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SLAC UED/UEM Initiative and X.J. Wang- May 20, 2014 Accelerator Directorate Review on

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Presentation on theme: "SLAC UED/UEM Initiative and X.J. Wang- May 20, 2014 Accelerator Directorate Review on"— Presentation transcript:

1 SLAC UED/UEM Initiative and X.J. Wang- May 20, 2014 Accelerator Directorate Review on

2 Fundamental Probes in the BES ParameterElectronNeutronPhoton Charge ✔ Magnetic Moment ✔✔ Mass ✔✔ Spin ✔✔✔ Polarization ✔✔✔ Force ElectrostaticNuclearElectromagnetic Samples ThinThickMedium _ Users desire to use different probes to obtain complementary info on samples Electrons & x-rays see electrons and proton, while neutrons can see nuclei Users desire to use different probes to obtain complementary info on samples Electrons & x-rays see electrons and proton, while neutrons can see nuclei

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4 DOE BES Future Electron Scattering and Diffraction Workshop 4 A – M ULTIDIMENSIONAL V ISUALIZATION OF R EAL M ATERIALS B – A TOMIC S CALE M OLECULAR P ROCESSES C - P HOTONIC C ONTROL OF E MERGENCE IN Q UANTUM M ATERIALS D - E VOLVING I NTERFACES, N UCLEATION, AND M ASS T RANSPORT Ultrafast Electron Diffraction and Microscopy Facility B.1 – Source (MeV) and Electron Optics: B.2 - Pump Technology

5 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. The UED-UEM initiative at SLAC/Stanford THz electron beam

6 6 SLAC Lab Agenda (2014) THz X-Ray

7 7 *base design - upgrade - blue sky R&D 18 months (2015) 2016 ~48 months (2019) SLAC UED/UEM Summary

8 For picosecond resolution imaging, relativistic energies may be the only way to obtain high spatial resolution. Point Spread Function at 200 keV, 1 ns 0 50 nm 100 nm -50 nm -100 nm Point Spread Function at 5 MeV, 10 ps 0 50 nm 100 nm -50 nm -100 nm Ultrafast (< 10 ps) imaging only possible at higher voltages M. R. Armstrong, B. W. Reed, B. R. Torralva, and N. D. Browning, Appl. Phys. Lett. 90, (2007).

9 R.Valle et al, Ultramicroscopy 27, 67 (1989) Large Scattering Signal

10 Pump-probe Velocity Mismatch 10 3MeV UED 60keV UED Δt VM > 1ps Δt VM < 10fs V e = 0.446c V e = 0.989c

11 R.F. Egerton et al. Micron 35 , 399 ( 2004) Sample Damage Knock on Pulse radiolysis Charging

12 RF Gun RF Laser Lens Syn UV Optics Ultrafast Electron Diffraction (UED) Sample Detector Axicon OPA / THZ La 0.5 Sr 1.5 MnO 4 : Orbit & Charge Orders MeV-UEDBNL TEM

13 RF Gun RF Laser Lens Syn UV Optics Ultrafast Electron Diffraction (UED) Sample Detector Axicon OPA / THZ Condenser & Nano-UED

14 RF Gun RF Laser Lens Syn UV Optics Ultrafast Electron Imaging (UEM) Sample Detector Axicon OPA / THZ Condenser Objective Projector

15 ASTA? 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 diagnostics Concerns: Impact to existing program: LCLS cathode R&D, semi- conductor cathode, and X-band testing program Space and environment (temperature and vibration) safety (laser and radiation), budget and resource (manpower). Others

16 The Accelerator Structure Test Area (ASTA)

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19 ASTA Objectives FY 14 FePt 2nm heat sink Goal: understand & control materials processes related to heat-assisted magnetic recording First 100 Femto-second MeV UED at high rep rate Order of magnitude improvement (120 Hz vs 10 Hz) MeV UED Ultrafast Science Understand and quantum control of chemical reactions. Structure of intermediate states

20 Early Physics: ASTA (FY14)

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22 Challenges in ASTA Time and resource Infrastructure upgrade – ASTA bunker space and laser room air conditioning Technical challenges: Electron beam line ( diagnostic, sample chamber and detector) Laser RF synchronization Low level RF Klystron modulator Laser transport and pump-probe optics

23 RF Gun Challenges in MeV-UED - Timing Jitter 23 RF Oscillator Laser RF Drive Sample Cathode Timing jitter Δt jitter =

24 ALD Review on Agenda StartEndTimeTitleSpeaker ​​​ 8:00 ​​ 8:30 ​​ 0:30Executive session ​ ​​​ 8:30 ​ 8:40 ​ 0:10 ​ Welcome and charge to the committee ​ Bob Hettel ​​​ 8:40 ​ 9:10 ​ 0:30SLAC UED/UEM Initiative and ​ XJ Wang ​​​​ 9:10 ​​ 9:30 ​ 0:20 ​ Science enabled by the UED/UEM and early science at ASTA ​ Hermann Durr ​​​​ 9:30 ​​ 9:50 ​ project plan and ES&H ​ Carsten Hast ​​​​ 9:50 ​​ 10:05 ​ 0:15 ​​ beam line and mechanical layout ​ Eric Bong ​ 10:05 ​​ 10:20 ​ 0:15 ​ Coffee break ​ ​​ 10:20 ​​​ 10:50 ​ 0:20 ​ Beam Dynamics study ​ Juhao Wu ​​ 10:40 ​ 11:00 ​ 0:20 ​ RF power stability ​ Minh Nguyen ​​​ 11:00 ​ 11:20 ​ 0:20 ​ LLRF and timing triggers ​ Stephen Weathersby ​​ 11:20 ​​ 11:40 ​ 0:20 ​ Laser-RF timing and synchronization ​ Joe Frisch ​ 11:40 ​ 12:00 ​ 0:20UED laser transport and pump-probe optics ​ Ryan Coffee ​ 12:00 ​ 12:20 ​ 0:20UED commissioning ​ Renkai Li ​ 12:20 ​ 01:15 ​ 0:45 ​ Lunch and discussion ​ ​ 01:00 ​ 01:45 ​ 0:45 ​ ASTA tour ​ Bldg. 44 ​ 01:45 ​ 03:30 ​ 2:00 ​ Executive session, report preparation + additional questions ​ ​ 03:00 ​ Coffee ​ ​ 03:30 ​​ 04:30 ​ 0:30 ​ Close-out

25 25 Summary n 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 n 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.


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