IPAC'23 - Student Poster Session Guide

IPAC’23 / STUDENT POSTER SESSION GUIDE 49 Student Poster Session SUPM092 Simulation Studies on an XUV High-Gain FEL Oscillator at FLASH Margarit Asatrian , Velizar Miltchev, Wolfgang Hillert (University of Hamburg), Georgia Paraskaki (Deutsches Elektronen-Synchrotron). Externally seeded high-gain free electron lasers (FELs) are capable of providing fully coherent radiation with high shot-to-shot stability, achieving these qualities at wavelengths down to the soft X-Ray range (with the use of harmonic conversion schemes). However, at the moment, seed laser sources suitable for the generation of short-wavelength FEL radiation are not available at high repetition rates. As a result, such setups have been un- able to make use of the full repetition rate of superconducting machines. Cavity-based FELs have been proposed as one possible way to overcome these limitations, allowing to combine short wavelengths and high repetition rates, while preserving the full co- herence. We present simulation studies for such a high-gain FEL oscillator planned for FLASH, which is aimed at the generation of fully coherent radiation at the wavelength of 13.5 nm and the repe- tition rate of 3 MHz. Achieving bunching on that wavelength would make it possible to generate fully coherent radiation at much shorter wavelengths with the use of harmonic conversion schemes. SUPM093 Status Of Plasma Diagnostics On The Prototype Plasma Lens For Optical Matching At The ILC e+ Source Niclas Hamann (University of Hamburg) . Manuel Formela (University of Hamburg), Gregor Loisch, Gudrid Moortgat-Pick, Jens Osterhoff, Kai Ludwig (Deutsches Elektronen-Synchrotron). In recent years, high-gradient, symmetric focusing with active plasma lenses has regained sig- nificant interest due to its potential advantages in compactness and beam dynamics compared to conventional focusing elements. A promising application could be optical matching of highly divergent positrons from the undulator-based ILC positron source into the downstream accel- erating structures to increase the positron yield. In a collaboration between University Hamburg and DESY Hamburg a downscaled prototype for this application has been developed. Here, we present first plasma diagnostics results, such as discharge current stability, electron density distribution and reproducibility. Additionally, fu- ture plans for measuring the magnetic field distribution and a possible fullscale prototype will be discussed.