ABSTRACT
ICALEPCS 2001

Abstracts



WEAP008 (Poster)

Presenter: Shuchen Kate Feng (BNL)
email: feng1@bnl.gov
Review Status: Proceedings Ready - 02/01/02
FullText: pdf
Eprint: physics/0111200

Upgrade of the SDL Control System {*}

S.K. Feng, W.S. Graves, Y.N. Tang (BNL)

The Source Development Lab (SDL) at BNL consists of a 230 MeV electron linac and a 10 m long wiggler for short wavelength FEL development. The original control system [1] was based on the one in use at the NSLS. In 2000 the control system was upgraded to be based on EPICS. The FEL begins commissioning in May 2001. Here, the linac control system and oscilloscope (waveform digitizer) control/display are described. The linac control system, consisting of a MVME2301 PPC/CAMAC/EPICS IOC core in low level control, is implemented with the medm tool of EPICS to provide friendly Graphical User Interfaces (GUIs). The 1GHZ/250MHZ VXI waveform digitizer control and display, consisting of a MVME2301 PPC/VMEMXI-II/MXIVXI-II/VXI scopes/EPICS IOC core in low level control, is developed with the medm tool and Cartesian plotting to effectively present the required information. The low-level driver reads out 1024 points x 16 bit of data per waveform from each scope channel via a memory-mapped Fast Data Channel. At an early stage of software development with EPICS, the ten channel scopes performed at 2 Hz of GUI waveform display refresh rate when the records were scanned periodically. After further enhancement of real-time programming by employing EPICS IOC event scan and scope driver interrupts, the ten channel scopes, while running simultaneously, achieved 10 Hz of GUI waveform display refresh rate on two channels and 6-7 Hz of GUI waveform display refresh rate on the other eight channels.
[1] [1] W.S. Graves, S.K. Feng, P.S. Pearson, J.D. Smith,'Innovative Aspects of the SDL Control System', Proc. PAC97 (Vancouver, 12-16 May 2001)
{*} Work supported by US Department of Energy
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ICALEPCS 2001

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