To meet new trigger and data acquisition (TDAQ) buffering requirements and withstand the high expected radiation doses at the High-Luminosity LHC, the ATLAS Liquid Argon Calorimeter readout ...electronics will be upgraded. The triangular calorimeter signals are amplified and shaped by analog electronics over a dynamic range of 16 bits, with low noise and excellent linearity. Developments of low-power preamplifiers and shapers in the 130 nm CMOS technology are ongoing to meet these requirements. In order to digitize the analog signals on two gains after shaping, a radiation-hard, low-power 40 MHz 14-bit Analog-to-Digital Converter (ADC) is developed using a pipeline + Successive Approximation Register (SAR) architecture in the 65 nm CMOS technology. Characterization of the prototypes of the front-end components show good promise to fulfill all the requirements. The signals will be sent at 40 MHz to the off detector electronics, where Field-Programmable Gate Arrays (FPGAs) connected through high-speed links will perform energy and time reconstruction through the application of corrections and digital filtering. Reduced data will be sent with low latency to the first level trigger, while the full data will be buffered until the reception of trigger accept signals. The data-processing, control and timing functions will be realized by dedicated boards connected through Advanced Telecommunications Computing Architecture (ATCA) crates.
A method of imaging of ultra-fast processes, like explosion or fast combustion, at a synchrotron radiation beam is being developed at the Siberian Synchrotron and Teraherz Radiation Center (SSTRC) . ...Two stations are operating at beam line 0 at the VEPP-3 storage ring and at beam line 8 at the VEPP-4M storage ring. Both stations are equipped with the detector for imaging of explosions DIMEX, based on high pressure ionization chamber, and allowing to record up to 100 one dimensional images with the frame rate of 8 MHz. However the maximum flux that DIMEX can detect is limited as well as spatial resolution and frame rate because of gas technology used. In view of significant increase of SR flux at the VEPP-4M beam line due to the new 9-pole 2 T wiggler, a new detector is being developed for this beam line, based on Si microstrip sensor. The first Si microstrip detector prototype has been mounted with new specially developed front-end ASIC that allows to record data with the rate of 50 MFrames/s. The first measurements with this prototype demonstrated significant improvement of all critical parameters of the detector compared to the gaseous version.
The paper describes a detector for carrying out diffraction experiments on a beam of synchrotron radiation, which is being developed at the Institute of Nuclear Physics of the Siberian Branch of the ...Russian Academy of Sciences. The detector will operate in the mode of direct counting of X-ray photons with an energy of more than 3–4 keV. A general description of the detector and its components is given, as well as a detailed description of the recording channel of an application-specific integrated circuit (ASIC). The results of the first measurements of the ASIC parameters are given and discussed in the article.
The electromagnetic CsI(Tl) calorimeter is one of the key systems in the Belle II detector. The calorimeter is aimed primarily at efficiently detecting photons over a wide energy range from several ...tens of MeV units to
GeV. A highly efficient data acquisition system is required for a continuous readout of signal events at a trigger rate corresponding to the maximum collider luminosity. Problems solved by such a system for the calorimeter of the Belle II detector are described.
New detector prototype is being developed for the “Plasma” scattering station of the VEPP-4M synchrotron radiation source at the Budker Institute of Nuclear Physics. The prototype is based on p-in-n ...silicon microstrip sensor with metal strips galvanicaly coupled to the p-implants. Each strip is connected to the input of low-noise integrator with 32 analogue memory cells. This approach allows to record time evolution of one-dimensional image of diffraction pattern with frame rate up to 10 MHz, spatial resolution of ∼130 μm (FWHM) and maximum photon flux of about 200 photons/channel.
Since 2018, the Belle II experiment has been running at KEK, at the SuperKEKB B-factory, with all detector subsystems taking data. One of the important detector systems is an electromagnetic ...calorimeter (ECL) that includes 8736 counters based on CsI(Tl) scintillation crystals. This report describes the data acquisition (DAQ) system that has been developed for ECL. Front-end electronics of ECL DAQ consist of several hundred highly configurable FPGA-controlled modules that utilize pipeline readout architecture and are able to handle a trigger rate up to 30 kHz. ECL front end electronics are initialized, configured and monitored by ECL DAQ software. The initialization library can work with several transport protocols, internally optimize requests to the electronics and perform caching of the configuration data. Configuration software manages and monitors more than 105 electronics parameters and updates them based on the calibrations. Continuous monitoring of ECL data quality is also implemented.
The process
e
+
e
-
→
n
n
¯
is studied in the experiment at the VEPP-2000
e
+
e
-
collider with the SND detector. The technique of the time measurements in the multichannel NaI(Tl) electromagnetic ...calorimeter is used to select
n
n
¯
events. The value of the measured cross section in the center-of-mass energy range from 1.894 to 2 GeV varies from 0.5 to 0.35 nb. The effective neutron timelike form factor is derived from the measured cross section and compared with the proton form factor. The ratio of the neutron electric and magnetic form factors is obtained from the analysis of the antineutron polar angle distribution and found to be consistent with unity.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The work describes a one-dimensional detector for diffraction experiments at a synchrotron radiation beam. The detector is being developed at the Budker Institute of Nuclear Physics, Siberian Branch, ...Russian Academy of Sciences. Until recently the institute was developing gas one-coordinate detectors, in particular a one-coordinate detector with calculated channels (OD-3M), based on the technology of multiwire proportional chambers. To provide a spatial resolution better than 100 microns at a photon energy in a wide energy range (3–30 keV), it is necessary to use solid-state microstrip or matrix sensors in combination with specialized integrated registration circuits. The developed SOCOD detector, using a microstrip sensor based on gallium arsenide as a registration element, operates in the mode of the direct counting of photons with an energy of more than 3–4 keV and a speed of up to 1 MHz/channel. The work gives a general description of the current version of the detector, a block diagram of the registration channel, the software allowing users to control the operation of the detector and display the results obtained, and the developed algorithm for leveling the trigger thresholds in the channels. The results of electronic tests, the work of the alignment algorithm and their discussion are presented.
The process
e
+
e
-
→
η
η
γ
is studied in the center-of-mass energy range 1.17–2.00 GeV using data with an integrated luminosity of 201 pb
-
1
collected by the SND detector at the VEPP-2000
e
+
e
-
...collider. The
e
+
e
-
→
η
η
γ
cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the
ϕ
η
intermediate state. Our result on the
e
+
e
-
→
η
η
γ
cross section is consistent with the
e
+
e
-
→
ϕ
η
measurement in the
ϕ
→
K
+
K
-
mode. The search for radiative processes contributing to the
e
+
e
-
→
η
η
γ
cross section is performed, and no significant signal is observed.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
A specialized integrated circuit was developed for the readout of signal from coordinate detectors of different types, including gas micro-pattern detectors and silicon microstrip detectors. The ASIC ...includes 64 channels, each containing a low-noise charge-sensitive amplifier with a connectable feedback capacitor and resistor, and fast reset of the feedback capacitor. Each channel of the ASIC also contains 100 cells of analogue memory where the signal can be stored at a rate of 10 MHz. The pitch of input pads is 50 μm and the chip size is 5×5 mm2. The equivalent noise charge of the ASIC channel is about 2000 electrons with 10 pF capacitance at the input and maximal signal before saturation corresponds to 2×106 electrons. The first application for this ASIC is the detector for imaging of explosions at a synchrotron radiation beam (DIMEX), where it has to substitute the old and slower APC128 ASIC. The full-size electronics including 8 ASICs for 512 channels was assembled and tested.
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