Speaker
Description
The J-PARC linac accelerates a 50 mA H⁻ beam up to 400 MeV for user
operation. To mitigate emittance growth caused by space-charge effects,
transverse beam profiles are measured using wire scanner monitors (WSMs)
for routine beam tuning. Tungsten is generally used as the wire
material. However, the WSMs employ carbon nanotube (CNT) wires in the low-energy region between the RFQ and DTL, because the beam energy is low as 3 MeV and the thermal load is substantial. CNT wires were introduced in 2017 as a more heat-resistant alternative, and since then they have
operated without replacement due to beam-induced damage, demonstrating
excellent durability. In this study, we report beam profile measurements
obtained with the CNT WSM at various beam energies.
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