Long-range beam-beam (LRBB) interactions can be a source of emittance growth and beam losses in the LHC during physics and will become even more relevant with the smaller beta* and higher bunch intensities foreseen for the High Luminosity LHC upgrade (HL-LHC), in particular if operated without crab-cavities. Both beam losses and emittance growth could be mitigated by compensating the non-linear LRBB kick with a correctly placed current carrying wire. Such a compensation scheme is currently being studied in the LHC through a demonstration test using current-bearing Wires embedded into collimator jaws, installed either side of the high luminosity interaction regions.
Following the LRBB mini-workshop in Lyon, in December 2015, we will review the machine configuration for the experiment with Wires planned in 2017, with the 2 Wires being installed in IP5 during the EYETS 2016-17.
In particular, basing on simulations and previous LRBB experiments, we would like to come to the definition of the operational parameters, the instrumentation, machine settings. We will be discussing LHC optics and parameter space in term of intensity, emittances, chromaticity, octupole current, damper gain, machine parameters envelope (collimator settings, maximum beam intensity for the weak beam, time spent with wire close to beam . . .), observables expected from simulations, instrumentation required and detection limits (or in turn the minimum bunch intensity to be able to measure the effect of the wire), other causes of beam losses or tune shift that may mask the effect of the wire, measurements needed prior the dedicated experiment, minimum time required . . .
