The Main Injector Neutrino Upgrade (MINU) project will provide new service buildings to house new power supplies and new kicker magnet support equipment to support the future increase of the Nu Ml beam power from 400kW to 700 kW. The use of the accumulator ring for the stacking of protons is made possible as well. The project will require construction of two new service buildings around the Main Injector, Ml-14 and Ml-39, and one small addition at Ml-60 to house an anode power supply. The work will require excavation for installation of penetrations from the new service buildings to the existing Main Injector tunnel, excavation for building foundations at all three locations, utility installation in trenches for power and communication ductbanks, and industrial cooling water (ICW) piping. Floodplain mitigation for the area taken at Ml-14 and Space Compensation demolition for the entire area to be constructed is also required.

The multiplicity, i.e. the average number of neutrons m produced per incident particle in a neutron monitor increases with the energy of the producing radiation. A monitor designed to take maximum advantage of the information contained in this effect has been used to study the characteristics of the cosmic radiation at White Mountain (3800‐meters elevation) and at Palo Alto (sea level) during 1965. The energy dependence of the incident differential nucleonic flux was found to be N(E) ∼ E−γ, with γ, = 1.96 at 3800 meters and 2.20 at sea level. Barometric pressure coefficients for the total neutron counting rate were found to be −1.022 and −0.958% per mmHg at the mountain and sea‐level locations, respectively. These values are in good agreement with results previously reported for other neutron monitors. The pressure coefficients for the multiplicity m = 1 counting rates were found to be −0.97% per mmHg at 3800 meters and −0.89% per mmHg at sea level. At both elevations the coefficients increased with multiplicity to the same median value of about −1.13% per mmHg at m ≥ 7. The relatively lower values found for the pressure coefficients for the sea‐level total count and low multiplicity rates are attributed to a contribution by µ‐meson capture neutrons. Aside from the meson effect, the variation of the pressure coefficients with multicplicity is in qualitative agreement with the observed altitude variation of the spectral index γ.

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