Reduction of beam current noise in the FNAL magnetron ion source

Bollinger, D. S.; Karns, P. R.; Tan, Cheng‐Yang

doi:10.1063/1.4916482

Cited by 5 publications

(4 citation statements)

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“…During single turn injection into the FNAL 8 GeV Booster ring, there is a bunch by bunch variation on the beam current [10]. One possibility is that the variation in beam current originates in the ion source and is preserved through the linac.…”

Section: Gas Mixture Studiesmentioning

confidence: 99%

Overview of recent studies and design changes for the FNAL magnetron ion source

Bollinger

Sosa

2017

AIP Conference Proceedings

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This paper will cover several studies and design changes that will eventually be implemented to the Fermi National Accelerator Laboratory (FNAL) magnetron ion source. The topics include tungsten cathode insert, solenoid gas valves, current controlled arc pulser, cesium boiler redesign, gas mixtures of hydrogen and nitrogen, and duty factor reduction. The studies were performed on the FNAL test stand described in [1], with the aim to improve source lifetime, stability, and reducing the amount of tuning needed.

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Section: Gas Mixture Studiesmentioning

confidence: 99%

Overview of recent studies and design changes for the FNAL magnetron ion source

Bollinger

Sosa

2017

AIP Conference Proceedings

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“…Earlier studies have been performed exploring different methods of reducing the beam current noise of the magnetron [16]. It has been previously suggested that adding a small amount (1% in volume) of N 2 gas decreases the modulation or noise of the extracted beam current [17,18].…”

Section: Beam Current Noisementioning

confidence: 99%

Improvements on the stability and operation of a magnetron H− ion source

Sosa

Bollinger

Karns

et al. 2017

Phys. Rev. Accel. Beams

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The magnetron H − ion sources developed in the 1970s currently in operation at Fermilab provide beam to the rest of the accelerator complex. A series of modifications to these sources have been tested in a dedicated off-line test stand with the aim of improving different operational issues. The solenoid type gas valve was tested as an alternative to the piezoelectric gas valve in order to avoid its temperature dependence. A new cesium oven was designed and tested in order to avoid glass pieces that were present with the previous oven, improve thermal insulation and fine-tune its temperature. A current-regulated arc modulator was developed to run the ion source at a constant arc current, providing very stable beam outputs during operations. In order to reduce beam noise, the addition of small amounts of N 2 gas was explored, as well as testing different cathode shapes with increasing plasma volume. This paper summarizes the studies and modifications done in the source over the past three years with the aim of improving its stability, reliability and overall performance.

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“…The new style magnetron has just a dimple facing the extraction aperture. A series of cathode designs were tested [14] that varied the cathode shape and decreased the cathode volume, thus increasing the plasma volume. These variations to the cathode shape are shown in Figure 39.…”

Section: Cathode Geometry and Plasma Volumementioning

confidence: 99%

Commissioning and Operation of the FNAL Front end Injection Line and Ion Sources.

Karns

2015

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Tayloe. I would also like to thank William Barletta, Irina Novitski, and especially Susan Winchester for managing the USPAS program and making the logistics of this program easy to navigate. I would like to thank Bill Pellico and Fernanda G. Garcia for allowing me to participate in this program. I would also like to thank Dan Bollinger for all his help and guidance and turning a thesis project into a vocation in Sourcery. I would also like to thank

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Reduction of beam current noise in the FNAL magnetron ion source

Cited by 5 publications

References 0 publications

Overview of recent studies and design changes for the FNAL magnetron ion source

Overview of recent studies and design changes for the FNAL magnetron ion source

Improvements on the stability and operation of a magnetron H− ion source

Commissioning and Operation of the FNAL Front end Injection Line and Ion Sources.

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