What's New at NEC

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June 2002 - May 2004

AMS Systems

Since our last update, NEC has been busy building machines for a wide variety of applications. However, Accelerator Mass Spectrometry (AMS) still dominates.

At the present time, there are nine Pelletron accelerator systems at various stages of manufacture at the NEC factory. In addition, there have been two more Pelletron charging chain conversions since our last update. The Model EN at Western Michigan University was completed in late 2003 and the FN conversion for Universitat zu Köln was recently shipped.

We have completed two additional AMS systems. One is a 3 MV tandem Pelletron based system for Laboratoire de Mesure du Carbone 14 at CEA in Saclay. That system demonstrated a background of 2 out of 1016 during factory tests. The second system is presently in use at the University of California - Irvine. This is one of NEC's compact AMS systems based on the 500 kV tandem Pelletron.

An additional six AMS systems are under construction at the NEC factory. One of these is our new single stage AMS system which uses an open air 250 kV deck. This is the first high-precision carbon AMS system not based on a tandem. It will be shipped to the Radiocarbon Dating Laboratory at the GeoBiosphere Science Centre at Lund University later this spring.

In addition to the AMS systems above, is another system which uses many of the basic principles of AMS for measuring oxygen isotopes. NEC is building the 1.2 MV tandem Pelletron and high energy analysis beam line for the MegaSIMS at the University of California at Los Angeles, Department of Earth and Space Sciences. This is part of the NASA Genesis Mission to measure solar wind oxygen isotopes.

New Applications

One of the more unusual Pelletron systems is the 3 MV electron Pelletron being built for the Sandia National Laboratory in New Mexico. This is part of their research into heating of supersonic airflow. The NEC portion of the electron accelerator consists of a small Pelletron housing electron gun and a second high voltage column containing the electronics. A capacitor bank is attached in order to provide a very intense pulse of electrons which is added to the supersonic region of the gas nozzle flow. Heating in this way produces a high mach number wind speed.

This special 9SH Pelletron produces intense electron pulses. The electrons exit to the far right. The pressure vessel to the left houses the terminal electron gun electronics and the center pressure vessel houses the capacitor bank.

There have been a number of special projects which involve developing a high current He- injector based on our TORVIS source, upgrade to the electron recirculator at Fermilab and a 15 keV ion source system to be attached to the Low Energy Electron Microscope (LEEM) at the University of Illinois, Urbana-Champaign, Department of Physics.

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Last revised August 24, 2005 by Tim Davis, webmaster@pelletron.com
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