p. Carbon-Based Beam Window Development

Grant applications are sought for the development of carbon-based beam windows for secondary particle production. Production of secondary particle beams require "beam windows" that isolate the target (usually in air) from the primary particle beam vacuum. Expected increases in beam power and intensity require advanced beam window solutions, such as the use of carbon-based materials. Beam windows using carbon materials (such as glassy carbon) must withstand the interaction with the high power primary beam (1 to 4 MW; at a Gaussian beam profile sigma radius down to ~1.5 mm; 10 microsec pulses; ~1 Hz), the pressure differential across the window (2 to 4 bar), and erosion caused by oxidation at elevated temperatures on the air-side of the window. The window’s interaction with the beam has the potential to create thermal shock, radiation damage, and high temperatures. Cooling of the beam windows is considered critical to this development. Applications for the use of such beam windows require solutions for beam apertures ranging from 2 cm to 10 cm in diameter.

r. MAX Phase Material Development for High Power Targets

Particle production facilities (target facilities) require thermal shock and radiation tolerant materials for use as beam windows, targets, collimators, and/or absorbers. Expected increases in beam power and intensity require advanced material solutions, such as the use of MAX phase materials [1]. Targetry components must withstand the interaction with the high power beam (1 to 4 MW at a Gaussian beam profile sigma radius down to ~1.5 mm; 10 microsec pulses; ~1 Hz). Interaction with the beam has the potential to create thermal shock, radiation damage, and high temperatures. Applications for the use of such targetry components require solutions for beam apertures ranging from 2 cm to 10 cm in diameter and effective thicknesses of 1 mm up to 1 meter. [3]

t. Radiation Shielding Foam

Grant applications are sought for the development of radiation resistant foam to aid radiation shielding and sealing in radioactive environments. The foam should expand when applied, but still maintain a reasonably high density for shielding purposes (0.1 – 1.0 g/cc). Dopants to absorb neutrons would be advantageous. The foam should also produce a good air seal (like caulk) and maintain that seal during exposure. Doses of 1 megagray and above should be considered.

Questions – Contact: John Boger, john.boger@science.doe.gov

Reference

1. Proton Improvement Plan-II, December 2013, Rev. 1.1
2. Hurh, P., et al., 2013, Targetry Challenges at Megawatt Proton Accelerator Facilities, Proceedings of the 4th International Particle Accelerator Conference, THPFI082, IPAC13, Shanghai
3. Tallman, D.J., et al., 2015, Effect of Neutron Irradiation on Select MAX Phases, Acta Materialia, pp. 85, 132-143,