We describe how spatially resolved velocity measurements can be acquired using a pulse-amplified single-mode cw laser with a potential of single-shot measurements. The laser beam was tuned to the point of maximum slope of a Doppler-broadened absorption profile of I(2), which was seeded into the flow. The beam was then split into two components and sent counterpropagating through the measurement...

A new approach is described for the combination of electron ionization and LC–MS based on sample ionization as vibrationally cold molecules in a supersonic molecular beam (Cold EI). Cold EI of sample compounds in liquid solutions (methanol, acetonitrile, water, etc.) is achieved through spray formation, followed by soft thermal vaporization of the sample particles prior to their supersonic expa...

Coherent synchrotron radiation from the NSLS VUV ring has been detected and partially characterized. The observations have been performed at the new far infrared beamline U12IR. The coherent radiation is peaked near a wavelength of 7mm and occurs in short duration bursts. The bursts occur only when the electron beam current (I) exceeds a threshold value (Ith), which itself varies with ring oper...

For future linear colliders, with very small emittances and beam sizes and demanding tolerances on final focus system alignment and magnet errors, it becomes incress-ingly important to use the beam as a diagnostic tool. We report here procedures we have identified and will be implemented in the Final Focus Test Beam at SLAC incorporating i) quadrupole strength changes, ii) central orbit modific...

We are developing Laser Super Cavity for compact X-ray generator based on Inverse Compton Scattering with several tens MeV electron beam. The laser supercavity increases the laser power and makes small laser beam size at the collision point with the electron beam. A FabryPerot cavity as the laser supercavity has been tested at the KEK-ATF (Accelerator Test Facility) and the design for the incre...

For the system formed by a relativistic electron beam and its plasma return current, we investigate the effects of both transverse and parallel beam and plasma temperatures on the linear stability of collective electromagnetic modes. We focus on nonrelativistic temperatures and wave-vector orientations ranging from two-stream to filamentation instabilities. Water-bag distributions are used to m...

The application fields of intense gamma-ray or X-ray for industrial purpose are expanding. Electron beam accelerator which can generate X-ray whose dose rate is equivalent to the effect of several MCi gamma-ray source is a major candidate as a intense X-ray source. 10 MeV, 100 kW CW electron accelerator Fantron-I is conceptually designed for X-ray source to irradiate food, corn, forest products...

We present PARSEC, a 3D parallel self-consistent particle tracking program which allows electron-cloud calculations in arbitrary external fields. The program is based on an general particle tracking framework called GenTrackE [5]. The Lorentz force equation is integrated with time as the independent variable. A 3D parallel Multigrid solver computes the electric field for the drive beam in the b...

Nomenclature L y spanwise coordinate q net beam loading S shear M bending moment θ deflection angle (= dw/dx) w deflection κ local beam curvature ′ lift/span distribution ′ S η normalized spanwise coordinate (= 2y/b) c local wing chord wing wing area b wing span λ taper ratio E Young's modulus δ tip deflection N load factor m wing mass/span distribution I bending inertia i spanwise station inde...

Reported are interactions of high-intensity laser pulses ( lambda = 810 nm and I</=3x10(18) W/cm(2)) with plasmas in a new parameter regime, in which the pulse duration ( tau = 29 fs) corresponds to 0. 6-2.6 plasma periods. Relativistic filamentation is observed to cause laser-beam breakup and scattering of the beam out of the vacuum propagation angle. A beam of megaelectronvolt electrons with ...