Mainz 2017 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 4: New Methods and Technical Developments

MS 4.3: Talk

Tuesday, March 7, 2017, 15:15–15:30, RW 2

Design of a Beam Profile Monitor for measurements of the phase space — •Daniele De Maria, Hans-Arno Synal, Arnold Müller, and Sascha Maxeiner — Laboratory of Ion Beam Physics, ETH Zurich, Switzerland

In a typical AMS system, a beam of negative ions arises from the analyzed sample. The phase space of this beam, given by its width and divergence, is an interesting quantity, as it allows, for example, to optimize the beam transport through the system. To investigate the phase space generated by a MICADAS type ion source, a Beam Profile Monitor (BPM) based on two oscillating sensing wires located at two different positions along the beam axis has been developed. The versatile measurement board Red Pitaya implemented in the experimental set up has been programmed such that both the driving signal for the wires taking the intensity profile of the beam, as well as data acquisition of measured beam current are provided. Measurements of the behaviour of the phase space after the first dipole magnet were performed as a function of the beam’s energy in the range between 30 keV and 50 keV at the MyCadas facility at the Laboratory of Ion Beam Physics at ETH Zurich. The measurements allowed to identify the phase space in the horizontal plane and in the vertical plane, respectively. In the talk, the algorithms studied to calibrate the relative position of the BPM respect to a reference beam and to derive its width and divergence are presented. The results of the performed measurements are discussed too, as well as the sources of uncertainty and possible improvements.