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- W2142777873 abstract "LEP RF system is installed as independent 16 cavity units. In addition to the eight copper cavity units originally installed 12 units with super-conducting cavities are being added for the LEP200 energy upgrade. The total RF voltage determines the synchrotron tune (Q/sub s/) and must be controlled precisely during energy ramping. Local function generators in each of the RF units are pre-loaded such that when triggered simultaneously by ramp timing events transmitted over the general timing system the total voltage varies to give the Q/sub s/ function required. A disadvantage is that loss of RF in a unit at any time after the loading process cannot be corrected. As the number of RF units increases automatic control of the total RF voltage and its distribution around LEP becomes desirable. A global voltage control system, based on a central VME controller, has recently been installed. It has direct and rapid access to the RF units over the LEP time division multiplexing system. Initial tests on operation and performance at fixed energy and during energy ramping are described, as well as the implementation of a Q/sub s/ loop in which Q/sub s/ can be set directly using on-line synchrotron frequency measurements. >" @default.
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- W2142777873 date "2002-12-30" @default.
- W2142777873 modified "2023-09-28" @default.
- W2142777873 title "Global voltage control for the LEP RF system" @default.
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- W2142777873 doi "https://doi.org/10.1109/pac.1993.309171" @default.
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