In the National Spallation Neutron Source (NSNS) design, a 180 meter long transport line connects the 1 GeV linac to an accumulator ring. The linac beam has a current of 28 mA, pulse length of 1 ms, and 60 Hz rep rate. The high energy transport line consists of sixteen 60 degrees FODO cells, and accommodates a 90 degrees achromatic bend, an energy compressor, collimators, part of injection system, and enough diagnostic devices to measure the beam quality before injection. To reduce the uncontrolled beam losses, this line has nine beam halo scrapers and very tight tolerances on both transverse and longitudinal beam dynamics under space charge conditions. The design of this line is presented.

https://arxiv.org/pdf/physics/9709013.pdf

The NSNS High Energy Beam Transport Line

The science and technology of proton accelerators have progressed considerably in the past three decades. Three to four orders of magnitude increase in both peak intensity and average flux have made it possible to construct high intensity proton accelerators for modern applications, such as: spallation neutron sources, kaon factory, accelerator production of tritium, energy amplifier and muon collider drivers. The accelerator design focus switched over from intensity for synchrotrons, to brightness for colliders to halos for spallation sources. An overview of this tremendous progress in both accelerator science and technology is presented, with special emphasis on the new challenges of accelerator physics issues such as: H/sup -/ injection, halo formation and reduction of losses.

https://digital.library.unt.edu/ark:/67531/metadc689976/m2/1/high_res_d/620978.pdf

Ultra-high intensity proton accelerators and their applications

The Ring to Target Beam Transport (RTBT) line connects the Spallation Neutron Source (SNS) accumulator ring to the target, with the required footprint for the accelerator complex. This line also provides four sets of beta collimators to clean any beam halo. This 160 meter long transport line consists of eleven 90 degree FODO cells, beam extraction and a beam spreader system, in addition to a ring extraction dump line.

/pdf/the-sns-ring-to-target-beam-transport-line-34k5eanqcu.pdf

The SNS Ring to Target Beam Transport line

Brookhaven is undertaking the design, construction and commissioning of the accumulator ring and the beam transport lines for the 1-GeV Spallation Neutron Source. The operating pressure of the accumulator ring vacuum system will be 10/sup -9/ Torr and is needed to minimize the beam-residual gas ionization. The vacuum requirement, the layout of the ring vacuum system, and the design of the vacuum chambers, vacuum pumps and other hardware are presented here.

/pdf/design-of-the-sns-accumulator-ring-vacuum-systems-55kjp43uun.pdf

Design of the SNS accumulator ring vacuum systems

The Accumulator Ring for the proposed National Spallation Neutron Source (NSNS) is to accept a 1.03 millisecond beam pulse from a 1 GeV proton linac at a repetition rate of 60 Hz. For each beam pulse, 10/sup 14/ protons are to be accumulated via charge-exchange injection. A 295 nanosecond gap in the beam, maintained by an RF system, will allow for extraction to an external target for the production of neutrons by spallation. This paper describes the four-fold symmetric lattice that has been chosen for the ring. The lattice contains four long dispersion-free straight sections to accommodate injection, extraction, RF cavities, and beam scraping respectively. The four-fold symmetry allows for easy adjustment of the tunes and flexibility in the placement of correction elements, and ensures that potentially dangerous betatron structure resonances are avoided.

/pdf/accumulator-ring-lattice-for-the-national-spallation-neutron-4izuragea4.pdf

Accumulator Ring lattice for the National Spallation Neutron Source

The goal of the proposed National Spallation Neutron Source (NSNS) is to provide a short pulse proton beam of about 0.5 /spl mu/s with average beam power of 1 MW. To achieve such purpose, a proton storage ring operated at 60 Hz with 1/spl times/10/sup 14/ protons per pulse at 1 GeV is required. The Accumulator Ring (AR) receives 1 msec long H/sup -/ beam bunches of 28 mA from a 1 GeV linac. Scope and design performance goals of the AR are presented, other possible technological choices and design options considered, but not adopted, are also briefly reviewed.

Accumulator Ring Design for the NSNS Project

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Accumulator Ring Design for the NSNS Project