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 |
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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 | |
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 |
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Volume | 1869 |
ISSN (Print) | 0094-243X |
ISSN (Electronic) | 1551-7616 |
Conference
Conference | 5th International Symposium on Negative Ions, Beams and Sources, NIBS 2016 |
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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.