Cooled beam diagnostics

The specific diagnostics systems used in cooler rings will be reviewed. The hardware used and the ways in which the physical characteristics of the beam are accessed will be described. It will be also shown how to evaluate the forces that are exerted on the beam during cooling

Ion Accumulation for LHC

The overall modifications of the PS complex (Linac3, LEIR, PS) to produce the LHC ion beams is described. While the main emphasis is put on lead, some considerations will be given to other ion species, which are or may be requested. The different systems are reviewed with particular attention to electron cooling, the injection systems and beam lifetime

LEAR performances

This report retraces the performances of LEAR during its life, the contribution to accelerator physics made at LEAR. It shows also the successful tests on ion accumulation that promises a new life of LEAR

Study of beam envelope oscillations by measuring the beam transfer function with quadrupolar pick-up and kicker

A quadrupolar pick-up provides information on beam envelope oscillations. To enhance the signals we have used a quadrupolar kicker to excite these modes. In this way the incoherent Laslett tune shift can be directly measured. The tune shifts and spreads of a dense proton beam obtained at LEAR with electron cooling have been studied varying parameters like the number of particles and the cooling time constant. The effects of stop-band on beam distribution as well as on instabilities have been studied. The technique and the results of these measurements will be discussed

Triumph Through Tragedy, One Student at at Time

The EF-4 tornado that struck Mayfield, Kentucky on the evening of December 10, 2021 caused tremendous destruction to the entire community of Mayfield. Two education professors at a neighboring university sought to help students in the Mayfield Independent School District and were able to do so via funding from a KEEP mini-grant. 81 of their college students were trained in Response to Intervention (RtI) practices and provided individual and small group instruction to students in Mayfield for 2 hours a week for 17 weeks during the 2022-2023 school year. Altogether, struggling students in Mayfield received 1,377 hours of RtI instruction from college students to help them recover academically in the aftermath of a horrific tornado

Conflict-Affected Youth Livelihoods Programming: Bridging The Gap Between Research & Practice

The current thesis project consists of a programmatic mapping of existing policy and programming related to conflict-affected youth livelihoods and a Rapid Evidence Assessment (REA) of the literature to identify the evidence base for effective interventions. The programmatic mapping identified key actors in the field and existing policy and programming, revealing a need for: data regarding evidence-based interventions; demand-driven intervention strategies; cross-sectoral partnerships providing holistic programming approaches; increased outreach to vulnerable sub-populations; and increased youth participation in program design, implementation, management, and evaluation. The REA revealed a severe shortage of evidence-based practice in this area, but sheds light on the value of cash grants for startup businesses, on-the-job training, demand-side market-driven programs, and combination strategies for increased employment. The joint findings diagnose a nonfunctioning system in which agencies continue to invest in youth livelihoods in conflict settings despite lacking data about effective interventions. The thesis concludes with a set of recommendations for researchers, policymakers, and practitioners to increase accountability in the provision of humanitarian and development assistance for youth livelihoods in conflict to improve youth development outcomes (including health)

Transverse Electron Cooling from the Time Evolution of the Profiles to Drift Velocities of the Oscillation Amplitudes

When a beam in a synchrotron is subjected to transverse cooling, the betatron oscillation amplitudes of the individual particles are reduced. A method to establish the velocity of the amplitude reduction as a function of the amplitude itself has been developed. The beam profile can be measured along the cooling process with for example beam ionisation monitors. From successive profiles one computes the time evolution of the amplitude distribution, which in turn allows the determination of the amplitude reduction velocity. This method could be applied to investigate the influence of the transverse electron temperature on electron cooling performance

New Methods to Create Hollow Bunches

New methods to create hollow distributions in longitudinal phase space based on manipulations with a double harmonic RF system at high energy are presented with application to the PS Booster synchrotron (PSB). Whereas the first tenatative to create hollow bunches at the PSB aimed to improve the performance of the PSB itself, these new methods are expected to reduce the limitations due to direct space charge forces in the receiving PS (where no double harmonic RF system is available) after transfer. One method aims to introduce empty phase space in the centre of the phase space by recombination of the beam in one bucket with another empty bucket. The second method is based on redistribution of phase space surfaces during the transfer of the beam from one second harmonic sub-bucket to another. During that process, phase space surfaces are exchanged and low density from the periphery ends up in the centre, whereas the high density surfaces from the centre are transferred to the periphery. Both methods have been simulated by particle tracking. The second method has been applied in practice at the PSB. The set-up turned out to be simple and fast, and to yield hollow distributions with good reproducibility