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C ommissioning plan for UED@ASTA

C ommissioning plan for UED@ASTA. Renkai Li 5/20/2014 ALD UED@ASTA Review. Outline. Pre-operation preparation Commissioning plan Machine operation and e -beam characterization Transverse overlap of laser and e -beam T emporal overlap of laser and e -beam Summary .

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C ommissioning plan for UED@ASTA

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  1. Commissioning plan for UED@ASTA Renkai Li 5/20/2014 ALD UED@ASTA Review

  2. Outline • Pre-operation preparation • Commissioning plan • Machine operation and e-beam characterization • Transverse overlap of laser and e-beam • Temporaloverlap of laser and e-beam • Summary

  3. Pre-operation preparation • Checklist • Safety • Training • Trigger and timing • Equipment protection • Modulator, klystron, LL and high power rf • Alignment • rf gun • Laser • Magnets and power suppliers • Motors/actuators • Cameras • Diagnostics • Data management • Software UED@ASTA preparation checklist

  4. Pump-probe control and data acquisition delay stage Computer S1 S2 > 100 M/s BS D2 D1 C2 1 1 1 EMCCD e-beam sample gun control trigger Shutter S1/S2 control To be built and tested off-line. Sample holder delay stage acquire photodiode D1/D2 transfer Virtual pump Camera C2 Computer EMCCD

  5. Commissioning plan • Laser optics installed by July 15th • Beamline installation July 15th– July 31th • Aim to run e-beams starting from August 1stw/o sample chamber

  6. Machine operation and e-beam characterization • Most tasks ready by August 1st • Safety • Training • Trigger and timing • Equipment protection • Modulator, klystron, LL and high power rf • Alignment • rf gun • Laser • Magnets and power suppliers • Motors/actuators • Cameras • Diagnostics • Data management • Software August 1st – 15th • Operation of the machine • e-beam energy, charge, spot size • Stability of e-beam parameters • shot-to-shot fluctuation • long-term (a few hours) stability August 15th - • Sample holder control • laser and e-beam transverse overlap • laser and e-beam temporaloverlap

  7. Transverse laser and e-beam overlap aperture (4-5 mm diameter) He-Ne steering coils laser screen e-beam SiN window (broken) SiN window stage screen camera Sample holder at UCLA

  8. Temporal laser and e-beam overlap 2000 mesh TEM Grid -8 ps -4 ps 0 ps 400 fs step size Steps to find time-zero 1) Fast photodiode D1 and D2 (< 100 ps or 3 cm) 2) Measure the rest of optical path length (~1 cm) 3) time-of-flight of the e-beam (from simulation) 4) Ultrafast plasma lensing effect (<1 ps) 4 ps 8 ps 12 ps L0 16 ps 20 ps 28 ps up to ~50 J/cm2 3 MeV beam L J. R. Dwyer et al., Phil. Trans. R. Soc. A 364, 741 (2006) H. Park et al., RSI 76, 083905 (2005) C. M. Scoby et al., dx.doi.org/10.1016/j.ultramic.2012.07.015

  9. Summary • Pre-operation preparation (checklist, now – August 1st) • Machine operation / e-beam characterization (August 1st - ) • Transverse overlap of laser and e-beam • Temporaloverlap of laser and e-beam • Experiment using samples with ultrafast (100 fs) response Thank you!

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