This summer, that process began. Marc-Andre Drouin and Karel Kasl, control system programmers for ELI, spent three months at LLNL working with the HAPLS integrated control system team. During their time at LLNL, they focused almost exclusively on the ELI-HAPLS timing interface, which allows exact synchronization of HAPLS to the ELI Beamlines master clock.
"The HAPLS timing system must be able to operate independent of the ELI timing system," Drouin said. "But, it also needs to be capable of being perfectly synchronized to ELI. That bridge between timing systems is what we have been working on - making sure HAPLS runs very well independently as well as integrating with ELI."
Haefner pointed out that while HAPLS is a major component, it becomes a subsystem when it moves to the ELI facility. Once at ELI, HAPLS will integrate with the wider user facility, consisting of target systems, experimental systems, diagnostic systems - all of which have to be timed and fed from a master clock.
Kasl likened the master clock to a universal clock used by an office. "We brought the clock here, and now everyone in the office is using the clock to synchronize their work," he said.
The master clock, built by ELI, was programmed as a bridge between the ELI and HAPLS timing systems. During their time at LLNL, Drouin and Kasl worked on configuring that hardware and writing the software that talks to the clock and to the subcomponents that control a very precise sequence of events.
Last week, the ELI team finished their three-month stint at LLNL, but will be back in early fall to continue work - and they're looking forward to it.
"This unit is going to get integrated with our other systems, so there needs to be an overlap between the two teams," Kasl said.
"It's good experience for us to learn about the internal workings of the HAPLS syst
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