The U.S. Spallation Neutron Source (SNS) is a state-of-the-art neutron scattering facility delivering the world’s most intense pulsed neutron beams to a wide array of instruments which are used to conduct investigations in many fields of engineering, physics, chemistry, material science and biology. Neutrons are produced by spallation of liquid Hg by bombardment of short (~1s), intense (~40A) pulses of protons delivered at 60 Hz by a storage ring which is fed by a high-intensity, 1 GeV H- LINAC. This facility has operated nearly continuously since 2006 but has recently undergone a 4-month maintenance period which featured a complete replacement of the 2.5 MeV injector feeding the LINAC. The new injector was developed at ORNL in an off-line beam test facility and consists of an ion source, Low Energy Beam Transport (LEBT) and Radio Frequency Quadrupole (RFQ). This report first describes the installed configuration of the new injector detailing the ion source system. The first beam current, RFQ transmission, emittance and energy measurements from the injector installed on the SNS are reported which not only show a significant performance improvement for our existing facility but will now make accessible the higher beam current requirements for future SNS upgrade projects: the Proton Power Upgrade (PPU) and Second Target Station (STS).
|Category of your contribution||Negative ion sources|