Calls for Proposals
- We call for proposals for the Alvra, Bernina, and Cristallina-MX instrument at the Aramis hard X-ray line and for the Maloja and Furka instrument at the Athos soft X-ray line. The branch lines and instruments are described in detail below.
- The new Cristallina-MX endstation offers capabilities for fixed target crystallography experiments
- The new Furka endstation is dedicated to the study of quantum materials using time-resolved Resonant Inelastic and Elastic X-ray Scattering (tr-RIXS and tr-REXS) as well as X-Ray Absorption (tr-XAS) spectroscopy
- SwissFEL is being continuously developed but the proposals must be based on the parameters outlined below on this page. Please take note of the updated beam parameters, reflecting the improved performance level of SwissFEL.
- For Aramis Alvra, we offer SFX beamtime slots in standard configuration.
- 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.
- Proposals can be submitted to the PSI User Office.
Schedule for Calls
We will open a call for proposals for SwissFEL in August 2023.
SwissFEL call schedule | |||
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Experimental Period | 01.01.2024 | ||
Call | 08.08.2023 | ||
Submission deadline | 15.09.2023 | ||
Start period | 01.01.2024 | ||
End period | 31.07.2024 | ||
EVALUATION |
15.09.2023 - 30.10.2023 |
Status of SwissFEL Aramis
Machine parameters
- photon energy: 1.8-12.7 keV
- typical bandwidth: 0.25% dE/E
- typical pulse energies: up to 1000 µJ
- repetition rate: single shot - 100Hz
- X-ray pulse duration: 50 - 70 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 (10-50 fs fwhm) with loss of pulse energies
Please contact the instrument teams for specific details that may help to enhance the technical feasibility of the proposed experiment.
Experimental Endstations
For the new run the Alvra, Bernina and Cristallina-MX endstations are available with the following parameters:
The Alvra instrument specializes in ultrafast dynamics in chemical and biological systems, especially in solutions, liquids, or crystals in viscous media. Alvra is equipped for X-ray spectroscopy (absorption and emission), liquid scattering, and serial femtosecond crystallography measurements, as well as flexible user-provided setups. In Alvra there are two endstations available, the Alvra Prime chamber (vacuum and He environment) and Alvra Flex (in air) in the parameters described below.
For high time resolution experiments, a single pulse timing diagnostics, for jitter and drift corrections, can be used with pink FEL beam and Si-111 monochromatic on best effort basis (please contact instrument responsible).
We offer short and dedicated SFX beamtime slots for experiments in the following standard configuration: X-ray photon energy of 12 keV with standard bandwidth, femtosecond laser excitation between 500 nm - 600 nm or at 800 nm and at best 100 fsec time resolution, Jungfrau 4M detector, LCP injector. The max. beamtime length is 3 days (9 shifts) including setup. Indicate in the abstract of your proposal if it should be considered for the new standard SFX beamtime and add a detailed beamtime plan in the experimental description.
Alvra Prime | |||
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Photon energy range | 2 keV – 12.4 keV, instrument fully commissioned over the full energy range | ||
Beam profile |
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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:
LCP injector (50-100 µm) GDVN operation possible for user-supplied and operated injector |
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Detectors and Spectrometers |
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Alvra Flex | |||
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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 |
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Bandwidth | Monochromatic (Si(111), InSb(111), Si(311; commissioning 2019) and pink beam (0.25% of fundamental) | ||
Environment | Normal atmosphere | ||
Sample delivery | Liquid jet:
Solid samples |
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Detectors and Spectrometers |
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Alvra experimental laser infrastructure |
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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. |
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Focus | 50 x 50 – 500 x 500 µm2 (fwhm) |
Fundamental | Tunable nanosecond OPO |
Wavelengths | 355 - 1000 nm |
Pulse Duration | 2.5 ns |
Pulse energy at the sample position |
5 µJ maximum |
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. Camila Bacellar
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. Both endstations can be completed with different sample platforms that allow a large range of of specialized sample environment being precisely positioned. An additional 6 DOF robot arm can be used for flexible detector positioning.
Endstation platforms
- X-ray Diffractometer (XRD), equipped with a two circle detector arm,
- General Purpose Station (GPS), with a multi-purpose horizontal 2-theta arm.
Sample platforms
- Six degree of freedom (DOF) heavy load goniometer,
- Two-circle surface diffractometer combination plus six DOF hexapod,
- Kappa arm (6 DOF).
New setups
- For low sample temperature (down to 5K), high electric field THz pulse excitation, and tender X-ray range experiments, a vacuum chamber sample environment is available . It is advised to explore the compatibility of proposed experiments with the chamber geometry before proposal submission. For details about the chamber please refer to https://doi.org/10.1088/1361-648X/ac08b5
- A newly commissioned Resonant Inelastic X-ray Spectrometer (RIXS) with spherical Si(844) diced analyzer crystals is available for this call. The spectrometer features a 1m arm following the Rowland geometry. Using the beamline double crystal Si-(333) monochromator, the reached energy resolution at the IR L-edge at 11.215keV is 130meV.
For high time resolution experiments, a single pulse timing diagnostics can be used at Si-111 monochromatic and the pink FEL beam.
Bernina | |||
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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. |
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Detectors and Spectrometer |
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Bernina optical pump laser | ||||
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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
The first endstation the Cristallina-MX project to be commissioned is called SwissMX (Serial WIth Solid-Support MX), a fixed-target endstation designed for high-throughput SFX and SFX pump-probe. SwissMX has been commissioned with an in-air sample environment since May 2022 and is now ready for users.
