Pulsed DC High Field Measurements of Irradiated and Non-Irradiated Electrodes of Different Materials
| Autor: | Peacock, Ruth, Bellodi, Giulia, Burt, Graeme, Calatroni, Sergio, Da Palma Serafim, Catarina, Grudiev, Alexej, Lombardi, Alessandra, Perez Fontenla, Ana Teresa, Ramberger, Suitbert, Sargsyan, Edgar, Sgobba, Stefano, Wuensch, Walter |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| DOI: | 10.18429/jacow-linac2022-tupopa13 |
| Popis: | Beam loss occurs in Radio Frequency Quadrupoles (RFQ), and has been observed in the H⁻ linear accelerator Linac4 (L4) at CERN. To determine if beam loss can induce breakdowns, and to compare the robustness of different materials, tests have been done using pulsed high-voltage DC systems. Electrical breakdown phenomena and conditioning processes have been studied using these systems. Cathodes of different materials were irradiated with 1.2x10¹⁹ H⁻ p/cm², the estimated beam loss of the L4 RFQ over 10 days. The irradiated electrodes were installed in a system to observe if the irradiated area coincided with the breakdown locations, with pulsing parameters similar to the RFQ. Tests of irradiated and non-irradiated electrodes of the same material were done for comparison. The main difference observed was an increase in the number of breakdowns during the initial conditioning that returned to non-irradiated sample values with further running. Visual observations after irradiation show the beam centre and a halo the same diameter of the beam pipe. Breakdown clusters occur in the centre and halo regions, suggesting irradiation is not the only factor determining the breakdown probability. Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK |
| Databáze: | OpenAIRE |
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