Space charge studies for the CompactLight Project & Radiation Studies in the CHARM facility

PART I CompactLight is a project in which take part 24 institutes (21 European +3 extra Europeans), gathering the world-leading experts both in the domains of X-band acceleration and undulator design. More specifically, H2020 Com- pactLight Project aims at designing the next generation of compact hard X-Rays Free-Electron Lasers, relying on very high accelerating gradients and on novel undulator concepts. In the framework of that project I perfomed bench-marking of space charge forces between the RF-Track software against ASTRA. This included the implementations of analytical forms in Octave as well. PART II The CERN High energy AcceleRator Mixed field (CHARM) facility has been constructed in 2014 in the CERN East Experimental Area to study radia- tion effects on electronic components. It receives a primary proton beam from the CERN Proton Synchrotron at a beam momentum of 24GeV /c and a maximum average beam intensity of 6.7E10 protons/second with a max- imum pulse intensity of 5E11 protons/pulse and a respective pulse length of 350ms. The beam impinges on one out of a set of dedicated targets to produce the desired radiation fields at several experimental positions. The beam operation of the CHARM facility leads to activation of the facility it- self, including the targets, walls, floors and other support structures. The correct prediction of the residual ambient dose equivalent rates is impor- tant for the optimization of the design of such a facility as well as for the iplanning of accesses to the facility. The fact that the facility configuration during beam operation is different in the CHARM facility compared to the facility configuration during access, e.g. the irradiated targets are moved to a dedicated alcove that is closed during access, makes this prediction even more challenging for the CHARM facility. A dedicated residual ambient dose equivalent rate measurement campaign with several mobile devices as well as permanently installed devices has been performed at the end of the 2015 beam period in the CHARM facility starting from 1 hour after beam stop collecting data for 1 week. These data are compared to predictions for the residual ambient dose equivalent rates in the CHARM facility performed with the FLUKA Monte Carlo code, coupled to the DORIAN code for the various facility configurations, as a function of the cool-down time taking the operational parameters of the CHARM facility in 2015 into account. This includes the characteristics of the beam delivered to the CHARM facility as well as the CHARM target settings.