MPGD 2013 & 11th RD51 collaboration meeting

Session

Monday (poster session )

1 Jul 2013, 16:45

Paraninfo buidling, Zaragoza, Spain

53. A Micromegas detector for 222Rn emanations measurements

Juan Antonio Garcia Pascual (Facultad de Ciencias-Universidad de Zaragoza)

01/07/2013, 16:45

The 222Rn emanation has significant contribution in the overall background for rare event searches experiment, in order to measure this emanations a high sensitivity detector have been designed with the aim of a minimum detectable activity of 100 μBq. The detection method is the electrostatic collection of the 222Rn daughters on a Micromegas detector. Using a chamber with a volume of 21.2 l...

54. A successful application of thinner‐THGEMs

Liu Qian (UCAS)

01/07/2013, 16:45

The thinner-THGEMs (Thick Gas Electron Multipliers), typically with 0.2mm thickness, 0.2mm hole diameter, 0.7mm pitch and a narrow (5~20μm) rim, represent a promising option for a parallax-free curved gas detector with relative high spatial resolution and large dynamic range of gain. In this paper we report the study of thinner-THGEMs that have been developed by UCAS (university of Chinese...

37. Application of 2D‐GEM with Strip Readout in Synchrotron Radiation

Jianrong Zhou

01/07/2013, 16:45

With the faster time data acquisition system and micro-structure GEM gaseous detector, the two-dimensional position sensitive X-ray detection system based 704 electronic channels has developed in Institute of High Energy Physics in the past few years. There were 267 readout strips of 0.l93mm width and the pitch of strips was 0.752mm in X direction. In Y direction, there were 437 readout...

52. Beam Tracking with Micromegas & Wire Chambers in Secondary Electron Detection Configuration

Begoña Fernandez (CNA-University of Seville)

01/07/2013, 16:45

For nuclei identification purposes at the focal plane of S3, new experimental area of SPIRAL2 at GANIL, it is necessary to reconstruct the trajectories of the nuclei. Classical tracking detectors in beam would generate a lot of angular and energy straggling due to their thickness. One solution could be the use of Se-D (Secondary electron Detection). It consists of only a thin emissive foil in...

51. Development of GEM gas detectors for X‐ray crystal spectrometry

Marina Chernyshova

01/07/2013, 16:45

The high-resolution X-ray spectroscopy is a powerful tool for diagnosing the properties of tokamak plasmas. The Bragg crystal X-ray spectroscopy has become well-established technique for diagnosing important plasma parameters. The characteristic X-ray radiation emitted by highly ionized metal impurities provides accurate information on the crucial plasma parameters such as impurity...

40. Gain Uniformity tests on full scale triple GEM detectors for CMS high Eta upgrade

Christopher Armaingaud (Institut de Physique et Chimie des Materiaux de Strasbourg (FR))

01/07/2013, 16:45

The CMS GEM collaboration has proposed an upgrade of the CMS forward muon system with triple-GEM detectors. An extensive R & D program has demonstrated that these detectors have the rate capability and radiation resistance needed to operate in the environment of the high-luminosity LHC. Moreover, their excellent position resolution will enhance the performance of muon triggering and...

43. GET: A Generic Electronic System for TPCs for nuclear physics experiments

Emanuel Pollaco (CEA)

01/07/2013, 16:45

GET is an international program to develop a versatile, reconfigurable and scalable medium sized system to cover nuclear physics and particle requirements for instruments with up to 32k electronic channels with event rates of up to 1KHz. Signals are sampled with frequency of up to 100MHz on 512 deep circular capacitive arrays. 12bit time-stamped reduced data is transferred via micro-TCA units...

44. He‐CF4 and He‐CH4 mixtures for THGEM‐based GPMs operating at cryogenic temperatures

Shikma Bressler (Weizmann Institute of Science (IL))

01/07/2013, 16:45

This work presents the experimental measurements obtained for UV-induced photo-electron extraction efficiency from a CsI photocathode into He with CF4 and CH4 gas mixtures. A 1000Å CsI photocathode was deposited on a gold plated THGEM for photo-electron conversion. Charge-gain measurements were obtained with a Single-THGEM detector operating in these gas mixtures using a UV lamp for the...

41. High Resolution Single Photon Scanning Device for TGEMs

Gergo Hamar (MTA KFKI RMKI)

01/07/2013, 16:45

TGEM based micropattern gaseous photon detecotrs suffer from inefficiencies on photo-electron collection and detection due to the microstructure of the TGEM's surface. An exploration of this structure can lead to deeper understanding and optimization of construction parameters. Built from a proper optical section attached to a three dimensional scanning device a focused single photo-electron...

