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Title: Measurements of the Beam Induced Heat Load at the ANKA Superconductive Undulator

Abstract

Several theoretical papers tried to estimate the magnitude of the different possible effects heating a cold-bore small gap undulator: synchrotron radiation from upstream magnets, image currents and synchrotron radiation produced in the undulator. Measurements performed with the superconducting undulator installed in ANKA show that the dominating heating mechanism is diffuse synchrotron radiation generated in the upstream magnets: about 1 W/ 100 mA stored current at 2.5 GeV at a gap height of 8 mm. This rather low level can presumably be reduced further by modifying the collimating system at the entrance of the undulator.

Authors:
; ; ;  [1]; ; ;  [2]; ;  [3];  [1];  [4]
  1. Institute for Synchrotron Radiation, Research Center Karlsruhe (Germany)
  2. Physics Institute II, Friedrich Alexander University Erlangen -Nuernberg (Germany)
  3. Faculty of Physics, University of Karlsruhe (Germany)
  4. (Germany)
Publication Date:
OSTI Identifier:
21052527
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 879; Journal Issue: 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2436075; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM CURRENTS; BEAM OPTICS; GEV RANGE; HEATING LOAD; MEASURING METHODS; SUPERCONDUCTING MAGNETS; SYNCHROTRON RADIATION; WIGGLER MAGNETS

Citation Formats

Casalbuoni, S., Hagelstein, M., Kostka, B., Rossmanith, R., Schoeck, F., Weisser, M., Steffens, E., Bernhard, A., Wollmann, D., Baumbach, T., and Faculty of Physics, University of Karlsruhe. Measurements of the Beam Induced Heat Load at the ANKA Superconductive Undulator. United States: N. p., 2007. Web. doi:10.1063/1.2436075.
Casalbuoni, S., Hagelstein, M., Kostka, B., Rossmanith, R., Schoeck, F., Weisser, M., Steffens, E., Bernhard, A., Wollmann, D., Baumbach, T., & Faculty of Physics, University of Karlsruhe. Measurements of the Beam Induced Heat Load at the ANKA Superconductive Undulator. United States. doi:10.1063/1.2436075.
Casalbuoni, S., Hagelstein, M., Kostka, B., Rossmanith, R., Schoeck, F., Weisser, M., Steffens, E., Bernhard, A., Wollmann, D., Baumbach, T., and Faculty of Physics, University of Karlsruhe. Fri . "Measurements of the Beam Induced Heat Load at the ANKA Superconductive Undulator". United States. doi:10.1063/1.2436075.
@article{osti_21052527,
title = {Measurements of the Beam Induced Heat Load at the ANKA Superconductive Undulator},
author = {Casalbuoni, S. and Hagelstein, M. and Kostka, B. and Rossmanith, R. and Schoeck, F. and Weisser, M. and Steffens, E. and Bernhard, A. and Wollmann, D. and Baumbach, T. and Faculty of Physics, University of Karlsruhe},
abstractNote = {Several theoretical papers tried to estimate the magnitude of the different possible effects heating a cold-bore small gap undulator: synchrotron radiation from upstream magnets, image currents and synchrotron radiation produced in the undulator. Measurements performed with the superconducting undulator installed in ANKA show that the dominating heating mechanism is diffuse synchrotron radiation generated in the upstream magnets: about 1 W/ 100 mA stored current at 2.5 GeV at a gap height of 8 mm. This rather low level can presumably be reduced further by modifying the collimating system at the entrance of the undulator.},
doi = {10.1063/1.2436075},
journal = {AIP Conference Proceedings},
number = 1,
volume = 879,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}
  • A beam test of a superconductive undulator (100 periods, 14 mm period length) is in preparation at the 2.5 GeV storage ring ANKA in Karlsruhe. The aim of this test is to study the behaviour of a cold-bore superconductive undulator in a storage ring (study of the influence of the beam induced heating and heating by synchrotron radiation from downstream magnets) and to conduct an analysis of the quality of the emitted spectrum. A coil at the entrance and a single superconductive dipole correction coil covering the whole undulator is provided to minimize the first and second integral. A sectionmore » of this paper is devoted to the discussion of a more elaborate correction system for future undulators.« less
  • In spring 2005 the worldwide first cold-bore superconductive undulator was installed in the storage ring ANKA. In this paper the obtained results concerning the measured spectra and the heat load from the beam are described. Future developments in the field on superconductive undulators at ANKA are summarized.
  • A set of horizontal and vertical white-beam slits has been designed for the Advanced Photon Source wiggler/undulator beamlines at Argonne National Laboratory. While this slit set can handle the high heat flux from one APS undulator source, it has a large enough aperture to be compatible with a wiggler source also. A grazing-incidence, knife-edge configuration has been used in the design to eliminate downstream x-ray scattering. Enhanced heat transfer technology has been used in the water-cooling system. A unique stepping parallelogram driving structure provides precise vertical slit motion with large optical aperture. The full design detail is presented in thismore » paper.« less
  • A fixed primary aperture has been designed and built to limit the angular extent of radiation from an APS undulator onto a liquid nitrogen-cooled monochromator crystal. The design combines high heat load capability, simplicity and ease of manufacture, and integral thermal beam position monitors. The aperture is designed to absorb 9 kW, the amount produced by the APS undulator A at 300 mA beam current after passing through apertures in the front end. The device consists of a Cu-cylinder of 150 mm length and about 90 mm diameter with a tapered rectangular opening converging to 4 mm{times}2 mm (horizontal{times}vertical) atmore » the narrowest point. Radial saw cuts along the cylinder axis from the outside in create fins which provide a large Cu-to-water interface. A cylindrical shell with water inlet and outlet manifolds is brazed to the outside of the cylinder. Conflat flanges are brazed to both ends for vacuum connection. Thermocouples inserted into holes drilled through the fins from top, bottom, left and right at the location of the narrowest opening provide differential temperature readings which are calibrated and translated into beam position. Sensitivity is heat load dependent and better than 0.1 mm at small and medium undulator gaps and better than 0.2 mm even at large gaps.{copyright} {ital 1997 American Institute of Physics.}« less
  • A fixed primary aperture has been designed and built to limit the angular extent of radiation from an APS undulator onto a liquid nitrogen-cooled monochromator crystal. The design combines high heat load capability, simplicity and ease of manufacture, and integral thermal beam position monitors. The aperture is designed to absorb 9 kW, the amount produced by the APS undulator A at 300 mA beam current after passing through apertures in the front end. The device consists of a Cu-cylinder of 150 mm length and about 90 mm diameter with a tapered rectangular opening converging to 4 mmx2 mm (horizontalxvertical) atmore » the narrowest point. Radial saw cuts along the cylinder axis from the outside in create fins which provide a large Cu-to-water interface. A cylindrical shell with water inlet and outlet manifolds is brazed to the outside of the cylinder. Conflat flanges are brazed to both ends for vacuum connection. Thermocouples inserted into holes drilled through the fins from top, bottom, left and right at the location of the narrowest opening provide differential temperature readings which are calibrated and translated into beam position. Sensitivity is heat load dependent and better than 0.1 mm at small and medium undulator gaps and better than 0.2 mm even at large gaps.« less