NIMROD
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The Demon neutron detectors above NIMROD. |
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NIMROD, the Neutron and Ion Multidetector for Reaction Oriented Dynamics. |
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Diagram of NIMROD. NIMROD has a 4 pi detector array surrounded by a tank of scintillator fluid for detecting neutrons. |
NIMROD-ISiS
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An example of a NIMROD telescope. This configuration is refered to as a super telescope as it has two Si detectors rather than just one. A major portion of the NIMROD upgrade was the completion of the Si coverage throughout the detector. |
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The schematic diagram of NIMROD-ISiS inside the Neutron Ball |
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This picture shows the forward interior of NIMROD-ISiS. You are looking at the CsI crystals wrapped in aluminized mylar. Notice the annular symmetry of the detectors. Also, there is an ion-chamber installed in Ring 4-5. |
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Ring 10-11 was added during the upgrade to mate the NIMROD forward angle ring 9 to the ISiS hemisphere. This addition also highly increased the granularity in this region. Notice the target ladder rails passing through the center. |
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Half of the ISiS array forms the backward hemiphere of NIMROD-ISiS. |
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The ISiS chamber is a complex bit of engineering. Notice the three rows of signal feedthroughs. They follow a pattern. The forward most (lowest) row is for the eventual ion chamber signals. The middle row is Si signals. The back row (highest) is photo diode signals. |
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This is the hand valve below Bertha – the largest turbo pump on NIMROD-ISiS. The note referrs to closing off Tiny ( the huge oil roughing pump) before opening the valve. This is important as Bertha can suck the oil out of Tiny into the detector array. |
Assembling the cabling on NIMROD-ISiS
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Cabling the array is a challenge (esp. for a new comer) Notice the motherboards and HV supplies for the PMTs. |
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Keeping the cables flat as they pass from the motherboards towards the electronics is very important or else they will rub on the Neutron Ball. This often unplugs either the cables or the motherboards. |
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The patch panel. The flat ribbon cables come to the back of this and the signals are passed out to their respective analysing electronics from here. This greatly simplifies debugging signals. |
Data
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The three (currently) possible sources of information about charged particles in the NIMROD-ISiS array: CsI Fast-Slow, Si-CsI, Si-Si |