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TY - CONF AU - Proft, D. AU - Hillert, W. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - A New FPGA Based Timing System at ELSA J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - At the electron stretcher facility ELSA a beam intensity upgrade from 20 mA to 200 mA is in progress. Investigations showed, that the maximum beam current is currently limited by excitation of beam instabilities. For separated characterization of single bunch instabilities from multi-bunch ones, a high beam current stored in a single revolving bunch is required. These high beam currents can only be achieved by accumulation of many shots from the injector. The existing timing system is not capable of single bunch injection and accumulation in the main stretcher ring. Therefore a new FPGA based timing system, synchronized to the RF system of the accelerator, has been developed which will completely supersede the existing one. Simultaneously the ‘‘slow'' timing system, providing trigger signals for the typically 6 s long accelerator cycle, is also modernized using a similar FPGA based solution to achieve a much better duty cycle during standard operation. In this contribution the FPGA designs laying the focus on the single bunch accumulation will be presented. PB - JACoW CP - Geneva, Switzerland SP - 802 EP - 804 KW - timing KW - FPGA KW - injection KW - booster KW - extraction DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-MOPHA012 UR - http://jacow.org/ipac2015/papers/mopha012.pdf ER -