Beta Function Measurement in the Tevatron Using Quadrupole Gradient Modulation

Early in Run2, there was an effort to compare the different emittance measurements in the Tevatron (flying wires and synchtotron light) and understand the origin of the observed differences. To measure the beta function at a few key locations near the instruments, air-core quadrupoles were installed...

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Bibliographic Details
Published inProceedings of the 2005 Particle Accelerator Conference pp. 2272 - 2274
Main Authors Jansson, A., Lebrun, P., Volk, J.T.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2005
Subjects
Coils
Current measurement
Extraterrestrial measurements
Instruments
Lattices
Magnetic modulators
Magnets
Optical modulation
Resonance
Wires
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Summary:Early in Run2, there was an effort to compare the different emittance measurements in the Tevatron (flying wires and synchtotron light) and understand the origin of the observed differences. To measure the beta function at a few key locations near the instruments, air-core quadrupoles were installed. By modulating the gradient of these magnets and measuring the effect on the tune, the lattice parameters can be extracted. Initially, the results seem to disagree with with other methods. At the time, the lattice was strongly coupled due to a skew component in the main dipoles, caused by sagging of the cryostat. After a large fraction of the superconducting magnets were shimmed to remove a strong skew quadrupole component, the results now agree with the theoretical values to within 20%.
ISBN:9780780388598
0780388593
ISSN:1944-4680
2152-9582
DOI:10.1109/PAC.2005.1591080