PAC2013 - List of Authors (Abliz, M.)

Paper	Title	Page
WEPSM09	An Electromagnetic Variably Polarizing Quasi-Periodic Undulator	1064
	M.S. Jaski, M. Abliz, R.J. Dejus, B. Deriy, E. Gluskin, E.R. Moog, I. Vasserman, A. Xiao ANL, Argonne, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. An electromagnetic variably polarizing quasi-periodic undulator was installed in the Advanced Photon Source (APS) storage ring in April 2012 and has been successfully commissioned with stored beam. This device is identified as the Intermediate Energy X-ray (IEX) undulator. The IEX undulator takes its name from the IEX beamline where it is installed. The IEX undulator is able to produce a variety of polarizations: linear vertical, linear horizontal, and right- or left-handed elliptical or circular. Ten pairs of poles, distributed quasi-periodically along the undulator length, are powered separately, allowing the field strength of the quasi-periodic poles to be adjusted. This adjustability allows the user to seek a balance between the suppression of the higher harmonics and the loss of flux in the fundamental that best suits the measurement being made. The IEX undulator has a 12.5-cm period and can achieve photon energies as low as 250 eV in horizontal polarization and 440 eV in vertical polarization. A description of the IEX undulator will be presented.

WEPSM10	Design of a 17.2-mm-Period Planar Undulator for the APS	1067
	E.R. Moog, M. Abliz, R.J. Dejus, J.H. Grimmer, M.S. Jaski ANL, Argonne, USA
	Funding: * Work supported by U.S. Department of Energy, Office of Science, under contract number DE-AC02-06CH11357. The design process for a short-period planar undulator is described. This is a conventional planar design based on Nd-Fe-B magnets and vanadium permendur poles. The period length was driven by the users’ request for a high flux of photons at 23.7 keV, with minimal tuning range. A shorter period gives higher flux; 17.2 mm was the shortest value consistent with the gap limitations of the vacuum chamber and with reaching the desired photon energy. Details of the design, especially the various chamfers of edges of the magnet and pole, were examined more closely than has been the standard past practice in order to minimize the period length.

WEPSM11	The Intermediate-Energy X-ray (IEX) Undulator Commissioning Results	1070
	A. Xiao, M. Abliz, B. Deriy, M.S. Jaski, M.L. Smith, I. Vasserman, J.Z. Xu ANL, Argonne, USA
	Funding: Work supported by the U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. Strong beam perturbation from the intermediate-energy x-ray (IEX) undulator operation has been expected from the beginning. This paper describes our efforts including the initial magnet design, field measurements and compensation, special considerations of power supplies and the control system, and the final commissioning results with beam. Perturbations are well within the specified limits, and the IEX was made ready for user operation in less than six months.

Paper

Title

Page

An Electromagnetic Variably Polarizing Quasi-Periodic Undulator

1064

M.S. Jaski, M. Abliz, R.J. Dejus, B. Deriy, E. Gluskin, E.R. Moog, I. Vasserman, A. Xiao
ANL, Argonne, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
An electromagnetic variably polarizing quasi-periodic undulator was installed in the Advanced Photon Source (APS) storage ring in April 2012 and has been successfully commissioned with stored beam. This device is identified as the Intermediate Energy X-ray (IEX) undulator. The IEX undulator takes its name from the IEX beamline where it is installed. The IEX undulator is able to produce a variety of polarizations: linear vertical, linear horizontal, and right- or left-handed elliptical or circular. Ten pairs of poles, distributed quasi-periodically along the undulator length, are powered separately, allowing the field strength of the quasi-periodic poles to be adjusted. This adjustability allows the user to seek a balance between the suppression of the higher harmonics and the loss of flux in the fundamental that best suits the measurement being made. The IEX undulator has a 12.5-cm period and can achieve photon energies as low as 250 eV in horizontal polarization and 440 eV in vertical polarization. A description of the IEX undulator will be presented.

WEPSM10

Design of a 17.2-mm-Period Planar Undulator for the APS

1067

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

Funding: * Work supported by U.S. Department of Energy, Office of Science, under contract number DE-AC02-06CH11357.
The design process for a short-period planar undulator is described. This is a conventional planar design based on Nd-Fe-B magnets and vanadium permendur poles. The period length was driven by the users’ request for a high flux of photons at 23.7 keV, with minimal tuning range. A shorter period gives higher flux; 17.2 mm was the shortest value consistent with the gap limitations of the vacuum chamber and with reaching the desired photon energy. Details of the design, especially the various chamfers of edges of the magnet and pole, were examined more closely than has been the standard past practice in order to minimize the period length.

WEPSM11

The Intermediate-Energy X-ray (IEX) Undulator Commissioning Results

1070

A. Xiao, M. Abliz, B. Deriy, M.S. Jaski, M.L. Smith, I. Vasserman, J.Z. Xu
ANL, Argonne, USA

Funding: Work supported by the U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Strong beam perturbation from the intermediate-energy x-ray (IEX) undulator operation has been expected from the beginning. This paper describes our efforts including the initial magnet design, field measurements and compensation, special considerations of power supplies and the control system, and the final commissioning results with beam. Perturbations are well within the specified limits, and the IEX was made ready for user operation in less than six months.