Spatial and temporal profile monitor with nanosecond resolution for CERN's Linac4

作者：Hori M^*; Hanke K

来源：Journal of Instrumentation, 2012, 7: C04005.

DOI：10.1088/1748-0221/7/04/C04005

• Timing detectors
• Radiation-induced secondary-electron emission
• Beam-line instrumentation (beam position and profile monitors
• beam-intensity monitors
• bunch length monitors)

CERN's Linac4 will provide 160-MeV H- beams with an intensity of 2x10(14) ions s(-1). In the first section of Linac4, a beam chopper removes sequences of 500-ps-long microbunches from the H- beam. We developed a monitor to measure the time structure and spatial profile of this chopped beam with resolutions Delta t similar to 1 ns and Delta x similar to 2 mm. The large active area 40 mm x 40 mm and dynamic range of the detector also allows studies of beam halos. The H- beam first struck a carbon foil, and the resulting burst of secondary electrons were accelerated by a series of parallel grid electrodes. The electrons struck a phosphor screen, and the resulting image of the scintillation light was transported to a charge-coupled device camera. The time resolution was attained by applying high-voltage pulses of sub-nanosecond rise and fall times to the electrodes and phosphor screen.

• 出版日期2012-4