Speaker
Description
The J-PARC Main Ring (MR) is progressing toward the delivery of a 1.3 MW proton beam to the Hyper-Kamiokande neutrino experiment by 2028. To achieve this, the number of protons per pulse (ppp) will increase from 2.3E14 to3.1E14 ppp along with a reduction in the repetition cycle from 1.32 s to 1.16 s.
To accommodate the resulting increase in beam loading, the required anode current—supplying power to two 600 kW tetrode vacuum tubes—will approach the maximum rated capacity of 127 A, based on the current cavity configuration and voltage pattern. The generator current from the RF amplifier sustains the cavity gap voltage, which corresponds to the vector sum of the beam-induced current and the generator current.
The digital Low-Level RF (LLRF) control system, implemented in 2019, ensures stability of both the cavity voltage and phase via active feedback control. Key signals such as the LLRF driving RF signal, the gap voltage signal, and the beam signal provide insights into the dynamic behavior of the system.
In this presentation, we will present measurements of these three RF signals and illustrate their interrelationship using a phasor diagram. We will also discuss potential modifications to the LLRF control system to enable integrated real-time analysis based on this measurement approach.
| Abstract Category | Measurement and Control |
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