IPAC2013 - List of Authors (Nakamura, S.)

Paper	Title	Page
MOPWA006	Magnet Power Supply with Small Ripple using Sub-converter and Symmetrical Structure	675
	S. Nakamura J-PARC, KEK & JAEA, Ibaraki-ken, Japan S. Yamada KEK, Tokai, Ibaraki, Japan
	High precision tracking and small current ripple are necessary for a magnet power supply of a high power accelerator. A prototype power supply of the 100kW class is developed with an aim of small current ripple less than 10ppm, which employs a combination of main and sub-converter with symmetrical structure. The main converter unit supplies pattern current by a voltage feedforward control, while the sub-converters by a current feedback control. The symmetrical structure of the power supply is adopted to decouple normal mode and common mode ripples. Each converter unit is modularized and surrounded by a Faraday cage suppress for suppressing radiation of electrical noise and ease for maintenance. Its performance is studied using a set of 24 units of setupole magnets installed in J-PARC Main Ring.

Paper

Title

Page

Magnet Power Supply with Small Ripple using Sub-converter and Symmetrical Structure

675

S. Nakamura
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
S. Yamada
KEK, Tokai, Ibaraki, Japan

High precision tracking and small current ripple are necessary for a magnet power supply of a high power accelerator. A prototype power supply of the 100kW class is developed with an aim of small current ripple less than 10ppm, which employs a combination of main and sub-converter with symmetrical structure. The main converter unit supplies pattern current by a voltage feedforward control, while the sub-converters by a current feedback control. The symmetrical structure of the power supply is adopted to decouple normal mode and common mode ripples. Each converter unit is modularized and surrounded by a Faraday cage suppress for suppressing radiation of electrical noise and ease for maintenance. Its performance is studied using a set of 24 units of setupole magnets installed in J-PARC Main Ring.