Scientific Instrument HED

Current HED parameters for proposal preparation

  • Timeline and instrument parameters for upcoming call for proposals


The High Energy Density (HED) scientific instrument will be a new, unique platform for experiments combining hard X-ray FEL radiation and the capability to generate matter under extreme conditions of pressure, temperature or electric field using the FEL, high energy optical lasers, or pulsed magnets.

Scientific applications will be studies of matter occurring inside exoplanets, of new extreme-pressure phases and solid-density plasmas, and of structural phase transitions of complex solids in high magnetic fields. In July 2014, the Technical Design report for the HED instrument was published. The HED instrument experiment enclosure construction was completed in July 2014. Construction of the experimental hutches started in late 2015 and continued during 2016. X-ray and optical beamline components commenced in 2016, continued throughout 2017, and we foresee finishing the instrument installation in summer 2018. The first user experiment will start in 2019.

Key features (fully operational instrument, 2020)

Bandwidth ΔE/E

10-3  (SASE FEL source)

10-4  (standard Si-111 monochromator)

10-5  (x-ray self-seeding,, future option)

10-6  (at 7.49 keV, high-resolution Si-533 monochromator)

Photon energy range

5 – 20 keV (3 – 25 keV *)

*Limited in terms of focusing capability, available photon number of sample, quantum efficiency of detectors


Linear (horizontal)

Pulse duration

2–100 fs FWHM (depending on bunch charge)

Pulse energy

of order 1 mJ in SASE mode

Beam size on target

Provided by several compound refractive Be lenses (CRLs):

flexible from sub-µm foci to 1 mm collimated beam

Special optics

X-ray Split and delay Line (BMBF contribution)

Standard 4-bounce Si monochromator

High-resolution monochromator at 7.49 keV

Optical lasers

DIPOLE-100X High-energy (100 J-class) long pulse (1-15 ns) laser (HIBEF contribution)
High-intensity (multi-100 TW-class) short pulse (~30 fs) laser (HIBEF contribution)
Pump–probe (mJ to 100 mJ class) short pulse (15 fs – 1 ps) laser