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Hollow Electron Lenses (HEL) will be installed at the High Luminosity Large Hadron Collider to provide a continuous and controlled depletion of beam halo particles by interaction with a superimposed hollow electron beam, of intensity as high as 5 A, and radii 1.1–2.2 mm for 7 TeV LHC operations. In this paper, issues related to the propagation of high intensity hollow electron beams are discussed and the simulations of the electron beam dynamics with feedback to the HEL design are presented. The main results are the rise of the electron beam accelerating voltage from 10 kV, as in the initial proposal, to 15 kV and the validation of the 5 T magnetic field at the main solenoids as being sufficient to guarantee a stable electron beam.

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Microwave coaxial switch on p-i-n-diodes is described. The device is a section of a coaxial line with a broken external conductor. The control p-i-n-diodes are embedded into the break (annular gap) of the conductor. A toroidal resonator, the gap of which is in line with the break of the external conductor of the coaxial line, is axially aligned to the line. The device is made in versions with working frequencies of 2450 and 2856 MHz; maximal pulse microwave power of 3 (2А520А p-i-n-diodes), 1 (2А507А), and 0.2 kW (2А509А); and leading edge of microwave pulses of no more than 200, 50, and 30 ns, respectively.