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Fully polarized nonlinear Breit-Wheeler pair production from a beam of seed photons is investigated in pulsed plane-wave backgrounds. The particle (electron and positron) spin photon polarization are comprehensively described with the theory density matrix. compact expressions for energy spectrum produced particles, depending on initial beam, derived discussed both linearly circularly laser num...

∗ Research supported by the U.S. Department of Energy. † [email protected] Abstract A new optics design for beam injection into the University of Maryland Electron Ring (UMER) is proposed for multi-turn operations. We review the previous method where two pulsed and physically overlapped Panofsky quadrupoles (one is centered on the injector and the other is centered on the ring) are employed. Th...

We report the design of a spectral modification system (SMS) for use with the proposed NEAL linac-pulse stretcher ring, cw electron beam facility. The SMS allows tailoring of the energy distribution of electrons in beams produced by a pulsed linac operating in the transient beam loading (TBL) regime. Modification of the energy distribution of electrons injected into the pulse stretcher ring wil...

Diffuse electron-beam ionized discharges break down into arc discharges under three different conditions: static (no discharge orE-beam), dynamic (discharge on) and pulsed (inductive) overvoltage at switch-off. Dynamic breakdown voltages are lower than static breakdown voltages but in normal operation the discharge "on" voltage is kept to a minimum. The maximum load voltage will only be present...

As part of the Dual Axis Radiographic Hydrodynamic Test Facility II (DARHT II) and Advanced Hydrotest Facility (AHF) programs, we have began investigation of the possible adverse effects of (1) backstreaming ion emission from the Bremsstrahlung converter target and (2) the interaction of the resultant plasma with the electron beam during subsequent pulses. These effects would primarily manifest...

Photon bunching in incoherent cathodoluminescence (CL) spectroscopy originates from the fact that a single high-energy electron can generate multiple photons when interacting with material, thus, revealing key properties of electron–matter excitation. Contrary to previous works based on Monte Carlo modeling, here we present fully analytical model describing amplitude and shape second order auto...

High-current pulsed electron-beam (PEB) treatment was applied as a surface finishing procedure for Ti–35Nb–7Zr–5Ta (TNZT) alloy produced by electron beam melting (EBM). According to the XRD results TNZT samples before and after PEB have shown mainly single body-centered cubic (bcc) ?-phase microstructures. The crystallite size, dislocation density, microstrain remain unchanged treatment. invest...

Transient high heat flux events like ELMs, vertical displacement events and disruptions can cause the thermal ablation of plasma facing material. Until now experimental work in this field had been carried out by exposing material specimens to heat loads by electron or laser beam or by tests in pulsed plasma accelerators. In the present work carbon specimens were directly exposed to intense plas...