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Status of the RF-driven H⁻ ion source for J-PARC linac
The Review of Scientific Instruments
|March 3, 2016
Summary
A new RF-driven negative hydrogen ion source was installed at the Japan Proton Accelerator Research Complex, achieving 33 mA beam current and over 1100 hours of stable operation with minimal sparking.
Area of Science:
- Accelerator Physics
- Plasma Physics
- Ion Source Technology
Background:
- The Japan Proton Accelerator Research Complex (J-PARC) linac requires an upgrade in beam current.
- A reliable and high-current negative hydrogen ion source is crucial for accelerator performance.
Purpose of the Study:
- To report on the installation and operational performance of a new cesiated RF-driven negative hydrogen ion source for the J-PARC linac upgrade.
- To evaluate the source's beam current, duty factor, operational stability, and reliability.
Main Methods:
- Installation of a cesiated RF-driven negative hydrogen ion source during the 2014 summer shutdown.
- Commencement of operations on September 29, 2014.
- Monitoring of beam current, duty factor, operational hours, and spark rate.
Main Results:
- Successful operation achieved with a beam current of 33 mA and a duty factor of 1.25% (500 μs, 25 Hz).
- Demonstrated capability for continuous operation for approximately 1100 hours.
- Observed spark rate at the beam extractor was less than once per day, meeting operational requirements.
Conclusions:
- The newly installed RF-driven negative hydrogen ion source meets the upgrade requirements for the J-PARC linac.
- The source exhibits excellent operational stability and reliability, suitable for user operation.
- Minor issues like antenna failure were resolved without significant impact on overall performance.
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