Experience with medium-size SRS for muon tomography Michael Staib Florida Institute of Technology.

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Kondo GNANVO Florida Institute of Technology, Melbourne FL.

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Presentation transcript:

Experience with medium-size SRS for muon tomography Michael Staib Florida Institute of Technology

Muon Tomography at Florida Tech Eight 30 cm x 30 cm triple-GEM detectors enclosing an active area of ~ 1 ft 3 Detector design similar to COMPASS GEMs: 3/2/2/2 mm gap configuration Cartesian XY readout strips with 400 µm pitch 1,536 readout channels per detector 2 Muon Tomography Concept Main idea: Multiple scattering is proportional to Z and the density of the material, allowing detection of nuclear contraband by measuring scattering of cosmic ray muons.

SRS for Muon Tomography Current station configuration with 8 detectors: 96 APV Hybrid (48 M/S pairs) 6 ADC/FEC cards 2 Gigabit network switches Six 25 ns frames of data recorded for each APV per trigger yields event size of 30 Hz. DATE for data acquisition. AMORE for data decoding, event monitoring and data analysis. 3

Muon Tomography at Florida Tech 4 Detector Characterization Point of Closest Approach (POCA) Reconstruction Note: Preliminary detector alignment Ta Pb Fe U WPb Fe Sn

5 NetworkingHDMI Cables Low-cost network switches are unable to support many FECs. 2 x Netgear JGS port switches currently used and can support a maximum of 4 FECs each. Issue not well understood. Problem with HDMI channel mapping on APV hybrid identified. All HDMI cables are not the same! Inexpensive cables can be used, but it is important to test if they work with the system. Some Minor Problems

6 Several data sets show some inconsistencies in the quality of the data. These data sets show anomalous station acceptance, and improper tracking information. The corruption of data can start randomly in the middle of a data set. This could be caused by one of the FECs missing a trigger. Several checks have been implemented in the firmware, but they are not perfect. Desychronization of FEC clocks makes it difficult to detect this problem reliably. For now we limit each run to 100k events to minimize the effect of bad data. Missing Triggers?

Summary and Outlook We have successfully used the SRS to record data from eight 30 cm x 30 cm GEMs and processed this data to produce tomographic images of several high-Z scenarios. SRS operation is stable for ~12k channel system, with a few caveats: Missing triggers (or packets) occasionally corrupt data Networking issue needs to be better understood Zero suppression at the hardware level becomes very important for medium/large scale systems. We are very interested in testing zero suppression on the FPGA. Clock/trigger fan-out unit may help with problem of corrupted data. 7