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At least 73 records · Page 4Linked to original sources

arXiv2008

Design of a Nanometer Beam Size Monitor for ATF2

We developed an electron beam size monitor for extremely small beam sizes. It uses a laser interference fringe for a scattering target with the electron beam. Our target performance is < 2 nm systematic error for 37 nm beam size and < 10% statistical error in a measurement using 90 electron bunches for 25 - 6000 nm beam size. A precise laser interference fringe control system using an active feedback function is incorporated to the monitor to achieve the target performance. We describe an overall design, implementations, and performance estimations of the monitor.

physics.ins-det↗

arXiv2008

The Liquid Argon Jet Trigger of the H1 Experiment at HERA

The Liquid Argon Jet Trigger, installed in the H1 experiment at HERA, implements in 800 ns a real-time cluster algorithm by finding local energy maxima, summing their immediate neighbors, sorting the resulting "jets" by energy, and applying topological conditions. It operated since the year 2006 and drastically reduced the thresholds for triggering on electrons and jets.

physics.ins-det↗

arXiv2017

Design of a multichannel 127 degree cylindrical spectrometer for sputtered ions

Design details of a 127 degree electrostatic cylindrical spectrometer equipped with a position-sensitive micro-channel plate detector for measuring the sputtered ions in collisions of highly charged ions with solid surface is described. The nonlinear relationship between the point of fall versus the ionic energy, the blurring of the point of fall caused by the divergence of incident angle and the finite entrance aperture, the transform from a position spectrum to an energy spectrum, as well as the influence of the fringing fields are discussed.

physics.ins-det↗

arXiv2008

Simulation Study of the Beam Calorimeter in the GLD Configuration for the Next Generation Linear Collider

The beam calorimeter, located in the very forward and backward region of the next generation electron-positron linear accelerator, will be an important apparatus to search for or identify new particles beyond Standard Model. One of its key design issues is to estimate the radiation dosage due to beam related backgrounds. We used the geant-based package, Jupiter, for the proposed GLD detector in this study. The dosage received per year for the inner most ring will be around 10 Mrad. An algorithm for electron identification with beam calorimeter under nominal background condition is developed and is used for the feasibility study of smuon search. The result is satisfactory.

physics.ins-det↗

arXiv2008

Measurements and Analysis of Beam Transfer Functions in the Fermilab Recycler Ring Using the Transverse Digital Damper System

The primary purpose of the Fermilab Recycler Ring Transverse Digital Damper System is to prevent instabilities due to high phase space densities of the cooled antiproton beam. The system was designed to facilitate Beam Transfer Function measurements using a signal analyzer connected to auxiliary system ports for timing and diagnostic purposes. The Digital Damper System has the capability for both open and closed loop measurements. The Beam Transfer Function provides direct measurement of the machine impedance, and beam and lattice parameters such as betatron tune and chromaticity. An overview of the technique is presented along with analysis and results from open and closed loop measurements in the Fermilab Recycler Ring.

physics.acc-ph↗

arXiv2008

AGATA: Gamma-ray tracking in segmented HPGe detectors

The next generation of radioactive ion beam facilities, which will give experimental access to many exotic nuclei, are presently being developed. At the same time the next generation of high resolution gamma-ray spectrometers, based on gamma-ray tracking, for studying the structure of these exotic nuclei are being developed. One of the main differences in tracking of $γ$ rays versus charged particles is that the gamma rays do not deposit their energy "continuously" in the detector, but in a few discrete steps. Also, in the field of nuclear spectroscopy, the location of the source is mostly well known while the exact interaction position in the detector is the unknown quantity. This makes the challenges of gamma-ray tracking in germanium somewhat different compared to vertexing in silicon detectors. In these proceedings we present the methods for determining the 3D interaction positions in the detector and how these are used to reconstruct the gamma-ray tracks in the AGATA detector array. We also present preliminary simulation results of a proposed in-beam method to measure the interaction position resolution in the germanium detectors.

