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Title: Vibration Measurements to Study the Effect of Cryogen Flow in Superconducting Quadrupole.

Abstract

The conceptual design of compact superconducting magnets for the International Linear Collider final focus is presently under development. A primary concern in using superconducting quadrupoles is the potential for inducing additional vibrations from cryogenic operation. We have employed a Laser Doppler Vibrometer system to measure the vibrations in a spare RHIC quadrupole magnet under cryogenic conditions. Some preliminary results of these studies were limited in resolution due to a rather large motion of the laser head as well as the magnet. As a first step towards improving the measurement quality, a new set up was used that reduces the motion of the laser holder. The improved setup is described, and vibration spectra measured at cryogenic temperatures, both with and without helium flow, are presented.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
924429
Report Number(s):
BNL-79827-2008-CP
R&D Project: 18051; KB0202011; TRN: US0802257
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: Particle Accelerator Conference 2007 (PAC 2007); Albuquerque, New Mexico; 20070625 through 20070629
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; CRYOGENIC FLUIDS; CRYOGENICS; DESIGN; HELIUM; LASERS; LINEAR COLLIDERS; MAGNETS; QUADRUPOLES; RESOLUTION; SPECTRA; SUPERCONDUCTING MAGNETS

Citation Formats

He,P., Anerella, M., aydin, S., Ganetis, G. Harrison, M., Jain, A., and Parker, B. Vibration Measurements to Study the Effect of Cryogen Flow in Superconducting Quadrupole.. United States: N. p., 2007. Web.
He,P., Anerella, M., aydin, S., Ganetis, G. Harrison, M., Jain, A., & Parker, B. Vibration Measurements to Study the Effect of Cryogen Flow in Superconducting Quadrupole.. United States.
He,P., Anerella, M., aydin, S., Ganetis, G. Harrison, M., Jain, A., and Parker, B. 2007. "Vibration Measurements to Study the Effect of Cryogen Flow in Superconducting Quadrupole.". United States. doi:. https://www.osti.gov/servlets/purl/924429.
@article{osti_924429,
title = {Vibration Measurements to Study the Effect of Cryogen Flow in Superconducting Quadrupole.},
author = {He,P. and Anerella, M. and aydin, S. and Ganetis, G. Harrison, M. and Jain, A. and Parker, B.},
abstractNote = {The conceptual design of compact superconducting magnets for the International Linear Collider final focus is presently under development. A primary concern in using superconducting quadrupoles is the potential for inducing additional vibrations from cryogenic operation. We have employed a Laser Doppler Vibrometer system to measure the vibrations in a spare RHIC quadrupole magnet under cryogenic conditions. Some preliminary results of these studies were limited in resolution due to a rather large motion of the laser head as well as the magnet. As a first step towards improving the measurement quality, a new set up was used that reduces the motion of the laser holder. The improved setup is described, and vibration spectra measured at cryogenic temperatures, both with and without helium flow, are presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2007,
month = 6
}

Conference:
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  • A new superconducting quadrupole magnet for linear accelerators was fabricated at Fermilab. The magnet is designed to work inside a cryomodule in the space between SCRF cavities. SCRF cavities must be installed inside a very clean room adding issues to the magnet design, and fabrication. The designed magnet has a splittable along the vertical plane configuration and could be installed outside of the clean room around the beam pipe previously connected to neighboring cavities. For more convenient assembly and replacement a 'superferric' magnet configuration with four racetrack type coils was chosen. The magnet does not have a helium vessel andmore » is conductively cooled from the cryomodule LHe supply pipe and a helium gas return pipe. The quadrupole generates 36 T integrated magnetic field gradient, has 600 mm effective length, and the peak gradient is 54 T/m. In this paper the quadrupole magnetic, mechanical, and thermal designs are presented, along with the magnet fabrication overview and first test results.« less
  • Mechanical vibrations of the superconducting interaction region triplets have been identified as source of horizontal beam jitter around 10 Hz in the Relativistic Heavy Ion Collider (RHIC). Therefore, cold masses inside one triplet cryostat have been equipped with accelerometers to further investigate the phenomenon. Additionally, helium pressure transducers have been installed to determine helium pressure oscillations as a possible primary vibration source. Recent results will be reported.
  • One of the concerns in using compact superconducting magnets in the final focus region of the ILC is the influence of the cryogen flow on the vibration characteristics. As a first step towards characterizing such motion at nanometer levels, a project was undertaken at BNL to measure the vibrations in a spare RHIC quadrupole under cryogenic conditions. Given the constraints of cryogenic operation, and limited space available, it was decided to use a dual head laser Doppler vibrometer for this work. The performance of the laser vibrometer was tested in a series of room temperature tests and compared with resultsmore » from Mark L4 geophones. The laser system was then used to measure the vibration of the cold mass of the quadrupole with respect to the outside warm enclosure. These measurements were carried out both with and without the flow of cold helium through the magnet. The results indicate only a minor increase in motion in the horizontal direction (where the cold mass is relatively free to move).« less
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