Helical Orbit Spectrometer (HELIOS) on:
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The helical orbit spectrometer (HELIOS) is a measurement device for studying
Schematically, HELIOS is based around a large-bore superconducting solenoid. Accelerated heavy-ion beams enter
the solenoid along the magnetic axis, passing through a hollow detector array. The beam then intercepts a "light-ion" target, also on the magnetic axis. In the configuration shown in the figure, charged reaction products ejected rearward in the laboratory frame move in helical orbits to the detector array. Heavy beam-like recoils are kinematically focused forward in a narrow cone and intercepted by the so-called recoil detector array.
nuclear reactions
In nuclear physics and nuclear chemistry, a nuclear reaction is a process in which two nuclei, or a nucleus and an external subatomic particle, collide to produce one or more new nuclides. Thus, a nuclear reaction must cause a transformation ...
in inverse kinematics. It is installed at the ATLAS
An atlas is a collection of maps; it is typically a bundle of maps of Earth or of a region of Earth.
Atlases have traditionally been bound into book form, but today many atlases are in multimedia formats. In addition to presenting geograp ...
facility at Argonne National Laboratory
Argonne National Laboratory is a science and engineering research national laboratory operated by UChicago Argonne LLC for the United States Department of Energy. The facility is located in Lemont, Illinois, outside of Chicago, and is the lar ...
.
History
The HELIOS concept was first proposed at the ''Workshop on Experimental Equipment for an Advanced ISOL Facility'' atLawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory (LBNL), commonly referred to as the Berkeley Lab, is a United States national laboratory that is owned by, and conducts scientific research on behalf of, the United States Department of Energy. Located in ...
in 1998. The concept was introduced as a next-generation large-acceptance spectrometer for measuring heavy ion reactions.
Concept
Schematically, HELIOS is based around a large-bore superconducting solenoid. Accelerated heavy-ion beams enter
the solenoid along the magnetic axis, passing through a hollow detector array. The beam then intercepts a "light-ion" target, also on the magnetic axis. In the configuration shown in the figure, charged reaction products ejected rearward in the laboratory frame move in helical orbits to the detector array. Heavy beam-like recoils are kinematically focused forward in a narrow cone and intercepted by the so-called recoil detector array.
Development
The HELIOS Collaboration was formed with members from Argonne National Laboratory,Western Michigan University
Western Michigan Univers