SOFT X-RAY REFLECTORS WHICH ARE TRANSPARENT TO HARDER UGT X-RAYS

ON A HORIZONTAL LINE-OF-SIGHT UNDERGROUND NUCLEAR TEST (UGT), THE MAXIMUM AREA FOR EXPERIMENTS TO BE EXPOSED TO DIRECT SHINE FROM THE WORKING POINT IS THE STUB PLATE AREA. USUALLY, THE REQUESTS FOR EXPOSURE AREA ARE GREATER THAN THE AVAILABLE AREA. EXPERIMENTS INVOLVING SOFT X-RAYS HAVE TO BE PLACED IN A DIRECT LINE OF SIGHT BECAUSE SOFT X-RAYS SCATTER POORLY AND SOMETIMES HIGHER FLUENCES ARE REQUESTED THAN CAN BE PROVIDED BY SCATTERING. LARGE SCATTERS ARE AVAILABLE FOR HARDER X-RAYS WHICH UTILIZE LARGE AREA LOW-Z SCATTERS. THESE SCATTERERS EFFECTIVELY SHADOW LARGE AREAS FROM SOFT X-RAYS SO THEY REDUCE THE AREA AVAILABLE FOR SOFT X-RAY EXPERIEMENTS. WE PROPOSE TO USE THE AREA IN FRONT OF THE HARD X-RAY SCATTERER TO DEPLOY A SOFT X-RAY REFLECTOR CONCENTRATOR WHICH WILL REFLECT SOFT X-RAYS INTO AN ALCOVE FOR EXPERIMENTS. THIS REFLECTOR WILL BE ESSENTIALLY TRANSPARENT TO HARD X-RAYS WHICH WILL PASS THROUGH TO THE SCATTERER BUT WILL PROVIDE HIGH REFLECTIVITY FOR SELECTED SOFT X-RAY ENERGIES. THIS WILL ALLOW AN EXPERIMENTER TO CUSTOM TAILOR HIS SOFT X-RAY SPECTRA WITHOUT INTERFERENCE FROM OTHER RADIATION AND WITHOUT USING VALUABLE EXPOSURE AREA.