TUA2WB —  WG-B   (06-Mar-18   11:00—12:30)
Chair: Q. Qin, IHEP, Beijing, People's Republic of China
Paper Title Page
Future Synchrotron Light Source in Thailand  
  • T. Chanwattana, N. Juntong, K. Kittimanapun, P. Klysubun, T. Pulampong, P. Sudmuang
    SLRI, Nakhon Ratchasima, Thailand
  A 3-GeV synchrotron light source has been designed as a future light source in Thailand. The storage ring is designed utilising Double Triple Bend Achromat (DTBA) lattice to achieve beam emittance below 1 nm·mrad, maximum beam current of 300 mA and two straight sections per cell. A full energy linac is a promising choice as the storage ring injector due to its potential to be operated as the storage ring injector and an injector for a short pulse facility. The linac can be upgraded to a soft X-ray Free Electron Laser (FEL) facility by extending an undulator section. The design of the linac injector consists of a pre-injector based on a photocathode RF gun, two main linacs based on high gradient S-band structures, and two bunch compressors. The high gradient S-band structure with the accelerating gradient of 35-40 MV/m is suitable to achieve the beam energy of 3 GeV within the injector length of about 150 m. The bunch compressors are included for generating 100-fs electron bunches for the short pulse facility. This paper presents designs and simulation results of the storage ring and the linac injector of Thailand new light source.  
slides icon Slides TUA2WB01 [7.487 MB]  
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TUA2WB02 Multi-Bend Lattice Analysis Towards a Diffraction Limited Ring Based Light Source 28
  • E. Karantzoulis
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  An analysis of lattice configurations up to 10 bend achromat is presented aiming towards diffraction limited ring based light source. The described analysis can apply to any type of a ring based light source however for practical reasons we consider Elettra that has been operating for users for 24 years; to stay competitive for world-class photon science in the future a massive upgrade of the storage ring is needed. The optimum solution is based on certain design criteria, constraints regarding certain accelerator components and their implications on beam dynamics and user requirements. The space available for insertion devices as well as the impact of anti-bends on the design is also addressed. Two proposed realistic lattices are further discussed taking into account different criteria and user requirements. Those lattices reduce the emittance of the present machine by more than one order of magnitude but at the same time respect many other criteria such as realistic magnet gradients, magnets with magnetic length equal to the physical length, drift space enough for radiation extraction, large available space for insertion devices, minimal shift of the beam lines etc.  
slides icon Slides TUA2WB02 [12.781 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUA2WB02  
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Modeling Ion Effects for the APS-U  
  • J.R. Calvey, M. Borland
    ANL, Argonne, Illinois, USA
  Ions are produced in an accelerator when the beam ionizes residual gas inside the vacuum chamber. If the beam is negatively charged, ions can become trapped in the beam's potential, and their density will increase over time. Trapped ions can cause a variety of undesirable effects, including instability and emittance growth. Typically, simulation of ion effects is done using a "weak-strong" model, in which the ions are modeled using macroparticles, but the beam is assumed to be a fixed Gaussian distribution, with only centroid motion allowed. This type of model necessarily neglects incoherent beam effects, such as decoherence, emittance growth, and tune spread. Recently, an IONEFFECTS element has been incorporated into the particle tracking code ELEGANT. The code has been parallelized, and allows for modeling intra-bunch effects, in combination with other elements. Ion effects have been modeled for the APS-U storage ring and Particle Accumulator Ring, using both a weak-strong code and ELEGANT. Some of the questions investigated include ion instability in the presence of train gaps, ion-induced emittance growth, and multiple ionization.  
slides icon Slides TUA2WB03 [1.133 MB]  
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TUA2WB04 Ion Instability in the HEPS Storage Ring 34
  • S.K. Tian, N. Wang
    IHEP, Beijing, People's Republic of China
  The High Energy Photon Source (HEPS), a kilometre scale storage ring light source, with a beam energy of 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing and now is under design. We investigate the ion instability in the storage ring with high beam intensity and low-emittance. We performe a weak-strong simulation to show characteristic phenomena of the instability in the storage ring.  
slides icon Slides TUA2WB04 [3.446 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUA2WB04  
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