Experimental investigation of plasma impedance in Linac4 H- source

K. Nishida, S. Mattei, S. Briefi, A. Butterworth, A. Grudiev, M. Haase, A. Jones, M. M. Paoluzzi, G. Voulgarakis, Akiyoshi Hatayama, J. Lettry

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

CERN 's new particle accelerator Linac4 is part of the upgrade of the LHC accelerator chain. Linac4 is required to deliver 160 MeV H- beam to improve the beam brightness and luminosity in the Large Hadron Collider (LHC). The Linac4 H- source must deliver 40-50 mA, 45 keV H- beam in the RFQ acceptance. Since the RF power coupled to the H- source plasma is one of the important parameters that determines the quality of the H- beam, the experimental investigation of the dependence of the load impedance on the operational parameters is mandatory. In this study, we have measured the impedance of the H- source plasma varying the RF power coupled to the plasma and the condition of the hydrogen gas. Also, optical emission spectroscopy (OES) measurements have been carried out simultaneously with the impedance measurement in order to determine the plasma parameters. The determination of the plasma parameters allows us to compare the experimental results with the analytic model of the plasma parameters, which is useful to discuss the results from a physical point of view.

Original languageEnglish
Title of host publication5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
PublisherAmerican Institute of Physics Inc.
Volume1869
ISBN (Electronic)9780735415492
DOIs
Publication statusPublished - 2017 Aug 9
Event5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 - Oxford, United Kingdom
Duration: 2016 Sep 122016 Sep 16

Other

Other5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
CountryUnited Kingdom
CityOxford
Period16/9/1216/9/16

Fingerprint

impedance
particle accelerators
impedance measurement
optical emission spectroscopy
acceptability
brightness
accelerators
luminosity
hydrogen
gases

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nishida, K., Mattei, S., Briefi, S., Butterworth, A., Grudiev, A., Haase, M., ... Lettry, J. (2017). Experimental investigation of plasma impedance in Linac4 H- source. In 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 (Vol. 1869). [030038] American Institute of Physics Inc.. https://doi.org/10.1063/1.4995758

Experimental investigation of plasma impedance in Linac4 H- source. / Nishida, K.; Mattei, S.; Briefi, S.; Butterworth, A.; Grudiev, A.; Haase, M.; Jones, A.; Paoluzzi, M. M.; Voulgarakis, G.; Hatayama, Akiyoshi; Lettry, J.

5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016. Vol. 1869 American Institute of Physics Inc., 2017. 030038.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nishida, K, Mattei, S, Briefi, S, Butterworth, A, Grudiev, A, Haase, M, Jones, A, Paoluzzi, MM, Voulgarakis, G, Hatayama, A & Lettry, J 2017, Experimental investigation of plasma impedance in Linac4 H- source. in 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016. vol. 1869, 030038, American Institute of Physics Inc., 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016, Oxford, United Kingdom, 16/9/12. https://doi.org/10.1063/1.4995758
Nishida K, Mattei S, Briefi S, Butterworth A, Grudiev A, Haase M et al. Experimental investigation of plasma impedance in Linac4 H- source. In 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016. Vol. 1869. American Institute of Physics Inc. 2017. 030038 https://doi.org/10.1063/1.4995758
Nishida, K. ; Mattei, S. ; Briefi, S. ; Butterworth, A. ; Grudiev, A. ; Haase, M. ; Jones, A. ; Paoluzzi, M. M. ; Voulgarakis, G. ; Hatayama, Akiyoshi ; Lettry, J. / Experimental investigation of plasma impedance in Linac4 H- source. 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016. Vol. 1869 American Institute of Physics Inc., 2017.
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AU - Jones, A.

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AB - CERN 's new particle accelerator Linac4 is part of the upgrade of the LHC accelerator chain. Linac4 is required to deliver 160 MeV H- beam to improve the beam brightness and luminosity in the Large Hadron Collider (LHC). The Linac4 H- source must deliver 40-50 mA, 45 keV H- beam in the RFQ acceptance. Since the RF power coupled to the H- source plasma is one of the important parameters that determines the quality of the H- beam, the experimental investigation of the dependence of the load impedance on the operational parameters is mandatory. In this study, we have measured the impedance of the H- source plasma varying the RF power coupled to the plasma and the condition of the hydrogen gas. Also, optical emission spectroscopy (OES) measurements have been carried out simultaneously with the impedance measurement in order to determine the plasma parameters. The determination of the plasma parameters allows us to compare the experimental results with the analytic model of the plasma parameters, which is useful to discuss the results from a physical point of view.

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