Accelerator design for the Cornell High Energy Synchrotron Source upgrade

Shanks, James; Barley, J.; Barrett, Steve; Billing, M.; Codner, G.; Li, Yi; Liu, X.; Lyndaker, Aaron; Rice, D.; Rider, N.; Rubin, D.; Temnykh, A.; Wang, S. T.

doi:10.1103/physrevaccelbeams.22.021602

Cited by 13 publications

(11 citation statements)

References 19 publications

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“…The source matrix G 0 for the on-axis radiation of an undulator in a straight section is diagonal and contains the inverse beam variances. A Cornell Compact Undulator [12] has a source brightness of 5.6 × 10 17 photons/mm 2 /mrad 2 /0.1% bandwidth for the considered photon energy at an electron energy of 6 GeV and a current of 200 mA. The deviations of individual rays from the optical axis are assumed to have a normal distribution with standard deviations σ x , σ x , σ z , σ z , σ η and are listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Phase Space Considerations for a microSAXS Beamline Located on a Diamond Laue Side-Bounce Monochromator

Smilgies

2020

Instruments

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Section: Methodsmentioning

confidence: 99%

Phase Space Considerations for a microSAXS Beamline Located on a Diamond Laue Side-Bounce Monochromator

Smilgies

2020

Instruments

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“…The X-ray source (S) has finite dimensions and finite angular divergence. The source characteristics, calculated using the SPECTRA program (Tanaka & Kitamura, 2001) taking into account the parameters of the storage ring (Shanks et al, 2019) and the parameters of the undulator (Temnykh et al, 2013(Temnykh et al, , 2016, are summarized in Table 1.…”

Section: Beamline Layout and Operating Principlesmentioning

confidence: 99%

Side-bounce beamlines using single-reflection diamond monochromators at Cornell High Energy Synchrotron Source

Stoupin

Krawczyk

Sagan

et al. 2021

J Synchrotron Radiat

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The design and implementation of new beamlines featuring side-bounce (single-reflection) diamond monochromators at Cornell High Energy Synchrotron Source (CHESS) are described. Undulator radiation is monochromated using an interchangeable set of diamond crystal plates reflecting radiation in the horizontal (synchrotron) plane, where each crystal plate is set to one of the low-index Bragg reflections (111, 220, 311 and 400) in either Bragg or Laue reflection geometries. At the nominal Bragg angle of 18° these reflections deliver monochromated X-rays with photon energies of 9.7, 15.9, 18.65 and 22.5 keV, respectively. An X-ray mirror downstream of the diamond monochromator is used for rejection of higher radiation harmonics and for initial focusing of the monochromated beam. The characteristics of the X-ray beam entering the experimental station were measured experimentally and compared with the results of simulations. A reasonable agreement is demonstrated. It is shown that the use of selected high-dislocation-density `mosaic' diamond single-crystal plates produced using the chemical vapor deposition method yields a few-fold enhancement in the flux density of the monochromated beam in comparison with that delivered by perfect crystals under the same conditions. At present, the Functional Materials Beamline at CHESS, which is used for time-resolved in situ characterization of soft materials during processing, has been outfitted with the described setup.

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“…Indeed, the original motivation for including the integration method option was not for improved local accuracy, but rather to provide better field calculations in volumes far from the steel, where the mesh may be very coarse. 4 The integration method can be misleading in another way as well. When boundary conditions are defined on symmetry planes in the beam region, the integration method provides an exact constraint by definition, because there are no sources on the constrained plane.…”

Section: Post-processormentioning

confidence: 99%

“…[1,2,3]. Here we use the examples of two types of quadrupole magnet used in the CHESS-U upgrade of the Cornell Electron Storage Ring (CESR) [4]. The 768-m-circumference CESR ring with its injectors is shown schematically in Fig.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment of Finite-element Models for Magnetostatic Field Calculations

Crittenden

2021

Preprint

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We present quantitative means for assessing the numerical accuracy of static magnetic field calculations in finite-element models. Our calculations use the three-dimensional Opera simulation software suite of Dassault Systèmes. Our need to assess the effects of fringe fields requires such a 3D algorithm. While we do discuss and compare our approach to a method of accuracy estimation used in the Opera post-processor, our methods are generally applicable to any model using relaxation techniques in finite-element systems. For purposes of illustration, we present modeling and analysis of two types of quadrupole electromagnets presently in operation in the south arc of the Cornell Electron Storage Ring (CESR). Calculations of field multipole expansion coefficients and numerical deviations from Maxwell's equations in source-free regions are discussed, with emphasis on the dependence of their accuracy on changes to the finiteelement model. Successive refinement steps in the finite-element model for the non-extraction type of CESR south arc quadrupole achieve a reduction in the RMS value of the longitudinal component of the curl vector on the magnet axis by a factor of nearly 70 from 4.38 × 10 −2 T/m to 6.36 × 10 −4 T/m, which is 0.0021% of the field gradient. An accuracy of 2.4% is achieved for a dodecapole coefficient of 2.4 × 10 −4 of that of the quadrupole in the longitudinal integral of the vertical field gradient at a radius of 1 cm.

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Accelerator design for the Cornell High Energy Synchrotron Source upgrade

Cited by 13 publications

References 19 publications

Phase Space Considerations for a microSAXS Beamline Located on a Diamond Laue Side-Bounce Monochromator

Phase Space Considerations for a microSAXS Beamline Located on a Diamond Laue Side-Bounce Monochromator

Side-bounce beamlines using single-reflection diamond monochromators at Cornell High Energy Synchrotron Source

Quantitative Assessment of Finite-element Models for Magnetostatic Field Calculations

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