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MAX IV

MAX IV aerial photo from 2014
General properties
Accelerator type	Synchrotron light source
Beam type	Electrons
Target type	Light source
Beam properties
Maximum energy	Large ring: 3.0 GeV, Small ring: 1.5 GeV
Maximum current	Large ring: 500 mA, normal current 400 mA, Small ring: 500 mA
Physical properties
Length	Linac: ~300 metres (1,000 ft)
Radius	Linac: 40 millimetres (1.6 in), Storage rings: 15 millimetres (0.59 in)
Circumference	Large ring: 528 metres (1,732 ft), Small ring: 96 metres (315 ft)
Location	Brunnshög, Lund, Sweden
Coordinates	55°43′37″N 13°13′59″E / 55.727°N 13.233°E / 55.727; 13.233
Institution	Lund University
Dates of operation	2016 - present
Preceded by	MAX III

MAX IV is the world's first 4th generation synchrotron light source facility in Lund, Sweden. Its design and planning was carried out within the Swedish national laboratory, MAX-lab, which up until 2015 operated three storage rings for synchrotron radiation research: MAX I (550 MeV, opened 1986), MAX II (1.5 GeV, opened 1997) and MAX III (700 MeV, opened 2008). MAX-lab supported about 1000 users from over 30 countries annually. The facility operated 14 beamlines with a total of 19 independent experimental stations, supporting a wide range of experimental techniques such as macromolecular crystallography, electron spectroscopy, nanolithography and production of tagged photons for photo-nuclear experiments. The facility closed on 13 December (Saint Lucy's Day) 2015 in preparation for MAX IV.

On 27 April 2009 the Swedish Ministry of Education and Research, Swedish Research Council, Lund University, Region Skåne and Vinnova, a Swedish government funding agency, decided to fund the research center.

The new laboratories, including two storage rings and a full-energy linac is situated in the northeastern quarter Brunnshög in Lund. The inauguration of MAX IV took place on the 21th of June, the day of summer solstice, 2016. The larger of the two storage rings has a circumference of 528 meters, operates at 3 GeV energy, and has been optimized for high-brightness x-rays. The smaller storage ring (circumference 96 meters) is operated at 1.5 GeV energy and has been optimized for UV. There are also plans for a future expansion of the facility that would add a free-electron laser (FEL) to the facility, but is yet to be funded.

There are currently 16 beamlines at the facility with 10 of them located around the 3 GeV ring, 5 around the 1.5 GeV ring and one at the linac.

History

Design

MAX IV has two electron guns below ground level, one thermionic gun with a hot cathode, and one photogun with a photocathode, both with the RF-range frequency 3 GHz. The thermionic gun sends electrons via the linac into both storage rings for a few seconds once every 10 minutes continuously in order to maintain the total amount of electrons in the storage rings at a constant level. That is called a top-up injector. After half the linac, ~150 metres (500 ft), a diagonal transfer line sends about one quarter of the electrons up to ground level for the small storage ring. After the whole linac, a second diagonal transfer line sends the rest of the electrons up to ground level for the large storage ring. The photogun sends electrons the rest of the time via the linac to the short-pulse facility (SPF) at MAX IV.

The small 1.5 GeV storage ring is called R1 and has a circumference of 96 metres (315 ft). It consists of 12 3.5 metres (~11 ft) long straight sections, numbered 1-12, each followed by a 4.5 metres (15 ft) long rounded corner, called double-bend achromats (DBA), meaning that they each contain two pairs of bending magnets. The magnetic field is pointing downwards with a strength in the order of 1 T, pulling the incoming electrons to the right and thus makes the electrons to go clockwise in the ring.

