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Two photon annihilation processes were observed with the TASSO detector at the e+e- storage ring PETRA. We report on the analyses of untagged and single tag events. We select untagged events with a two prong final state seen in the central detector and compare these data to the prediction for two photon QED processes. We observe an excess of events in the expected invariant mass range for the...
Appropriate and efficient termination of transcription by the RNA polymerases I, II and III (Pol I, II, and III) is desirable for several reasons: while energy conservation and the avoidance of producing unwanted transcripts in the nucleus may be a significant issue, other factors are also important. Differences in the timing and levels of production of transcripts are large: Pol I and III transcribe...
The Fast TracKer (FTK) to Level-2 Interface Card (FLIC) of the ATLAS FTK trigger upgrade is the final component in the FTK chain of custom electronics to connect the system to the High-Level trigger (HLT). The FTK performs full event tracking using the ATLAS Silicon detectors for every Level-1(L1) accepted event at 100 kHz. The FLIC is a custom Advanced Telecommunications Architecture (ATCA) card...
We present a study of Single Event Upsets (SEU) performed on a commercial pulse-width modulator controller chip for switching power supplies. We performed tests to study the probability of an SEU occurring as a function of incident particle (hadron) energy. We discuss the performance of the circuit, and present a solution using external circuitry to effectively eliminate the effect.
We present a reliability study on a new low voltage power supply design for the front-end electronics of the ATLAS Tile Calorimeter. Using the reliability data from the manufacturers of the components, we derive an estimate of the expected number of failures per year during the normal operating lifetime of the power supply bricks. This may be useful for other power supply designs or front-end electronics...
We present the design of an upgraded switching power supply brick for the front-end electronics of the ATLAS hadron tile calorimeter (TileCAL) at the LHC. The new design features significant improvement in noise, improved fault detection, and generally a more robust design, while retaining the compact size, water-cooling, output control, and monitoring features in this 300 KHz design. We discuss the...
As the LHC luminosity is ramped up to 3×1034 cm-2 s-1 and beyond, the high rates, multiplicities, and energies of particles seen by the detectors will pose a unique challenge. Only a tiny fraction of the produced collisions can be stored on tape and immense real-time data reduction is needed. An effective trigger system must maintain high trigger efficiencies for the physics we are most interested...
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