A solenoid retarding spectrometer with high resolution and transmission for keV electrons

Erratum to: “Development of a Super-Stable Datum Point for Monitoring the Energy Scale of Electron Spectrometers in the Energy Range up to 20 keV” by D. Vénos, M. Zbořil, J. Kašpar, O. Dragoun, J. Bonn, A. Kovalík, O. Lebeda, N. A. Lebedev, M. Ryšavý, K. Schlösser, A. Špalek, and Ch. Weinheimer, Vol. 53, No. 3, pp. 305–312, July, 2010

“…In order to compensate for the reduction in the intensity of source No. 28 as a result of radioactive decay of the 83 Rb, the electron source and detector of the spectrometer were shifted in opposition to one another, i.e., closer to the corresponding magnets providing the magnetic field of the spectrometer [23]. After this, the intensity of the K-32 line recorded by the detector doubled, and its measured energy decreased by 0.36 eV (see the 72-75 day period in Fig.…”

“…The natural width of such a peak is determined by the natural widths of the corresponding atomic level and nuclear transition. In our investigations, we employed two different types of electron spectrometers: the differential electrostatic ESA12 [21,22] of the cylindrical-mirror type with second-order focusing, supplied with a retarding (accelerating) lens and a channel multiplier as an electron detector (Institute of Nuclear Physics, Academy of Sciences of the Czech Republic, Ř ež near Prague), and an integral spectrometer [23] with the magnetic adiabatic collimator with an electrostatic filter type -the MAC-E-Filter (Institute of Physics, University of Mainz, Germany). The first of the spectrometers operates in the 0-20 keV range with a relative instrument resolution ΔE/E= 0.011 in the "basic" mode and with an absolute resolution ΔE = 1 and 3 eV for electron energies of 2 keV and 7 keV, respectively, in the electron retardation mode (reduced transmission).…”

A pulsed, mono-energetic and angular-selective UV photo-electron source for the commissioning of the KATRIN experiment

“…The principal design of the MAC-E filter is based on the combination of an electric retarding potential with a spatially inhomogeneous magnetic field [10]. In the following we describe this principle on the basis of the technical implementation at the KATRIN experiment.…”

“…The fit results in a work function of = 3.78 eV ± 0.03 eV(sys) ± 0.01 eV(stat) for the gold photocathode 10 Measured work function of the photocathode. The work function is determined from the measured electron yield w. r. t. to the UV wavelength, a method proposed by Fowler [25].…”

“…The electrons then enter the transport and pumping section that reduces the tritium flow by a factor of 10 14 in total [7], using a combination of a differential pumping section (DPS [8]) with turbo-molecular pumps and a cryogenic pumping section (CPS [9]) where tritium is adsorbed by an argon frost layer. The kinetic energy of the decay electrons is analyzed in a tandem of MAC-E filter 1 spectrometers [10][11][12]. The main spectrometer achieves an energy resolution of 0.93 eV at the tritium endpoint of E 0 (T 2 ) = 18,571.8 (12)eV [5,13] by a combination of an electrostatic retarding potential and a magnetic guiding field.…”