Author/Authors :
Dehning، نويسنده , , B and Matheson، نويسنده , , J and Mugnai، نويسنده , , G and Reichel، نويسنده , , I and Schmidt، نويسنده , , R and Sonnemann، نويسنده , , P.K. and Tecker، نويسنده , , F، نويسنده ,
Abstract :
We describe a beam-based method for finding the relative offset between beam position monitors (BPMs) and the magnetic centres of the adjacent quadrupole magnets. The strength of a given quadrupole is modulated and the induced closed orbit oscillation measured for different beam positions, reaching a minimum when the beam is centred in the quadrupole. The BPM reading at this point is a measure of its offset, which may be determined at LEP with an accuracy of ∼40 μm.
