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We present results from a preliminary assessment, via computer simulations, of the electron-cloud density for the FNAL Main Injector upgrade at injection energy. Assuming a peak value for secondary emission yield {delta}{sub max} = 1.3, we find a threshold value of the bunch population, N{sub b,th} {approx_equal} 1.25 x 10{sup 11}, beyond which the electron-cloud density {rho}{sub e} reaches a steady-state level that is {approx}10{sup 4} times larger than for N{sub b} < N{sub b,th}, essentially neutralizing the beam, and leading to a tune shift {approx}0.05. Our investigation is limited to a field-free region and to a dipole magnet region, both of which yield similar results for both N{sub b,th} and the steady-state value of {rho}{sub e}. Possible dynamical effects from the electron cloud on the beam, such as emittance growth and instabilities, remain to be investigated separately

A preliminary assessment of the electron-cloud effect for the FNAL main injector upgrade