Final answer:
The ASR-11 terminology does not align with the options provided, and in physics, alpha radiation consists of helium nuclei without references to a specific beam. The correct magnetic field application is perpendicular to the particle velocity, and the traversal time depends on the particle's path and velocity.
Step-by-step explanation:
The ASR-11 system, otherwise known as the Airport Surveillance Radar, does not use terminology such as Alpha Beam, Echo Beam, Delta Beam, or Gamma Beam for its normal radiation beam. However, in the context of physics, specifically when dealing with a research group investigating short-lived radioactive isotopes, the main beam they would use for transporting alpha particles would be a directed beam created using magnetic and electric fields, not categorized as any of the options you've provided. The normal radiation for an alpha particle is not referred to as a beam but as alpha radiation which consists of helium nuclei (He).
Regarding the design to transport alpha particles: (a) The magnetic field should be applied perpendicular to the velocity of the alpha particles to create a circular path due to the Lorentz force acting on the charged particles. (b) The time it takes for the alpha particles to traverse the magnetic field area can be calculated using the radius of the circular path and the velocity of the alpha particles.