The Experts below are selected from a list of 12720 Experts worldwide ranked by ideXlab platform
Chaouki Boulahouache - One of the best experts on this subject based on the ideXlab platform.
-
The ATLAS LAr Calorimeter Level 1 Trigger Signal Pre-Processing System: Installation, Commissioning and Calibration Results
IEEE Transactions on Nuclear Science, 2010Co-Authors: Chaouki BoulahouacheAbstract:We describe the ATLAS Liquid Argon calorimeter (LAr) electronics used to prepare Signals for the L1 Trigger, studied with a standalone data acquisition system built for the commissioning of the LAr-L1 electronics. This includes calibration data used to extract gains of all LAr calorimeters and timing shifts for different layers of the electromagnetic (EM) calorimeter. Analysis tools have been developed to study the pulse shape, timing, and amplitude, which are employed for the readout of Signals from both the main detector and the L1 branch. Performance studies using beam data is also shown.
-
The ATLAS LAr calorimeter Level 1 Trigger Signal pre-processing system: Installation, commissioning and calibration results
2009 16th IEEE-NPSS Real Time Conference, 2009Co-Authors: Chaouki BoulahouacheAbstract:We describe the ATLAS Liquid Argon calorimeter (LAr) electronics used to prepare Signals for the L1 Trigger, together with the system used in the commissioning of the LAr-L1 output. This includes calibration data used to extract gains of all LAr calorimeters and timing shifts for different layers of the electromagnetic (EM) calorimeter. Analysis tools have been developed to study the pulse shape, time and amplitude for both the main readout and the L1 Signals. Performance studies using beam data is also shown.
Qian Li - One of the best experts on this subject based on the ideXlab platform.
-
Control of Long Pulse Pumped Supercontinuum Generation Using Weak Trigger Signal
Journal of Lightwave Technology, 2020Co-Authors: Chao Huang, Kaliyaperumal Nakkeeran, Qian LiAbstract:Through numerical simulations, we study the effects of weak continuous wave (CW) or weak pulse Triggering on the picosecond (ps) pulse pumped supercontinuum (SC) generation. To actively improve the spectral broadening and control both phase and intensity stability of the SC generation, we fix the frequency shift of the Trigger pulse (with respect to the pump Signal) with different durations and then tune the peak power. Detailed simulation results show that either a weak CW or weak pulse Trigger can greatly improve the spectral broadening of SC spectrum generated by a ps pulse pump. Compared to weak CW Trigger, a weak femtosecond (fs) pulse or ps pulse Trigger can assist the generation of SC with much better coherence and SNR, but precise control of the time delay between the pump and Trigger is required.
-
Design and implementation of high speed data acquisition card based on FPGA for matrix-assisted laser desorption/ionization time-of-flight mass spectrometer
2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC), 2016Co-Authors: Qian Li, Ming Wang, Yang YuAbstract:This paper develops a high speed data acquisition card (DAQ) based on FPGA for matrix-assisted laser desorption/ionization time-of-flight mass spectrometer (MALDI TOF-MS). Time interleaved analog-to-digital conversion based on parallelism is an effective way to meet the requirement of the ultra-fast sampling rate up to 3 Gsps. Multi-waveform accumulation algorithm is used to obtain mass spectrum with a large peak value. In order to ensure the multi-waveform have the same start point, an algorithm which can make a Trigger Signal delayed precisely is developed. The solution of hardware realization has been put forward while some main modules have been expounded in detail. At last, the testing of the DAQ card is presented, and the testing result shows that, the acquisition card has high dynamic performance, and the time-jitter of waveforms is within 1 ns.
D. Ramsden - One of the best experts on this subject based on the ideXlab platform.
-
A compact readout system for multi-pixel hybrid photodiodes
IEEE Transactions on Nuclear Science, 1999Co-Authors: C.p. Datema, L.j. Meng, D. RamsdenAbstract:The excellent properties of the recently developed multi-pixel hybrid photodiodes (M-HPD) will be easier to exploit following the development of the new hybrid read-out circuits described in this paper. This system will enable all of the required read-out functions to be accommodated on a single board into which the M-HPD is plugged. The design and performance of a versatile system is described in which a Trigger-Signal, derived from the common-side of the silicon anode in the M-HPD, is used to Trigger the readout of the 61-anode pixels in the M-HPD. The multi-channel amplifier section is based on the use of a new, commercial VLSI chip, whilst the read-out sequencer uses a chip of our own design. The common anode Signal is processed by a fast amplifier and discriminator to provide a Trigger Signal when a single event is detected. In the prototype version, the serial analogue output data-stream is processed using a PC-mounted, high speed ADC. Results obtained using the new read-out system in a compact gamma-camera and with a small muon tracking-chamber demonstrate the low-noise performance of the system. The application of this read-out system in other position-sensitive or multi-anode photomultiplier tube applications are also described.
