A: Recently Bunch Shape Monitors have been developed for linear accelerators of several laboratories: CERN, GSI, FRIB MSU, ESS ERIC. Each accelerator has specific demands for phase resolution, mechanical design and operating conditions of the monitor. An overview of the most interesting features of the monitors is presented. Some results of laboratory tests and on-site commissioning are discussed.
K: Beam dynamics; Beam-line instrumentation (beam position and profile monitors; beam-intensity monitors; bunch length monitors); Radiation-induced secondary-electron emission 1Corresponding author.
The beam self-cleaning phenomenon is theoretically predicted by the two-dimensional nonlinear Schrödinger equation, which describes self-focusing, and is observed in the case of femtosecond laser filamentation in the collimated regime of propagation. However, the impact of external focusing on the self-cleaning has not been investigated so far. In this paper we systematically study this impact in a wide range of focusing conditions. We show that the energy range, in which self-cleaning can be observed, shrinks monotonically with the numerical aperture growth at some point vanishing at all.
The degree of space charge compensation of a 70 mA, 400 keV pulsed hydrogen ion beam has been measured with the use of an electrostatic energy analyzer of secondary ions. The large azimuthal angle of the analyzer enables a high responsivity, defined as the ratio of the slow secondary ion current emerging from the partially-compensated ion beam to the fast ion beam current. We measured 84% space charge compensation of the ion beam. The current from the slow ions and the rise time from the degree of space charge compensation were measured and compared with expected values.
K: Beam-line instrumentation (beam position and profile monitors; beam-intensity monitors; bunch length monitors); Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS))1Corresponding author.
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