Run 20 Capabilities

TMO capabilities for Run 20

The new Time-resolved Atomic, Molecular and Optical Science instrument (TMO) will provide access to the first Interaction Point (IP1) in Run 20. TMO is optimized to support AMO science, strong-field, and nonlinear science areas. A new variable gap undulator system will be used, providing horizontal polarization for photon energies from 250 eV to 2100 eV, with pulse energies expected to be in the 0.005 to 5 mJ range. In Run 20, TMO will operate with the 120 Hz copper accelerator. Ultra short pulses (XLEAP) should be available for user proposals. Proposals should target experiments using up to 120 Hz beam delivery.

Key Performance Parameters for Run 20

TMO will operate in Run 20 with the following performance parameters.   

 

Parameter

Value

Repetition Rate (Hz)

Up to 120, (1, 10, 30, 60, 120) 

Energy Range (eV)

250 - 2100

Pulse Duration (fs)

≤ 40; plus XLEAP capability (see below)

Spot size range, FWHM (um)

1.0 - 200

Polarization 

Linear, horizontal 

Single Pulse Energy (mJ)

Up to 5

Two Bunch, Two Color Mode

Available

Split Undulator

Available, includes XLEAP
Minimal delay depends on setup. 

 

XLEAP Parameter

Value

XLEAP Pulse Duration (fs)

≤ 0.6

Pulse Energy, single shot (µJ)

25 - 75 (single pulse), ~10 uJ /pulse for split undulator.

Bandwidth FWHM (eV)

4 - 8

w-2w

Available

The two pulse attosecond operation was successfully developed, the option to use attosecond pulse pairs will be availeble during Run 20. Users should assume added risk and prepare for extended tune up periods.  Note, that on soft X-ray two-pulse operation for Run 20, two pulse modes might be somewhat limited in delay range. Accessible delays will be between +5 fs and +1000 fs. Shorter delays are availeble on a best effort base.  For more information, please contact James Cryan (jcryan@slac.stanford.edu) or Peter Walter (pwalter@slac.stanford.edu).

 

Optical Laser Parameter

Value

Wavelength (nm) 

266, 400, 800, 1200 - 2300*

Pulse Duration at 800 nm (fs) FWHM

< 50

Repetition rate (Hz)

Variable to 120 Hz, shot on demand

Peak intensity on target  for 800 nm (W/cm2)

1014 

Variable energy attenuation factor (800 nm)

0 - 10

Polarization (2300 nm and below)

beamline y, beamline x, or circular

Focus diameter for 800  (um)

50 to 100 

“Goose” laser on-off trigger available

0-100% duty cycle

*IR wavelengths out to ~5 microns are possible in run 20, but depending on the pulse energy and bandwidth requirements this may require a separate laser setup that is not considered a standard configuration.  For more information on the available laser parameters, please contact Mike Glownia (jglownia@slac.stanford.edu) or Peter Walter (pwalter@slac.stanford.edu).

TMO spectrometers for Run 20 in IP1

For more information, please contact Peter Walter pwalter@slac.stanford.edu.

 

Multi-Resolution Electron Spectrometer Array (4x - 16x TOFs)

Ref:https://arxiv.org/abs/2103.07603

 

Standard Config 4x TOFs (more on a best effort base)

  • Gas targets introduced through gas needle
  • eTOF resolution 0.25eV over 75eV
  • single eTOF acceptance Angle 1.5° min - 3° max
  • Retardation Voltage 2000V max
  • Multi redardation feasible

Coaxial VMI 

Ref:  Cryan, J., et. al., (2018). A co-axial velocity map imaging spectrometer for electrons. AIP Advances, https://doi.org/10.1063/1.5046192

Standard Config:

  • Skimmed molecular beam source (1 skimmer), vertical orientation
  • Velocity Map Imaging Spectrometer MCP/Phosphor screen with CCD
    • Electrons: DE/E < 10%, max KE 600 eV

LAMP with the Magnetic Bottle 

For Run 20 TMO will provide a 2m long magnetic bottle electron spectrometer.

Standard Config:

  • Gas targets introduced through gas needle
  • 2m flight tube with retardation section, >50% collection efficiency
    • ​Resolution DE/E <5%
    • Retardation up to 200 eV
    • Ion extraction plate  

Kaesdorf (on a best effort base)

For Run 20 TMO can provide a ETF11B electron time of flight spectrometer. This can be attached to either LAMP or cVMI endstation, either in the interaction region or downstream.

Resolution: DE/E ~ 1%, 45 deg collection angle

 

Not Available in Run20

  • DREAM (IP2)
  • Double sided VMI in LAMP
  • Photon imaging detectors
  • Liquid jet in IP1