| Paper |
Title |
Page |
| TUP030 |
RF Cavity Performance and RF Infrastructure for the ISAC-II Superconducting Linac
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309 |
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- R. E. Laxdal, I. Bylinskii, K. Fong, M. P. Laverty, A. K. Mitra, T. C. Ries, Q. Zheng, V. Zviagintsev
TRIUMF, Vancouver
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The ISAC-II superconducting linac is presently being commissioned. Twenty cavities have been prepared and characterized in single cavity tests before mounting in the on-line cryomodules. The cavities are specified to operate at a challenging peak surface field of 30MV to supply an accelerating voltage of 1.1MV/cavity. The cavity bandwidth of ±20Hz is achieved by overcoupling while a mechanical tuner actively maintains the cavity frequency within this bandwidth. An overview of the rf systems will be given. We will describe the early operating experience and compare the cavity on-line performance with the single cavity characterizations.
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| THP012 |
Adaptive Tuner Control in TRIUMF ISAC 2 Superconducting LINAC using Kalman Filter
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592 |
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- K. Fong, M. P. Laverty, Q. Zheng
TRIUMF, Vancouver
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The TRIUMF ISAC 2 RF control system uses phase locking self-excited control. Amplitude, phase and frequency control is achieved with I/Q voltage injection, and forward RF power is minimized with a tuner feedback loop. The phase difference between the input coupler and the output pickup drives a velocity servo system to provide tuning control. However, the presence of microphonics in the cryomodule, although under control by the Quadrature loop, still presents a noisy interference on the phase difference for the tuner. The tuner will follow this noise and generate more microphonics as a result. A first-order Kalman filter is used for an estimation of the phase difference and reduces the movement of the tuner.
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