36. Novel ideas for fabrication of hard X‐ray imagers by combination of nano photo converter or nano scintillator with GEM detector

Shahyar Saramad

01/07/2013, 16:45

One of the most marvelous applications of GEM is hard X-ray imaging. We suggested a novel nanostructure photo converter combined with GEM detector to increases the efficiency of X-ray detection by increasing the surface to volume ratio. Since the energy is deposited in the volume of the photo converter but the electrons can only escape from the surface, so by increasing the surface to volume...

45. Pattern recognition of Xe‐136 double beta decay signal in a High Pressure Xe gaseous TPC

Laura Segui Iglesia (Departamento de Fisica Teorica-Facultad de Ciencias-Universidad)

01/07/2013, 16:45

Neutrinoless double beta decay could give essential information about neutrino mass and nature. One of the nowadays experimental approaches to look for the double beta decay is to use a high pressure gaseous TPC due to the good energy resolution and the topological information of each event that can be obtained with a pixelized gaseous detector. Pattern recognition may help to discriminate...

47. Performance Studies of a MicroMeGas Chamber in the ATLAS Environment

Konstantinos Ntekas (National Technical Univ. of Athens (GR))

01/07/2013, 16:45

Five small prototype MicroMeGas detectors were positioned in the ATLAS detector during LHC running at sqrt(s) = 7 and 8 TeV. A 9 x 5 cm2 two-gap detector was placed in front of the electromagnetic calorimeter and four 10 x 10 cm2 on the ATLAS Small Wheels, the first station of the forward muon spectrometer. The one attached to the calorimeter was exposed to rates that are orders of magnitude...

39. Progresses in the production of large‐size THGEM boards

Stefano Levorato (Universita e INFN (IT))

01/07/2013, 16:45

The THicK GEM (THGEM) electron multipliers are derived from the GEM design, by scaling the geometrical parameters and changing the production technology: THGEMs are PCBs produced by etching and drilling. THGEMs can be produced in large series and large size at moderate cost with standard PCB technology, in spite of the large number of holes: some millions per square meter. Small-size (a few...

48. Radiopurity control in rare event experiments using micromegas

Susana Cebrian (University of Zaragoza)

01/07/2013, 16:45

Micromesh gas amplification structures (Micromegas) are being used or considered as readout of Time Projection Chambers (TPCs) in the field of Rare Event searches (dealing with dark matter, double beta decay or solar axions). The topological information of the events offered by these gaseous detectors could provide a very powerful tool of signal identification and background rejection. But in...

38. Study of long‐term operation of triple‐GEM detectors for the high rate environment in CMS

Jeremie Alexandre Merlin (Institut de Physique et Chimie des Materiaux de Strasbourg (FR))

01/07/2013, 16:45

The CMS GEM collaboration is developing Gas Electron Multiplier (GEM) detectors for use in the endcap muon detector of the CMS experiment. The GEM detectors can operate well in the environment expected at the high-luminosity LHC. To insure long-term operation of the detectors, we test for gain drop, gain non-uniformity, dark current increase, discharge rate increase, and resolution loss after...

49. Study on the effect of dust on leakage current of bulk micro‐MEGAS detector

Bo Wang (IHEP)

01/07/2013, 16:45

In this paper, the effect of dust trapped in avalanche region on the leakage current of standard bulk micro-MEGAS detector is studied. Pyralux PC1025 layers of DuPont are introduced in bulk technique and 30×30mm bulk micro-MEGAS detector is fabricated with pillars of 300μm diameter. Stainless steel woven mesh with pitch of 40μm is used as avalanche electrode. PMMA (polymethyl methacrylate)...

42. The simulation of gas avalanche in a Micro Pixel Chamber using Garfield++

Atsuki Takada

01/07/2013, 16:45

A micro pixel chamber (uPIC), the development of which started in 2000 as a kind of micro pattern gas detector, has a high gas gain over 6,000 in stable operation, a large detection area of 900 cm2, and a fine position resolution of about 120 um, and it is used at MeV gamma-ray astronomy, dark matter search, medical imaging, neutron imaging, small-angle X-ray scattering, and so on. However,...

50. Towards smaller gap microbulks

esther ferrer ribas

01/07/2013, 16:45

Small gap micromegas detectors (< 50 µm) are optimized for high pressure applications. Combining the microbulk manufacturing technique with a small gap can result in attractive detectors for rare event searches, in particular double beta decay or dark matter search. We will present results obtained with small gap microbulks (25 and 12.5 µm) as well as their limitations.

46. Xe‐TMA for high‐pressure Time Projection Chambers

Pablo Pons

01/07/2013, 16:45

Xe-TMA is a strong Penning mixture at high pressure presumably due to a Nature fine-tuned resonant energy-transfer of Xenon low-lying metastable states to TMA ionized states. Xe-TMA offers many potential advantages for a high pressure gaseous TPC aimed at ultimate energy resolution and topological information, through: 1) An anticipated reduction of the Fano factor, theoretically allowing for...