-
A compact readout system for multi-pixel hybrid photodiodes
1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255), 1998Co-Authors: C.p. Datema, L.j. Meng, D. RamsdenAbstract:The excellent properties of the recently developed, multi-pixel hybrid photodiodes, will be easier to exploit following the development of the new hybrid-circuits described in this paper. This system will enable all of the required read-out functions to be accommodated on a single board into which the M-HPD is plugged. The design and performance of a versatile system is described in which a Trigger-Signal, derived from the common-side of the silicon anode in the M-HPD, is used to Trigger the readout of the 61-anode pixels in the M-HPD. The multi-channel amplifier section is based on the use of a new, commercial VLSI chip, whilst the read-out sequencer uses a chip of our own design. The common anode Signal is processed by a fast amplifier and discriminator to provide a Trigger Signal when a single event is detected. In the prototype version, the serial analogue output data-stream is processed using a PC-mounted, high speed ADC. Results obtained using the new read-out system in a compact gamma-camera and with a small muon tracking-chamber demonstrate the low-noise performance of the system. The application of this read-out system in other position-sensitive or multi-anode photomultiplier tube applications are also described.
D. Jones - One of the best experts on this subject based on the ideXlab platform.
-
A simple and reliable, optical all-fibre, data acquisition Trigger Signal for fibre-laser asynchronous optical sampling systems
Measurement Science and Technology, 2019Co-Authors: X. Yang, Hongfei Zhang, Bo Su, Yaxiong Wu, Jingsuo He, D. JonesAbstract:We present an optical all-fibre data acquisition Trigger Signal particularly suited for fibre-laser asynchronous optical sampling systems. We demonstrate that in the case where the laser spectra are inadequately matched and deliver a weak interferometric Signal, post electronic filtering can significantly enhance the Signal, removing the necessity for optical band-pass filtering. The method requires no free-space optics and no precise alignment of focused beam spots, eliminating beam pointing stability and walk-off issues.
-
Asynchronous optical sampling data-acquisition Trigger-Signal derived from pulse coherence coincidence
Review of Scientific Instruments, 2018Co-Authors: Hongfei Zhang, Bo Su, X. Yang, Yaxiong Wu, Jingsuo He, Cunlin Zhang, D. JonesAbstract:We propose a data acquisition Trigger Signal, suitable for free-space, asynchronous optical sampling (ASOPS) systems, based on Laser Pulse Coherence (LPC). At 1 GHz laser pulse repetition frequencies and higher, this method becomes an attractive alternative to established techniques, as it lacks the necessity of high peak pulse intensity, maximising the total laser power available for measurements. Additional advantages are the large unamplified Signal generated, ease of initial alignment, and greatly reduced beam pointing stability errors. Employing a LPC Trigger source, we realise a sub 30 fs Trigger timing error for our ASOPS system.We propose a data acquisition Trigger Signal, suitable for free-space, asynchronous optical sampling (ASOPS) systems, based on Laser Pulse Coherence (LPC). At 1 GHz laser pulse repetition frequencies and higher, this method becomes an attractive alternative to established techniques, as it lacks the necessity of high peak pulse intensity, maximising the total laser power available for measurements. Additional advantages are the large unamplified Signal generated, ease of initial alignment, and greatly reduced beam pointing stability errors. Employing a LPC Trigger source, we realise a sub 30 fs Trigger timing error for our ASOPS system.
G. Anton - One of the best experts on this subject based on the ideXlab platform.
-
3D-position-sensitive compact scintillation detector as absorber for a Compton-camera
IEEE Transactions on Nuclear Science, 2005Co-Authors: N. Uhlmann, S. Wolfel, J. Pauli, G. AntonAbstract:An absorption detector based on scintillator material and position-sensitive photomultipliers for a high resolution Compton-Camera prototype has been developed. The design of the Compton-Camera puts several demands on the absorption detector. For coincidence measurements it is necessary to have a very fast Trigger Signal and a fast Signal output, due to the high rate of events. The energy of the primary photons requires the use of a thick scintillator block as an absorber, causing the problem of parallax effects in event reconstruction. Therefore a 3D-position resolution of the interaction point is needed. This is achieved by using position-sensitive photomultiplier tubes (PS-PMTs) for the readout of the scintillator. The design specifications and the performance of the complete detector will be presented in this paper.
-
3D-position sensitive compact scintillation detector as absorber for a Compton-Camera
2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515), 2003Co-Authors: N. Uhlmann, S. Wolfel, J. Pauli, G. AntonAbstract:An absorption detector based on scintillator material and position-sensitive photomultipliers for a high resolution Compton-Camera prototype has been developed. The design of the Compton-Camera determines several demands on the absorption detector. For coincidence measurements a very fast Trigger Signal and due to the high rate of events a fast Signal output is needed. The designated primary energy of the photons makes it necessary to use a thick scintillator material as absorber, which causes the problem of parallax effects in event reconstruction. Therefore a 3D-position resolution of the interaction point is obligatory which is achieved by using position-sensitive photomultiplier tubes (PS-PMT) for the readout of the scintillator. The design specifications and the performance of the complete detector will be presented in this poster.
