Recoil Separator 1 - 3 MeV/u
This Working Group will be merged with the Gas filled separator and High Efficiency Spectrometer (ISLA- or VAMOS-like) Working Groups into a new ReA12 Recoil Separator Working Group. Please see the details on this new ReA12 Recoil Separator web page or contact the Point of Contact Dariusz Sweryniak with questions.
Electro-magnetic vacuum recoil mass separators play a prominent role in nuclear physics
experiments. They separate products of nuclear reactions, primarily fusion-evaporation
reactions, from a beam and disperse them according to their mass to charge state ratio.
There are several separators of this type worldwide, including the Recoil Mass Separator
at ORNL, the Fragment Mass Analyzer at ANL, which are currently actively used for research,
and the ElectroMagnetic Mass Analyzer at TRIUMF, which in under construction. They offer
an acceptance solid angle of about 10 msr and a mass resolution of about 1/350. These
devices were extensively and successfully used for in-beam and decay studies of exotic
nuclei located far from the line of stability in the past. A similar separator will be
required for experiments with re-accelerated radioactive beams at FRIB.
Given the initial low intensity of radioactive beams, the efficiency of the FRIB mass separator is of primary concern. A large gain can be obtained in comparison with the existing devices by increasing its M/Q acceptance, i.e., by increasing number of charge states transported through the device. On the other hand, the beam suppression is of lesser importance.
First design studies indicate that an electro-magnetic vacuum mass separator with a solid angle of +/-50 mrad, an M/Q range of about +/-10%, i.e., almost 2 times better than the existing devices, a magnetic rigidity Bρmax ~1.5 Tm, an electric rigidity Eρmax>10 MV, and a mass resolution FWHM~1/300, is feasible.
If you are interested in planning, designing and constructing an electro-magnetic vacuum mass separator for FRIB please contact one of the Conveners to join our Working Group. The upcoming FRIB equipment workshop in East Lansing on February 20-22, 2010 will be an excellent opportunity to meet and exchange ideas.
The Conveners of this Working Group are:
Dariusz Seweryniak, ANL, seweryniak at anl.gov [Point of Contact]
Robert Tribble, TAMU
Equipment Workshop Questionnaire
The Recoil Separator (1 - 3 MeV/u) Working Group's Questionnaire for the February FRIB Equipment workshop is linked here.
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