Helical Orbit Spectrometer (HELIOS)
Encyclopedia
The Helical Orbit Spectrometer (HELIOS) is a measurement device for studying nuclear reactions in inverse kinematics. It is installed at the ATLAS
facility at Argonne National Laboratory
.
in 1998. The concept was introduced as a next-generation large-acceptance spectrometer for measuring heavy ion reactions.
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.
, and Manchester University 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.
Argonne Tandem Linear Accelerator System
The Argonne Tandem Linac Accelerator System is a scientific user facility at Argonne National Laboratory. ATLAS is the first superconducting linear accelerator for heavy ions at energies in the vicinity of the Coulomb barrier....
facility at Argonne National Laboratory
Argonne National Laboratory
Argonne National Laboratory is the first science and engineering research national laboratory in the United States, receiving this designation on July 1, 1946. It is the largest national laboratory by size and scope in the Midwest...
.
History
The HELIOS concept was first proposed at the Workshop on Experimental Equipment for an Advanced ISOL Facility at Lawrence Berkeley National LaboratoryLawrence Berkeley National Laboratory
The Lawrence Berkeley National Laboratory , is a U.S. Department of Energy national laboratory conducting unclassified scientific research. It is located on the grounds of the University of California, Berkeley, in the Berkeley Hills above the central campus...
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 enterthe 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 UniversityWestern Michigan University
Western Michigan University is a public university located in Kalamazoo, Michigan, United States. The university was established in 1903 by Dwight B. Waldo, and as of the Fall 2010 semester, its enrollment is 25,045....
, and Manchester University 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.
External links
- HELIOS page on the Physics Division Website
- Physics World article
- APS Physics Synopsis