HIGS2 Workshop, June 3-4, 2013

Link to HIGS2 Workshop Site

This workshop will bring together physicists who are interested in conducting research at HIGS2, which will have more than two orders of magnitude higher gamma-ray beam intensity than is currently available at HIGS. Among the goals of the workshop are to identify the main research questions that can be addressed most effectively at HIGS2 relative to other facilities, to facilitate forming and strengthening collaborations to carry out research at HIGS2, and to develop technical specifications of the major instrumentation required to carryout the main research thrusts at HIGS2. The main tangible outcome of the workshop will be a whitepaper that describes the research opportunities made possible by HIGS2, gives technical details about HIGS2, specifies the capability requirements of the main instruments needed to carry out the envisaged research program, and identifies the community of physicists who would carryout the program.

The workshop will open on the morning of June 3 with overview talks on the research topics to be discussed at the workshop and on the HIGS2 accelerator design. In the afternoon of the first day (June 3) and morning of the second day (June 4), topical working group sessions will be held where participants will present short talks and discuss proposed research at HIGS2. The talks in these sessions will be selected from the submitted abstracts.

Sponsored by the Duke University Office of Global Strategy and Programs through the Phillips Endowment.


HIGS2:Contribution to the Report of the NSAC subcommittee on implementing the 2007 Long Range Plan

Physics Opportunities at a Proposed Upgrade of the High Intensity Gamma Source at the Duke Free Electron Laser Lab and Triangle Universities Nuclear Lab: HIGS2

The HIGS2 is a proposed complementary gamma-ray source to the existing FEL driven gamma-ray source at the High Intensity Gamma-Ray Source (HIGS) facility at the Triangle Universities Nuclear Laboratory (TUNL). This next-generation Compton gamma-ray source will add to the gamma-ray capabilities at the HIGS in the energy range of about 2 to 12 MeV. Driven by a high average-power Fabry-Perot resonator, the HIGS2 will produce gamma-ray beams with intensities more than two orders of magnitude and with better energy resolution than the current source at HIGS. The HIGS2 will offer highly polarized beams of circular polarization with the capability of rapid helicity switching. Once installed, the HIGS2 capabilities will be available to experimentalists in addition to the beam capabilities of the existing FEL driven source.

We intend to produce a white paper that will explore the physics research opportunities at the HIGS2 facility at TUNL. The focus areas are nuclear astrophysics, hadronic parity violation, and the search for physics beyond the standard model (BSM). The white paper will include an estimated range of design parameters and performance specifications for the HIGS2 and the new experimental opportunities made possible by the capabilities of the HIGS2.

The three Foci:

1) Nuclear Astrophysics. Co-convenors: Art Champagne and Calvin Howell

2) Hadronic Parity Violation. Co-convenors: Mike Snow and Roxanne Springer

3) Beyond the Standard Model . Co-convenors: Reyco Henning and Jesse Thaler

We request proposals from the community, in the form of a roughly one page prospectus that includes:

1) the physics motivation and potential impact on one of the above foci and impact on the DOE Nuclear Physics Performance Measures (see link above);

2) the machine performance specifications required to carry out the envisioned experiment even if it is outside the estimated machine capabilities described below;

3) a brief description of the experimental design including: (i) target type, (ii) detectors, (iii) required energy resolution and experimental uncertainty, (iv) counting rate estimates, and (v) estimated total beam time needed to carry out the measurement (including background measurements using beam).

Please send your submission to the email address that most closely fits its subfield by July 6th, 2012:

1) Nuclear Astrophysics higs_astro@tunl.duke.edu
2) Hadronic Parity Violation higs_pv@phy.duke.edu
3) Beyond the Standard Model higs_bsm@tunl.duke.edu

If you wish to contribute to the white paper but need more time please contact us. Our goal is to have a document that summarizes our preliminary findings (executive summary with bullet points) ready for distribution by mid August. This timeline is driven by the aim of submitting highlights from the document to the NSAC prioritization subcommittee prior to their deliberations meeting this summer. A more complete version of the white paper will be posted online this fall as part of the preparation for having a HIGS2 workshop to be held in the summer of 2013.

Proposed Machine Parameters and Concept