56413579
A superconducting short period undulator for a harmonic generation FEL experiment
A three stage superconducting (SC) undulator for a high gain harmonic generation (HGE) FEL experiment in the infrared is under construction at the NSLS in collaboration with Grumman Corporation. A novel undulator technology suitable for short period (6-40 mm) undulators will be employed for all three stages, the modulator, the dispersive section and the radiator. The undulator triples the frequency of a 10.4 /spl mu/m CO/sub 2/ seed laser. So far a 27 period (one third of the final radiator) prototype radiator has been designed, built and tested.<<ETX>>
118755074
Design and construction of a Compact Infrared Free Electron Laser CIRFEL
The 5-15 micron Grumman Compact Infra Red Free Electron Laser CIRFEL which will produce extremely short pulses of tunable radiation under construction is described. Electron pulses are produced at a repetition rate of up to 10 Hz by the illumination of a single crystal <001> LaB/sub 6/ photocathode with a photon injector, a 6-10 psec, 349 nm (frequency tripled Nd-YLF) laser mode locked to the 20th subharmonic of 2856 MHz. Photoelectrons are further accelerated and guided to the superconducting microwiggler by a robust beam transport system through an achromatic bend. The /spl sim/10 MeV electrons interact with the optical radiation inside a near symmetric laser cavity. The FEL output will be coupled out through a hole in one of the cavity mirrors. The CIRFEL system is expected to be delivered in 1994.<<ETX>>
120331510
Neutral and radiative decay modes of the new resonances
Preliminary results are presented for decays of the new resonances J/ψ and ψ' into final states containing photons. Neutral final states at √s = 3.1 GeV are discussed. There are arguments that the spin of the Pc state at 3.5 GeV is different from 0. Final states π+π-γγ at 3.1 GeV are analysed on a statistical basis.
196147152
Experience With the Jade Jet - Chamber at {PETRA} and Pattern Recognition Programs for the Jade Jet - Chamber
17115362
An outlook from Europe
The global spread of the Coronavirus Disease 2019 (COVID-19) created a significant amount of market volatility and caused a steep sell-off in equity markets in March. While the situation remains incredibly fluid, and the full impact of the pandemic on companies’ valuations and earnings is not yet fully known, we believe companies that are able to weather this event-driven shock offer an extremely rare opportunity to invest in attractive businesses at historically low valuations. Companies with strong balance sheets, healthy margins, established and sustainable cash flows, and lower financial leverage should be better positioned relative to peers during and after this global health emergency.