The huge luminosity increase compared to existing ring colliders is expected by using linear collider concepts. The luminosities of past and existing ee ring colliders have been steadily increased mainly by increasing the beam currents and collision frequencies. The design luminosities of various ee ring colliders are shown in Fig. 1 as function of the beam energy. A main limitation comes from ...

The Beam Transfer Function (BTF) belongs to the most powerful beam diagnostics methods, providing direct measurements of beam stability properties, impedances and various beam and lattice parameters. Here, we report about the first measurement of the transverse BTF and the corresponding stability diagrams in SIS 18. By comparing experimental BTF and stability diagrams with theoretical expressio...

Recent years have seen a great potential of the focused ion beam (FIB) technology for the nanometer-scale patterning of a freestanding two-dimensional (2D) layer. Experimentally determined sputtering yields of the perforation process can be quantitatively explained using the binary collision theory. The main peculiarity of the interaction between the ion beams and the suspended 2D material lies...

The LEP Beam Orbit Measurement system (BOM) allows for the acquisition of the beam position at each Beam Position Monitor (BPM) for over 1000 consecutive turns. By synchronizing the acquisition with a kick given to the beam, we can investigate the behavior of the beam under different conditions. In particular, starting from the data of one BPM, we can apply a simple mathematical manipulation to...

One of the main issues in the generation of a highbrightness electron beam is the preservation of beam emittance. Here we discuss one of possible source of the emittance dilution by the rf kick due to misalignment. The emittance of a high-brightness electron beam from a photoinjector is affected by the status of alignments due to deflection force by the accelerating field. The misaligned beam w...

A general model for the axial divergence aberration function has been developed for a conventional X-ray powder diffractometer equipped with either incidentbeam and/or diffracted-beam Soller slits. In this model, the axial divergence function is generated from the geometrical dimensions of the diffractometer system, which include the axial lengths of the X-ray source, sample and receiving slit ...

Like other third generation light sources, main contributions to the be am lifetime of the Pohang Light Source come from the beam-gas scattering and the Touschek effect. The beam-gas scattering lifetime is measured with extremely low stored current in the long train of bunches. By investigating the vertical gap dependence of the beam-gas scattering lifetime, it i possible to decompose the beam-...

BACKGROUND Men treated for clinically localized prostate cancer with either radical prostatectomy or external beam radiotherapy usually survive many years with the side effects of these treatments. We present treatment-specific quality-of-life outcomes for prostate cancer patients 5 years after initial diagnosis. METHODS The cohort consisted of men aged 55-74 years who were newly diagnosed wi...

In the E-157 experiment now being conducted at the Stanford Linear Accelerator Center, a 30 GeV electron beam of 2310 electrons in a 0.65-mm-long bunch is propagated through a 1.4-m-long lithium plasma of density up to 2310 e/cm. The initial beam density is greater than the plasma density, and the head of the bunch expels the plasma electrons leaving behind a uniform ion channel with transverse...