Presentation on theme: "SLAC UED/UEM Initiative and"— Presentation transcript:
1 SLAC UED/UEM Initiative and UED@ASTA Accelerator Directorate Review onX.J. Wang- May 20, 2014
2 Fundamental Probes in the BES ParameterElectronNeutronPhotonCharge✔Magnetic MomentMassSpinPolarizationForceElectrostaticNuclearElectromagneticSamplesThinThickMedium_Users desire to use different probes to obtain complementary info on samplesElectrons & x-rays see electrons and proton, while neutrons can see nuclei
3 SLAC UED/UEM iniIs also well aligned with the DOE mission – that is to develop state of art intrumentation
4 DOE BES Future Electron Scattering and Diffraction Workshop A – Multidimensional Visualization of Real MaterialsB – Atomic Scale Molecular ProcessesC - Photonic Control of Emergence in Quantum MaterialsD - Evolving Interfaces, Nucleation, and Mass TransportUltrafast Electron Diffraction and Microscopy FacilityB.1 – Source (MeV) and Electron Optics:B.2 - Pump Technology
5 The UED-UEM initiative at SLAC/Stanford Vision: The SLAC UED/UEM facility will be the world leading electron scattering instrumentation facility, complementary to the LCLS X-ray FEL. The UED/UEM facility will possess unique capabilities that enable Grand Challenge science in chemistry, material science, physics and biology. The availability of intense THz, X- ray and optical laser pumping in conjunction with UED/UEM probes will open new scientific opportunities.THzelectronbeam
6 SLAC Lab Agenda (2014) X-Ray THz What is make the UED/UEM uniques Two things.One is uniques capble. And other is the broad user community.
8 Ultrafast (< 10 ps) imaging only possible at higher voltages Point Spread Function at 200 keV, 1 ns50 nm100 nm-50 nm-100 nmPoint Spread Function at 5 MeV, 10 psFor picosecond resolution imaging, relativistic energies may be the only way to obtain high spatial resolution.M. R. Armstrong, B. W. Reed, B. R. Torralva, and N. D. Browning, Appl. Phys. Lett. 90, (2007).
9 Large Scattering Signal R.Valle et al, Ultramicroscopy 27, 67 (1989)
14 Ultrafast Electron Imaging (UEM) LaserOPA / THZSynAxiconUV OpticsRFProjectorRF GunLensCondenserObjectiveSampleDetector
15 UED @ ASTA? ASTA the most favorable site for fast impact experiments, There are three potential sites at SLAC could be considered for the first phase of UED. Those three sites are ASTA, NLCTA and LCLS II injector.ASTA the most favorable site for fast impact experiments,Existing RF gun and infrastructure.Laser system.Synergy with LCLS cathode R&D – thermal emittance reduction.X-band for beam diagnosticsConcerns:Impact to existing program: LCLS cathode R&D, semi-conductor cathode, and X-band testing programSpace and environment (temperature and vibration)safety (laser and radiation), budget and resource (manpower).Others
19 UED@ ASTA Objectives FY14 First 100 Femto-second MeV UED at high rep rateOrder of magnitude improvement (120 Hz vs 10 Hz)MeV UED Ultrafast ScienceFY14FePt2nmheat sinkGoal: understand & control materials processes related to heat-assisted magnetic recordingUnderstand and quantum control of chemical reactions.Structure of intermediate states
22 Challenges in UED @ ASTA Time and resourceInfrastructure upgrade – ASTA bunker space and laser room air conditioningTechnical challenges:Electron beam line ( diagnostic, sample chamber and detector)Laser RF synchronizationLow level RFKlystron modulatorLaser transport and pump-probe optics
24 ALD Review on UED@ASTA Agenda Start End Time Title Speaker8:00 8:30 0:30 Executive session 8:30 8:40 0:10 Welcome and charge to the committee Bob Hettel8:40 9:10 0:30 SLAC UED/UEM Initiative and XJ Wang9:10 9:30 0:20 Science enabled by the UED/UEM and early science at ASTA Hermann Durr9:30 9:50 0:20 project plan and ES&H Carsten Hast9:50 10:05 0:15 beam line and mechanical layout Eric Bong10:05 10:20 0:15 Coffee break 10:20 10:50 0:20 Beam Dynamics study Juhao Wu10:40 11:00 0:20 RF power stability Minh Nguyen11:00 11:20 0:20 LLRF and timing triggers Stephen Weathersby11:20 11:40 0:20 Laser-RF timing and synchronization Joe Frisch11:40 12:00 0:20 UED laser transport and pump-probe optics Ryan Coffee12:00 12:20 0:20 UED commissioning Renkai Li12:20 01:15 0:45 Lunch and discussion 01:00 01:45 0:45 ASTA tour Bldg. 4401:45 03:30 2:00 Executive session, report preparation + additional questions 03:00 Coffee 03:30 04:30 0:30 Close-out
25 SummaryThe SLAC UED/UEM facility will be the world leading electron scattering instrumentation facility, complementary to the LCLS X-ray FEL. The UED/UEM facility will possess unique capabilities that enable Grand Challenge science in chemistry, material science, physics and biology. The availability of intense THz, X-ray and optical laser pumping in conjunction with UED/UEM probes will open new scientific opportunities.will be the first step toward SLAC UED/UEM facility, it will be the first UED breaking 100 fs barrier and enable some exciting science. We have a realistic plan to realize the first experimental in FY 2014.