11.10.2016

# RITU

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### RITU - Recoil Ion Transport Unit

Name and Model (Year of Manufacture / Installation)

Danfysik RITU (Recoil Ion Transport Unit) (1994/1994)

General Information

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 below 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 focusing. 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.

Key Specifications
 Magnetic configuration QVDQHQV Maximum beam rigidity 2.2 Tm Angular acceptance 10 msr Dispersion 10 mm/% of Bρ Dipole bending radius 1.85 m Dipole bending angle 25 degrees Dipole entrance angle 0 degrees Dipole exit angle -25 degrees Dipole pole gap 100 mm Q1 effective length 350 mm Q1 maximum gradient 13.5 T/m Q1 aperture diameter 105 mm Q2,3effective length 600 mm Q2,3maximum gradient 6.0 T/m Q2,3aperture diameter 200 mm

Location, Contact Person

Department of Physics, YS150 / Juha Uusitalo