nucl-ex↗

arXiv2008

Experience with CMS pixel software commissioning

The CMS Pixel detector, consisting of three barrel layers and two endcap disks at each barrel end, was installed in the CMS experiment in summer 2008. After a preliminary commissioning phase with pulse injections the detector participated to data taking with cosmic ray trigger and 3.8T field. In this article, we describe the software for event reconstruction, as well as the status of the calibration tools. In addition, we report on the first running experience with CMS and present preliminary results on detector performance.

physics.ins-det↗

arXiv2008

Energy reconstruction of electromagnetic showers from $π^0$ decays with the ICARUS T600 Liquid Argon TPC

We discuss the ICARUS T600 detector capabilities in electromagnetic shower reconstruction through the analysis of a sample of 212 events, coming from the 2001 Pavia surface test run, of hadronic interactions leading to the production of $π^{0}$ mesons. Methods of shower energy and shower direction measurements were developed and the invariant mass of the photon pairs was reconstructed. The ($γ$,$γ$) invariant mass was found to be consistent with the value of the $π^0$ mass. The resolution of the reconstructed $π^0$ mass was found to be equal to 27.3%. An improved analysis, carried out in order to clean the full event sample from the events measured in the crowded environment, mostly due to the trigger conditions, gave a $π^0$ mass resolution of 16.1%, significantly better than the one evaluated for the full event sample. The trigger requirement of the coincidence of at least four photomultiplier signals favored the selection of events with a strong pile up of cosmic ray tracks and interactions. Hence a number of candidate $π^0$ events were heavily contaminated by other tracks and had to be rejected. Monte Carlo simulations of events with $π^0$ production in hadronic and neutrino interactions confirmed the validity of the shower energy and shower direction reconstruction methods applied to the real data.

hep-ex↗

arXiv2009

Study of the Radiation Hardness of Vcsel and Pin Arrays

The silicon trackers of the ATLAS experiment at LHC (CERN) use optical links for data transmission. VCSEL arrays operating at 850 nm are used to transmit optical signals while PIN arrays are used to convert the optical signals into electrical signals. We investigate the feasibility of using the devices at the Super LHC (SLHC). We irradiated VCSEL and GaAs PIN arrays from three vendors and silicon PIN arrays from one vendor. All arrays can be operated up to the SLHC dosage except the GaAs PIN arrays which have very low responsivities after irradiation and hence are probably not suitable for the SLHC application.

physics.ins-det↗

arXiv2009

Energy harvesting by utilization of nanohelices

An energy harvesting device based on nanohelices is presented. The energy harvesting scheme based on nanohelices involves the same rectification circuitry found in many household electronic goods, which converts alternating current (AC) from a wall outlet into a direct current (DC) supply. The presented device, however, involves the rectification of ambient electromagnetic waves rather than the AC source from a household wall outlet.

physics.optics↗

arXiv2009

Linearized SQUID Array (LISA) for High Bandwidth Frequency-Domain Readout Multiplexing

We have designed and demonstrated a Superconducting Quantum Interference Device (SQUID) array linearized with cryogenic feedback. To achieve the necessary loop gain a 300 element series array SQUID is constructed from three monolithic 100-element series arrays. A feedback resistor completes the loop from the SQUID output to the input coil. The short feedback path of this Linearized SQUID Array (LISA) allows for a substantially larger flux-locked loop bandwidth as compared to a SQUID flux-locked loop that includes a room temperature amplifier. The bandwidth, linearity, noise performance, and dynamic range of the LISA are sufficient for its use in our target application: the multiplexed readout of transition-edge sensor bolometers.

astro-ph.IM↗

arXiv2009

Beam Size Measurement with Pair Monitor and BeamCal

At the International Linear Collider (ILC), measurement of the beam profile at the interaction point (IP) is a key issue to achieve high luminosity. We studied the beam size measurement by combination of Pair Monitor and BeamCal. We obtained measurement accuracies of 2.7%, and 6.6% for the horizontal, and vertical beam sizes, respectively, for 50 bunch crossings.

