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; A. Hatayama; J. Lettry

doi:10.1063/1.4995758

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, A. Hatayama, J. Lettry

Department of Applied Physics and Physico-Informatics

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
Editors	Dan Faircloth
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735415492
DOIs	https://doi.org/10.1063/1.4995758
Publication status	Published - 2017 Aug 9
Event	5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 - Oxford, United Kingdom Duration: 2016 Sep 12 → 2016 Sep 16

Publication series

Name	AIP Conference Proceedings
Volume	1869
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
Country	United Kingdom
City	Oxford
Period	16/9/12 → 16/9/16

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.4995758

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Nishida, K., Mattei, S., Briefi, S., Butterworth, A., Grudiev, A., Haase, M., Jones, A., Paoluzzi, M. M., Voulgarakis, G., Hatayama, A., & Lettry, J. (2017). Experimental investigation of plasma impedance in Linac4 H^- source. In D. Faircloth (Ed.), 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 [030038] (AIP Conference Proceedings; Vol. 1869). 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, A.; Lettry, J.

5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016. ed. / Dan Faircloth. American Institute of Physics Inc., 2017. 030038 (AIP Conference Proceedings; Vol. 1869).

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 D Faircloth (ed.), 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016., 030038, AIP Conference Proceedings, vol. 1869, 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. ; Jones, A. ; Paoluzzi, M. M. ; Voulgarakis, G. ; Hatayama, A. ; Lettry, J. / Experimental investigation of plasma impedance in Linac4 H^- source. 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016. editor / Dan Faircloth. American Institute of Physics Inc., 2017. (AIP Conference Proceedings).

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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.",

author = "K. Nishida and S. Mattei and S. Briefi and A. Butterworth and A. Grudiev and M. Haase and A. Jones and Paoluzzi, {M. M.} and G. Voulgarakis and A. Hatayama and J. Lettry",

note = "Funding Information: This work is supported in part by the Program for Leading Graduate Schools,“Global Environmental System Leaders Program ”by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan.; 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 ; Conference date: 12-09-2016 Through 16-09-2016",

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AU - Nishida, K.

AU - Mattei, S.

AU - Briefi, S.

AU - Butterworth, A.

AU - Grudiev, A.

AU - Haase, M.

AU - Jones, A.

AU - Paoluzzi, M. M.

AU - Voulgarakis, G.

AU - Hatayama, A.

AU - Lettry, J.

N1 - Funding Information: This work is supported in part by the Program for Leading Graduate Schools,“Global Environmental System Leaders Program ”by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan.

PY - 2017/8/9

Y1 - 2017/8/9

N2 - 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.

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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