Thermo-Cooler Controller

1. Thermo-Cooler Controller Kiefer, Mary, Molly, Sam

2. Update • We attempted the spectrum analysis • We learned that we weren’t getting a system response at frequencies over ~1Hz • Verified that our system is extremely low pass • Convinced us that our current model is accurate and doesn’t need revision • We were worried before that we weren’t accounting for high frequency poles of our system

3. Update (cont.) • We restructured our approach b/c with the old one, we had the potential of running into huge problems at the end • We now build-up to the final deliverable (get something working now and improve it) • We went up to the vacuum today ready to test our lag compensator • Realized we were missing two things: • Something to measure the difference between our current temperature and our set point temperature • The “driver” that takes this difference to control the signal • Solution: a difference amplifier circuit

4. Current Assignments • We’re meeting with Avi at 6:30pm tonight to verify our system design • Confirm the difference amplifier driver • Confirm our understanding/approach • After this meeting, we should be able to build our driver circuit and interface it to the compensator • We are optimizing Lead-Lag compensation • Compare these simulation results to the Lag results to decide if it’s worth implementing • Researching how to build the Lead-Lag compensation in hardware so we’re ready when we make a decision