| Paper | Title | Page |
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| TUP065 | PC 104 Embedded IOCs at Jefferson Lab | 230 |
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Funding: Authored by Jefferson Science Associates, LLC under U. S. DOE Contract No. DE-AC05-06OR23177. We have developed PC 104 single board computer (SBC) based embedded IOCs for our low level control systems. The PC 104 IOCs runs the operating system RTEMS and EPICS. Two types of control system configurations were used in our different applications, PC 104 SBC with commercial I/O cards and PC 104 SBC with custom designed FPGA-based boards. RTEMS was built with CEXP shell to run on the PC 104 SBC. CEXP shell provides the function of dynamic object loading, which is similar to the widely used VxWorks operating system. Standard software configurations were setup for IOC application development to ease the conversion of applications from VME based IOCs to PC 104 IOCs. Many new projects at Jefferson Lab are going to employ PC 104 SBCs as IOCs. Some applications have already been running PC 104 IOCs for accelerator operations. They have been proven to be reliable, easy to configure and low maintenance IOC platforms. The PC 104 - RTEMS IOC provides a free open source Real-Time Operating System (RTOS), low cost, easily installed, flexible, and reliable solution for accelerator control and 12GeV Upgrade projects. |
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| WEP092 | New Beam Loss Monitor for 12 GeV Upgrade | 582 |
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Funding: Authored by Jefferson Science Associates, LLC under U. S. DOE Contract No. DE-AC05-06OR23177 This paper describes a new VME based machine protection Beam Loss Monitor(BLM) signal processing board designed at Jefferson Lab which features high sensitivity, high resolution, and low cost per channel. Photomultiplier based BLMs are used to detect bremsstrahlung from low level beam loss during tune-up and beam operations and to provide a machine protection trip before the beam can damage accelerator components. Typically, the two functions are incompatible as the display of instantaneous low level loss requires a fast low noise, wide dynamic range signal processor while machine protection requires some form of high level integrating signal processor. The new 8-channel BLM card has linear, logarithmic, and integrating amplifiers that simultaneously provide the optimal signal processing for each application. Amplified signals are digitized and then further processed through a FPGA. Combining both the diagnostic and machine protection functions in each channel allows the operator to tune-up and monitor beam operations. Other features include extensive built-in-self-test, fast shutdown interface(FSD), and 16-Mbit buffers for beam loss transient play-back. |