Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
| Autor: | G. Sattonnay, C. Bruni, V. Baglin, B. Mercier, S. Bilgen |
|---|---|
| Přispěvatelé: | Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
electron
History Materials science Proton Physics::Instrumentation and Detectors electron: yield [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] vacuum copper: electrode 02 engineering and technology Electron 01 natural sciences 7. Clean energy Secondary electrons Education Ion pressure Ionization 0103 physical sciences gas: ionization 010302 applied physics experiment electron: cloud Ion current electron: secondary p: beam 021001 nanoscience & nanotechnology Accelerators and Storage Rings vacuum system Computer Science Applications ECR CERN LHC Coll Vacuum chamber Atomic physics 0210 nano-technology Beam (structure) proton |
| Zdroj: | J.Phys.Conf.Ser. |
| DOI: | 10.18429/JACoW-IPAC2019-TUPMP004⟩ |
| Popis: | Ultra-High Vacuum is an essential requirement to reach design performances in high-energy particle colliders. For the future HL-LHC or FCC study, the understanding of the beam interactions with the vacuum chamber is fundamental to provide solutions to mitigate the pressure rises induced by electronic, photonic and ionic molecular desorption. Studies were performed on the ions, produced by molecular ionization generated by the proton beam and the electron cloud, and stimulating molecular desorption by the surface bombardment. In-situ measurements were carried out, on the LHC Vacuum Pilot Sector (VPS)*, to monitor the dynamic pressure, and to collect the electrical signals due to the electron cloud and to the ions interacting with the vacuum chamber walls. Experimental measurements of electrical signals recorded by copper electrodes were compared to calculations taking into account both the Secondary Electron Yield of copper and electron energy distribution. Finally, it seems that copper electrodes were not fully conditioned and an ion current could be estimated. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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