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CAARI Lab 00

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Published on October 12, 2007

Author: Nivedi

Source: authorstream.com

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The Nobel Laboratory Experiments Revisited:  The Nobel Laboratory Experiments Revisited Richard J. Smith Physics Department Montana State University Bozeman MT 59715 Introduction:  Introduction What is the Nobel Laboratory Series of experiments? Format and content of some NLS labs Observations of what has worked and changes made in past 10 years Some new experiments and the future The Nobel Laboratory Series:  The Nobel Laboratory Series Upper division laboratory Experiments based on recent Nobel prize-winning work Major new equipment purchased through the NSF-ILI program (1990) Take advantage of department “experts” in various research areas The NLS Experiments:  The NLS Experiments High Temperature Superconductivity (K.A. Muller and J.G. Bednorz 1987) Scanning-Tunneling Microscopy (G. Binnig and H. Rohrer 1986) Nuclear Reactions and Nucleosynthesis (W.A. Fowler 1983) Electron Spectroscopy (K.M. Siegbahn 1981) The NLS Experiments - cont.:  The NLS Experiments - cont. Non-linear Optics (N. Bloembergen 1981) Laser Spectroscopy (A. L. Schawlow 1981) Magnetism and the Quantum Nature of Solids (J.H. Van Vleck, N.F. Mott, P.W. Anderson 1977) Nuclear Reactions and Nucleosynthesis:  Nuclear Reactions and Nucleosynthesis Experiment: Study the nuclear reactions Li7(p,)He4 and F19(p,)O16 Physics: collision kinematics, reaction cross section, energy loss for ions in solids and energy straggling, resonant reactions Equipment: 2MV van de Graaff accelerator, solid state particle detectors, pulse counting electronics and MCA, vacuum hardware MSU Ion Beam Laboratory:  MSU Ion Beam Laboratory 2 MV van de Graaff Accelerator:  2 MV van de Graaff Accelerator NRA and RBS Target Chamber:  NRA and RBS Target Chamber NLS Experiments: Format:  NLS Experiments: Format Example: Nuclear Reactions Lab Week 1: Introductory lectures (2 or 3) Students run a “calibration” experiment to become familiar with the equipment; reading and homework Example: 210Po source and Al stopper foil NLS Experiments: Format:  NLS Experiments: Format Example: Nuclear Reactions Lab Week 2: All students run a standard experiment Ex: study the kinematics of the p, reaction in a LiF target at one scattering angle and two different accelerator beam energies get familiar with operation of the van de Graaff accelerator and data analysis NLS Experiments: Format:  NLS Experiments: Format Example: Nuclear Reactions Lab Weeks 3&4: Expand the standard experiment or carry out a new experiment Ex: Measure the reaction cross section for the F resonance; measure the dependence of the reaction products on incident kinetic energy for F- and Li- derived ’s oral presentations in class Comments: Things that work well:  Comments: Things that work well 4-hour lab session each week Open-ended experiments Opportunity for student design of experiment Oral presentations in Weeks 2, 3, and 4 Weekly, short written reports Occasional long, complete reports Groups of 2 or 3 students …More things that work well:  …More things that work well Lab manuals tailored to our experiments 4 experiments per semester (4 weeks each) Access to department experts Support for other programs high-school teachers (STIR) 2- and 4-year faculty enhancement workshops (2) MS in Science Education for high-school teachers Senior Capstone projects Comments: Things that need fixing:  Comments: Things that need fixing Safety in the lab “Too much work” for a 2-credit course “Too much software”: PC instrumentation Limited design experience for students Too expensive for small department NSF: $90K; MSU: $90K; Physics $30K More faculty involvement High maintenance costs (optics,vacuum hdwr) Acknowledgements:  Acknowledgements People: Robert J. Swenson John Carlsten Rufus Cone John E. Drumheller Gerald J. Lapeyre Hugo Schmidt Richard J. Smith Students and visitors Funding: NSF Grant No. DMR-8952165 Examples of Student Projects:  Examples of Student Projects STM study of Au particles on graphite STM study of ion impact craters on graphite ERDA for hydrogen analysis in Ti-Mo alloys AES analysis of S-O interaction on Ti surfaces Significant changes in recent years:  Significant changes in recent years Drop the experiments using high power lasers safety and damage to optical components Increase course credit to 4 semester credits Add more optics labs Initiation of capstone experience at MSU New experiments:  New experiments Gaussian Beam Propagation Longitudinal Modes of He-Ne Laser Index of Refraction of Gases using an Acousto-optic Modulator Pockels effect using Frequency Doubling Electro-optic modulation (KD2PO4) New experiments: Pockels Effect:  New experiments: Pockels Effect Reference: “Frequency doubling electro-optic modulation system for Pockels effect measurements: application in LiNbO3”, N.G. Theofanous et al., Rev. Sci. Instrum. 68 (5) May 1997 Modified for KD2PO4 Pockels Effect using FDEOM:  Pockels Effect using FDEOM Pockels Effect using FDEOM:  Pockels Effect using FDEOM Waveforms on and off the frequency doubling position

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