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To achieve high precision and accuracy for mass measurements of exotic nucleiby Time-of-flight (TOF) methods: high-resolution beam-line magnetic-rigiditytime-of-flight (B$\rho$-TOF) and in-ring isochronous mass spectrometry (IMS), alarge-area electrostatic detector which possesses high position resolution andgood timing resolution at the same time is developed at the Rare-RI Ring inRIBF, RIKEN Nishina Center, Japan. Besides TOF mass measurements, the detectorsystem will also be used for heavy ion beam trajectory monitoring or momentummeasurements for both beam-line and in-ring at the Rare-RI Ring. The positionand timing measurements of heavy ions are performed by detecting the secondaryelectrons (SEs) emitted from a conversion foil during the passage of the ion.The SEs are accelerated and bent with an angle of $90^{\circ}$ by electrostaticfields onto a micro-channel-plate (MCP) electron multiplier which is coupledwith a position-sensitive delay-line anode. The dependence of the timing andposition resolution on applied high voltages of the detector potential plateshas been studied systematically via simulation and experimentally. Anisochronous condition of secondary electron transmission in the electrostaticfield of the detector is chosen to optimize the structure of the detector forhigh performance. The best achieved timing resolution is less than 50 ps (in$\sigma$) and position resolution $\sim$ 1 mm (in $\sigma$) for 2 dimensions,respectively. The overall efficiency is $\sim$ 95$\%$ for heavy ion beam and$\sim$ 75$\%$ for $\alpha$ particle from $^{241}$Am source.

Development of a large-area timing and position-sensitive foil-MCP detector for mass measurements at the Rare-RI Ring in RIKEN