Materials Research in the LERF User Labs

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Presentation transcript:

Materials Research in the LERF User Labs Michael J. Kelley College of William & Mary and Jefferson Lab mkelley@jlab.org

Materials R&D Lab Concept and Mission Precise energy delivery for materials modifications - Wavelength, location, fluence, time, etc. Unique light sources, some deployable - FEL (IR, UV), ps lasers, ns lasers, UV lamps Application devices - Laser micromachining system, Pulsed laser deposition system What has been/could be done - Polymer surface chemical modification – synthetics, renewables - Laser polishing, Laser nitriding, PLD for organics

Sharp surface roughness enhances magnetic field concentration, promoting energy loss Chen Xu dissertation

Light BCP AFM PSD Liang Zhao dissertation

Why Nitride the Niobium Surface? Presently Nb SRF cavities operate near 1.9 K, well (and expensively) below the 4.2 K atmospheric boiling point of liquid He. Forming the active interior surface from  NbN (Tc  17 K) vs the present Niobium (Tc  9.2 K), would reduce cryogenics cost and simplify the engineering design. Enable 4.2 K operation Conventional furnace nitriding does not produce superconducting delta phase NbN.

Nitriding Experiment Laser parameters: Wavelength : 1064 nm Repetition rate : 15 – 30 KHz Pulse width : 15 ns Fluence : 1.1 – 4 J/cm2 Treatment parameters: N2 pressure : 500 – 625 torr Target rotation : 9 rpm No. of pulses overlap/area on each circle : 40 - 200 Raja Singaravelu dissertation

Laser heating : Simulation Raja Singaravelu dissertation Surface temperature profile for niobium for various laser fluences (for single pulse – pulse width = 15 ns)

X-Ray Diffraction Raja Singaravelu dissertation

Polymer PLD experiment Cyclic Olefin Copolymer - COC Uses: High transparency and gloss High heat resistance upto 1780 C Resists acids and alkalis Excellent moisture and aroma barrier Excellent biocompatibility n,m = repeat units R1, R2, R3 = -CnH2n+1 Free electron laser parameters: 60Hz, 250 us, 4MHz, 3.4 m Raja Singaravelu dissertation

that use our capabilities We seek opportunities for collaborations that use our capabilities mkelley@jlab.org

Special thanks to the students who did the work Lopamudra Das – W&M Raja Singaravelu – ODU Liang Zhao – W&M Zhengmao Zhu – W&M