Bulletin of the American Physical Society
Fall 2009 Meeting of the Four Corners Section of the APS
Volume 54, Number 14
Friday–Saturday, October 23–24, 2009; Golden, Colorado
Session H4: Industrial Applications of Physics |
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Chair: Chuck Stone, Colorado School of Mines Room: Green Center 263 |
Saturday, October 24, 2009 11:20AM - 11:44AM |
H4.00001: Listening to the Earth with Gravity Meters Invited Speaker: Gravity meters have long been used to gain static information about the earth. For example, gravity provides information about the shape of the earth for geodetic purposes as well as subsurface density anomalies that can be used to locate oil, gas, and other minerals. Gravity is also very sensitive to vibrations in the earth induced in the earth by earthquakes. Gravity meters can potentially detect seismic energy at lower frequencies than is possible with traditional seismometers. This talk will introduce and explain the differences between different types of gravity meters; from spring-based systems to absolute free-fall ballistic techniques. It will also describe how gravity can be used to monitor gas and water injections into reservoirs. Finally, we will show some new results of measurements with a new gravity meter, called the gPhone. The gPhone provides a complementary methodology for listening to the subtle bass tones excited by earthquakes at frequencies outside the bandwidth of traditional seismometers. [Preview Abstract] |
Saturday, October 24, 2009 11:44AM - 11:56AM |
H4.00002: Microwave-Assisted Magnetization Switching: Competition between Pumping and Damping Zihui Wang, Ke Sun, Wei Tong, Mingzhong Wu, Ming Liu, Nian X. Sun In the presence of microwaves, magnetization reversal in magnetic materials can be realized with relatively low magnetic fields. This effect is called microwave-assisted magnetization reversal (MAMR). This presentation reports for the first time (1) the demonstration of MAMR in large-damping materials and (2) the observation of a saturation effect for the enhancement in MAMR. The experiments were carried out on Fe$_{70}$Co$_{30}$ thin films with ferromagnetic resonance techniques. A reduction in the switching field was observed in the presence of microwaves. The level of such a reduction depends on the frequency and power of the microwaves. With increasing the microwave duration, the switching field decreases first but then approaches a lower-limit. This saturation of the switching field reduction was interpreted in terms of the pumping-damping competition. The interpretation was supported by the measurements of the switching field as a function of the microwave duration for different conditions. [Preview Abstract] |
Saturday, October 24, 2009 11:56AM - 12:08PM |
H4.00003: High Resolution Optical Scans of Pixelated Silicon Avalanche Photodiodes William Johnston, Robert Wilson Pixelated avalanche photodiodes are increasingly used in applications where photomultiplier tubes have previously been employed. These pixelated avalanche photodiodes have 100's of pixels which each act as a single-photon detector. A high-resolution optical scanner has been constructed that can measure the uniformity of response of different pixels, the uniformity of response across individual pixels, and crosstalk between pixels on a single device. This scanner features a micron-sized photon beam and is able to position the photodiode with micron level precision. Initial measurements performed on a Hamamatsu multi-pixel photon counter (MPPC) will be presented. [Preview Abstract] |
Saturday, October 24, 2009 12:08PM - 12:20PM |
H4.00004: Flyin' Ions: Simulated and Physical Testing of a Time of Flight Mass Spectrometer Nicholas Morrill, Todd King, Stephanie Getty, Mary Li, Steven Feng, Nick Costen, Larry Hess, Vincent Holmes, Dan Stewart, Greg Hidrobo, Cle Hunt, Inge ten Kate, Steve Cagiano, Will Brinkerhoff, Danny Glavin, Paul Mahaffy Development of a miniature time-of-flight mass spectrometer for NASA was aided by computational simulation via SIMION 8.0 {\copyright}. A novel electron source using carbon nanotubes for generation of ions was implemented. Over all design was compatible with micro-fabrication techniques. [Preview Abstract] |
Saturday, October 24, 2009 12:20PM - 12:32PM |
H4.00005: Demonstration of a high average power table-top soft x-ray laser at 13.9 nm Dale Martz, David Alessi, Yong Wang, Brad Luther, Mark Berrill, Scott Domingue, David Kemp, Jorge Rocca We have demonstrated a significant increase in the average power of table-top soft x-ray lasers at a wavelength of 13.9 nm. We present results of a Ni-like Ag amplifier operating at 2.5 Hz with a peak energy of $\sim $ 10 uJ per pulse. The results were obtained in a plasma generated by rapidly heating a solid target with 3-5J picosecond laser pulses from a titanium sapphire laser system. To obtain the increased average power of 20 uW, we upgraded our Ti:sapphire laser system with a high-energy Nd:Glass slab pump laser that can operate at a 2.5 Hz repetition rate. High repetition rate EUV lasers enable new applications in science and the development of unique metrology and processing tools for industry. The increase in the average power allows new applications of intense coherent soft x-ray light on a table-top. [Preview Abstract] |
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