User:Darrell Bonn/Notebook/307L Lab book/lab 2 e over m

E/m

Equipment and Setup

There are thee power supplies for the e/m apparatus.

Power supply 1: powers Helmholtz coils (6-9V) set at 9V

electron gun has two power supplies:

Power supply 2: powers electrodes (150-300V) set at 200V for initial value of accelerating voltage

Power supply 3; powers heater (Do Not Exceed 6.3V) set at 6.1 V

Confirmed voltage on power supplies by checking their corresponding voltmeters.

Power supply 1 is a Soar DC power supply Power supply 2 is a Deluxe Regulated Power Supply from the Gelman Instrument Company Power supply 3 is a Soar DC power supply 7403 the multimeter we use to read the voltage being delivered to the electrodes is an Amp Probe the multimeter we use to read the current in the Helmholtz coils is a Fluke III true RMS Multimeter on the first day we had another multimeter hooked up to the heater, but we disconnected it when we re-wired everything and did not reattach it because it was not necessary, since we were not adjusting the voltage delivered to the heater over the course of the experiment and the display of the voltage on the power supply was suficient.

day 2

Constant Voltage data

Accelerating Voltage: 360, Coil I in amps: Radius in cm 1.22 3.4 5.2 3.8 5.2 1.32 3.4 5.1 3.6 5.0 1.42 3.0 4.7 3.3 4.7 1.52 2.9 4.5 3.5 4.4 1.62 2.9 3.9 3.0 4.0 1.72 2.4 3.5 3.0 3.7 1.27 3.5 5.2 3.5 5.3 1.37 3.4 5.0 3.4 4.8 1.47 3.2 4.8 3.5 4.5 1.57 3.0 4.3 3.3 4.4