Production of the 1.5 GHz fundamental power couplers for VSR demo

Research Instruments RI and Thales have been pro ducing the first two prototype 1.5 GHz fundamental power couplers for the VSR Variable pulse length Storage Ring DEMO since early 2021 and delivered these prototypes in late March 2023. These couplers are designed to provide up to 16 kW CW power to two 1.5 GHz superconducting cavities of the VSR DEMO module and provide variable coupling with a Qext range from 6 106 to 6 107. The paper describes the challenges in fabricating a scaled coupler and provides details on the modifications to the design as a re sult of these challenges. The impact of the late stage design modification is discussed along with how this affects future conditioning plan

Final Design Studies for the VSR DEMO 1.5 GHz Coupler

With the 1.5 GHz couplers for VSR DEMO are now in the manufacturing stages, the studies that led to the final coupler design will be presented. The system specific constraints and design modifications that combat the challenges of; thermomechanical stresses, HOM propagation and dimensional constraints are explored. This includes S Parameter analysis, an in depth study of the coupling factor, and multipacting studies for the average 1.5 kW and peak 16 kW powe

Understanding and Overcoming Roadblocks to Environmental Sustainability : Past Roads and Future Prospects

This working paper examines key barriers to business sustainability discussed at a multidisciplinary conference held at the Harvard Business School in 2018. Drawing on perspectives from both the historical and business literatures, speakers debated the historical success and future opportunities for voluntary business actions to advance sustainability. Roadblocks include misaligned incentives, missing institutions, inertia of economic systems, and the concept of sustainability itself. It appears that overcoming these roadblocks will require systematic interventions and alternative normative concepts

No evidence for interstitial lung oedema by extensive pulmonary function testing at 4,559 m.

The aim of the present study was to better understand previously reported changes in lung function at high altitude. Comprehensive pulmonary function testing utilising body plethysmography and assessment of changes in closing volume were carried out at sea level and repeatedly over 2 days at high altitude (4,559 m) in 34 mountaineers. In subjects without high-altitude pulmonary oedema (HAPE), there was no significant difference in total lung capacity, forced vital capacity, closing volume and lung compliance between low and high altitude, whereas lung diffusing capacity for carbon monoxide increased at high altitude. Bronchoconstriction at high altitude could be excluded as the cause of changes in closing volume because there was no difference in airway resistance and bronchodilator responsiveness to salbutamol. There were no significant differences in these parameters between mountaineers with and without acute mountain sickness. Mild alveolar oedema on radiographs in HAPE was associated only with minor decreases in forced vital capacity, diffusing capacity and lung compliance and minor increases in closing volume. Comprehensive lung function testing provided no evidence of interstitial pulmonary oedema in mountaineers without HAPE during the first 2 days at 4,559 m. Data obtained in mountaineers with early mild HAPE suggest that these methods may not be sensitive enough for the detection of interstitial pulmonary fluid accumulation.Journal ArticleSCOPUS: ar.jinfo:eu-repo/semantics/publishe