MA09 Detailed Manual

Temperature Sensors

• on sample stick: x22642
• on VTI heat exchanger: c17844
• common, very rough calibration for all Allen-Bradley test sensors: cplus70

Restrictions

Pending Issues

• The magnet seems not to work reliably with the lambda stage (2 quenches during an expt. in November 2006). The reason is not yet clear. A user claimed that the switch heater power is too low when using the lambda stage. It seems that this is not the case (see MA09switchHeater). A test in February 2007 showed no quench up to 9 Tesla. However, if we extrapolate the force measurements at 5 Tesla, we get forces near 1000 kN both vertically and horizontally (with shortened distance sample - mono). At normal distance, the horizontal forces are much lower, and the vertical forces should be reduced after replacing the A3 motor box.

• The magnet has a cold leak, occuring only occasionaly at low temperatures. As a workaround the main vacuum has to be pumped constantly. (Oct 2006)

Solved issues

• There seem to be a problem with the He level gauge. As a workaround, an additional gauge is placed in the He filling port. (2005-10-19) Solved in winter 2006.