High Frequency Electro-Optic Beam Position Monitors for Intra-Bunch Diagnostics at the LHC
- Gibson, Stephen
- Arteche, Alberto
- Boorman, Gary
- Bosco, Alessio
- Darmedru, Pierre-Yves
- Lefèvre, Thibaut
- Levens, Thomas
DOIAbstract
At the HL-LHC, proton bunches will be rotated by crab-cavities close to the interaction regions to maximize the luminosity. A method to rapidly monitor the transverse position of particles within each 1ns bunch is required. A novel, compact beam diagnostic to measure the bunch rotation is under development, based on electro-optic crystals, which have sufficient time resolution (<50ps) to monitor intra-bunch perturbations. The electro-optic beam position monitor uses two pairs of crystals, mounted on opposite sides of the beam pipe, whose birefringence is modified by the electric field of passing charged particle beam. The change of birefringence depends on the electric field which itself depends on the beam position, and is measured using p...
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