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