User name X. Zheng
Log entry time 07:52:29 on June15,2001
Entry number 63213
keyword=Target - Helmholtz coil currentTwo plots for Helmholtz coil current:
Top: longitudinal coil current vs. runnumber;
Bottom: transverse coil current vs. runnumber;
Information about coil current (epics data for fluke multimeters) for runs before #1528 / #20528 is missing.
The current fluctuation (~1E-2) is much higher than what we had in EEL lab test (~1E-3). This helps to explain why the EPR resonance frequency changes all the time, but what causes the current change?
Another question: How much does the field (amplitude and direction) change due to the current fluctuation?
FIGURE 1
