Abstract
This paper summarizes the low-loss design for the Spallation Neutron Source accumulator ring [``Spallation Neutron Source Design Manual'' (unpublished)]. A hybrid lattice consisting of FODO arcs and doublet straights provides optimum matching and flexibility for injection and collimation. For this lattice, optimization focuses on six design goals: a space-charge tune shift low enough (below 0.15) to avoid strong resonances, adequate transverse and momentum acceptance for efficient beam collimation, injection optimized for desired target beam shape and minimal halo development, compensation of magnet field errors, control of impedance and instability, and prevention against accidental system malfunction. With an expected collimation efficiency of more than 90%, the uncontrolled fractional beam loss is expected to be at the ${10}^{\ensuremath{-}4}$ level.
Highlights
In recent years, high-intensity ion beams have been proposed for a wide variety of applications
Based on operational experience at the LAMPF linac [2] at Los Alamos National Laboratory and the alternating gradient synchrotron (AGS) and Booster [3] at Brookhaven National Laboratory, hands-on maintenance [4] demands an average uncontrolled beam loss not exceeding a couple of watts of beam power per tunnel meter
The high energy beam transport (HEBT) line has a transverse acceptance of 30p mm mrad to accommodate an incoming beam with 0.25p mm mrad rms unnormalized emittance, and it has a momentum acceptance of 61% to accommodate an incoming rms momentum spread of 0.033%
Summary
High-intensity ion beams have been proposed for a wide variety of applications These include spallation neutron sources, neutrino factories, transmutation of nuclear waste, heavy ion fusion, and muon collider drivers [1]. Beam power in these machines, usually 1 MW or more, is 1 order of magnitude above that of existing accelerator facilities. Existing proton synchrotrons and accumulator rings have beam losses as high as several tens of percent, mostly at injection, capture, and initial ramping. The smallest beam loss is about 3 3 1023, achieved at the proton storage ring (PSR) at the Los Alamos National Laboratory.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical Review Special Topics - Accelerators and Beams
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
