Title :
High resolution analog/digital power supply controller
Author :
Medvedko, Evgeny ; Olsen, Jeff ; Leyh, Greg ; Smith, Stephen ; Hettel, Robert ; Wermelskirchen, Clemens ; Straumann, Till
Author_Institution :
Stanford Linear Accelerator Center, CA, USA
Abstract :
Corrector magnets for the SPEAR-3 synchrotron radiation source require precision, high-speed control for use with beam-based orbit feedback. A new Controller Analog/Digital Interface card (CANDI) has been developed for these purposes. The CANDI has a 24-bit DAC for current control and three 24-bit Δ-Σ ADCs to monitor current and voltages. The ADCs can be read and the DAC updated at the 4 kHz rate needed for feedback control. A precision 16-bit DAC provides on-board calibration. Programmable multiplexers control internal signal routing for calibration, testing, and measurement. Feedback can be closed internally on current setpoint, externally on supply current, or beam position. Prototype and production tests are reported in this paper. Noise is better than 17 effective bits in a 10 mHz to 2 kHz bandwidth. Linearity and temperature stability are excellent.
Keywords :
accelerator control systems; accelerator magnets; calibration; delta-sigma modulation; digital control; particle accelerator accessories; particle beam diagnostics; power supplies to apparatus; power supply circuits; programmable controllers; synchrotron radiation; 10 mHz to 2 kHz; 16 bit; 24 bit; 4 kHz; CANDI; Controller Analog/Digital Interface card; Delta-Sigma ADC; SPEAR-3 synchrotron radiation source; beam-based orbit feedback; corrector magnets; current control; feedback control; high resolution analog/digital power supply controller; high-speed control; linearity; noise; programmable multiplexers; temperature stability; Calibration; Current control; Digital control; Feedback control; Magnets; Monitoring; Multiplexing; Power supplies; Synchrotron radiation; Testing;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289469
