Refined beam measurements on the SNS H-injector

B. X. Han; R. F. Welton; S. N. Murray; T. R. Pennisi; M. Santana; C. M. Stinson; M. P. Stockli

doi:10.1063/1.4995734

Refined beam measurements on the SNS H-injector

B. X. Han, R. F. Welton, S. N. Murray, T. R. Pennisi, M. Santana, C. M. Stinson, M. P. Stockli

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

9 Scopus citations

Abstract

The H^- injector for the SNS RFQ accelerator consists of an RF-driven, Cs-enhanced H-ion source and a compact, two-lens electrostatic LEBT. The LEBT output and the RFQ input beam current are measured by deflecting the beam on to an annular plate at the RFQ entrance. Our method and procedure have recently been refined to improve the measurement reliability and accuracy. The new measurements suggest that earlier measurements tended to underestimate the currents by 0-2 mA, but essentially confirm H-beam currents of 50-60 mA being injected into the RFQ. Emittance measurements conducted on a test stand featuring essentially the same H^- injector setup show that the normalized rms emittance with 0.5% threshold (99% inclusion of the total beam) is in a range of 0.25-0.4 mm·mrad for a 50-60 mA beam. The RFQ output current is monitored with a BCM toroid. Measurements as well as simulations with the PARMTEQ code indicate an underperforming transmission of the RFQ since around 2012.

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/10.1063/1.4995734
State	Published - Aug 9 2017
Externally published	Yes
Event	5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 - Oxford, United Kingdom Duration: Sep 12 2016 → Sep 16 2016

Publication series

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

Conference

Conference	5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016
Country/Territory	United Kingdom
City	Oxford
Period	09/12/16 → 09/16/16

Funding

This work was performed at Oak Ridge National Laboratory, which is managed by UT-Battelle, LLC, under contract number DE-AC05-00OR22725 for the United States Department of Energy.

Funders	Funder number
United States Department of Energy
Oak Ridge National Laboratory	DE-AC05-00OR22725

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10.1063/1.4995734

Cite this

Han, B. X., Welton, R. F., Murray, S. N., Pennisi, T. R., Santana, M., Stinson, C. M., & Stockli, M. P. (2017). Refined beam measurements on the SNS H-injector. In D. Faircloth (Ed.), 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 Article 030014 (AIP Conference Proceedings; Vol. 1869). American Institute of Physics Inc.. https://doi.org/10.1063/1.4995734

@inproceedings{28d95e992adb44ceb88262685f1d8602,

title = "Refined beam measurements on the SNS H-injector",

abstract = "The H- injector for the SNS RFQ accelerator consists of an RF-driven, Cs-enhanced H-ion source and a compact, two-lens electrostatic LEBT. The LEBT output and the RFQ input beam current are measured by deflecting the beam on to an annular plate at the RFQ entrance. Our method and procedure have recently been refined to improve the measurement reliability and accuracy. The new measurements suggest that earlier measurements tended to underestimate the currents by 0-2 mA, but essentially confirm H-beam currents of 50-60 mA being injected into the RFQ. Emittance measurements conducted on a test stand featuring essentially the same H- injector setup show that the normalized rms emittance with 0.5% threshold (99% inclusion of the total beam) is in a range of 0.25-0.4 mm·mrad for a 50-60 mA beam. The RFQ output current is monitored with a BCM toroid. Measurements as well as simulations with the PARMTEQ code indicate an underperforming transmission of the RFQ since around 2012.",

author = "Han, {B. X.} and Welton, {R. F.} and Murray, {S. N.} and Pennisi, {T. R.} and M. Santana and Stinson, {C. M.} and Stockli, {M. P.}",

year = "2017",

month = aug,

day = "9",

doi = "10.1063/1.4995734",

language = "English",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

editor = "Dan Faircloth",

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note = "5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 ; Conference date: 12-09-2016 Through 16-09-2016",

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Han, BX , Welton, RF, Murray, SN, Pennisi, TR, Santana, M, Stinson, CM & Stockli, MP 2017, Refined beam measurements on the SNS H-injector. in D Faircloth (ed.), 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016., 030014, AIP Conference Proceedings, vol. 1869, American Institute of Physics Inc., 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016, Oxford, United Kingdom, 09/12/16. https://doi.org/10.1063/1.4995734

Refined beam measurements on the SNS H-injector. / Han, B. X.; Welton, R. F.; Murray, S. N. et al.
5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016. ed. / Dan Faircloth. American Institute of Physics Inc., 2017. 030014 (AIP Conference Proceedings; Vol. 1869).

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

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ER -

Refined beam measurements on the SNS H-injector

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