IBIC2015 - List of Authors (Miyahara, F.)

Paper	Title	Page
MOPB017	Development of FPBA-Based TDC With Wide Dynamic Range for Monitoring the Trigger Timing Distribution System at the KEKB Injector Linac	70
	T. Suwada, K. Furukawa, F. Miyahara KEK, Ibaraki, Japan
	A new field-programmable gate array (FPGA)-based time-to-digital converter (TDC) with a wide dynamic range greater than 20 ms has been developed to monitor the timing of various pulsed devices in the trigger timing distribution system of the KEKB injector linac. The pulsed devices are driven by feeding regular as well as any irregular (or event-based) timing pulses. For monitoring the timing as precisely as possible, a 16-ch FPGA-based TDC has been developed on a Xilinx Spartan-6 FPGA equipped on VME board with a time resolution of 1 ns. The resolution was achieved by applying a multisampling technique, and the accuracies were 2.6 ns (rms) and less than 1 ns (rms) within the dynamic ranges of 20 ms and 7.5 ms, respectively. The various nonlinear effects were improved by implementing a high-precision external clock with a built-in temperature-compensated crystal oscillator.
	Poster MOPB017 [3.237 MB]
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TUPB023	High Position Resolution BPM Readout System with Calibration Pulse Generators for KEK e⁺/e⁻ Linac	369
	F. Miyahara, K. Furukawa, M. Satoh, Y. Seimiya, T. Suwada KEK, Ibaraki, Japan R. Ichimiya JAEA, Aomori, Japan H.S. Saotome Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan
	The KEK e⁺/e⁻ injector linac will be operated in multiple modes for the electron beam injection to 3 independent storage rings, SuperKEKB HER, Photon Factory (PF) Ring and PF-AR, and the positron beam injection into the damping ring and the SuperKEKB LER. The operation modes can be switched every 20 milliseconds. The injector linac is under upgrade for the SuperKEKB, where the required resolution of beam position measurement is less than 10 micrometer. However, the current system based on oscilloscopes for stripline beam position monitors (BPMs) has the position resolution of 50 micrometers approximately. Thus, we have developed a new BPM readout system with narrow band pass filter, 16-bit, 250 MSa/s ADCs and calibration pulse generators. The system is based on VME standard and the beam position is calculated by FPGA on board. The new system has the position resolution of 3 micrometer and wide dynamic range from 0.1 to 10 nC/bunch. The calibration pulse follows every position measurement. The calibration pulse is used for the gain correction and the integrity monitor of the cable connection. We will report details of the system.
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Paper

Title

Page

Development of FPBA-Based TDC With Wide Dynamic Range for Monitoring the Trigger Timing Distribution System at the KEKB Injector Linac

70

T. Suwada, K. Furukawa, F. Miyahara
KEK, Ibaraki, Japan

A new field-programmable gate array (FPGA)-based time-to-digital converter (TDC) with a wide dynamic range greater than 20 ms has been developed to monitor the timing of various pulsed devices in the trigger timing distribution system of the KEKB injector linac. The pulsed devices are driven by feeding regular as well as any irregular (or event-based) timing pulses. For monitoring the timing as precisely as possible, a 16-ch FPGA-based TDC has been developed on a Xilinx Spartan-6 FPGA equipped on VME board with a time resolution of 1 ns. The resolution was achieved by applying a multisampling technique, and the accuracies were 2.6 ns (rms) and less than 1 ns (rms) within the dynamic ranges of 20 ms and 7.5 ms, respectively. The various nonlinear effects were improved by implementing a high-precision external clock with a built-in temperature-compensated crystal oscillator.

Poster MOPB017 [3.237 MB]

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TUPB023

High Position Resolution BPM Readout System with Calibration Pulse Generators for KEK e⁺/e⁻ Linac

369

F. Miyahara, K. Furukawa, M. Satoh, Y. Seimiya, T. Suwada
KEK, Ibaraki, Japan
R. Ichimiya
JAEA, Aomori, Japan
H.S. Saotome
Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan

The KEK e⁺/e⁻ injector linac will be operated in multiple modes for the electron beam injection to 3 independent storage rings, SuperKEKB HER, Photon Factory (PF) Ring and PF-AR, and the positron beam injection into the damping ring and the SuperKEKB LER. The operation modes can be switched every 20 milliseconds. The injector linac is under upgrade for the SuperKEKB, where the required resolution of beam position measurement is less than 10 micrometer. However, the current system based on oscilloscopes for stripline beam position monitors (BPMs) has the position resolution of 50 micrometers approximately. Thus, we have developed a new BPM readout system with narrow band pass filter, 16-bit, 250 MSa/s ADCs and calibration pulse generators. The system is based on VME standard and the beam position is calculated by FPGA on board. The new system has the position resolution of 3 micrometer and wide dynamic range from 0.1 to 10 nC/bunch. The calibration pulse follows every position measurement. The calibration pulse is used for the gain correction and the integrity monitor of the cable connection. We will report details of the system.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)