Specifications

The NEH 1.1 instrument will be configured to operate on the soft X-ray undulator (SXU) source with the following configuration requirements:

  • Fixed X-ray beam trajectory.
  • Ability to focus the beam into two separate interaction points (microfocus IP, nanofocus IP) where experimental endstations will be positioned.
  • Ability to efficiently change experimental endstations.
  • Ability to co-propagate an optical pump laser at both interaction points.
  • Ability to operate in the following hutch modes:
    • X-ray on mode with personnel exclusion
    • Class IV laser operation
    • Class I laser operation

X-rays

  • Superconducting Linac through soft X-ray undulator
    • 250 - 2000 eV
    • Up to 929 kHz
    • SASE pulse energy (100pC bunch charge): 
      • 0.4 mJ @ 250 eV -> 0.2 mJ @ 1300 eV w/o post saturation taper
      • 0.9 mJ @ 400 eV -> 0.7 mJ @ 1300 eV w/ post saturation taper
    • Max average power
      • SASE: 300 W @ 250 eV -> 200 W @ 1300 eV
      • Seeded: 95 W @ 250 eV -> 60 W @ 1300 eV
  • Copper Linac through soft X-ray undulator
    • 250 - 2500 eV
    • 120 Hz
    • SASE pulse energy: 2 mJ @ 500 eV -> 4 mJ @ 2500 eV 

Optical Laser

  • The laser will be temporally synchronized to the X-rays with <10 fs RMS jitter
  • Controllable on sample fluence up to 1015 W/cm2 at the rate of at least 100 kHz
  • <50 fs optical pulses for nonlinear wavelength conversion devices as needed
  • Provisions for <10 fs optical pulses on sample
  • Optical wavelengths from 200 nm to 17 microns
  • Pulse repetition rates from 120 Hz and 1 KHz to 1 MHz depending on the fluence and wavelength requirements
  • Remotely controllable position on the sample with 10 µm precision in NAMASTE and better than 2 µm in DREAM
  • Remotely controllable polarization on the sample
  • To focus laser beam into NAMASTE endstation an optical element with 700-1000 mm focal distance will be used, thus the appropriate location at the correct distance should be available for the optical element placement. The in-vacuum focusing mirror will be installed in DREAM to shorten the focal distance down to 70-150 mm

NAMASTE

  • Vacuum at the interaction region 10-9 - 10-4 Torr,
  • Target sample: gas jet, aerosol, liquid, solid. 

NAMASTE KBO Mirrors

Spec Value Unit
X-ray incidence angle 14 mrad
Shape Elliptical (multiple polished sections) -
Length 600 (550)  mm
Coating stripe width ≥ 10 mm
Number of stripes ≥ 4 -
Total mirror width ≥ 65 mm
Mirror gap ≤ 80  mm
Focal distance (from center of M2) <140 & ∞ mm

Charged Particles Detectors (MCPs)

Spec Value Unit
Read out rate
 
≥ 100
≥ 1
kHz
MHz
Quantum efficiency (Ion) ≥ 0.5 of ≥ 2 keV energy (1-1000 a.m.u. masses -
Quantum efficiency (Electron) ≥ 0.5 eV of 200 eV energy  
Energy resolution ≥ 104  
Time of flight resolution ≤ 250 ps
Dead time ≤ 5 ns
Single shot capability Yes  

High Speed Camera (e.g., for phosphor screens)

Spec Value Unit
Read out rate ≥ 10 kHz
Single line rad out ≥ 100 kHz
Pixels ≥ 60 x 2016, 512 x 2016  
Dynamic range ≥ 53 DB
Signal to noise ratio ≥ 40 DB
Quantum efficiency ≥ 40 %

DREAM

  • Vacuum at the interaction region 10-12 - 10-10 Torr
  • Target sample: gas jet, solid. 

Sub-micron Focus DREAM KBO Mirrors

Spec Value Unit
X-ray incidence angle 17.5 mrad
Shape Elliptical -
Length 360 (340)  mm
Coating stripe widths  ≥ 7  mm
Number of stripes  ≥ 2  -
Total mirror width  ≥ 30  mm
Mirror gap  20 mm
Focal distance (from center of M2)  ≤ 600  mm

Particle Momentum Imaging Detectors

Time-and-Coordinate Detector Specifications  Day one Long run
2D Position resolution 250 µm  ≤ 100 µm
Active area diameter (ion) 120 mm  >120 mm
Active area diameter (electron) 80 mm  ≥ 120 mm
Time-of-Flight resolution 500 ps  ≤ 100 ps
Multi-hit detector Yes  --"--
Pulse-pair resolution 10 ns  ≤ 3 ns
Quantum Efficiency 0.3 ≥ 0.7
Hits per event 10 ≥ 100
Event readout rate 50 kHz  1 MHz
Potential manufacturer Roentdek  

COLTRIMS

Electron collection solid angle 
Electron momentum angular resolution  <5º
Magnetic field value  0 - 30 Gs
Magnetic field uniform volume  150 mm x 250 mm x 150 mm
Electron energy range  0.1 - 40 eV
Electron energy resolution (∆E/E)  1/20
   
Ion collection solid angle 
Ion momentum angular resolution  <5º
Ion energy range (per 1 Coulomb of charge)  0.1 - 50 eV
Ion energy resolution (∆E/E)  1/50
Ion m/q resolution  1/50
Coincident electron/ion detection  Yes