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Title: Undulator Beam Pipe Magnetic Shielding Effect Tests

Abstract

The proposed stainless steel beampipe for the LCLS undulator has a measurable shielding effect on the magnetic field of the LCLS undulators. This note describes the tests used to determine the magnitude of the shielding effect, as well as deviations in the shielding effect caused by placing different phase shims in the undulator gap. The effect of the proposed Steel strongback which will be used to support the beam pipe, was also studied. A hall probe on a 3 axis movement system was set up to measure the main component of the magnetic field in the Prototype Undulator. To account for temperature variations of the magnetic field of the undulator for successive tests, a correction is applied which is described in this technical note. Using this method, we found the shielding effect, the amount which the field inside the gap was reduced due to the placement of the beampipe, to be {approx}10 Gauss. A series of tests was also performed to determine the effect of phase shims and X and Y correction shims on the shielding. The largest effect on shielding was found for the .3 mm phase shims. The effect of the .3 mm phase shims was to increasemore » the shielding effect {approx}4 Gauss. The tolerance for the shielding effect of the phase shims is less than 1 gauss. The effect of the strongback was seen in its permanent magnetic field. It introduced a dipole field across the measured section of the undulator of {approx}3 gauss. This note documents the tests performed to determine these effects, as well as the results of those tests.« less

Authors:
;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
993417
Report Number(s):
SLAC-TN-10-044
TRN: US1008133
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; DIPOLES; MAGNETIC FIELDS; MAGNETIC SHIELDING; PROBES; SHIELDING; STAINLESS STEELS; STEELS; TOLERANCE; WIGGLER MAGNETS; XFEL

Citation Formats

Fisher, Andrew, Wolf, Zachary, and /SLAC. Undulator Beam Pipe Magnetic Shielding Effect Tests. United States: N. p., 2010. Web. doi:10.2172/993417.
Fisher, Andrew, Wolf, Zachary, & /SLAC. Undulator Beam Pipe Magnetic Shielding Effect Tests. United States. https://doi.org/10.2172/993417
Fisher, Andrew, Wolf, Zachary, and /SLAC. 2010. "Undulator Beam Pipe Magnetic Shielding Effect Tests". United States. https://doi.org/10.2172/993417. https://www.osti.gov/servlets/purl/993417.
@article{osti_993417,
title = {Undulator Beam Pipe Magnetic Shielding Effect Tests},
author = {Fisher, Andrew and Wolf, Zachary and /SLAC},
abstractNote = {The proposed stainless steel beampipe for the LCLS undulator has a measurable shielding effect on the magnetic field of the LCLS undulators. This note describes the tests used to determine the magnitude of the shielding effect, as well as deviations in the shielding effect caused by placing different phase shims in the undulator gap. The effect of the proposed Steel strongback which will be used to support the beam pipe, was also studied. A hall probe on a 3 axis movement system was set up to measure the main component of the magnetic field in the Prototype Undulator. To account for temperature variations of the magnetic field of the undulator for successive tests, a correction is applied which is described in this technical note. Using this method, we found the shielding effect, the amount which the field inside the gap was reduced due to the placement of the beampipe, to be {approx}10 Gauss. A series of tests was also performed to determine the effect of phase shims and X and Y correction shims on the shielding. The largest effect on shielding was found for the .3 mm phase shims. The effect of the .3 mm phase shims was to increase the shielding effect {approx}4 Gauss. The tolerance for the shielding effect of the phase shims is less than 1 gauss. The effect of the strongback was seen in its permanent magnetic field. It introduced a dipole field across the measured section of the undulator of {approx}3 gauss. This note documents the tests performed to determine these effects, as well as the results of those tests.},
doi = {10.2172/993417},
url = {https://www.osti.gov/biblio/993417}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 23 00:00:00 EST 2010},
month = {Tue Nov 23 00:00:00 EST 2010}
}