ReA12 Recoil Separator
Description
There are currently three different Working Groups on intermediate energy
mass separators / recoil separators for FRIB:
Gas filled separator - Point of Contact Ken Gregorich (LBNL)
High Efficiency Spectrometer (ISLA- or VAMOS-like) - Point of Contact Daniel Bazin (NSCL)
Recoil Separator 1 - 3 MeV/u - Point of Contact Dariusz Seweryniak (ANL)
These groups are planning to merge into one new "ReA12 Recoil Separator" Working Group
at the upcoming
Second Low Energy Community Meeting on August 17-18, 2012, at Argonne National Laboratory.
The initial goal of this new Working Group is to shape the requirements and characteristics of a device that can
filter out unreacted beam particles and separate and characterize the reaction residues of interest.
As a first step, the Co-Conveners are calling on the FRIB User community
(see below) to put forth experimental concepts and ideas that would require
a recoil separator at Rea12. These proposals will be discussed at the
August meeting and will shape the preferred design of a Rea12 separator.
Please send your ideas to the Points of Contact of one of the 3 existing
separator FRIB Working Groups --
Daniel Bazin, bazin at nscl.msu.edu
Ken Gregorich, KEGregorich at lbl.gov
Dariusz Seweryniak, seweryniak at anl.gov
Message from the Co-Conveners
Dear FRIB User,
One of the most exciting features of the future FRIB facility will be the availability
of re-accelerated radioactive beams with good emittance characteristics, low contamination,
and no rate dependence on the chemical properties of the chosen element.
To fully exploit these future beams, many experiments will require use of a recoil separator
to filter out the unreacted beam particles and separate as well as characterize the reaction
residues of interest.
This letter is a call to the FRIB User community to put forward experimental concepts and
ideas that require a recoil separator, that would utilize the beams produced by the ReA12
accelerator, in order to shape the requirements and characteristics of such a device.
The proposals should emphasize the physics goals and the required characteristics of the
separator. These include, for instance, acceptances (momentum and geometrical), resolutions
(momentum, m/q), rigidity (magnetic, electric), suppression factors for beam and unwanted
reaction products, separation of reaction residues (brho, m/q, mass), beam angle on target,
spot size at focal plane, and required space around reaction target and around the focal plane.
To facilitate rate calculations, a web page where the expected intensities of re-accelerated
radioactive beams produced by ReA12 is available at
https://groups.nscl.msu.edu/frib/rates/fribrates.html
(the rate is labeled “Reaccelerated beam rate” at the bottom of the web form).
The proposals should be sent to points of contact of one of the 3 existing separator FRIB
user working groups (D. Bazin at bazin@nscl.msu.edu, K. Gregorich at KEGregorich@lbl.gov,
D. Seweryniak at seweryniak@anl.gov ). We anticipate that the authors of these proposals
will get an opportunity to present their ideas during the session on the FRIB recoil
separator during the upcoming Second Low Energy Community Meeting, announced for
August 17-18, 2012, that will take place at Argonne National Laboratory following the
Nuclear Structure Conference.
We also believe that a merge of the three existing FRIB separator groups would facilitate
closer collaboration between FRIB users interested in constructing and using a recoil
separator at ReA12 and would ultimately result in a separator design that is most suited
for the physics programs of future users. The details of the merge and an eventual future
common workshop will be discussed during the separator session at Argonne.
We are looking forward to see you at Argonne on 17-18th August. If you cannot come to the
meeting you may ask some other participant to show your slides.
Sincerely,
D. Bazin, K. Gregorich, D. Seweryniak
Conveners
The Co-Conveners of this new Working Group are:
Daniel Bazin, NSCL, bazin at nscl.msu.edu
Ken Gregorich, LBNL, KEGregorich at lbl.gov
Dariusz Seweryniak, ANL, seweryniak at anl.gov
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