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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.
Over the next 20 months, the solenoid was transformed into a nuclear spectrometer and connected to the ATLAS beam line. The first stable beam was tuned to the HELIOS target area on Tuesday, August 12, 2008 at 13:29. This first commissioning measurement studied the well-known nuclear reaction 28Si(''d'',''p'') in inverse kinematics in order characterize the performance of the spectrometer.
The radioactive ion beam commissioning of HELIOS took place in early March, 2009. This was the second measurement made with HELIOS and is considered the first actual "experiment" conducted using HELIOS.
HELIOS page
on the Physics Division Website
Physics World
article
APS ''Physics'' Synopsis
{{DEFAULTSORT:Helical Orbit Spectrometer (Helios) Argonne National Laboratory Spectrometers
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 o ...
in inverse kinematics. It is installed at the ATLAS
An atlas is a collection of maps; it is typically a bundle of world map, maps of Earth or of a continent or region of Earth. Advances in astronomy have also resulted in atlases of the celestial sphere or of other planets.
Atlases have traditio ...
facility at Argonne National Laboratory
Argonne National Laboratory is a Federally funded research and development centers, federally funded research and development center in Lemont, Illinois, Lemont, Illinois, United States. Founded in 1946, the laboratory is owned by the United Sta ...
.
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, Berkeley Lab) is a Federally funded research and development centers, federally funded research and development center in the Berkeley Hills, hills of Berkeley, California, United States. Established i ...
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 University (Western Michigan, Western or WMU) is a Public university, public research university in Kalamazoo, Michigan, United States. It was initially established as Western State Normal School in 1903 by Governor Aaron T. B ...
, and Manchester University
The University of Manchester is a public university, public research university in Manchester, England. The main campus is south of Manchester city centre, Manchester City Centre on Wilmslow Road, Oxford Road. The University of Manchester is c ...
to construct, characterize, and commission the HELIOS spectrometer. The construction of the spectrometer began with the delivery of the superconducting solenoid upon which HELIOS is based. The solenoid was delivered to Argonne on December 8, 2006. Over the next 20 months, the solenoid was transformed into a nuclear spectrometer and connected to the ATLAS beam line. The first stable beam was tuned to the HELIOS target area on Tuesday, August 12, 2008 at 13:29. This first commissioning measurement studied the well-known nuclear reaction 28Si(''d'',''p'') in inverse kinematics in order characterize the performance of the spectrometer.
The radioactive ion beam commissioning of HELIOS took place in early March, 2009. This was the second measurement made with HELIOS and is considered the first actual "experiment" conducted using HELIOS.
See also
* Canadian Penning Trap Mass Spectrometer * GammasphereReferences
External links
HELIOS page
on the Physics Division Website
Physics World
article
APS ''Physics'' Synopsis
{{DEFAULTSORT:Helical Orbit Spectrometer (Helios) Argonne National Laboratory Spectrometers