FRIB, East Lansing, USA
To achieve the design beam power for heaviest ion species, acceleration and transport of multi charge state beams simultaneously in the FRIB superconducting linac becomes necessary, which poses a technical challenge especially to the FRIB folded lattice design. Achromatic and isochronous beam optics up to the second order must be established precisely in the linac bending areas, and as none-perfection beam elements and system errors exist in the real machine, beam tuning and beam optics corrections of the bending area are important to high power operation. In this paper, we introduce the beam tuning algorithms of the FRIB linac achromatic arcs and also discuss the simulation studies.
FRIB, East Lansing, USA
Beam tuning and error analysis of a superconducting linac for heavy ion beams are introduced in this paper. In simulation studies with accelerator codes, system errors to the beam tuning are analyzed numerically, which include random cavity and magnet errors and measurement errors of absolute beam phase, beam bunch length, and beam transverse profiles. Simple statistical equations are developed from the tedious and time-consuming numerical simulations, and they may provide advantage tools not only to analyze a linac beam tuning, such as phase and amplitude tuning of superconducting cavity, longitudinal and transverse beam matching, but also will be very helpful to linac design with practical beam diagnostics system and authentic accelerator lattice.
FRIB, East Lansing, USA
Accelerator beam simulation is crucial for the successful commissioning and operation of the FRIB linear accelerator. A primary requirement of the FRIB linear accelerator is to support a broad range of particle species and change states. Beam simulations must be performed for these various accelerator configurations and it is important the results be managed to ensure consistency and reproducibility. The FRIB Lattice-Model Service has been developed to manage simulation data using a convenient web-based interface, as well as, a RESTful API to allow integration with other services. This service provides a central location to store and organize simulation data. Additional features include search, comparison and visualization. The system architecture, data model and key features are discussed.
FRIB, East Lansing, USA
The new software FLAME has been developed to serve as physics model used for on-line beam commissioning applications. FLAME is specially designed to cover FRIB modeling challenges to balance between speed and precision. Several on-line beam commissioning applications have been prototyped based on FLAME and tested on the physics application prototyping environment. In this paper, components of the physics application prototyping environment are firstly described. Then, the design strategy and result of the four major applications: baseline generator, cavity tuning, orbit correction, transverse matching, are discussed.
IMP/CAS, Lanzhou, People's Republic of China
CIADS (China Initiative Accelerator Driven System) 600MeV HEBT (High-Energy Beam Transport) will deliver 6 MW beam to the target, with CW (continuous wave) 10 mA beam. The most serious challenges are vacuum differential section and beam uniformization on the target. A novel collimation plus vacuum differential section is proposed in the lattice design. A scanning method is designed for the round beam uniformization on the target.
Fermilab, Batavia, Illinois, USA
NSCL, East Lansing, Michigan, USA
FRIB, East Lansing, USA
NSCL, East Lansing, Michigan, USA
FRIB, East Lansing, USA
Self-consistent simulation studies of the FRIB low energy beam transport (LEBT) system are conducted with the PIC code Warp. Transport of the many-species DC ion beam emerging from an Electron Cyclotron Resonance (ECR) ion source is examined in a realistic lattice through the Charge Selection System (CSS) which employs two 90-degree bends, two quadrupole triplets, and slits to collimate non-target species. Simulation tools developed will support commissioning activities on the FRIB front end which begins early operations in 2017. Efficient transverse (xy) slice simulation models using 3D lattice fields are employed within a scripted framework that is readily adaptable to analyze many ion cases and levels of model detail. Effects from large canonical angular momentum (magnetized beam emerging from ECR), thermal spread, nonlinear focusing, and electron neutralization are examined for impact on collimated beam quality.
FRIB, East Lansing, USA
Abstract New online model for ReAccelerator 3 (ReA3) has been developed for actual beam tunings using IMPACT, which is one of famous particle tracking codes in accelerator field. DYNAC model was used for ReA3 optics calculation. However it basically can calculate symmetric cavity, not axisymmetric ones such as super-conductive Quarter-Wave Resonators (QWRs), which are installed in ReA3. This means that it is difficult to effectively tune beams at present situation. In order to handle beams at ReA3, a new alternative and more precise model of IMPACT is under development, which would be acceptable to actual beam operation. This paper reports benchmarked results of IMPACT and DYNAC model for ReA3 acceleration line just after RFQ exit to a transport line with symmetric cavity as a first step before more precise simulation including non-axisymmetric cavity and RFQ calculation.