Kerr - August 1, 2016

Today we learned a lot. Measurements within Magnetic field are not ideal as we are unable to pinpoint the strength of the field with the Kerr Apparatus.

The first measurement led us to the conclusion that the system was still faulty

• media:8_01earlymorningmeasurement.xlsx

Next we fastened the steel puck tightly with the holding device

• media:8_01tightpuck.xlsx

We created a new puck holding device and the Kerr signal followed a somewhat symmetrical path with only a .2 Volt (DC) decrease as opposed to a 2 Volt change in DC

• media:8_01tighterpuck..xlsx

We then moved the whole stage to a much farther distance from solenoid with smaller angle with a very clear signal

• media:8_01steelfaraway.xlsx

Seeing this signal, we measured a mirror with the same set up

• media:8_01mirrorfaraway.xlsx

Then the Molybdenum Puck, there was a large change in Voltage (DC) and a reversal of the sign of the slope making us suspect the puck to not be as fastened as the initial steel measurement. Not exactly sure how much I trust this measurement (may repeat it)

• media:8_01molyfar.xlsx

After the unexpected molybdenum behaviour, we measured the steel puck again to test the signal's repeatability

• media:8_01steel2faraway.xlsx

Important Facts about OLD (closer to Solenoid) Setup

1. Magnetic field at laser 450 -+25 Gauss
2. Magnetic Field at PEM (z-axis) 1200 +-25 Gauss, (x-axis) 50 +-25 Gauss, (y-axis) negligible
3. Photodiode (z-axis) 600 Gauss +-25, (x-axis) 300 Gauss, (y-axis) 20 +-10 Gauss
4. Angle 38.6 -+ 2.4 degrees (between laser and Photodiode)

Important Facts about NEW (farther) Setup

1. Laser, (z-Axis) 30 +- 10 Gauss, (x-axis) 10 +- 5 Gauss, (y-axis) Negligible
2. PEM z-axis 50 +-10 Gauss, (x-axis) negligible, y-axis negligible
3. Photodiode (z-axis) 30 +-10 Gauss, z and y negligible
4. Angle 5.31 +- .45 degrees (between laser and photodiode)