List of available infrastructures and beams

Beams

The JYFL accelerator laboratory hosts three large-scale accelerators: The K130 cyclotron, MCC30/15 cyclotron and the 1.7 MV Pelletron.
The K130 is an isochronous cyclotron equipped with three external electron cyclotron resonance (ECR) ion sources and a multicusp light-ion source, which can deliver an exceptionally large variety of heavy- and light-ion beams up to the energy of 130 Q2/A MeV for use in research and applications.
The MCC30/15 is a small cyclotron for production of 18-30 MeV protons and 9-15 MeV deuterons with a dedicated filament-driven multicusp negative ion source.
The Pelletron accelerator is a dedicated facility for accelerator-based material physics.

Four ion sources injecting to the K130 cyclotron are available. Three of them are based on electron cyclotron resonance: 6.4, 14 and 18 GHz ECR ion sources. The fourth is a filament-driven multi cusp type H- light ion source LIISA.
The ECR ion sources are used for production of highly charged ion beams for nuclear and material physics experiments. LIISA is used for producing intensive proton beams for nuclear physics experiments and medical isotope production.

More information are available here.

For information on ion beams at the JYFL accelerator laboratory, contact the Program Advisory Committee (PAC) scientific secretary (link to contact).

Experimental facilities available at JYFL accelerator laboratory:

IGISOL (Ion Guide Isotope Separation On-Line)

The IGISOL (Ion Guide Isotope Separation On-Line) mass separator is the heart of the research infrastructure of the Exotic Nuclei and Beams -group. The facility is located in the newer part of the JYFL Accelerator Laboratory built around 10 years ago. IGISOL produces a broad range of low-energy (30 keV) radioactive and stable ion beams for studies of atomic nuclei and their properties. The layout of the IGISOL facility can be found here. Below you can find links to existing infrastructure at IGISOL.

More information available here.

Contact person:
Ari Jokinen, e-mail: ari.jokinen@jyu.fi

Recoil separators

The Accelerator Laboratory hosts two recoil separators mainly used in the study of nuclei produced in fusion-evaporation reactions. RITU is a gas-filled recoil separator suited to the study of heavy and superheavy nuclei, whilst MARA is a recoil-mass spectrometer better suited to the study of nuclei with masses below 150.

  • RITU gas-filled recoil separator

RITU is based on a standard DQQ magnetic configuration, with an extra vertically focusing quadrupole magnet in front of the dispersive element added, thus giving it a QDQQ configuration (see table opposite for detailed specifications). This gives an angular acceptance of 10 msr, the maximum rigidity is 2.2 Tm, the bending angle is 25 degrees, and the dispersion is 10 mm. The construction of the RITU separator was finished during 1994 and a wide-ranging experimental program was started. Alongside the strong experimental program, technical development work for the separator has continued. A differential pumping system was implemented, allowing windowless operation, hence improving beam focussing. Also a new dipole chamber was installed into RITU, which reduced the amount of scattered beam at the focal plane and therefore lowered the overall background.

Contact person:
e-mail: phys-info@jyu.fi​

  • MARA (Mass Analysing Recoil Apparatus)

MARA is a vacuum mode recoil separator with the ion-optical configuration QQQEDMD. MARA complements the capabilities of the RITU gas-filled recoil separator and extends the region of accessible nuclei down to lighter masses, and to cases where mass resolving power is required to select the nuclei of interest. The mass resolving power is of the order of 1/350 (FWHM).

Contact person:
e-mail: phys-info@jyu.fi​

JUROGAM3

JUROGAM3 is an array of Compton-suppressed HPGe detectors which has been constructed for use at the target position of the RITU or MARA recoil separators. The detectors (Eurogam clover, Eurogam Phase I and GASP -type) have been provided by the GAMMAPOOL collaboration. The support structure and frame of the array are from the earlier implentations of EUROGAM, which was situated at Daresbury Laboratory in the U.K., and at IReS Strasbourg in France. The frame has been modified such that it can be opened in a direction perpendicular to the beamline and moved between the target positions of the two separators. This enables access to the target chamber, and allows the use of high intensity beams for decay spectroscopy.

A number of ancillary devices, can be used in combination with JUROGAM3:

  • LISA (Light Ion Spectrometer Array)
  • SAGE (Silicon And GErmanium) Spectrometer
  • DPUNS plunger
  • SPEDE (SPectrometer for Electron Detection)

Contact person:
e-mail: phys-info@jyu.fi​

Large Scattering Chamber

There are three beamlines available for nuclear reaction studies and test experiments in the recently expanded LSC cavern. One line is equipped with a 1.5 m diameter Large Scattering Chamber.

Contact person:
e-mail: phys-info@jyu.fi​

Focal plane spectroscopy

Focal plane outline

  • GREAT spectrometer
  • MARA focal plane
  • RITU focal plane

Contact person:
e-mail: phys-info@jyu.fi​

MARA-LEB (MARA Low-Energy Branch)

The MARA-LEB facility is an extension to the MARA separator. It takes advantage of MARA’s selectivity to study medium-heavy nuclei whose production is overwhelmed by other less exotic species. The main area of interest for MARA-LEB is the N=Z line, close to the proton drip line. This area is a fertile ground to test the predictions of the shell model, investigate the interaction between the proton and the neutron, and to further explore nuclear shape coexistence.

Research performed using MARA-LEB will not only be of interest for fundamental nuclear physics, but will also be of importance for astrophysics, as the region of interest is at the heart of the rapid proton capture process that occurs in stars.

More information are available here and here.

Contact person:
e-mail: phys-info@jyu.fi​

RADiation Effects Facility

RADEF, RADiation Effects Facility, is specialized in applied research related to nuclear and accelerator ­based technologies, to study of radiation effects in electronics and related materials. RADEF officially became an ESA supported European Component Irradiation Facility (ECIF) in 2005. Since then irradiation tests have been carried out not only for ESA and the Euro­pean space industry, but also for other world leading space organizations, companies and universities (e.g. NASA, JAXA, CNES). The contract with ESA was again extended in 2023 and will continue till the end of 2027. RADEF offers wide variety of different sorts of radiations from gammas and electrons to protons and heavy ions for research. For these beams the RADEF group utilizes the LINAC electron accelerator, and combination of JYFL’s ECR ion sources and K-130 cyclotron.

More information are available here.

Contact persons:
Heikki Kettunen, e-mail: heikki.i.kettunen@jyu.fi
Mikko Rossi, e-mail: mikko.rossi@jyu.fi