent Developments with VENUS	2
	D. Leitner, J. Y. Benitez, D. R. Dietderich, R. Hannaford, M. Leitner, C. M. Lyneis, S. Prestemon, D. S. Todd LBNL, Berkeley, California
	Since the superconducting ECR ion source VENUS started operation with 28 GHz microwave heating in 2004, it has produced record ion beam intensities such as 860 euA of Ar12+, 200 euA of U34+, or in respect to high charge state ions, 270 euA of Ar16+, 1 euA of Ar18+ and .4 euA of Xe42+. In August of 2006 VENUS has been connected to the 88-Inch Cyclotron as the third injector ion source extending the energy range and available heavy ion beam intensities from the cyclotron. This paper will highlight recent developments and results. In addition, the paper will give an update on the ongoing VENUS repair. Following an unexpected quench in January of 2008, the sextupole coils could not be energized. Most likely the quench was caused by the loss of liquid helium in the upper cryostat, which resulted in localized heating of the lead wire and consequent quenching. After opening the cryostat, it was found that one of the current carrying leads of the sextupole magnet was burned. The wire damage made it necessary to open the cold mass and extract the coil assembly for the repair. An update on the major undertaking of repairing the VENUS magnet and rebuilding the cryostat will be presented.
	Slides
MOPO-08	High Energy Component of X-Ray Spectra in ECR Ion Sources	77
	J. Y. Benitez, D. Leitner, C. M. Lyneis, J. D. Noland, D. S. Todd LBNL, Berkeley, California
	The 88-Inch Cyclotron at LBNL is home to three powerful ECR ion sources, which operate at a range of heating frequencies from 6.4GHz for the ECR to a combination of 18GHz and 28GHz for the VENUS superconducting ECR. Over the last few years we have investigated the production of x-rays from ECR ion sources with the goal of improving the understanding of the electron energy distribution within these sources. By measuring the spectral temperatures (defined as the reciprocal of the slope of the semi-logarithmic plot of the x-ray energy spectra) and using them as relative indicators of the electron temperatures, different plasma conditions and tuning parameters can be evaluated. A comparison of the axial x-ray spectra measured with the 6.4 GHz ECR ion source to spectra obtained using the 18 and 28GHz VENUS source at equivalent power densities will be presented. In addition, the paper will discuss the experimental setup and analysis of the x-ray measurements. In particular, we will discuss how to remove artifacts from the energy spectra resulting from the interaction of x-rays with the detector in order to accurately represent the x-rays emitted from the source.