Virtual experiments for teaching and training by pptfiles

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									Virtual experiments in University teaching
Kim Lefmann MCNSI public, ISIS, 27/9-05

New University neutron course
• University of Copenhagen, 4th year physics (+Ph.D.) • 10 hours per week, 8 weeks • Lecturers: Kim Lefmann, Peter Willendrup, Bente Lebech, Kell Mortensen • • • • • Theory (Squires) and simple calculation problems Data analysis (Fullprof, Mfit) 3 reports on McStas simulations (DMC, RITA-2, SANS-2) Plus 3 (6) full days experiments at PSI One final report, no exam

Course plan (week by week)
• 1: Introduction (neutrons + McStas), materials, Squires ch. 1 • 2-3: Scattering theory, (powder) diffraction, FULLPROF, DMC Project (crystal structure), Squires ch. 2-3 (elastic) • 4-5: Inelastic scattering, phonons, MFIT, RITA-2 project (phonons), Squires ch. 2-3 (inelastic) • 6-7: SANS, “SANS-software”, SANS-2 project, Notes • 8: Magnetic scattering, Squires ch. 7-8 • “9”: PSI experiments, (comparing with simulations)

Project 1: DMC (PSI)

• • • • • • •

PSI cold source Straight guide Flat monochromator Collimator Powder sample Banana detector (+ diagnostic monitors) • Data analysis in FULLPROF

Project 2: RITA-2 (PSI)
• • • • • • • • PSI cold source Straight guide Curved monochromator Soller collimator Vanadium / phonon sample Single analyzer Single detector (+ diagnostic monitors)

• Data analysis in MFIT

Project 3: SANS-2 (PSI)
• • • • • • • PSI cold source Straight guide Velocity selector Pinhole collimation (3/6 m) SANS sample PSD detector (+ diagnostic monitors)

• Simple data analysis (Gunier, Perot) • (right) Virtual data. Hard spheres, 50 nm,

Real experiments
• • • • PSI, 23-29 June 2005 2 groups of 3 M.Sc. students SANS-2 under repair RITA-2, 3 days each

• No repetition of simulations! • Spin wave projects (α-MnMoO4) • Data analysis in MFIT • Students very self confident even tough instrumentation (multi-analyzer mode)

Conclusion
• • • • • M.Sc. students like the approach (continue with neutrons) Excellent student reports! “hands-on” experience to instrumentation Students act experienced on Day-1 Better understanding for semi-experienced Ph.D. students

• Good beta-test of McStas 1.9! • Focused efforts to get virtual experiment concepts tested • This will be continued!


								
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