Resources

Publications

  • Beam intensity limitations in future multibend achromat light sources

    Author(s): I. Agapov and S. A. Antipov Fourth-generation synchrotron light sources have been an incredible success story and are currently driving groundbreaking research with photons. It turns out that the emittance of fourth-generation 6 GeV machines such as PETRA IV is close to what is theoretically achievable due to beam intensity limitations from space charge and intra-beam scattering. Further significant emittance reduction and brightness...

  • Operation of the $\overline{\mathrm{P}}\mathrm{ANDA}$ cluster-jet target with the HESR stochastic cooling at COSY

    Author(s): P. Brand, D. Bonaventura, H. Eick, R. Gebel, F. Goldenbaum, V. Hejny, J. Hetzel, V. Kamerdzhiev, C. Mannweiler, D. Prasuhn, J. Ritman, N. Shurkhno, R. Stassen, H. Stockhorst, S. Vestrick, M. Weide, and A. Khoukaz (P¯ANDA Collaboration) The PANDA experiment at the High Energy Storage Ring (HESR) of the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, will be a unique setup to study the strong interaction in antiproton...

  • Eliminating beam-induced depolarizing effects in the hydrogen jet target for high-precision proton beam polarimetry at the electron-ion collider

    Author(s): F. Rathmann, A. Nass, K. O. Eyser, V. Shmakova, E. C. Aschenauer, G. Atoian, A. Cannavo, X. Chu, K. Hock, H. Huang, H. Lovelace, G. Mahler, N. N. Nikolaev, J. Ritter, G. Robert-Demolaize, V. Schoefer, P. Shanmuganathan, E. Shulga, H. Soltner, and Z. Zhang Absolute proton beam polarimetry at the Electron–Ion Collider uses a polarized hydrogen jet target intersecting the hadron beam. At the EIC’s short bunch lengths and high repetition...

  • Study of fully coupled three-dimensional envelope instability using automatic differentiation

    Author(s): Ji Qiang Auto-differentiation is applied to investigate the instability of a fully coupled three-dimensional envelope system governed by 21 ordinary differential equations. Conventionally, analyzing this complex system would require solving 441 ordinary differential equations, which is computationally intractable. However, by using auto-differentiation, only 21 equations need to be tracked. This approach allowed us to uncover an additional...

  • Post long shutdown 2 CERN proton synchrotron transverse impedance model: Description and beam-based validation

    Author(s): Sébastien Joly, Mauro Migliorati, Nicolas Mounet, and Benoît Salvant High-brightness synchrotrons are increasingly limited by collective effects, particularly transverse impedance and space charge, which lead to beam degradation and losses. The interplay of transverse impedance, space charge, and chromatic effects complicates predictions and makes realistic validation of the CERN Proton Synchrotron (PS) impedance model challenging....

  • First plasma processing trial of a quarter-wave resonator cryomodule at the Facility for Rare Isotope Beams

    Author(s): Walter Hartung, Wei Chang, Yoo-Lim Cheon, Kyle Elliott, Sang-Hoon Kim, Taro Konomi, Patrick Tutt, Yuting Wu, and Ting Xu As large-scale superconducting-cavity accelerator facilities transition from the construction phase to the operational phase, the attention shifts from producing high-performance cryomodules to maintaining cryomodule performance. In situ plasma processing has helped to reduce field emission in superconducting linacs...

  • Full-scatter vector field analysis of an overmoded and periodically loaded cylindrical structure for the transportation of THz radiation

    Author(s): Adham Naji, Pawan Kumar Gupta, and Gennady Stupakov Highly overmoded iris-line waveguides offer an attractive solution for the efficient transportation of THz pulses over long distances. This paper presents the general (full-scatter) field analysis for the iris-line and its discontinuities under a paraxial excitation by an arbitrary source. By developing an advanced technique that combines Lorentz’s reciprocity theorem (with a generalized...
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