physics.ins-det↗

arXiv2009

Resolution Studies on Silicon Strip Sensors with fine Pitch

In June 2008 single-sided silicon strip sensors with 50 $μ$m readout pitch were tested in a highly energetic pion beam at the SPS at CERN. The purpose of the test was to evaluate characteristic detector properties by varying the strip width and the number of intermediate strips. The experimental setup and first results for the spatial resolution are discussed.

physics.ins-det↗

arXiv2009

Background Studies for the VTX Geometry Optimisation

Influence of Vertex Detector (VTX) geometry on jet flavour tagging performance was studied in presence of e+e- pair background from beamstrahlung in the International Linear Collider (ILC). Five layer "long-barrel" VTX geometry with varying layer thickness, space resolution and radius of the first layer was tested with fast simulation tools. Influence of VTX geometry and e+e- pair background on measurement of SM and MSSM Higgs boson branching ratios was also studied.

physics.ins-det↗

arXiv2009

Development of an IMS Type Device for Volatile Organic Compunds Detection: Simulation and Comparision of the Ion Distributions

Ion Mobility Spectrometry (IMS) is a well-known, sensitive and rapid technique to detect dangerous organic compounds. We propose a system in which a crown type discharge generates a ionic flow that is swept towards an array of collectors by a transverse electric field. The ions are separated as they enter the cell according to their mobility. Thus, the distribution of the charge deposited at the detector assembly constitutes a {\em fingerprint} for each organic compound. Simulations of our cell and experiments were performed for small amounts of acetone, ethanol and toluene. The dependence on the cell parameters of the current and charge versus time of flight was analyzed. Our simulation reproduces only qualitatively the experimental results. However, a PCA statistical analysis of the results obtained by simulation of the proposed design shows that the fingerprint is useful for a clear identification of such compounds.

physics.ins-det↗

arXiv2009

Identification of Bacteria by Patterns Generated from Odor Spectra

We use the power density spectra obtained by fluctuation-enhanced sensing of bacterial odors (Escherichia coli and Anthrax-surrogate Bacillus subtilis) to generate new, highly distinguishable, types of patterns based on the average slope of the spectra in different frequency ranges. Such plots can be considered as "fingerprints" of bacterial odors. Three different ways of pattern generation are tested, including a simple binary version. The obtained patterns are simple enough to identify the situation by the naked eye without a pattern recognizer.

physics.gen-ph↗

arXiv2009

Track Segments in Hadronic Showers: Calibration Possibilities for a Highly Granular HCAL

The CALICE collaboration has constructed a highly granular hadronic calorimeter based on small scintillator tiles read out with silicon photomultipliers. With this detector, data was taken at CERN and at Fermilab. The high granularity of the detector allows the identification of minimum-ionizing track segments within hadronic showers, demonstrating the imaging capabilities of particle flow calorimeters. These tracks can be used for the cell-by-cell calibration of such a calorimeter. The possibility to calibrate a complete ILC calorimeter with such track segments in the absence of muons is also investigated.

physics.ins-det↗

arXiv2009

Integral equation for source of ionization in hollow cathode

To simulate the influence of pendulum effect in hollow cathode configuration on a current-voltage characteristic it is proposed to consider a plane glow discharge in one-dimensional space configuration with two plane parallel cathodes and one plane anode in the middle. A pendulum effect could be switched on or off, with consideration for the anode to be transparent or not for fast ionizing electrons. On the basis of a stationary kinetic equation for ionizing electrons an integral equation for a source of ionization is derived. This equation can be used as a component in self-consistent problem for field equations to calculate a current-voltage characteristic and to show how it changes in both cases - in presence or absence of anode transparency.

physics.plasm-ph↗