Simulation of the GRETINA Scanning Table at Lawrence Berkeley National Laboratory

Submission Date


Document Type



Physics & Astronomy

Faculty Mentor

Lew Riley


Presented during the 17th Annual Summer Fellows Symposium, July 24, 2015 at Ursinus College.

Supported by a National Science Foundation Research at Undergraduate Institutions (NSF RUI) grant (PHY-1303480).

Project Description

We developed a geant4 simulation of the GRETINA scanning table at Lawrence Berkeley National Laboratory. The GRETINA gamma-ray tracking array consists of 28 highly segmented coaxial germanium crystals. Each of the crystals is segmented into 36 electrically isolated ele- ments. The scanning table is primarily used to determine how GRETINA records the information pertaining to the position of a gamma-ray hit. Since the gamma-ray source is collimated, events are produced at known locations. Then the data are analyzed to determine a process of turning raw data into useful positions. The data can also be analyzed to better understand aspects of GRETINA like its geometry, resolution, efficiency, and the effects of various parts on gamma ray detection. Complex components of the scanning table were implemented in the simulation using STL files created from CAD drawings which were imported to the code using the open source package CADMesh.

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