We describe a redesign of the MIT long-pulse CARM oscillator experiment including the incorportation of an improved Bragg resonator design. The first MIT long-pulse CARM oscillator experiment, which was carried out last year, resulted in the observation of CARM operation at ∼ 30 GHz. However, the excited modes were the result of window reflections rather than Bragg resonator modes, and the device efficiency was low. Two substantial improvements are being incorporated into the CARM oscillator redesign. First, a new 700 kV electron gun, built by Thomson Tubes Electronique, will substantially improve the beam quality. Simulations predicting a substantially enhanced beam quality will be presented. Second, a new improved Bragg resonator design will be used. In this improved design, both scattering matrix and coupled-mode theory codes will be used to optimize the mode purity and cavity Q for the desired operating mode (TE11). The use of Hamming and Kaiser-Muller k-space filters allow the design of Bragg resonators with substantially improved mode properties. The improved design will be described, and simulations of the CARM oscillator operation will be presented.