  The paper presents the design and qualification tests of an airborne
experimental setup to determine cosmic ray-flux in the lower stratospheric
regions of the earth's atmosphere. The concept of coincidence is implemented to
preferentially detect cosmic rays and reject noise and particles that are
incident at large angles but otherwise have similar characteristics, and are
therefore inseparable from the particles of interest by conventional detection
techniques. The experiment is designed to measure cosmic ray flux at two
altitudes extending to a maximum height of 30 km from mean-sea-level. The
experimental setup is to be lifted using a High Altitude Balloon (HAB). The
setup is designed and tested to withstand extreme temperature and pressure
conditions during the flight in the stratosphere. It includes a cosmic ray
telescope, a data acquisition system, a power supply systems, and peripheral
sensors. In the present endeavor, the payload design and results from
qualification tests are included.
