Optimal operation of a 4-element injection lens in a hemispherical spectrograph: FDM/BEM simulation and experimental demonstration

29th International Conference on Photonic, Electronic, and Atomic Collisions

Martinez, G.^1 ; Madesis, I.^2,3 ; Dimitriou, A.^2,3 ; Laoutaris, A.^4 ; Sise, O.^5 ; Zouros, T.J.M.^2,3

Dept. Fisica Aplicada III, Facultad de Fisica, UCM, Madrid

28040, Spain^1

Dept. of Physics, Univ. of Crete, P.O Box 2208, Heraklion

GR 71003, Greece^2

Tandem Accelerator Laboratory, INPP, NCSR Demokritos, Ag Paraskevi

GR 15310, Greece^3

Dept. of Applied Physics, National Technical University of Athens, Athens

GR 15780, Greece^4

Dept. of Science Education, Faculty of Education, Suleyman Demirel University, Isparta

32260, Turkey^5

关键词: Electrode voltage;    Energy resolutions;    Experimental demonstrations;    Free parameters;    Optimal operation;    Retardation factors;    Tandem accelerators;    Voltage settings;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/5/052083/pdf
DOI  :  10.1088/1742-6596/635/5/052083

来源: IOP

【 摘 要 】

We have investigated the voltage settings for the 4-element injection lens of a biased paracentric hemispherical deflection analyzer (HDA) with virtual entry aperture using numerical methods. The two lens electrode voltages were varied as free parameters while the electron optical properties of the analyzer were calculated from trajectories with test initial distributions for different pre-retardation factors in an effort to obtain improved energy resolution. The resulting lens voltages were then also tested on the existing HDA spectrometer at the Tandem Accelerator Laboratory, while simulated and measured line profile characteristics were compared, particularly at the best resolution working points.