Power distribution studies for CMS forward tracker

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

The Compact Muon Solenoid (CMS) Tracker Collaboration has recently revised the tracking-detector layout. While the previous design relied on Micro Strip Gas Chamber (MSGC) and silicon detectors, the new layout implements solid state sensors as the sole technological choice. The new all-silicon layout is presented and the projected performance is discussed in terms of several benchmark topologies. #

Proceedings of The 25th International workshop on vertex detectors — PoS(Vertex 2016)

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2016

In order to address the problems caused by the harsh radiation environment during the high luminosity phase of the LHC (HL-LHC), all silicon tracking detectors (pixels and strips) in the CMS experiment will undergo an upgrade. And so to develop radiation hard pixel sensors, simulations have been performed using the 2D TCAD device simulator, SILVACO, to obtain design parameters. The effect of various design parameters like pixel size, pixel depth, implant width, metal overhang, p-stop concentration, p-stop depth and bulk doping density on the leakage current and critical electric field are studied for both non-irradiated as well as irradiated pixel sensors. These 2D simulation results of planar pixels are useful for providing insight into the behaviour of non-irradiated and irradiated silicon pixel sensors and further work on 3D simulation is underway.

1999

The APVD_DC realised in the DMILL technology is a radiation-hard integrated circuit for front-end readout electronics of the silicon tracker of CMS. DC-coupled silicon microstrip detectors have significant economical advantages compared to AC-coupled devices mainly due to their less complex fabrication process and better yield. The APVD_DC allows the use of DCcoupled silicon detectors with significant leakage currents as it is expected due to irradiation after several years of LHC operation. In this paper, a solution is presented with an active individual leakage current compensation technique for each input channel. The APVD_DC contains 128 identical analogue channels, each one composed of a low noise preamplifier, a CR-RC shaper, a 160 cells-deep analogue pipeline and an analogue signal processing stage. A deconvolution filter at the latest stage recuperates the initial fast response function of a silicon detector and confines it to one LHC bunch crossing. The 128 analogue channel...

Journal of Instrumentation, 2014

Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093), 2000

The AMS experiment is designed to search for the antimatter components of cosmic rays, the products of the annihilation of dark matter particles and to perform additional cosmic-ray measurements like spectrum of light nuclei, antiprotons and positrons as well as Iso-topic composition for light elements. The complete AMS instrument will be installed on the space station Alpha in year 2003. A preliminary version of the apparatus has flown in June 1998 on the Space Shuttle mission STS-91. The power supply system of the tracker, described in this paper, has been con-structed optimizing noise performances, following space qualification criteria for a ten day mission on the shuttle and considering the operation in the fringe magnetic field of the spectrometer. This paper also includes a short description of tracker electronics to be powered. Optimisation and qualification tests on the complete power supply system are also reported.

Proceedings of Topical Workshop on Electronics for Particle Physics — PoS(TWEPP2019)

ATLASpix3 is a 2×2 cm 2 high voltage CMOS sensor chip designed to meet the specifications of outer layers of ATLAS inner tracker. It is compatible with the hybrid pixel sensor ASIC RD53A in terms of electronic interface and geometry. ATLASpix3 is a depleted monolithic CMOS pixel detector which allows the construction of quad modules of the same size as that of hybrid sensors. The readout scheme can be externally configured as triggered or triggerless column drain readout. The hit information is transmitted through a 1.28 Gbit/s serial link. The interface is based on a single command input that is used for providing clock, trigger and configuration commands. This contribution summarizes the detector architecture with focus on the design of its readout circuitry. In addition, simulation results obtained using ReadOut Modelling Environment (ROME), that led to the design of the readout system are discussed.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007

The CMS Forward Pixel Tracker will consist of two end-cap blocks, each made of two disks lodging sensors and Read-Out Chips (ROCs) (grouped into plaquettes of different sizes) for a total of about 18 million read-out channels. During the assembly phase, prior to the physical mounting of the plaquettes on the disks a thorough electronic test is necessary to check each channel for functionality, noise level, required threshold trimming and bump-bond quality. To this extent a complete test-stand system, based on custom PCI cards and specialized software, has been developed. Different methods have been evaluated and implemented to electronically assess the amount of malfunctioning bump-bonds. Determination of the correct parameters for initialization of the ROCs has also been implemented as an automatic procedure; data are finally fed into a centralized database for subsequent retrieval during detector initialization or for off-line analysis. In this paper we describe requirements, design and implementation of such a system, which is currently in use at the Silicon Detector Facility (SiDet) Laboratory of FNAL for the final assembly of the Forward Tracker system.

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2001

The APV25 is a 128-channel analogue pipeline chip for the readout of silicon microstrip detectors in the CMS tracker at the LHC. Each channel comprises a low noise amplifier, a 192-cell analogue pipeline and a deconvolution readout circuit. Output data are transmitted on a single differential current output via an analogue multiplexer. The chip is fabricated in a standard 0.25 mm CMOS process to take advantage of the radiation tolerance, lower noise and power, and high circuit density. Experimental characterisation of this circuit shows full functionality and good performance both in pre-and post-irradiation (20 Mrad) conditions. The measured noise is significantly reduced compared to earlier APV versions. A description of the design and results from measurements prior to irradiation are presented. #