CERN ug thesis 2005 borrero free download

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A Low-Noise Current Supply for an Electron Electric Dipole Moment Experiment APPROVED BY: _______________________________ Daniel J. Heinzen, Supervisor _______________________________ Melvin E. L. Oakes, Honors Advisor A Low-Noise Current Supply for an Electron Electric Dipole Moment Experiment by Daniel Borrero Echeverry UNDERGRADUATE HONORS THESIS Presented to the Faculty of the Department of Physics of The University of Texas at Austin in Partial Fulfillment of the Requirements for SPECIAL DEPARTAMENTAL HONORS THE UNIVERSITY OF TEXAS AT AUSTIN May 2005 2 A Low-Noise Current Supply for an Electron Electric Dipole Moment Experiment Daniel Borrero Echeverry The University of Texas at Austin, 2005 Supervisor: Daniel J. Heinzen We designed and built a custom current supply for use in an electron electric dipole moment experiment. This supply will be used to drive a set of magnetic field coils in the experimental apparatus. Based on a design used at the University of California, Berkeley in earlier electron EDM measurements, our supply sources 140mA of current with a measured noise level of 16 nA Hz at 0.05 Hz, although this measurement may be too high due to the limitations of the measurement equipment. This noise level is consistent the desired level of precision ( 10 -29 e cm ) in the electron EDM measurement, but we believe that this noise level could be improved with further work. 3 Table of Contents Title Page ... 2 Abstract ... 3 Table of Contents ... 4 List of Figures ... 5 Background ... 6 Why an Electron EDM implies T-violation ... 6 T-Violation Experiment at UT ... 7