Ultra-Low Mass, High-Rate Charged Particle Tracking

High intensity experiments searching for very rare phenomena, such as neutrino-less coherent muon-to- electron conversion and muon decays to e+e-e- or to e- gamma, require precision charged particle tracking at low momenta in the 10 - 100 MeV/c range. Momentum resolutions of 0.1% are required in order to mitigate steeply falling physics backgrounds, necessitating ultra-low mass designs. We seek technologies capable of achieving 10-100 micron position resolution while operating in vacuum and handling average rates from 10 kHz/cm2 to 1 MHz. /cm2. The mass of these sensors and associated cooling and cabling must correspond to less than 50 microns of silicon per detector layer. Technologies to be considered include gas-filled aluminized mylar tubes with wall thickness less than 10 microns and thinned CMOS sensors. We also seek cooling technologies for CMOS sensors able to extract heat (~50-100 mW) to remote (~1 meter) heat sinks with minimal mass.