MeV-UED Endstations
The SLAC UED system supports multiple sample chambers optimized for different types of sample delivery. Please note that not all endstations may be available for the current general User Program.
MeV-UED Solid State (Materials) & Warm Dense Matter (Single Shot) | |
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Sample motion | 5-axis sample motion |
Sample Cooling | 30 - 300 K |
Diagnostics | Frosted YAG for electron/laser overlap |
Sample mounting | TEM mesh grids |
Vacuum | <1 x10-7 Torr |
MeV-UED Gas Phase Endstation | |
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Sample Temperature Range | Sample reservoir: RT - 50 °C (flow cell) & RT - 150 °C (pulsed nozzle) |
Sample Vapor Pressure Requirement | > 100 torr at 150 °C for pulsed valves |
Sample Reservoir Size | 100 mL (e.g. standard 2.75 CF nipple) |
Buffer Gas (optional) | Helium, 5 bar for Parker general valve |
Nozzle Properties | Pulsed, up to 180 Hz |
Gas Jet Size (FWHM) | 200-400 µm |
Nozzle motion | 3-axis translational motion |
Cold Trap Temperature | < 100 K |
Diagnostics | Frosted YAG for electron/laser overlap |
Pump-probe propagation angle | ~2° |
Vacuum | Operation condition: |
Gas Line Material | Stainless Steel |
Nozzle Puppet/Seal Materials | Vespel (Parker general valve; series 9) |
Flow cell materials | (1) Stainless steel (2) Macor ceramic |
Q range | 0.5 to 12 Å-1 |
Q resolution (FWHM) | 0.17 Å-1 |
Time resolution (FWHM) | 150 fs |
Pump Wavelength | 200 nm, 266 nm, 400 nm, 800nm, 240 nm - 2 µm tunable |
Delay Stage Range | 2 ns |
Delay Stage Resolution | 7 fs |
MeV-UED Liquid Phase Endstation | |
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Sample Delivery | Converging sheet jet
Gas Accelerated Jet – contact for details |
Recirculation | Yes, volume required > 50 mL (> 500 mL recommended) |
Nozzle motion | 3-axis motion: X, Y & Z |
Optical Pump Geometry | Collinear or 30 degrees to sheet normal |
Samples | Neat liquids & Solutions
Solutes that are easy to come out of solution below 0 ℃ are not favorable due to clogging. |
Reference Material | J. P. F. Nunes, K. Ledbetter, M. Lin, M. Kozina, D. P. DePonte, E. Biasin, M. Centurion, C. J. Crissman, M. Dunning, S. Guillet, K. Jobe, Y. Liu, M. Mo, X. Shen, R. Sublett, S. Weathersby, C. Yoneda, T. J. A. Wolf, J. Yang, A. A. Cordones and X. J. Wang, "Liquid-phase mega-electron-volt ultrafast electron diffraction", Struct. Dyn. 7, 024301 (2020) doi: 10.1063/1.5144518 |
MeV-UED Contacts
Alex Reid
MeV-UED Facility Director & Instrument Lead
(650) 926-7467
alexhmr@slac.stanford.edu
Joel England
MeV-UED Accelerator Lead
(650) 926-3706
england@slac.stanford.edu
Stephen Weathersby
Area Manager
(650) 926-3890
spw@slac.stanford.edu
Ming-Fu Lin
Lead Scientist
(650) 926-2586
mfucb@slac.stanford.edu
Matthias Hoffmann
Lead Laser Scientist
(650) 926-4446
hoffmann@slac.stanford.edu
Xinxin Cheng
Staff Scientist
xcheng@slac.stanford.edu
Patrick Kramer
Laser Scientist
(650) 926-5148
pkramer@slac.stanford.edu
Randy Lemons
Laser Scientist
(650) 926-3477
rlemons@slac.stanford.edu
Cameron Duncan
Associate Scientist
cjduncan@slac.stanford.edu
Fuhao Ji
Associate Scientist
(650) 926-4678
fuhaoji@slac.stanford.edu
Yusong Liu
Associate Scientist
yusongl@slac.stanford.edu
Aaron Garza
Staff Engineer
(650) 926-4282
aarongs@slac.stanford.edu
Ian Roque
Staff Engineer
(650) 926-3407
iroque@slac.stanford.edu
Tianzhe Xu
Research Associate
txu@slac.stanford.edu
Sharon S. Philip
Research Associate
sharonsp@slac.stanford.edu