CERN's Linac4 H                         -                          sources: Status and operational results

J. Lettry; D. Aguglia; J. Alessi; P. Andersson; S. Bertolo; A. Butterworth; Y. Coutron; A. Dallocchio; N. David; E. Chaudet; D. Fink; J. Gil-Flores; M. Garlasche; A. Grudiev; R. Guida; J. Hansen; M. Haase; A. Hatayama; A. Jones; I. Koszar; T. Lehn; C. Machado; C. Mastrostefano; S. Mathot; S. Mattei; O. Midttun; P. Moyret; D. Nisbet; K. Nishida; M. O'Neil; M. Paoluzzi; J. Sanchez Alvarez; R. Scrivens; T. Shibata; D. Steyaert; N. Thaus; A. Zelenski

doi:10.1063/1.4916432

CERN's Linac4 H ^- sources: Status and operational results

J. Lettry, D. Aguglia, J. Alessi, P. Andersson, S. Bertolo, A. Butterworth, Y. Coutron, A. Dallocchio, N. David, E. Chaudet, D. Fink, J. Gil-Flores, M. Garlasche, A. Grudiev, R. Guida, J. Hansen, M. Haase, A. Hatayama, A. Jones, I. KoszarT. Lehn, C. Machado, C. Mastrostefano, S. Mathot, S. Mattei, O. Midttun, P. Moyret, D. Nisbet, K. Nishida, M. O'Neil, M. Paoluzzi, J. Sanchez Alvarez, R. Scrivens, T. Shibata, D. Steyaert, N. Thaus, A. Zelenski

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

19 Citations (Scopus)

Abstract

Two volume sources equipped with DESY and CERN plasma generators and a low voltage electron dump were operated at 45 kV in the Linac4 tunnel and on a dedicated test stand. These volume sources delivered approximately 20 mA and ensured the commissioning of the Radio Frequency Quadrupole accelerator and of the first section of the Drift Tube Linac. CERN's prototype of a cesiated surface source equipped with this electron dump was operated continuously from November 2013 to April 2014 on the ion source test stand and is being commissioned in the Linac4 tunnel. Before cesiation, the prototype conditioned in volume mode provided up to 30 mA H ^- beam. Short cesiations, of the order of 10 mg effectively reduced the intensity of co-extracted electrons down to 2 - 8 times the H ^- current; this cesiated surface operation mode delivered up to 60 mA H ^- beam. An H ^- beam of the order of 40 mA was sustained up to four weeks operation with 500 μs pulses at 1.2s spacing. A new extraction was designed to match these beam properties. A copy of BNL's magnetron produced at CERN was tested at BNL and delivered at 40 kV H ^- beam exceeding Linac4's nominal intensity of 80 mA. In this contribution, the performances, dynamic response to cesiation, stability and availability of these prototypes are described. The needed optimization of the emittance of H ^- beam above 40 mA is presented, which requires an evolution of the front end that encompasses implementation of a large ceramic insulator.

Original language	English
Title of host publication	4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014
Editors	Werner Kraus, Paul McNeely
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735412972
DOIs	https://doi.org/10.1063/1.4916432
Publication status	Published - 2015 Apr 8
Externally published	Yes
Event	4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014 - Garching, Germany Duration: 2014 Oct 6 → 2014 Oct 10

Publication series

Name	AIP Conference Proceedings
Volume	1655
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014
Country/Territory	Germany
City	Garching
Period	14/10/6 → 14/10/10

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.4916432

Cite this

Lettry, J., Aguglia, D., Alessi, J., Andersson, P., Bertolo, S., Butterworth, A., Coutron, Y., Dallocchio, A., David, N., Chaudet, E., Fink, D., Gil-Flores, J., Garlasche, M., Grudiev, A., Guida, R., Hansen, J., Haase, M., Hatayama, A., Jones, A., ... Zelenski, A. (2015). CERN's Linac4 H ^- sources: Status and operational results. In W. Kraus, & P. McNeely (Eds.), 4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014 Article 030005 (AIP Conference Proceedings; Vol. 1655). American Institute of Physics Inc.. https://doi.org/10.1063/1.4916432

