The Neutron Ion Multi-detector for Reaction Oriented Dynamics (NIMROD) was commissioned in the mid 1990s. The forward angles (3.6-45°) of the array was modeled after INDRA at GANIL. Originally, the back segment consisted of the CsI Ball, which was part of the ORNL HiLi array. The first experiment was performed in December 1999. After the Indiana University decommissioned the Indiana Silicon Sphere (ISiS), one half of the array was brought to Texas A&M University and became the new back-half of NIMROD. The new array allowed for better granularity.
In 2007, NIMROD was refurbished (Campaign II). The new upgrade included the removal of the ionization chambers, and the addition of two supertelescopes in Rings 2/3, 4/5, 6/7 and 8/9. ISiS was installed and an additional set of rings (Ring 10/11) was added. New zeptosystem preamplifiers were added allowing for greater particle identification. This also required new motherboards. In 2008, Si detectors were added to Ring 10/11.
In 2018, NIMROD went through another upgrade (Campaign III). The new upgrade included more supertelescopes for a total of 6 in Ring 2/3, 4 in Ring 4/5 and 6/7, and 2 in Ring 8/9 (same as previous). The electrics were also upgraded. Previous experiments used the WUSTL Pico-shapers for the Si detector signals. QDCs were used for the CsI signals. Signals were housed in racks located on high-bay. The Si front signals are now analyzed using the Multiplexed Analog Shaping Electronics (MASE) borrowed from Dr. R. deSouza at IU. Flash digitizers are used to analyze the Si back and CsI signals.
Relevant Campaign I information:
Mixed Source (228Th, 244Cm, 241Am, 239Pu, 148Ge) Spectrum
Index of Pictures Taken 26-Aug-1999
Index of Pictures Taken 19-Aug-1999
Index of Pictures Taken 26-April-1999
Data Taken From Various Test Runs
Pictures of Original Prototypes