2011 Particle Accelerator Conference - List of Authors (Jaski, M.S.)

Paper	Title	Page
TUP188	A New Power Supply System for the IEX Project at the APS	1178
	B. Deriy, M.S. Jaski, J. Wang ANL, Argonne, USA
	A new beamline providing circularly polarized x-rays that will cover photon energies from 250 eV to 2.5 keV is under development at the APS. Because of the unique requirements of the circular polarizing undulator constructed for this beamline, a new power supply system design is required. The undulator will contain twelve sets of electromagnetic coils – two main, two quasi-periodic, and eight correctors. The undulator will incorporate variable polarization control and reduction of the magnetic fields at so-called quasi-periodic pole locations for the purpose of suppressing the higher-order radiation harmonics. The challenges met in the power supply system design for the project will be discussed.

TUP240	Coil Energizing Patterns for an Electromagnetic Variably Polarizing Undulator	1277
	R.J. Dejus, M.S. Jaski, E.R. Moog ANL, Argonne, USA S. Sasaki HSRC, Higashi-Hiroshima, Japan
	Funding: The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). A new electromagnetic insertion device optimized for producing intense soft x-rays of variable polarization is under construction at the Advanced Photon Source. Most of the coil packs are powered by a main power supply; a few are powered separately so that magnetic fields at certain pole positions can be different. The undulator radiation depends sensitively on the chosen magnetic field pattern, and higher spectral harmonics may be shifted in energy. For some beamline experiments, it is important to reduce the so-called higher-order contamination to increase the signal-to-noise ratio. We present spectra and power densities calculated directly from realistic magnetic fields and discuss coil energizing patterns. Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

TUP244	Magnetic Simulation of an Electromagnetic Variably Polarizing Undulator *	1289
	M.S. Jaski, R.J. Dejus, E.R. Moog ANL, Argonne, USA
	Development of an all-electromagnetic variable polarizing undulator is underway at the Advanced Photon Source (APS). This device has a set of Bx poles and coils and a set of By poles and coils. The Bx coils are powered separately from the By coils. Modifying the geometry of the Bx coils or poles changes not only the Bx field but changes the By field as well and vice-versa. Magnetic modeling with OPERA 3-D software was used to optimize the coil and pole geometries. Results of the magnetic field simulation and optimization are presented in this paper. * Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under contract number DE-AC02-06CH11357.

WEP064	Beam Dynamics Study of the Intermediate Energy X-Ray Wiggler for the Advanced Photon Source	1594
	A. Xiao, M. Borland, L. Emery, M.S. Jaski, V. Sajaev ANL, Argonne, USA
	Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. An intermediate-energy x-ray (IEX) helical wiggler is planned for the APS storage ring. Because of its high field and rapid field roll-off, the disturbance to the beam dynamics is large and needs to be well understood before the installation. We present a new method of fitting the magnetic field to an analytical wiggler model, which simplifies the usual nonlinear fitting problem and guarantees the best fit. The fitting method was validated by comparison to an analytical method.

Paper

Title

Page

A New Power Supply System for the IEX Project at the APS

1178

B. Deriy, M.S. Jaski, J. Wang
ANL, Argonne, USA

A new beamline providing circularly polarized x-rays that will cover photon energies from 250 eV to 2.5 keV is under development at the APS. Because of the unique requirements of the circular polarizing undulator constructed for this beamline, a new power supply system design is required. The undulator will contain twelve sets of electromagnetic coils – two main, two quasi-periodic, and eight correctors. The undulator will incorporate variable polarization control and reduction of the magnetic fields at so-called quasi-periodic pole locations for the purpose of suppressing the higher-order radiation harmonics. The challenges met in the power supply system design for the project will be discussed.

TUP240

Coil Energizing Patterns for an Electromagnetic Variably Polarizing Undulator

1277

R.J. Dejus, M.S. Jaski, E.R. Moog
ANL, Argonne, USA
S. Sasaki
HSRC, Higashi-Hiroshima, Japan

Funding: The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”).
A new electromagnetic insertion device optimized for producing intense soft x-rays of variable polarization is under construction at the Advanced Photon Source. Most of the coil packs are powered by a main power supply; a few are powered separately so that magnetic fields at certain pole positions can be different. The undulator radiation depends sensitively on the chosen magnetic field pattern, and higher spectral harmonics may be shifted in energy. For some beamline experiments, it is important to reduce the so-called higher-order contamination to increase the signal-to-noise ratio. We present spectra and power densities calculated directly from realistic magnetic fields and discuss coil energizing patterns.
Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

TUP244

Magnetic Simulation of an Electromagnetic Variably Polarizing Undulator *

1289

M.S. Jaski, R.J. Dejus, E.R. Moog
ANL, Argonne, USA

Development of an all-electromagnetic variable polarizing undulator is underway at the Advanced Photon Source (APS). This device has a set of Bx poles and coils and a set of By poles and coils. The Bx coils are powered separately from the By coils. Modifying the geometry of the Bx coils or poles changes not only the Bx field but changes the By field as well and vice-versa. Magnetic modeling with OPERA 3-D software was used to optimize the coil and pole geometries. Results of the magnetic field simulation and optimization are presented in this paper.
* Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under contract number DE-AC02-06CH11357.

WEP064

Beam Dynamics Study of the Intermediate Energy X-Ray Wiggler for the Advanced Photon Source

1594

A. Xiao, M. Borland, L. Emery, M.S. Jaski, V. Sajaev
ANL, Argonne, USA

Funding: Work supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
An intermediate-energy x-ray (IEX) helical wiggler is planned for the APS storage ring. Because of its high field and rapid field roll-off, the disturbance to the beam dynamics is large and needs to be well understood before the installation. We present a new method of fitting the magnetic field to an analytical wiggler model, which simplifies the usual nonlinear fitting problem and guarantees the best fit. The fitting method was validated by comparison to an analytical method.