Abstract
The U-120M cyclotron at the Nuclear Physics Institute (NPI) of the Czech Academy of Sciences in Rez is used for radiation hardness tests of electronics for high-energy physics experiments. These tests are usually carried out with proton fluxes of the order of 10<sup>5</sup>–10<sup>9</sup> proton·cm<sup>−2</sup>·s<sup>−1</sup>. Some tests done for the upgrade of the Inner Tracking System of the ALICE experiment at CERN, however, required proton beam intensities several orders of magnitude lower. This paper presents a method which has been developed to achieve the proton beam flux of the order of 1 proton · cm<sup>−2</sup>·s<sup>−1</sup>. The method is mainly based on reduction of the discharge current in the cyclotron internal Penning type ion source. Influence of this new operation mode on the lifetime of ion source cathodes is discussed.
Highlights
The Nuclear Physics Institute (NPI) cyclotron U-120M [1] is a four-sector isochronous cyclotron which was developed in the Joint Institute of Nuclear Research in Dubna (Russia) and installed in the NPI in 1977
The continuous upgrade of all machine technology systems allowed to reach high reliability and very good reproducibility of the beam parameters between different irradiation campaigns. This is especially important for our cooperation on the radiation hardness tests of electronics for the upgrade of the Inner Tracking System (ITS) detector of the ALICE experiment at CERN [3]
In the tests of radiation hardness done at the U-120M cyclotron facility, intensity of the proton beam is monitored 130 cm from the cyclotron negative mode beamline exit window using an ionization chamber Farmer 30010 from PTW-Freiburg [5]
Summary
The NPI cyclotron U-120M [1] is a four-sector isochronous cyclotron which was developed in the Joint Institute of Nuclear Research in Dubna (Russia) and installed in the NPI in 1977 Since it has been continuously upgraded [2]. The continuous upgrade of all machine technology systems allowed to reach high reliability and very good reproducibility of the beam parameters between different irradiation campaigns. This is especially important for our cooperation on the radiation hardness tests of electronics for the upgrade of the Inner Tracking System (ITS) detector of the ALICE experiment at CERN [3]. Together with a description of the corresponding beam and dose monitoring system can be found in [4]
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