1. PhD Topics at Novel Accelerator Group of Manchester Guoxing Xia 27 th June 2016

2. Cutting-edge research Plasma wakefield acceleration PWFA Beam driven dielectric accelerator DWA Proton driven plasma wakefield acceleration and AWAKE at CERN Novel coatings for reducing SEY for next generation particle accelerators Compact radiation sources (x-rays, gamma rays) based on laser-plasma interactions

3. What is high impact? Ultrahigh accelerating gradient Overcome transformer ratio (TR) limit Realistic beam distribution in S2E simulation Beam loading effect (position, charge, intensity…) Plasma lens (strong focusing for BDS) Betatron radiation (source) and its impact to beam quality Multi bunch driven PWFA for high TR Using plasma to dump the collider beams (passive and compact beam dump design) …

4. What is high impact? Demonstration of a better THz source via DWA and its diagnostics Novel structures such as Bragg structures, multi- dielectric arrays/layers with different refractive indices, slant structures Test of other materials, e.g. diamond, fused silica, compounds, artificial materials? Energy dechirping for FELs Deceleration/acceleration study Overcome transformer ratio limit? …

5. What is high impact? The mechanism of secondary electron emission (energy levels in materials/surfaces) Graphene coated surfaces and the SEY reduction, why SEY can be reduced in graphene (papers in ACSNano and other journals)? Electron distribution in graphene and graphite, differences? SEY and its dependence on surface roughness The different methods to suppress SEY, vacuum conditioning (photons/other beams), backing, coatings, grooved surfaces (surface roughness), laser-engineering surfaces, basic mechanism SEY measurement in various magnetic environment (dipole, quadrupole, sextupole, etc.) SEY measurement in cryogenic environment? Physics for diagnostics (XPS, Raman, SEM etc. focused on two of them) …

6. What is high impact? Hollow-plasma channel, near-hollow plasma channel for e- and e+ acceleration Dual beam acceleration based on PDPWA Collider design issues based on plasma acceleration Radiation effect in PWFA based colliders Plasma and beam jitters and their impact to AWAKE experiment Matching of two plasma stages and simulation …

7. How to get your PhD degree? In depth understanding of physics behind the phenomena (simulation/experiment results) History (background knowledge), problems nowadays (motivations), solutions (physics understanding, theoretical+ numerical study), experimental results, discussion, outlook and implications to the future Physics is the key for a PhD in Physics

8. Work progress Detailed plan for the projects Biweekly group meetings Monthly reports Training at CI and University eProg update in time Keep in touch with me from time to time

9. PhD and PhD thesis