7,022 Works

Interpretation of delayed neutron emission using a non-statistical approach

A A Shihab-Eldin, W Halverson, S G Prussin & F M Nuh
Experimental data on several delayed neutron emitting systems exhibit characteristics not accounted for by the normal statistical model. Using a single-particle approach, the locations and relative beta - strengths to configurations in the emitter nuclides populated by allowed G.T. transitions have been calculated and are in qualitative agreement with strength function data for /sup 85/As, /sup 87/Br, /sup 135/Sb and /sup 137/I. Calculations of P/sub n/-values for the bromine precursors A=87 to 92 are also...

ATLAS TDAQ Integration and Commissioning

J Zhang
The ATLAS detector will be exposed to proton proton collision at the center of mass energy of 14 TeV with the bunch crossing rate of 40 MHz. In order to reduce this rate down to the level at which only interesting events will be fully reconstructed, a three-level trigger system has been designed. The level 1 trigger reduces the rate down to 75 kHz via the custom-built electronics. The Region of Interest Builder delivers the...

The ALICE Central Trigger Processor

L Sándor, P Jovanovic, D Evans, J Urbán, R Lietava, S Fedor, I Králik, A Jusko, G T Jones & O Villalobos Baillie

Detection of coherent beam-beam modes with digitized beam position monitor signals

G Stancari, S M White & A Valishev
A system for bunch-by-bunch detection of transverse proton and antiproton coherent oscillations in the Fermilab Tevatron collider is described. It is based on the signal from a single beam-position monitor located in a region of the ring with large amplitude functions. The signal is digitized over a large number of turns and Fourier-analyzed offline with a dedicated algorithm. To enhance the signal, band-limited noise is applied to the beam for about 1 s. This excitation...

Level scheme of /sup 131/Sb

Kris L G Heyde, B Pfeiffer, K Sistemich, K Kawade, J Sau, J A Pinston, F Schussler, H Lawin, J Blachot & E Monnand
Level scheme of /sup 131/Sb is studied from an examination of gamma transitions. These results are compared with refined one-proton- particle two-neutron-hole shell model calculations with two different proton-neutron residual interactions. (9 refs).

Achieving Best Performance with VME-based Data Acquisition Systems and 2eSST

A Aloisio, R Giordano, L Capasso & V Izzo
fastest block transfer cycle offered by the VME64x standard. The maximum achievable data-rate foreseen by the protocol is 320 MByte/s. In this paper we present a reference design based on a FPGA, for the reader willing to implement 2eSST in his VME64x application. By using this template, we have designed a custom Bit Error Rate Tester, in order to probe the block transfer reliability within and beyond the data rate limit presently set by the...

What needs to be done to reach beam energy above 3.5 TeV? Commissioning of essential magnet powering and machine protection systems

N Catalan Lasheras
After the initial plans in 2007 to run the LHC at 7 TeV, a number of unexpected events, and the extended knowledge of the machine that came after them, have convinced us to gradually reduce the beam energy to the current 3.5 TeV. As a consequence of this, some circuits have been commissioned to different energy levels. Some systems, as the quench protection system, are working at a reduced level of accuracy based on less...

Performance of CMS ECAL Very Front End Electronics

Alessandro Nardulli, W Lustermann, A Economou, J Fay, C Combaret, M Dröge, M Obertino, N Cartiglia, L Djambazov & J Blaha
We report the results of tests of 12880 Very Front End (VFE) readout cards for the barrel of the CMS electromagnetic calorimeter. A thorough test sequence was applied to each card including power-on test, burn-in and final calibration. Cards failing the tests were at the few per mille level. The results prove the very high quality of the VFE cards.

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  • 2014
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  • CERN Publishing
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