| Paper | Title | Page |
|---|---|---|
TUPB66 |
A Beam Tail Monitoring System of a High Intensity Beam to the Main Ring of J-PARC | |
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| We have established a real-time beam-tail monitoring system using long air ionization chambers (AICs) and collimators of the beam transport line to the main ring of J-PARC. The collimators remove the beam tail components outside the emittance of 54pi mm mrad for horizontal and 60pi mm mrad for vertical, and the AICs identify the beam loss power at the collimators. The intentional beam losses have been used to calibrate the AICs. The output response showed good linearity up to the intensity of 8.4·1011/batch, which amounts to 1% of the designed beam intensity of 8·1013/batch, and the estimated error was ±7% which includes a dependence of beam loss points on the collimators and the shot-by-shot beam fluctuations. The calibration procedures and the performances of the system will be described. | ||