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SwissFEL

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Table of Content

Calls for Proposals

  • The PSI User Office invites user proposals for the first user run at SwissFEL.
  • SwissFEL is being continuously developed but the proposals must be based on the parameters outlined below on this page
  • After the submission deadline the proposals are evaluated in terms of safety and technical feasibility. Then they are ranked in terms of scientific criteria by the international SwissFEL Proposal Review Committee (PRC). More information about the evaluation procedure is published on Evaluation. The result of this rating is the basis for the beamtime assessment made by SwissFEL.
  • The main proposers are informed by email about the result of the ranking and beamtime assessment.
  • The annual calendar for the proposal evaluation is as seen below.

Schedule for Calls

We will open a call for proposals for SwissFEL on February 8, 2021. 

SwissFEL Call schedule
Experimental Period 2021-II
Call 08 February
Submission deadline 15 March
Start period 1 July
End period 31 December
EVALUATION
 
15 March - 30 April

Status of SwissFEL ARAMIS

Machine parameters

  • photon energy: 1.8-12.7 keV
  • typical bandwidth: 0.25% dE/E
  • typical pulse energies: 200-600 µJ
  • repetition rate: single shot - 100Hz
  • X-ray pulse duration: 50 - 100 fs fwhm
  • X-ray-laser arrival-time jitter:  < 150 fs fwhm (for time tool options see instrument sections)

Advanced machine modes with lower operation experience are available on a best effort basis.

These include

  • large bandwidth mode (up to 2%)
  • short pulses mode (20-50 fs fwhm)

Please contact the instrument teams for specific details that may help to enhance the technical feasibility of the proposed experiment. Note that the facility resource requirements may be important criteria in this call due to the concurrent buildup of the ATHOS soft X-ray branch.


Experimental Endstations

For the new run the Alvra and Bernina endstations are available with the following parameters:

Alvra Instrument

The Alvra end station of SwissFEL specializes in measuring the ultrafast dynamics of photochemical and photobiological systems using a variety of X-ray scattering and spectroscopic techniques. For the Alvra branch, the Alvra Prime chamber and Alvra Flex in-air instruments will be available with the following parameters.

 

For high time resolution experiments, a single pulse timing diagnostics can be used at pink FEL beam, at Si-111 monochromatic on best effort basis (please contact instrument responsible).

Alvra Prime
Photon energy range 2 keV – 12.4 keV, instrument fully commissioned over the full energy range
Beam profile
  • Measured focus <10 x 10 µm2 (fwhw) below 4.5 keV.
  • Measured focus  < 5 x 5 µm2 (fwhm) for energies > 6 keV
  • 1 x 1 µm2 (fwhm) achieved for 12 keV
  • Focus can be adjusted to meet experimental requirements
  • Unfocused beam: ~1 x 1 mm2 (fwhm) energy dependent
Bandwidth Monochromatic (Si(111), InSb(111), Si(311)) and pink beam (0.25% of fundamental); larger bandwidths of up to 2% are also possible (photon energy dependent)
Environment Vacuum (down to 5x10-4 mbar ) up to atmospheric pressure (He or N2)
Sample delivery Liquid jet:
  • Flat jet (100, 200 and 300 µm) with gear or peristaltic pump
  • Round jet (20-100 µm) with HPLC pump

LCP injector (50-100 µm)
Solid samples

GDVN operation possible for user-supplied and operated injector

Detectors and Spectrometers
  • 16M Jungfrau forward scattering detector at a fixed 10 cm sample-detector distance
  • 2 x 2 crystal von Hamos dispersive X-ray emission spectrometer (1-12.4 keV)
  • Diodes for integrated x-ray absorption measurements
Alvra Flex
Photon energy range 5 keV – 12.4 keV
Beam profile Focused 100 x 100 µm2 (fwhm) from design
Unfocused beam 1 x 1 mm2 (fwhm) energy dependent
Bandwidth Monochromatic (Si(111), InSb(111), Si(311; commissioning 2019) and pink beam (0.25% of fundamental)
Environment Normal atmosphere
Sample delivery Liquid jet:
  • Flat jet (100 µm to 250 µm) with gear or peristaltic pump
  • Round jet (20 µm to 100 µm) with HPLC pump
  • Solid samples
Detectors and Spectrometers
  • 3 crystal von Hamos dispersive X-ray emission spectrometer with 0.5 M Jungfrau detector (75 µm pixels) or 0.5M Stripsel Jungfrau (25 x 225 µm pixels)
  • Diodes for x-ray absorption measurements
Alvra experimental laser
Fundamental 800 nm, 35 fs (fwhm), 10 mJ (Ti:Sapphire)
Harmonics 800/400/266 nm branch available in parallel to OPA
OPA conversion 240 nm – 2.5 µm
Pulse energy at the sample position

