Panel Determines Lab’s Future Science

  • PAC 45

Program Advisory Committee

Additional experiments approved for 12 GeV CEBAF.

It’s a physicist’s rite of passage. Long before researchers can get to the nitty-gritty of running an experiment -- such as installing the hardware, snagging the best run shifts, or debugging the analyzer -- they have to convince the Program Advisory Committee of its merits.

The Jefferson Lab PAC reviews scientific proposals and provides advice on scientific merit, technical feasibility and resource requirements. Every experiment that proposes to use the lab’s Continuous Electron Beam Accelerator Facility must pass this review with a letter grade denoting its scientific rating and suggested allocation of CEBAF beam time.

In mid-July, while the dog days of summer were in full force, a wide-ranging field of experiments went under the microscope of the 13-member 45th Jefferson Lab Program Advisory Committee (PAC45). The proposals consisted of 10 new experiments, one run group (includes several experiments to run at the same time), as well as an 11th proposal that was withdrawn early in the process.

“In general, we see an improvement in the impact of the physics issues identified, and in the preparation of the proposals,” wrote Jim Napolitano, PAC45 Chairperson and a professor and department chair of Temple University’s Physics Department. “As always, our overriding concern is the quality of the physics that will be reached.”

Of the new proposals considered, four were recommended for approval, two were conditionally approved, and five were deferred. One approved experiment received the coveted designation of “high impact” – meaning the result is expected to have a marked impact on the field of nuclear physics.

The PAC also took a second look at two previously submitted proposals that were conditionally approved to determine if the questions about the proposed science or equipment had been resolved. One was approved, bringing the new total to five.

Including all of the prior experiments presented to PAC, 78 experiments have now been approved for running with the 12 GeV Upgraded CEBAF. Thus far, four have been completed, with 74 remaining.

“Beam time at this world-class facility is precious, and we are pleased and grateful to contribute to the decision-making process,” Napolitano wrote.

The PAC also commented on proposed additions to three previously approved run groups. Further, the PAC provided feedback on three letters of intent for experiments that are in the early stages of planning and have not yet been officially proposed.

“We are very excited to add these new experiments to the Jefferson Lab scientific program,” said Bob McKeown, Jefferson Lab’s Deputy Director for Science. “The 78 approved experiments comprise a rich and diverse program of future physics that capitalizes on the 12 GeV Upgrade.”

You can find the full report posted on the PAC45 webpage: