Speaker
Alexander Temnykh
(Cornell University)
Description
Interaction region of Cornell Electron Storage Ring (CESR) electron-positron
collider consists of two permanent and four superconducting quadrupole magnets.
During summer shutdown of 2003 all these magnets were realigned using vibrating
wire (VW) technique. In situ we measured magnetic center position of the magnets
analyzing standing waves excited by Lorentz forces on the wire stretched through
the interaction region. Then the data was used for precise alignment of the magnets
and for beam trajectory calculation.
Although the precision of the magnetic center position measurement was better
than 0.025mm, the difficulties of accurate moving of the magnets reduced the
overall alignment precision to ~0.08mm in horizontal plane and ~0.14mm in vertical.
The following beam based measurement confirmed the high-quality alignment of the
CESR interaction region quadrupole magnets.
In presentation we will discus theory, setup, alignment procedure and results.
Author
Alexander Temnykh
(Cornell University)
Co-author
Scott Chapman
(Cornell University)
