The Transverse Wakefield and Beam Break-up ..................... -4.1 The Transverse Wake ................................ 9 9 4.2 Transverse Beam Break-up and ‘Landau Damping’ . . . . . . . . . . . . . . . Pulse to Pulse Changes: Jitter ............................ 5.1 Injection Jitter .................................. 5.2 Quadrupole Alignment Jitter ........................... 5.3 Jitter of ...

By means of a general theory we examine the Sands and Rees method of measurement of the longitudinal coupling impedance between a particle beam and the vacuum chamber components. We discuss the validity limits of the method in relation to the presence of the central wire which simulates the beam.

We report the first experimental demonstration of two-dimensional spatial solitary waves in secondorder nonlinear optical material. When an intense optical beam is focused into a phase-matchable second-order nonlinear material, the fundamental and generated second-harmonic fields are mutually trapped as a result of the strong nonlinear coupling which counteracts both diffraction and beam walkoff.

We investigate, both theoretically and experimentally, the phenomenon of polarization rotation of a weak, linearly-polarized optical (probe) field in an atomic system with multiple three-level electromagnetically induced transparency (EIT) sub-systems. The polarization rotation angle can be controlled by a circularly-polarized coupling beam, which breaks the symmetry in number of EIT subsystems...

* Work supported by the U.S. Department of Energy under Contract DE-AC02-76SF00515. Abstract In future linear colliders the luminosity will depend on maintaining the small emittance aspect ratio delivered by damping rings. Correction of cross-plane coupling can be important in preventing dilution of the beam emittance. In order to minimize the vertical emittance, especially for a flat beam, it ...

Diffraction gratings have been proposed as core optical elements in future laser interferometric gravitational-wave detectors. In this paper, we derive equations for the coupling between alignment noise and phase noise at diffraction gratings. In comparison to a standard reflective component (mirror or beam splitter) the diffractive nature of the gratings causes an additional coupling of geomet...

The front-end optical design for band 9 (600 to 720GHz) of the Atacama Large Millimeter Array (ALMA) is now completed and verified. A frequency independent design approach is used to couple radiation to the two orthogonal polarized mixed detectors from the large 12m ALMA Cassegrain telescope. As it is a heterodyne receiver, two local oscillator beam paths are integrated into the front-end optic...

The upgrade of the SIS18 to become the injector of the SIS100 requires beam loss control/limitation at the percent level [1]. The storage of high intensity beams needs careful choice of the working point and of compensation of the resonances crossing the beam space charge tune spread (as large as ∆Q ∼ 0.5). However, the linear coupling may be useful for balancing beam emittances and improving m...

In this paper the vibration and the traveling wave in a coupled magneto-elastic beam system are discussed experimentally. The vibration excited by the periodical forcing at the beam system propagates to another as a wave through the coupling elastic beams. Each magneto-elastic beam shows the variety of vibrations caused by the nonlinearity of the potential well and the wave propagation with tim...