The central feature of the CMS Link alignment system is a network of Amorphous Silicon Position Detectors distributed throughout the muon spectrometer that are connected by multiple laser lines. The ...data collected during the years from 2008 to 2015 is presented confirming an outstanding performance of the photo sensors during more than seven years of operation. Details of the photo sensor readout of the laser signals are presented. The mechanical motions of the CMS detector are monitored using these photosensors and good agreement with distance sensors is obtained.
Magnet Cycles and Stability Periods of the CMS Experiment are studied with the Alignment Link System data recorded along the 2008–2013 years of operation. The motions of the mechanical structures due ...to the magnetic field forces are studied and the mechanical stability of the detector during the physics data taking periods is verified.
The effect of irradiation on the optical absorption edge and thickness of AsSe and As2S3 thin films has been investigated for different doses of 12H, 11H accelerated to energies of 80 and 180 keV. ...The kinetics and value of the stimulated changes were compared with photo-induced effects of laser illumination at 0.51 and 0.63 mm. The optical band gap decreases and the thickness increases for both cases. The penetration length and depth profile of implanted ions with different energies were calculated and proposed for creating layer structures with depth-profiled optical parameters. 14 refs.
Considering the importance of the X-ray production cross sections for the determination of the element concentrations in a given material, we have measured them experimentally for Al Si, Sc, Ti, V, ...Fe, Co, Ni and Cu bombarded by protons with energies ranging from 40 to 180 keV.
This document presents an overview of the induced photocurrents in the Amorphous Silicon Position Detectors used in the network of diode lasers and photo sensors of the CMS Link alignment system ...recorded during its eleven years of operation. After a description of the sensors characteristics, the layout of the sensors network is discussed. The sensors are distributed throughout the muon spectrometer and connected by laser lines. The data used correspond to readout information obtained during some of the physics runs from 2008 to 2018.
PMMA melting under proton beam exposure Szilasi, S.Z.; Baradács, E.; Daruka, I. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
April 2005, 2005-04-00, Letnik:
231, Številka:
1-4
Journal Article
Recenzirano
Experiments on 50μm thin PMMA sheets have been performed using a homogeneous 2MeV proton beam of 5mm diameter. The irradiations have been carried out at the Debrecen nuclear microprobe facility. For ...the characterization of the samples DIC microscopy and Twyman–Green interferometry have been used. It was found that the samples melted at a beam intensity dependent critical dose. Numerical calculations including heat transport and heat radiation corroborated the experimental results.
A study of the time required for the CMS detector to reach structural equilibrium once the magnetic field is ramped to its operational value of 3.8T is presented. In addition, the results from a ...stability monitoring at 3.8T over an eight-month period are given.
Between 1993 and 1996 a new 14.5 GHz electron cyclotron resonance (ECR) ion source was designed and built at ATOMKI for atomic and plasma physics research. In 1996 the assembling of the ion source ...has been finished and the first plasma diagnostic (visible and X-ray) measurements were carried out. In this work we started an investigation of the spectral distribution of the visible range of the electromagnetic spectrum. We studied the change of relative line intensities and the Xe2 to Xe1 ratio depending on the pressure inside the plasma. We were able to find spectral lines of Xe2 which are good candidates for plasma diagnostic tools in future investigations.
This document describes results obtained from the Link alignment system data recorded during the Compact Muon Solenoid (CMS) Magnet Test. A brief description of the system is followed by a discussion ...of the detected relative displacements (from micrometres to centimetres) between detector elements and rotations of detector structures (from microradians to milliradians). Observed displacements are studied as functions of the magnetic field intensity. In addition, the reconstructed positions of active element sensors are compared to their positions as measured by photogrammetry and the reconstructed motions due to the magnetic field strength are described.
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