120396510
Scintillation fiber hodoscope for topological triggering
A fast and precise scintillating fiber (SciFi) hodoscope based on KURARAY SciFi and HAMAMATSU multianode H6568 tubes was constructed to be used in DIRAC experiment (PS-212) at CERN for tracking and topological triggering information. The front-end electronics was custom developed to allow on-line discrimination after built-in dynamic cross-talk rejection. Preliminary tests of the detector using more than 300 read-out channels have shown an excellent stability and optimum performance for this system: a uniform detection efficiency of 98%, a 125 μm single hit and ∼0.5 mm two-hit space resolution, 0.6 ns time resolution.
120287769
Longitudinally polarized electrons in a storage ring below 1 GeV
We report on the results of studies of the longitudinal electron polarization in the AmPS storage ring at NIKHEF. The ring was operated using a partial Siberian snake at the first magic energy, and a full Siberian snake between 440 MeV and 720 MeV. We have investigated the effect of high beam currents in the ring, and found that some of the electron polarization is lost if the beam current becomes larger than ≈120 mA.
118445517
Search for Narrow Resonances in $\pi^- p$ Large Angle Elastic Scattering and in $\pi^- p$ Total Cross-section
125673698
Determination of the Luminosity at the LHC Experiments
103525244
Quasielastic electron scattering from polarized He-3.
122910362
Performance of a Polarized Deuterium Internal Target in a Medium-Energy Electron Storage Ring.
Abstract A polarized deuterium target internal to a medium-energy electron storage ring is described in the context of spin-dependent (e,e′d) and (e,e′p) experiments. Tensor polarized deuterium was produced in an atomic beam source and injected into a storage cell target. A Breit-Rabi polarimeter was used to monitor the injected atomic beam polarization. An electrostatic ion-extraction system and a Wien filter were utilized to measure on-line the atomic fraction of the target gas (71 ± 2%) in the storage cell. A target thickness t ⋍ 2 × 10 13 2 H/cm 2 was achieved. The target tensor polarization was varied from P zz + = 0.49(3) to P zz − = −0.89(6) while keeping the vector polarization P z at zero. The luminosity was ∼ 2 × 10 31 e − · 2 H · cm −2 s −1 at a beam current of 120 mA. The performance was stable over a fiv running period. A large acceptance non-magnetic detector system was used for the electron-proton (deuteron) coincidence measurement. It is demonstrated that these techniques result in low backgrounds due to scattering from species other than the polarized target gas and allow for fast and flexible orientation of the target spin. Specific issues such as interfacing the experiment to the storage ring and monitoring the performance of the target system are discussed in detail.
122010968
LUMINOSITY MONITORING AT LHCb
121605096
Performance of an irradiated LHCb prototype p-on-n silicon microstrip detector
Abstract A prototype silicon detector for the LHCb experiment has been irradiated non-uniformly with fluences of up to 10 15 p / cm 2 of 24 GeV protons and tested with LHC speed electronics in a test beam. After doses equivalent to one year of operation at the LHC, the detector was operational, and deteriorated after higher doses. The performance of this detector identifies particular risks associated with a p-on-n fine pitch design with a double metal layer.
109046686
Beam incidents - High particle rate tests of an LHCb/Velo silicon strip module
L. Eklund ∗a, K. Akiba b, O. Behrendt c, M. van Beuzekom b, J. Buytaert c, P. Collins c, M. Ferro-Luzzi c, K. Hennessy d, J. Imong e aUniversity of Glasgow, Glasgow, UK. bNikhef, National Institute for Subatomic Physics, Amsterdam, Netherlands. cEuropean Organisation for Nuclear Research (CERN), Geneva, Switzerland. dUniversity of Liverpool, Liverpool, UK eH.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom. E-mail: Lars.Eklund@cern.ch