International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS 2015)

Commissioning the cryogenically cooled gas target and the ionization chamber of HELIOS

12 May 2015, 17:00

Center Concourse

Poster Presentation Poster Session B

Speaker

Daniel Santiago-Gonzalez (LSU, ANL)

Description

The HELIcal Orbit Spectrometer (HELIOS) has been used to successfully study reactions in inverse kinematics with both stable and radioactive beams; however, initial studies were limited to solid targets. In addition, in the original implementation of HELIOS a telescope of silicon detectors was used for recoil detection and, while it provided particle identification information for recoils with A<30, such a device is limited to rates of ~10 kHz and covers a relatively small solid angle. To broaden the scope of nuclear reactions accessible with HELIOS and to increase recoil detection capabilities, two devices have been developed: a cryogenically cooled gas target, which allows for the study of reactions in inverse kinematics using for example 3He or 4He targets, and a high-rate ionization chamber that captures a much larger fraction of the recoils than the silicon telescope and is capable of detecting heavy recoils with A<150 at rates of up to 500 kHz. The technical details of the new devices are presented and results from the commissioning experiments are discussed. This material is based upon work supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract No. DE-AC02-06CH11357 and LSU grant U.S. Department of Energy grant No. DE-FG02-96ER40978. This research used resources of ANL’s ATLAS facility, which is a DOE Office of Science User Facility.