Title :
Determination of the particle momentum in LEP from precise magnet measurements
Author :
Billan, J. ; Gourber, J.P. ; Henrichsen, K.N.
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
The absolute beam energy of LEP (Large Electron-Positron Collider) is obtained by measuring the magnetic field in a reference dipole connected in series with the bending magnets of the machine. Periodic calibrations are carried out by measuring flux variations in a one-turn induction coil embedded in the lower pole of all bending magnets. The measurement equipment is described and the results of periodic calibrations are reported. This work illustrates the value of systematic magnetic measurements of accelerator magnets. The measurement results not only provided a precise knowledge of the beam energy, but also permitted the sorting and subsequent positioning of magnets in the machine in a cost-efficient way.<>
Keywords :
electron accelerators; magnetic field measurement; particle beam diagnostics; storage rings; synchrotrons; LEP; absolute beam energy; bending magnets; flux variations; magnetic field; magnetic measurements; measurement equipment; one-turn induction coil; particle momentum; reference dipole; Accelerator magnets; Calibration; Coils; Colliding beam devices; Energy measurement; Magnetic field measurement; Magnetic flux; Magnetic variables measurement; Particle beam measurements; Position measurement;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164886