Accelerators and beamlines

External relations

Educational outreach

Current and former directors

See also

• List of synchrotron radiation facilities
• European Spallation Source

References

1. ^ "3 GeV storage ring". maxiv.lu.se. MAX IV. Retrieved 6 November 2024.
2. ^ "1.5 GeV storage ring". maxiv.lu.se. MAX IV. Retrieved 6 July 2022.
3. "MAX IV Machine Status". maxiv.lu.se. MAX IV. Retrieved 5 November 2024.
4. ^ "Guns and linear accelerator". maxiv.lu.se. MAX IV. Retrieved 6 November 2024.
5. ^ "History". maxiv.lu.se. MAX IV. Archived from the original on 25 November 2020. Retrieved 20 July 2022.
6. Einfeld, Dieter (2 November 2014). "Multi-bend Achromat Lattices for Storage Ring Light Sources". Synchrotron Radiation News. 27 (6): 4–7. Bibcode:2014SRNew..27....4E. doi:10.1080/08940886.2014.970929. ISSN 0894-0886. S2CID 120677730.
7. P.F., Tavares; S.C., Leemann; M., Sjöström; Å., Andersson (1 September 2014). "The MAX IV storage ring project". Journal of Synchrotron Radiation. 21 (5): 862–77. doi:10.1107/S1600577514011503. ISSN 1600-5775. PMC 4181638. PMID 25177978.
8. "Världens starkaste synkrotron invigs - Umeå universitet". www.teknat.umu.se (in Swedish). 21 June 2016. Archived from the original on 18 September 2016. Retrieved 27 May 2017.
9. M., Johansson; B., Anderberg; L.-J., Lindgren (1 September 2014). "Magnet design for a low-emittance storage ring". Journal of Synchrotron Radiation. 21 (5): 884–903. doi:10.1107/S160057751401666X. ISSN 1600-5775. PMC 4181640. PMID 25177980.
10. E., Al-Dmour; J., Ahlback; D., Einfeld; P.F., Fernandes Tavares; M., Grabski (1 September 2014). "Diffraction-limited storage-ring vacuum technology". Journal of Synchrotron Radiation. 21 (5): 878–83. doi:10.1107/S1600577514010480. ISSN 1600-5775. PMC 4181639. PMID 25177979.
11. ^ "History – MAX IV". www.maxiv.lu.se. Archived from the original on 25 November 2020. Retrieved 27 May 2017.
12. "Accelerators – MAX IV". www.maxiv.lu.se. Archived from the original on 11 June 2017. Retrieved 27 May 2017.
13. Rift, Geer (8 November 2021). "Beamlines & accelerators". MAX IV. Retrieved 16 October 2022.
14. Rift, Geer (25 November 2021). "Guns and linear accelerator". MAX IV. Retrieved 7 November 2024.
15. "Machine Status – MAX IV". status.maxiv.lu.se. Retrieved 7 November 2024.
16. Rift, Geer (25 November 2021). "Guns and linear accelerator". MAX IV. Retrieved 7 November 2024.
17. Rift, Geer (25 November 2021). "1.5 GeV storage ring". MAX IV. Retrieved 21 November 2024.
18. Rift, Geer (25 November 2021). "1.5 GeV storage ring". MAX IV. Retrieved 27 November 2024.
19. Rift, Geer (11 August 2022). "Beamlines". MAX IV. Retrieved 27 November 2024.

External links

• Website of the MAX IV Laboratory
• Lightsources.org, information about the world's synchrotron and free electron laser light source facilities
• International evaluation of the MAX IV concept (2006), in .pdf format
• Status of the MAX IV Laboratory, article published by Taylor & Francis in Synchrotron Radiation News on 1 February 2016, available online: http://www.tandfonline.com/doi/full/10.1080/08940886.2016.1124683
• MAX IV is Ready to Make the Invisible Visible, article published by Taylor & Francis in Synchrotron Radiation News on 2 December 2016, available online: http://www.tandfonline.com/doi/full/10.1080/08940886.2016.1244463

• 2016 establishments in Sweden
• Buildings and structures completed in 2016
• Synchrotron radiation facilities
• Lund University
• Buildings and structures in Lund
• Laboratories in Sweden
• Summer solstice