40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Message ID: 3234     Entry time: Fri Jul 16 12:36:00 2010
Author: Katharine, Sharmila 
Type: Update 
Category: elog 
Subject: levitation 

After last night's challenge (or inspiration), we levitated our magnet this morning.  Since the nice Olympus camera is not currently in the 40m, we had to use my less stellar camera, but despite the poor video quality you can still see the magnet returning to its stable equilibrium position.  Once we recover the better camera, we will post new videos.  Also, we haven't yet figured out how to put videos in line in the elog entry, so here are the youtube links:

 

levitation 1

levitation 2

 

We adjusted the gain on coil 1 so that the resistance from the pots was 57.1k (maximum gain of 101.2,).

currents from power supply, pre-levitation: 0.08 A and 0.34 A

post levitation: 0.08 A and 0.11 A


note: we're not sure why changing the gain on coil 3 changes the current through the power supply, so we'd like to investigate that next.

Attachment 1: CIMG0649.AVI  19.548 MB
ELOG V3.1.3-