The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Keane, R.T. AU - Carwardine, J. AU - Deriy, B. AU - Fors, T. AU - Wang, J. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - R&D Progress on Precision Current Monitoring and Calibration Systems for the APS Upgrade Unipolar Magnet Power Supplies J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - The APS Upgrade storage ring multi-bend acromat lattice uses 1000 individually-powered multi-pole magnets operating at current levels to ~260A. Requirements for power-supply stability, repeatability and reproducibility are of the order of 10 ppm. MBA SR q u a d m a g n e t a n d Q - b e n d dipole magnet current regulation will require a higher level of accuracy, precision, stability, and independent control than existing APS systems. In order to meet these requirements, the upgrade will include the installation of 1000 new unipolar power supplies. To monitor and ensure the performance of the power supplies, an independent precision current measurement system is under development, based on a commercially available DCCT sensor. An in-situ calibration system is also required that will maintain the ensemble accuracy of the measurement system and magnet-to-magnet relative calibration by providing precise known calibration current to each of the 1000 DCCTs distributed around the 1100-meter ring. R&D on the in-situ cross-calibration scheme is being performed using a network of 6-8 full-spec DCCTs. This paper discusses the proposed approach, and results and lessons from the R&D program. PB - JACoW CP - Geneva, Switzerland SP - 428 EP - 430 KW - ion KW - power-supply KW - interface KW - controls KW - network DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-WEPCF06 UR - http://jacow.org/ibic2017/papers/wepcf06.pdf ER -