CERN's Linac4 H ^- sources: Status and operational results. / Lettry, J.; Aguglia, D.; Alessi, J. et al.
4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014. ed. / Werner Kraus; Paul McNeely. American Institute of Physics Inc., 2015. 030005 (AIP Conference Proceedings; Vol. 1655).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Lettry, J, Aguglia, D, Alessi, J, Andersson, P, Bertolo, S, Butterworth, A, Coutron, Y, Dallocchio, A, David, N, Chaudet, E, Fink, D, Gil-Flores, J, Garlasche, M, Grudiev, A, Guida, R, Hansen, J, Haase, M, Hatayama, A, Jones, A, Koszar, I, Lehn, T, Machado, C, Mastrostefano, C, Mathot, S, Mattei, S, Midttun, O, Moyret, P, Nisbet, D, Nishida, K, O'Neil, M, Paoluzzi, M, Sanchez Alvarez, J, Scrivens, R, Shibata, T, Steyaert, D, Thaus, N & Zelenski, A 2015, CERN's Linac4 H ^- sources: Status and operational results. in W Kraus & P McNeely (eds), 4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014., 030005, AIP Conference Proceedings, vol. 1655, American Institute of Physics Inc., 4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014, Garching, Germany, 14/10/6. https://doi.org/10.1063/1.4916432

Lettry J, Aguglia D, Alessi J, Andersson P, Bertolo S, Butterworth A et al. CERN's Linac4 H ^- sources: Status and operational results. In Kraus W, McNeely P, editors, 4th International Symposium on Negative Ions, Beams and Sources, NIBS 2014. American Institute of Physics Inc. 2015. 030005. (AIP Conference Proceedings). doi: 10.1063/1.4916432

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abstract = " Two volume sources equipped with DESY and CERN plasma generators and a low voltage electron dump were operated at 45 kV in the Linac4 tunnel and on a dedicated test stand. These volume sources delivered approximately 20 mA and ensured the commissioning of the Radio Frequency Quadrupole accelerator and of the first section of the Drift Tube Linac. CERN's prototype of a cesiated surface source equipped with this electron dump was operated continuously from November 2013 to April 2014 on the ion source test stand and is being commissioned in the Linac4 tunnel. Before cesiation, the prototype conditioned in volume mode provided up to 30 mA H - beam. Short cesiations, of the order of 10 mg effectively reduced the intensity of co-extracted electrons down to 2 - 8 times the H - current; this cesiated surface operation mode delivered up to 60 mA H - beam. An H - beam of the order of 40 mA was sustained up to four weeks operation with 500 μs pulses at 1.2s spacing. A new extraction was designed to match these beam properties. A copy of BNL's magnetron produced at CERN was tested at BNL and delivered at 40 kV H - beam exceeding Linac4's nominal intensity of 80 mA. In this contribution, the performances, dynamic response to cesiation, stability and availability of these prototypes are described. The needed optimization of the emittance of H - beam above 40 mA is presented, which requires an evolution of the front end that encompasses implementation of a large ceramic insulator.",

author = "J. Lettry and D. Aguglia and J. Alessi and P. Andersson and S. Bertolo and A. Butterworth and Y. Coutron and A. Dallocchio and N. David and E. Chaudet and D. Fink and J. Gil-Flores and M. Garlasche and A. Grudiev and R. Guida and J. Hansen and M. Haase and A. Hatayama and A. Jones and I. Koszar and T. Lehn and C. Machado and C. Mastrostefano and S. Mathot and S. Mattei and O. Midttun and P. Moyret and D. Nisbet and K. Nishida and M. O'Neil and M. Paoluzzi and {Sanchez Alvarez}, J. and R. Scrivens and T. Shibata and D. Steyaert and N. Thaus and A. Zelenski",

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AU - Paoluzzi, M.

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AU - Shibata, T.

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