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1) Project Identity Design of Magnetic Field Concentrators Week 1 Report Due Sunday April 10th 2010 Group D: Mohammedjuned Desai, Areio Hashemi, Koji Hirota, Michael Wong 2) Work Completed For this week we finally went over to the Robert M. Hardley Compnay. Ventura, CA, and finalized the design for the magnetic tweezers. The company was very professional and hoped to completed the design at minimum of two weeks. The above double magnet model simulation showed that the best orientation of two magnets is when the tips are flat and the two magnets are 1800 oriented from each other. However that was not our final design because if the two magnets are 1800 oriented from each other the coil will be in the way of the working area and as a consequence it would prevent the bead from getting close enough from the tip where the highest magnetic field gradient is located. In order to accommodate that problem we will have to angle (200) the two magnets so the coil no longer interferes with the bead while making a sharp tip (for each single magnet) so it still maintains a flat 1800 shape at the bottom when the two magnets are put together. Furthermore we worked on dividing up the sections to complete the first draft of our final magnetic tweezers report which was due last Friday. 3) Future Work After we obtain our design from the company we will be working on trying to determine the region of magnetic field where magnetic gradient is homogenous and thus has the higher strength. The way this will work is we will try to find a region that will produce a linear change in the derivative. After determination of this region, we will be able to perform calibration on the device to then determine velocity and then force measurements. 4) Project Review Over all this week went well, we went to the company and our device is being built as we speak. The wait time of two weeks is not bad at all during that time we hope to perfect our report and try to do some hand calculations regarding the magnetic field and wire length. Furthermore we finished our first draft of our report and will work on perfecting our power point for our next presentation. 1st Quarter Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 2nd Quarter Week 1 Week 2 Week 3 Goal Determine goal and objectives for the project Finalize the proposal Learn how to use FEMM, building models, producing results etc. Begin running magnet models Begin discussing and analyzing results Complete all the software models and analyzing the results Start ordering/gathering parts to begin fabrication Begin fabrication Attach the part to the microscope Have prototype/design already built Read up and familiarize ourselves with protocol on the calibration of the magnetic tweezers Being calibration Proper Placement of Mirrors/Objectives Completed X X X X X X X X X X X X Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 Finding Linear Region of the gradient field Focusing Camera for Viewing Bead Movement Calculating Velocity of Beads from Measured Distance and Time and use Stokes Equation to fine the Force Exerted on the Begin experimentation Take data from sample Compare data with published results Finalization of the product and calibration