Development of a large-area timing and position-sensitive foil-MCP detector for mass measurements at the Rare-RI Ring in RIKEN
arxiv(2021)
摘要
To achieve high precision and accuracy for mass measurements of exotic nuclei
by Time-of-flight (TOF) methods: high-resolution beam-line magnetic-rigidity
time-of-flight (Bρ-TOF) and in-ring isochronous mass spectrometry (IMS), a
large-area electrostatic detector which possesses high position resolution and
good timing resolution at the same time is developed at the Rare-RI Ring in
RIBF, RIKEN Nishina Center, Japan. Besides TOF mass measurements, the detector
system will also be used for heavy ion beam trajectory monitoring or momentum
measurements for both beam-line and in-ring at the Rare-RI Ring. The position
and timing measurements of heavy ions are performed by detecting the secondary
electrons (SEs) emitted from a conversion foil during the passage of the ion.
The SEs are accelerated and bent with an angle of 90^∘ by electrostatic
fields onto a micro-channel-plate (MCP) electron multiplier which is coupled
with a position-sensitive delay-line anode. The dependence of the timing and
position resolution on applied high voltages of the detector potential plates
has been studied systematically via simulation and experimentally. An
isochronous condition of secondary electron transmission in the electrostatic
field of the detector is chosen to optimize the structure of the detector for
high performance. The best achieved timing resolution is less than 50 ps (in
σ) and position resolution ∼ 1 mm (in σ) for 2 dimensions,
respectively. The overall efficiency is ∼ 95% for heavy ion beam and
∼ 75% for α particle from ^241Am source.
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