The first general user call for powder X-ray diffraction, PXRD, experiments using the area detector instrument will open on February 2nd 2021 with deadline on March 16th. The amount of beamtime awarded during this round is expected to be lower than usually due to a backlog of commissioning experiments that has been postponed due to the current ‘warm shutdown’. This will mean that some experiments are accepted outright and some will be put on a waiting list and will be accepted if it is possible to schedule them during the cycle.

DanMAX is primarily funded through Danish sources, however, the beamline is accessible through the MAX IV general user program.

Upcoming calls:

DanMAX is a hard X-ray materials science beamline on the 3GeV ring at MAX IV. During the fall of 2020, the beamline installation was be completed and full commissioning began. Commissioning experiments with external experts is scheduled throughout the first half of 2021 (subject to change due to the warm shutdown).

The photon energy available at DanMAX is 15-35 keV. Higher harmonic rejection is currently not possible; however, the contamination is very low and not observable in most experiments – even at 15 keV.

Proposals must be submitted via the MAX IV DUO system, however, we encourage interested users to contact the beamline staff to discuss their experiments before submission. When submitting proposals in DUO, please choose ‘Material Science with hard X-rays’ as a research area in order to select DanMAX.

Status, available techniques and equipment:

Beam:

Variable energy from 15 – 35 keV (hDCM Si111) – no higher harmonic rejection is currently possible.

Beam size at the PXRD instrument is about 1 mm and can be focused to below 20 µm (vertical) for most energies. The exact focus size varies for different energies.

Beam stops with various diameters from Ø2.0 mm to Ø4.0 mm (motorized in XYZ)

Detectors:

  • The available area detector is the DECTRIS PILATUS3 X 2M CdTe. Sample to detector distance is variable from ~150 mm to ~650 mm. Vertical and lateral motion of the detector is not possible. The detector can record frames up to 250 Hz. The readout time is 0.95 ms leading.
  • Incident intensity can be recorded live in 5 location along the beamline. A diode can be inserted behind the sample for alignment and absorption measurements.
  • A single element silicon drift detector for X-ray fluorescence is available on the instrument.

 

Sample environments:

  • Capillary spinner in horizontal or vertical orientation. Manual Huber 1002 goniometer head and rotation speed up to 5 Hz. Samples are mounted using SPINE magnetic caps
  • Rotation stage: Huber 408 goniometer in vertical orientation. Manual Huber 1002 goniometer head.
  • Oxford Cryosystems, Cryostream 800 PLUS. Open flow nitrogen stream for sample temperatures in the range 80-500 K. The cryostream is available with both sample spinner and rotation stage.
  • For user build sample environments we offer a standard 25 mm pitch M6 breadborad. The usable surface is round with a diameter of 280 mm. The distance from the surface of the breadboard to the beam is 200 mm. Sample environments must be pre-approved by BL staff.

Gases:

  • No gas handling is in place at the sample position. Non-toxic and non-flammable gases can currently be handled, please contact BL staff before submitting your proposal if you require any gases.

 

Acknowledgements:

When publishing any material arising from work carried out at MAX IV, do not forget to acknowledge MAX IV and our funders. This obligation applies to both infrastructure personnel and researchers using the infrastructure.

The following acknowledgment statement is to be used in all cases:

“We acknowledge MAX IV Laboratory for time on Beamline DanMAX under Proposal [xxxx]. Research conducted at MAX IV is supported by the Swedish Research council under contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under contract 2018-04969, and Formas under contract 2019-02496. DanMAX is funded by the NUFI grant no. 4059-00009B”.

The XRF detector is on loan from the Birkedal group at Aarhus University, Denmark. Please include the following acknowledgement if publishing data obtained using the XRF detector: “The XRF detector was made available by Aarhus University through grant CF18-0802 from the Carlsberg Foundation.”