Development of Cs-Free Negative-Ion Source by Sheet Plasma

The Plasma Sheet Source Groove

A test particle study of the ionospheric source of plasma in the EarthÕs plasma sheet has been performed, in an effort to understand an apparent inconsistency between the results of forward and backward (in time) test particle calculations. Most if not all forward calculations of polar wind ion outflows result in energetic plasma sheet ion populations; yet most if not all backward trajectory ca...

Ion-Source Modeling and Improved Performance of the CAMS High-Intensity Cs-Sputter Ion Source

The interior of the high-intensity Cs-sputter source used in routine operations at the Center for Accelerator Mass Spectrometry (CAMS) has been computer modeled using the program NEDLab, with the aim of improving negative ion output. Space charge effects on ion trajectories within the source were modeled through a successive iteration process involving the calculation of ion trajectories throug...

Temporary negative-ion states of Na, K, Rb, and Cs.

Plasma polyamines determined by negative-ion chemical ionization/mass spectrometry.

We have developed an accurate and highly sensitive gas-chromatographic/mass-spectrometric procedure for determining di- and polyamines (putrescine, spermidine, and spermine) in plasma and erythrocytes. Deuterium-labeled analogs of putrescine, spermidine, and spermine were synthesized for use as internal standards. Trifluoroacetyl derivatives of the polyamines were formed during the procedure an...

Selective Heating of Helium Ion in Magnetized Sheet Plasma

Ion cyclotron resonance heating in the magnetized sheet plasma is studied experimentally in a linear plasma device, TPD-SheetIV. We have demonstrated the ICRH of the helium or helium/hydrogen mixture sheet plasma by the RF electrodes of two parallel plates, sandwiching the sheet plasma. Measurements of the ion temperature in the plasma were carried out by a Faraday cup. In addition, the ion den...