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TY - CPAPER AU - Lobanov, N.R. AU - Linardakis, P. AU - Tsifakis, D. AU - Tunningley, T. TI - Ultra High Impedance Diagnostics of Electrostatic Accelerators with Improved Resolution J2 - Proc. of Heavy Ion Accelerator Technology Conference (HIAT2015), Yokohama, Japan, 7-11 September 2015 AB - This contribution describes new technique to diagnose faults with high-voltage components in electrostatic accelerators. The main application of this technique is non-invasive testing of high-voltage grading systems; measuring insulation resistance or; determining the volume and surface resistivity of insulation materials used in column posts and acceleration tubes. In addition, it allows verification of the continuity of the resistive divider assembly as a complete circuit. A simple and practical fault finding data interpretation procedure has been established based on simple concepts. As a result of efficient in-situ troubleshooting and fault elimination techniques, the maximum values of |ΔR/R| are kept below 2.5% at the conclusion of maintenance procedures. The 2015 and beyond acceptance margin was reduced further to below 1% by increasing the test voltage from 40 V to 100 V. The experimental verification of improved resolution has been conducted during recent scheduled accelerator maintenance in May-June 2015 when few unique fault categories have been identified by the ultra-high impedance technique. PB - JACoW CY - Geneva, Switzerland SP - 282 EP - 284 KW - acceleration KW - high-voltage KW - impedance KW - diagnostics KW - heavy-ion DA - 2016/02 PY - 2016 SN - 978-3-95450-131-1 DO - 10.18429/JACoW-HIAT2015-THM2C01 UR - http://accelconf.web.cern.ch/AccelConf/HIAT2015/papers/thm2c01.pdf ER -