Over the last four decades Ren-Yuan Zhu and his colleagues have been involved in the development of inorganic scintillators for
precision crystal electromagnetic calorimeters in high energy physics, such as the L3 BGO, BaBar CsI(Tl), CMS PWO and Mu2e CsI.
This effort received several Advanced Detector Research award and Collider Detector Research and Development award from
the DOE Science Office for developing PWO, LSO/LYSO and cost-effective crystals for future HEP experiments. Starting 2009,
Ren-Yuan has been leading an Advanced Detectosr Research and Development task in the Caltech HEP program with a goal to
develop inorganic scintillator-based novel detector concepts, such as an ultracompact, fast and radiation resistant
calorimeter concept, an ultrafast calorimeter concept, and a cost-effective homogeneous hadronic calorimeter concept.
Emphasis of this program is to develop novel inorganic scintillators, such as LYSO:Ce crystals and LuAG:Ce ceramics
featured with excellent radiation resistance, yttrium doped-barium fluoride crystals and other ultrafast scintillators featured
with sub-ns decay time and suppressed slow scintillation, and cost-effective crystals and glasses for the homogeneous
hadronic calorimeter concept. This effort is supported by the U.S. Department of Energy, Office of High Energy Physics
program under Award Number DE-SC0011925.