Generation of Picosecond X-Ray Pulses in the ALS Using RF Orbit Deflection

Robin, D.; Byrd, J.; Fischer, Peter; Heimann, Philip; Kim, Dong-Hyun; Kwiatkowski, S.; Li, Derun; Sannibale, F.; Steier, C.; Wan, Weishi; Wittmer, W.; Zholents, A.

doi:10.1109/pac.2005.1591572

Cited by 4 publications

(4 citation statements)

References 8 publications

(8 reference statements)

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“…This range of pulse duration is useful in numerous experiments but shorter pulses of sub-picoseconds radiation, such as those associated with ultra fast phenomena, would extend the scientific frontier. Many efforts have been made to produce shorter X-ray pulses in synchrotron radiation facilities [1][2][3][4][5][6][7][8]. As a third generation light source, Taiwan Photon Source (TPS) would produce about 19 ps-long (rms) X-ray pulses by operating the accelerating radio frequency (RF) cavity at 1.1 MV.…”

Section: Introductionmentioning

confidence: 99%

Utilization of transverse deflecting RF cavities in the designed QBA lattice of 3 GeV Taiwan Photon Source

2010

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A pair of superconducting transverse deflecting RF cavities has been studied in the QBA low emittance lattices of the 3 GeV TPS for generating ultra short X-ray pulses. Three configurations with different locations for the two cavities in a super-period of the TPS ring are investigated. During numerous turns of the electron tracking, the nonlinear effects between the cavities, the energy spread, the momentum compaction factor, and the synchrotron radiation effects are taken into account. The configuration with positioning the RF deflectors between the QBA cells in each super-period as an optimum arrangement gives rise to better quality electron bunches and radiated photon pulses. The FWHM of the radiated photon pulses of about 540 fs with an acceptable intensity is attained by optimizing the compression optical elements of the TPS photon beam line. Furthermore, the effects of the electron bunch length are studied by alternatively employing an accelerating RF cavity operating with 1.1 MV and 3.0 MV, respectively. The operation of the accelerating RF cavity at 3.0 MV improved the intensity of the photon pulses up to 30% and reduced the equilibrium vertical emittance down to 70 pm-rad. The error tolerance for the deflecting cavities, QBA lattice and injection process are also evaluated.

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Section: Introductionmentioning

confidence: 99%

Utilization of transverse deflecting RF cavities in the designed QBA lattice of 3 GeV Taiwan Photon Source

2010

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“…This will impart a transverse momentum to the bunch which causes the bunch to rotate as it travels along the beam line. Crab cavities are required for several particle colliders such as KEK-B [2], the International Linear Collider (ILC) [3], the LHC upgrade [4], and CLIC [5], and also a number of light sources such as the Argonne light source, ALS [6].…”

Section: Introductionmentioning

confidence: 99%

Anticrab cavities for the removal of spurious vertical bunch rotations caused by crab cavities

Latina

Schulte

McIntosh

2008

Phys. Rev. ST Accel. Beams

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Many particle accelerators are proposing the use of crab cavities to correct for accelerator crossing angles or for the production of short bunches in light sources. These cavities produce a rotation to the bunch in a well-defined polarization plane. If the plane of the rotation does not align with the horizontal axis of the accelerator, the bunch will receive a small amount of spurious vertical bunch rotation. For accelerators with small vertical beam sizes and large beam-beam effects, this can cause significant unwanted effects. In this paper we propose the use of a 2nd smaller crab cavity in the vertical plane in order to cancel this effect and investigate its use in numerical simulations.

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“…For ALS at LBNL, preliminary studies indicate that up to 2 MV deflecting voltage at 1.5 GHz is required for 1.9 GeV electron beam [2] . Limited by the peak magnetic field, three to four cells superconducuting RF structures may be required to achieve 2 MV deflecting voltage at 1.5 GHz [3] .…”

Section: Introductionmentioning

confidence: 99%

LOM and HOM damping study in a superconducting deflecting cavity for ALS at LBNL

et al. 2008

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Superconducting deflecting cavities can be used in synchrotron light source to generate subpicosecond X-ray pulses while the impedance of the lower order modes (LOM) and higher order modes (HOM) in the cavity should be kept below an accepted level to avoid beam instability. These modes can be damped by adding waveguide on beam pipe. Detailed simulation of Q in CST Microwave Studio is introduced and experiment results on an aluminum model cavity with damping waveguide are reported to make a comparison.

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Generation of Picosecond X-Ray Pulses in the ALS Using RF Orbit Deflection

Cited by 4 publications

References 8 publications

Utilization of transverse deflecting RF cavities in the designed QBA lattice of 3 GeV Taiwan Photon Source

Utilization of transverse deflecting RF cavities in the designed QBA lattice of 3 GeV Taiwan Photon Source

Anticrab cavities for the removal of spurious vertical bunch rotations caused by crab cavities

LOM and HOM damping study in a superconducting deflecting cavity for ALS at LBNL

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