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In X-ray Free Electron Lasers (FEL) the use of ultra-compressed beam bunches often results in a residual chirp left in the beam from the compression stages, which can be detrimental to the FEL performance. The problem is particularly acute in the next generation X-ray FELs which will be using seeding techniques and where the energy spread requirements are more stringent. Its been proposed to mitig ...

A major problem with nuclear fission reactors is the welding of components of dissimilar metals, where the filler is usually of an additional metal alloy that is not necessarily the same as the two parts to be joined. Welding of metals will often have a heat affected zone (HAZ) and a thermo- mechanically affected zone (TMAZ), which need to be post-weld heat treated to minimize precipitation or seg ...

A. Statement of the Problem The klystrons used to drive cryomodules at JLAB and other accelerator facilities are relatively inefficient and becoming obsolete, as the RF world has been progressively converting to solid state technology. The JLAB upgrade program requires a ~8 kW, 1497 MHz amplifier operating at 55-60% efficiency, and 8 kW CW power to replace the existing 340 klystrons. Capital and ...

RF Breakdown RFBD) is a serious limitation in the performance of high gradient >200 MV/m) accelerators operating in W-band frequency range ~100 GHz). In order to study this phenomena at such high frequency, a special detector is required. Conventional detection instruments and methods, such as Faraday Cups, that are used to detect RFBD at lower frequencies are not capable of distinguishing the RFB ...

To improve public security and prevent the diversion of radioactive material for Radiation Dispersion Devices (or so-called dirty bombs) DOE is planning to dramatically reduce the amount of radioactive material in use. Ir-192 is the most common isotope used for radiography and poses a higher risk of being diverted since it must constantly be replenished, and is found in small, portable devices tha ...

A major problem with nuclear fission reactors is the welding of components of dissimilar metals, where the filler is usually of an additional metal alloy that is not necessarily the same as the two parts to be joined. Welding of metals will often have a heat affected zone (HAZ) and a thermo- mechanically affected zone (TMAZ), which need to be post-weld heat treated to minimize precipitation or seg ...

Enrichment plants represent one of the most sensitive parts of the nuclear fuel cycle, yet safeguards at enrichment plants remain a challenge for DOE and the International Atomic Energy Agency (IAEA). One of the key instruments for safeguards at enrichment plants – the Cascade Header Enrichment Monitor – is being redesigned to reduce its weight, dimensions and installation time. However, the r ...

Gamma-ray sources are currently used in well logging for densitometry and lithology among other applications. These sources typically employ radioactive sources such as 137Cs, which presents a significant safety and proliferation hazard due to its long half life (30 years). Furthermore, these sources typically use cesium chloride, a water-soluble crystalline salt, which makes them particularly dan ...

Currently, the most promising types of radiotherapy is proton or carbon therapy, as they have demonstrated significant improvements in clinical efficiency and reduced toxicity profiles. Unfortunately, the high cost of treatments using both proton and carbon beams is the limiting factor preventing hadron therapy from becoming the standard of care for a wider range of cancers. Designing a linear acc ...

High-brightness electron beams are required for a number of applications, from advanced accelerators to 4th generation light sources. Noticeable interest resides in the development of high in-pulse average current (0.5 - 1 A) and emittance below 10 mm-mrad, high brightness electron beams for both accelerator and light source applications, such as synchrotrons and THz emitters. The current technolo ...