Improvement of MicroTCA-based image processing system at SPring-8

In SPring-8, various charged-coupled device (CCD) cameras with Camera Link interfaces have been widely used for electron beam diagnostics of accelerators. We have developed MicroTCA-based image processing system for Camera Link I/F camera as a candidate for the next generation front-end computer. The MicroTCA image processing system has been first applied to upgrade of the two-dimensional (2D) synchrotron radiation interferometer operating at the storage ring (SR) in 2013. In 2015, it has been applied to upgrade of optical transition radiation (OTR) monitor operating at the injection part of SR. We have improved the image processing system by modifying the problem found in actual operations. In a particular operation mode involving a high-current single bunch, it was found a trouble that camera takes unexpected image by noise enters the trigger line. In addition to noise suppression by a ferrite core, we have improved the image processing FPGA logic. There was a trouble every two months that the Linux kernel kills the image data acquisition process in 1 Hz cycle operation. We have found and fixed memory leak in the device driver, then we have achieved the long-term operational stability. We have realized hot swapping of AMCs by notifying the hot-plug event to the Linux kernel using the fake Hot-Plug driver. We are developing implementation using high-performance FPGA AMC compliant with the MTCA.4 standard for performing real-time reconstruction of electron bunch charge distribution measurement. (author)