Betatron Radiation from Underdense Plasma
Prof CP Welsch
Dr JR Lopez
No more applications being accepted
Funded PhD Project (Students Worldwide)
Plasma accelerators provide unique opportunities for the generation of high quality, short-pulse electrons beams which are an ideal basis for high quality radiation generation.
To commission a new type of very high brightness betatron radiation source, you will first study a single 10 GeV beam generated in a plasma wakefield accelerator, as a ‘typical’ drive beam. This simple setup will provide “clean”, relatively simple physics that can be compared to simulations and models and used to calibrate all devices and detectors.
Following single-bunch commissioning, you will then use two 10 GeV bunches (drive and witness) in a typical plasma wakefield accelerator configuration with accelerating fields of ~10 GeV/m, followed by the wakeless plasma source. Comparing the two, we expect to see a less broad radiation spectrum from the witness bunch in the wakeless plasma, due to the constant beam energy (note: the drive beam loses energy in both cases). The plasma density will then be progressively lowered to observe the transition from high to low (~1) Ku, if possible.
Next, you will repeat the two-bunch procedure above, but using the 100 MeV, low emittance witness beam provided by the planned photo injector near the experimental area of the FACET-II beamline. This configuration would provide a strong low Ku signal at low X-ray energy for the bent crystal detector system.
Finally, you will attempt to generate and observe very high brightness X-ray betatron radiation from an ultra-bright, plasma-injected beam in a wakeless plasma. Progress in this part will depend also on progress in e.g. plasma injection programs, such as Trojan Horse, as well as plasma source development, which must provide a seamless transition from the plasma injection region (wide plasma column, high density) to the wakeless plasma region (narrow plasma column, possibly lower density).
Contact Prof Carsten P Welsch ([Email Address Removed]) for further information and informal discussions.
The project is jointly funded by University of Liverpool and UCLA for 4 years with PhD registration at University of Liverpool; you will spend years 1 and 4 of your PhD primarily in the UK and years 2 and 3 in the USA at UCLA. International students are eligible to apply; a full package of training and support will be provided by the Cockcroft Institute, you will take part in a vibrant accelerator research and education community of over 150 people. IELTS score of at least 6.5. Contributions to teaching/lab courses will be expected as part of the project.