December 16th, 1999, Madison, Wisconsin

Primary ion beam was seen during the MST discharge today!

Today is the run day for the hibp on the MST. A few modifications were made before today's run.

The results are quite positive. The beam signals can be seen very clearly on the detector plates. ( Here the detectors mean the two 10kV toroidal plates). Below is some typical results:

If the ion beam is assumed has Gaussian distribution profile, a simple calculation can be done to predict what the beam signals should look like on the 10kV toroidal plates when sweeping the beam toroidally. Click here to see the simulation result. Notice that if ignore the secondary electrons effect, the simulated results will nicely match the test results.