Measured OPA pulse energies at the sample location vary with wavelength, ranging between 5 to 100 µJ. For specific pump wavelengths please inquire. Pulse durations are expected to be approximately 75 fs fwhm.

Harmonics branch allows for higher pulse energies at 800/400/266 nm with shorter pulse durations achievable. For current status please inquire.

Focus 50 x 50 – 500 x 500 µm2 (fwhm)

General information about the Alvra endstations can be found at: Alvra
For questions and further information about Alvra contact: Dr. Christoph Bostedt

Bernina Instrument

The Bernina Instrument is specialized on studying condensed matter systems by selective light excitation and selective resonant X-ray probes. It is equipped with flexible but precise positioning hardware for diffraction on solid state samples, but also larger user-supplied hardware. The instrument can interchange large endstations on rails transverse to beam direction. Two endstation platforms are  permanently installed, which can be configured for different sample and detector degrees of freedom for varying loads of sample environment or detection schemes:

  • X-ray Diffractometer (XRD), equipped with a two circle detector arm,
  • General Purpose Station (GPS), with a multi-purpose horizontal 2-theta arm.

Both endstations can be completed with different sample platforms that allow a large range of of specialized sample environment being precisely positioned:

  • Six degree of freedom (DOF) heavy load goniometer,
  • Two-circle surface diffractometer combination plus six DOF hexapod,
  • Kappa arm (6 DOF).

An additional 6 DOF robot arm can be used for flexible detector positioning.

For high time resolution experiments, a single pulse timing diagnostics can be used at Si-111 monochromatic and the pink FEL beam.

A newly commissioned Vacuum chamber sample environment is available for low sample temperature (down to 5K), high excitation THz field, and tender X-ray range experiments. It is advised to explore the compatibility of proposed experiments with the chamber geometry before proposal submission.

Bernina
Photon energy range 4 keV – 12.7 keV,  2 – 4 keV available at higher effort
Beam profile Focused down to 2x2 µm2 (fwhm, measured) to unfocused 1000x1000 µm2 (fwhm, photon energy dependent).
Bandwidth Monochromatic (Si(111) routinely used, InSb(111), Si(311) and pink beam (~0.2% of fundamental, transmissive single FEL pulse spectrometer available).
Environment He or ambient atmosphere, platform for user-supplied chambers, N2 and He based cryostream coolers down to ~80 K. Vacuum chamber available for low sample Temperature (<5 K), high field THz excitation, and tender X-ray range.
Sample systems

Solids: single crystals, powders, amorphous systems. Liquid/Gas only with user supplied equipment.

Detectors and Spectrometer
  • 1.5 M Jungfrau detector
  • 16 M Jungfrau detector
  • Diodes or single element (0.5 M) Jungfrau detectors for multi- purpose applications.
Bernina optical pump laser
Primary pump source    800 nm, 35 fs FWHM, 20 mJ (Ti:Sapphire)
Secondary pump sources Wavelength range Pulse energy / max. Field Pulse length Comments
240 – 400 nm      10 – 30 uJ (measured)   50 fs (fwhm)  
400 – 780 nm 150 – 500 uJ 50 fs (fwhm)  
1 – 2.5 µm 150 – 500 uJ 50 fs (fwhm)  
2.5 – 15 µm 5 – 30 µJ 250 fs (fwhm) Pulse length and energy depend highly on wavelength
~1 THz single cycle >300 kV/cm (measured) —  
0.5 – 2.5 THz >500 kV/cm (measured) —  

 

General information can be found at: Aramis Bernina Experimental Endstations
For questions and further information about Bernina, please contact: Dr. Henrik Lemke

 

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