Results 1 - 10 of 3501
Results 1 - 10 of 3501. Search took: 0.036 seconds
|Sort by: date | relevance|
[en] Measurements of the first prototype VMM1 ASIC designed at Brookhaven National Laboratory in 130 nm CMOS and fabricated in spring 2012 are presented. The 64-channel ASIC features a novel design for use with several types of micropattern gas detectors. The data driven system measures peak amplitude and timing information in tracking mode including sub-threshold neighbors and first channel hit address in trigger mode. Several programmable gain and integration times allows the flexibility to work with Micromegas, Thin Gap Chambers (TGCs), and Gas Electron Multiplier (GEM) detectors. The IC design and features are presented along with measurements characterizing the performance of the VMM1 such as noise, linearity of the response, time walk, and calibration range
[en] A channel electron multiplier is described having a tubular wall coated with a secondary-electron emitting material and including an electric field for accelerating the electrons, the electric field comprising a plurality of low-resistive conductive rings each alternating with a high-resistive insulating ring. The thickness of the low-resistive rings is many times larger than that of the high-resistive rings, being in the order of tens of microns for the low-resistive rings and at least one order of magnitude lower for the high-resistive rings; and the diameter of the channel tubular walls is also many times larger than the thickness of the high-resistive rings. Both single-channel and multiple-channel electron multipliers are described. A very important advantage, particularly in making multiple-channel multipliers, is the simplicity of the procedure that may be used in constructing such multipliers. Other operational advantages are described
[en] Use of single-electron amplitude resolution for describina properties of secondary electron multipliers of an open type is described and an example of its misuse is given. It is noted that the single-electron amplitude resolution is a characteristic of pulse amplitude distribution obtained during particle recording, which during the first collision on coming into the secondary-electron multiplier can form only one secondary electron
[en] The CMS collaboration considers upgrading the muon forward region with Gas Electron Multiplier (GEM) chambers, which are able to handle the extreme particle rates expected in this region along with a high spatial resolution. This allows to combine tracking and triggering capabilities, resulting in a lower trigger threshold along with improved muon identification and track reconstruction. In the last year the GEM project took a major leap forward by integrating triple-GEM chambers in the official CMS software, allowing physics studies to be carried out. Several benchmark analyses have been studied for the impact of such detector upgrade on the physics performance. In this contribution the status of the CMS upgrade project with the usage of GEM detector will be reviewed, discussing the trigger, the muon reconstruction performance, and the impact on the physics analyses
[en] An improved self-stretching technique is introduced to construct gaseous electron multiplier (GEM) chamber with size larger than 1 meter. This new assembly method, called as ''sliding self-stretching'', gives more uniform stretching force and better performance compared to its original version.
[en] 34 bibliographical notices with abstracts translated into French language are presented. This addendum is made from abstract journals (E E A and NSA), issued from July 1973 to June 1974
[fr]On presente une liste de 34 notices bibliographiques avec resumes en francais comme addenda a l'etude bibliographique parue en Mai 1974. Cette liste provient de la consultation des revues bibliographiques Electrical and Electronics Abstracts et Nuclear Science Abstracts parues de Juillet 1973 a Juin 1974
[en] A novel approach which uses Fiber Bragg Grating (FBG) sensors has been utilized to assess and monitor the flatness of Gaseous Electron Multipliers (GEM) foils. The setup layout and preliminary results are presented.
[en] Performance and aging tests have been done to characterize Gas Electron Multipliers (GEMs), including further design improvements such as a thicker GEM and a closed GEM. Since the effective GEM gain is typically smaller than the absolute GEM gain, due to trapping of avalanche electrons at the bottom GEM electrode, the authors performed field simulations and measurements for better understanding, and discuss methods to eliminate this effect. Other performance parameters of the GEMs are also presented, including absolute GEM gain, short-term and long-term gain stabilities