Optical link system J-PARC linac high frequency reference signal distribution system-J-PARC linac high frequency reference signal distribution system

Optical link system J-PARC linac high frequency reference signal distribution system
Graviton Co., Ltd.

About This Product

A diagram showing a reference signal distribution system configuration diagram is shown. A highly stable 12MHz RF reference signal is transmitted from the central control room (CCR) to the linac via optical cable.

The newly developed dedicated E/O is used for optical conversion in CCR. At the most upstream part of the linac, the reference signal transmitted from the CCR is directly amplified by an optical amplifier (Max: +21 dBm) and distributed to approximately 60 low-level RF control (LLRF) stations using an optical coupler. A wavelength of 1,550 nm was selected for use with an optical amplifier.

One optical cable is used to transmit data for four klystrons (corresponding to one high-voltage DC power supply), resulting in a total of 17 systems. One transmission destination branches into 5 branches, and one is returned upstream for phase monitoring. The remaining four signals are distributed to each LLRF station. Each LLRF station that receives the optical signal uses this 12MHz as a reference to phase-lock and generates a highly pure acceleration signal of 324MHz. The loop filter of the PLL here can absorb the fast (approximately 1kHz or more) repetitive jitter of the 12MHz reference signal.

Digital feedback control is used to control cavity phase fluctuations and beam loading, and an I/Q modulator is used to stabilize the amplitude and phase. These signal generation and feedback control systems will be fabricated as cPCI modules.

A phase stabilized optical fiber (PSOF) is used for optical transmission of the reference signal. PSOF achieves an excellent temperature coefficient by giving the secondary coating of the core wire a negative expansion coefficient. Currently, only Furukawa Electric manufactures PSOF. As a result of evaluating its temperature characteristics, the optical cable needs to be kept at a constant temperature in order to achieve the necessary phase stability for the gallery's air conditioner, which is 27±2°C.

Therefore, this optical cable is installed in an insulated duct. Cooling water pipes controlled at ±0.1°C are run inside the ducts. The measured temperature coefficient of Furukawa Electric's PSOF is 0.2°/300m/℃ (972MH), and if the phase fluctuation of the optical cable alone is within ±0.1℃ over 300m, the temperature of the optical cable must be maintained within ±0.5℃. It won't happen.

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Optical link system J-PARC linac high frequency reference signal distribution system

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Graviton Co., Ltd.

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1 Models of Optical link system J-PARC linac high frequency reference signal distribution system

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Graviton Co., Ltd.

Japan

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Optical link system J-PARC linac high frequency reference signal distribution system Graviton Co., Ltd.

About This Product

1 Models of Optical link system J-PARC linac high frequency reference signal distribution system

J-PARC linac high frequency reference signal distribution system

Other products of Graviton Co., Ltd.

About Company Handling This Product

Optical link system J-PARC linac high frequency reference signal distribution system
Graviton Co., Ltd.