The SwissMX has currently only been commissioned to accept two styles of fixed-target: the PSI MISP (MIcro-Structured Polymer) and the MPI SOS (Sheet-On-Sheet) chip (Doak et al., 2018). The MISP-chip is composed of an array of apertures in defined locations in a similar style to the Oxford (Horrell et al., 2021) and HARE chips (Mehrabi et al., 2020). The MISP-chips can be fabricated in either a clear or an opaque polymer, with the only latter being compatible with pump-probe measurements. The SOS chip by comparison is made by carefully sandwiching a sample between two sheets of polymer film and are ideal for samples of limited volume in viscous media such as LCP. Liquid-crystal samples will need to be embedded in a moderately viscous medium to be used effectively. Please indicate in the DUO which chip or both you would like to use.
The SwissMX is capable of both SFX and nanosecond resolution SFX pump-probe measurements. The endstation can be fibre-coupled to an EKSPLA nanosecond OPO and the pump-probe measurements have been commissioned using the opaque MISP chips. Pump-probe is only possible using these chips.
Our standard SFX beamtime configurations are: X-ray photon energy of 12 keV with standard bandwidth (0.15 % SASE), nano-second laser excitation between 410 nm - 700 nm (if required), Jungfrau 8M detector and either MISP or SOS chips. Max beamtime length will be 2 days (6 shifts). Please indicate if you would only like 0.5/1 shifts for non-pump-probe SFX measurements.
SwissMX | |||
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Photon energy range |
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Beam profile |
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Bandwidth |
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Environment |
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Fixed-targets |
PSI MISP-chip
MPI SOS chip
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Detectors |
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Optical pump laser |
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General information can be found at the Cristallina-MX project page.
For questions and further information about Cristallina-MX, please contact: Dr. John Beale
Status of SwissFEL Athos
Athos beam parameters:
Standard SASE:
- Photon energies and pulse energies for circular polarization (linear polarization 30-40% less) :
- 350 - 1000eV with more than 2000μJ pulse energy
- 1000 - 1300eV with more than 1000μJ pulse energy
- 1300 - 1600eV with more than 250μJ pulse energy
- Typical bandwidth ≤ 1 %
- Repetition rate 100Hz
- Standard X-ray pulse duration ≤ 100fs FWHM
- Short X-ray pulses with tuneable pulse duration down to factor of x5 relative to standard SASE mode. Pulse energy directly proportional to pulse duration
- Polarization adjustable: Circular +/- (delivers highest pulse energy), linear horizontal, linear vertical
- Energy scan: feasible over +/- 10 % of fundamental energy
Advanced machine modes with lower operation experience are available on a best effort basis. These include:
- Two colour X-ray mode: Two X-ray pulses with independently tuneable photon energies up to 1000eV, maximum delay between the pulses is 500fs and minimum delay is -50fs.
Please note, that advanced modes will result in overall reduced machine performance, like lower repetition rate and reduced pulse energy as compared to standard SASE operation. In case you plan to submit a proposal which requires an advanced mode, we advice to consult with the endstation contacts beforehand.
The Maloja instrument specializes on studying ultrafast processes in atomic, molecular, non-linear and chemical sciences. The flexible setup allows for a variety of spectroscopy and imaging approaches. The following setups will be available for this call:
Setup | Configuration |
Time resolved XPS |
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Pink beam XAS |
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Ion momentum spectroscopy |
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Single shot single particle imaging |
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Beam profile |
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Optical laser |
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Natural jitter between X-ray and optical pulse ~150fs (FWHM), which can be improved with an arrival time monitor.
Restrictions for hazardous samples apply, please consult with the Maloja contact before submission in case you plan to use such substances.
General information about the Maloja endstations can be found at: Maloja
For questions and further information about Maloja contact: Dr. Kirsten Schnorr
The Furka experimental endstation, located at the soft x-ray Athos beamline of the SwissFEL, is dedicated to the study of quantum materials using time-resolved Resonant Inelastic and Elastic X-ray Scattering (tr-RIXS and tr-REXS) as well as X-Ray Absorption (tr-XAS) spectroscopy.
The endstation is equipped with at 4-circles UHV diffractometer (Tmin=25 K), a set of x-ray detectors (APDs) rotating on two independent circles around the sample and 6 meter long RIXS spectrometer (200 meV min energy resolution). Sample cleaving in the load lock (room temperature, vacuum 10-7 mbar) is available. The THz radiation is focused using a parabolic mirror mounted on a motorized manipulator (5 DOF) located inside the vacuum chamber.
Natural jitter between X-ray and optical pulses ~150fs (FWHM). For higher time resolution experiments, a single pulse timing diagnostics, for jitter and drift corrections, can be used (please contact instrument responsible for more info).
Furka | |
Setup | Configuration |
Time resolved XAS and REXS |
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Time resolved RIXS |
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Furka | |
Beam profile |
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Enviroment |
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Furka optical pump laser | ||||
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Primary pump source | 800 nm, 35 fs / 100 fs FWHM, 20 mJ (Ti:Sapphire) | |||
Secondary pump sources with 35 fs 800 nm pulses |
Wavelength range | Pulse energy / max. Field | Pulse length | Comments |
400 nm | 200 uJ (measured) |
~ 50 fs (fwhm) | — | |
266 nm | 30 uJ (measured) |
~ 50 fs (fwhm) | — | |
Secondary pump sources with 100 fs 800 nm pulses |
240 – 780 nm | 10 – 350 µJ | ~ 100 fs (fwhm) | Pulse energy depends highly on wavelength, for more information please contact the instrument responsible. |
1.2 – 2.5 µm | 200 – 500 µJ | ~ 100 fs (fwhm) | ||
~1 THz single cycle | Up to 300 kV/cm (measured) |
— | THz generation with nonlinear organic crystals, for mor information please contact the instrument responsible |
General information about the Furka endstations can be found at: Furka
For questions and further information about Furka contact: Dr Elia Razzoli