HZB, Berlin, Germany
DESY Zeuthen, Zeuthen, Germany
The Helmholtz-Zentrum Berlin is constructing the Energy Recovery Linac Prototype BERLinPro, a SRF based demonstration facility for the science and technology of ERLs for future high power, high brilliance electron beam applications. BERLinPro was designed to accelerate a high current (100 mA, 50 MeV), high brilliance (norm. emittance below 1 mm mrad) cw electron beam. Given the recent prioritization of the BESSY II upgrade to the BESSY VSR variable pulse length storage ring, HZB is forced to reduce the project goals of BERLinPro. As a result, the project had to be rescoped with the goal to maximize its scientific impact within the present boundary conditions. We report on the last year’s progress of the building, the warm and cold infrastructure and on the time line, goals nd opportunities for the remaining project run time.
THCOZBS02
HZB, Berlin, Germany
HU Berlin, Berlin, Germany
Helmholtz-Zentrum Berlin (HZB) is on the final round to complete an high average current superconducting (SC) ERL as a prototype to demonstrate low normalized beam emittance of 1 mm·mrad at 100mA and short pulses of about 2 ps. The high brilliance beam will originate from an 1.4 x λ/2 cell SRF cavity with a normal-conducting, high quantum efficiency CsK2Sb cathode, implementing a modified HZDR-style cathode insert. This prototype injector potentially allows for 6 mA beam current and up to 3.5 MeV beam kinetic energy, limited by the modified twin TTF-III fundamental power couplers. In this contribution the operation of the SRF injector cavity with a Copper cathode within a dedicated beam test experiment called Gunlab will be presented. The second half of the talk will give an overview about on-going activities to refurbish and reinstall the SRF gun module in the accelerator hall in BERLinPro. Also an insight into the repair attempts of the first cavity suffering from field emission will be given.