TY - GEN
T1 - Experimental investigation of plasma impedance in Linac4 H- source
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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U2 - 10.1063/1.4995758
DO - 10.1063/1.4995758
M3 - Conference contribution
AN - SCOPUS:85030126976
T3 - AIP Conference Proceedings
BT - 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
A2 - Faircloth, Dan
PB - American Institute of Physics Inc.
T2 - 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
Y2 - 12 September 2016 through 16 September 2016
ER -