| Paper |
Title |
Page |
| TUP002 |
High-Dynamic-Range Current Measurements in the Medium-Energy Beta Transport Line at the Spallation Neutron Source
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244 |
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- D. A. Bartkoski, A. V. Aleksandrov, D. E. Anderson, M. T. Crofford, C. Deibele, S. Henderson, J. C. Patterson, C. Sibley, A. Webster
ORNL, Oak Ridge, Tennessee
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It is desired to measure the effectiveness of the LEBT (low energy beta transport) chopper system. Since this chopper is required to chop the H- beam to a 1% level, it is required therefore to accurately measure the beam during the chop. A system is developed with a high dynamic range that can both accurately measure the beam to tune the chopper system as well as provide an input to the MPS (machine protection system) to stop the beam in the event of a chopper system failure. A system description, beam based calibration, and beam measurements are included.
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| TUP003 |
Spallation Neutron Source Linac Beam Position and Phase Monitor System
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247 |
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- J. F. Power, M. W. Stettler
LANL, Los Alamos, New Mexico
- A. V. Aleksandrov, S. Assadi, W. Blokland, P. Chu, C. Deibele, J. Galambos, C. D. Long, J. Pogge, A. Webster
ORNL, Oak Ridge, Tennessee
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The SNS linac currently has 6x beam position monitors which allow the measurement of both beam position and phase from a single pickup. The signals from the pickup lobes are down converted from either 402.5MHz or 805 MHz to 50-MHz IF signals for processing. The IF signals are synchronously sampled at 40 MHz to generate I and Q signals from which the beam position and phase are calculated. Each BPM sampling reference frequency is locked to a phase-stable 2.5 MHz signal distributed along the linac. The system is continuously calibrated by generating and measuring rf bursts in the processor that travel to the BPM pickup, reflect off of the shorted BPM lobes and return to the processor for re-measurement. The electronics are built in a PCI card format and controlled vith LabVIEW. Details of the system design and performance are presented.
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