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Title: An elliptical wiggler beamline for the ALS

Abstract

A beamline for circularly polarized radiation produced by an elliptical wiggler has been designed at the ALS covering the broad energy range from 50 eV to 2000 eV. The rigorous theory of grating diffraction efficiency has been used to maximize transmitted flux. The nature of the elliptical wiggler insertion device creates a challenging optical problem due to the large source size in the vertical and horizontal directions. The requirement of high resolving power, combined with the broad tuning range and high heat loads complicate the design. These problems have been solved by using a variable included angle monochromator of the ``constant length`` type with high demagnification onto its entrance slit, and cooled optics.

Authors:
 [1]; ;  [2]
  1. Lawrence Berkeley Lab., CA (United States)|[Inst. of Microelectronics Technology, Chernogolovka (Russia)
  2. Lawrence Berkeley Lab., CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
197802
Report Number(s):
LBL-37815; LSBL-289; CONF-9510119-7
ON: DE96004325; TRN: 96:008277
DOE Contract Number:
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: SRI `95: synchrotron radiation instrumentation symposium and the 7. users meeting for the advanced photon source (APS), Argonne, IL (United States), 16-20 Oct 1995; Other Information: PBD: Oct 1995
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; WIGGLER MAGNETS; DESIGN; ADVANCED LIGHT SOURCE; BEAM OPTICS; CIRCULAR CONFIGURATION; POLARIZATION; MONOCHROMATORS

Citation Formats

Martynov, V.V., McKinney, W.R., and Padmore, H.A. An elliptical wiggler beamline for the ALS. United States: N. p., 1995. Web.
Martynov, V.V., McKinney, W.R., & Padmore, H.A. An elliptical wiggler beamline for the ALS. United States.
Martynov, V.V., McKinney, W.R., and Padmore, H.A. Sun . "An elliptical wiggler beamline for the ALS". United States. doi:. https://www.osti.gov/servlets/purl/197802.
@article{osti_197802,
title = {An elliptical wiggler beamline for the ALS},
author = {Martynov, V.V. and McKinney, W.R. and Padmore, H.A.},
abstractNote = {A beamline for circularly polarized radiation produced by an elliptical wiggler has been designed at the ALS covering the broad energy range from 50 eV to 2000 eV. The rigorous theory of grating diffraction efficiency has been used to maximize transmitted flux. The nature of the elliptical wiggler insertion device creates a challenging optical problem due to the large source size in the vertical and horizontal directions. The requirement of high resolving power, combined with the broad tuning range and high heat loads complicate the design. These problems have been solved by using a variable included angle monochromator of the ``constant length`` type with high demagnification onto its entrance slit, and cooled optics.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 1995},
month = {Sun Oct 01 00:00:00 EDT 1995}
}

Conference:
Other availability
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  • A beamline for circularly polarized radiation produced by an elliptical wiggler has been designed at the ALS. It covers a broad energy range from 50 eV to 2,000 eV. The rigorous theory of grating diffraction efficiency has been used to maximize throughput. This ia challenging optical problem due to the nature of the elliptical wiggler insertion device. The wiggler has a large source size din the vertical and horizontal directions, and the monochromator requires high resolution (small slits), a wide tuning range, and cooling for high heat loads. These problems have been solved by using a variable included angle monochromatormore » with high demagnification onto the entrance slit, aberration correction of the grating for the large vertical aperture, and cooled optics.« less
  • A beamline for circularly polarized radiation produced by an elliptical wiggler has been designed at the ALS covering the broad energy range from 50 eV to 2000 eV. The rigorous theory of grating diffraction efficiency has been used to maximize transmitted flux. The nature of the elliptical wiggler insertion device creates a challenging optical problem due to the large source size in the vertical and horizontal directions. The requirement of high resolving power combined with the broad tuning range and high heat loads complicate the design. These problems have been solved by using cooled optics and a variable-included angle monochromatormore » of the {open_quote}{open_quote}constant length{close_quote}{close_quote} type with high demagnification onto its entrance slit. {copyright} {ital 1996 American Institute of Physics.}« less
  • The elliptical wiggler is a circularly polarized light source capable of providing very broad spectral coverage and high degree of circular polarization. The main features of an elliptical wiggler can be understood through analogy to bending magnet radiation. However, some aspects, such as the end structure`s influence on the degree of circular polarization, require more elaborate methods to characterize. We present an algorithm based on the stationary phase method, which allows calculation of radiation properties from an arbitrary electron trajectory; so a non-sinusoidal magnetic field`s influence on the radiation performance can be taken into account. We show general radiation propertiesmore » of an ellilptical wiggler and discuss factors affecting radiation performance. Practice issues encountered during the conceptual design of an ellilptical wiggler at the Advanced Light Source are addressed.« less
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  • No abstract prepared.