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The design of the lattice for the Advanced Photon Source (APS) injector linac suitable for the interleaving operation of the thermionic and photocathode rf electron guns is presented.

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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 2016 North American Particle Accelerator Conference, 10/09/16 - 10/14/16, Chicago, IL, US
Country of Publication:
United States

Citation Formats

Shin, S., Sun, Y., and Zholents, A.. INTERLEAVING LATTICE DESIGN FOR APS LINAC*. United States: N. p., 2017. Web. doi:10.18429.
Shin, S., Sun, Y., & Zholents, A.. INTERLEAVING LATTICE DESIGN FOR APS LINAC*. United States. doi:10.18429.
Shin, S., Sun, Y., and Zholents, A.. Sun . "INTERLEAVING LATTICE DESIGN FOR APS LINAC*". United States. doi:10.18429.
author = {Shin, S. and Sun, Y. and Zholents, A.},
abstractNote = {The design of the lattice for the Advanced Photon Source (APS) injector linac suitable for the interleaving operation of the thermionic and photocathode rf electron guns is presented.},
doi = {10.18429},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jun 25 00:00:00 EDT 2017},
month = {Sun Jun 25 00:00:00 EDT 2017}

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  • We present the design, performance, and recent upgrade of a high-resolution, high-charge-sensitivity imaging camera and beam position monitor (BPM) system for the APS linac beam profile measurement. Visible light is generated from the incoming electron beam using standard YAG or optical transition radiation (OTR) converter screens. Two CCD cameras share the light through a beam splitter, each with its own imaging optics. Normally, one camera is configured with high magnification and the other with large field of view. In a different lens configuration, one of the cameras focuses at the far field, allowing the measurement of beam divergence using anmore » OTR screen, while the other camera simultaneous measures the beam size. A four-position actuator was installed recently to provide the option of two screens, a wakefield shield, and an in situ calibration target. A compact S-band beam position monitor electrode was designed to mount directly on the flag. The BPM rf circuit was fabricated from a machinable ceramic (MACOR) cylinder substrate, and the copper electrodes were deposited on the substrate. The new design and precision fabrication process make it viable to explore more complex microstrip components printed on the substrate and higher frequency applications. The proximity of the BPM and the camera (< 5 cm) will provide a precise calibration platform to study shot-to-shot jitter, long-term stability of both systems, and the dependence of BPM signal on beam properties (size, charge distribution) due to nonlinearity.« less
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  • A 67-pm hybrid-seven-bend achromat (H7BA) lattice is being proposed for a future Advanced Photon Source (APS) multi-bend-achromat (MBA) upgrade project. This lattice design pushes for smaller emittance and requires use of a swap-out (on-axis) injection scheme due to limited dynamic acceptance. Alternate lattice design work has also been performed for the APS upgrade to achieve better beam dynamics performance than the nominal APS MBA lattice, in order to allow off-axis accumulation. Two such alternate H7BA lattice designs, which target a still-low emittance of 90 pm, are discussed in detail in this paper. Although the single-particle-dynamics performance is good, simulations ofmore » collective effects indicate that surprising difficulty would be expected accumulating high single-bunch charge in this lattice. The brightness of the 90-pm lattice is also a factor of two lower than the 67-pm H7BA lattice.« less
  • The report describes the present design of the ILC Main Linac lattice. The topics covered include basic element layout, optical functions, and issues centered around the linac following of the Earth's curvature.