The CLAS12 Data Acquisition System

Boyarinov, S.V.; Raydo, B.; Cuevas, C.; Dickover, C.; Dong, Hai; Heyes, W.G.; Abbott, D.; Gu, William; Gyurjyan, V.; Jastrzembski, E.; Moffit, B.; Timmer, C.; Mandjavidze, I.; Heddle, D.; Smith, C.; Celentano, A.; Vita, R. De; Baltzell, N. A.; Livingston, K.; McKinnon, B.; Moore, W.H.

doi:10.1016/j.nima.2020.163698

Cited by 29 publications

(17 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…GEMC supports the emulation of the CLAS12 data 210 acquisition system (DAQ) [23]. The CLAS12 data are expressed as specific collections of numbers, or "banks", that keep related numbers together.…”

Section: Clas12 Data Acquisition and Trigger Emulationmentioning

confidence: 99%

The CLAS12 Geant4 simulation

Ungaro

Angelini

Battaglieri

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

The Geant4 Monte-Carlo (GEMC) package is used to simulate the passage of particles through the various CLAS12 detectors. The geometry is implemented through a database of Geant4 volumes created either through the GEMC native API, by the CLAS12 geometry service, or imported from the CAD engineering model. The truth information is digitized with a plugin mechanism by routines specific to each detector and includes the use of the CLAS12 calibration database constants to produce both ADC and TDC response functions. Theoretical models that produce the generated events interface with GEMC through the LUND data format. The merging of simulated data with real random trigger data provides a mechanism to include both beam and electronic background into the simulation of generated events to accurately model beam data from the CLAS12 detector. The performance of simulation is demonstrated by comparison with the experimental data.

show abstract

Section: Clas12 Data Acquisition and Trigger Emulationmentioning

confidence: 99%

The CLAS12 Geant4 simulation

Ungaro

Angelini

Battaglieri

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

show abstract

“…The back-end of the data acquisition system of the MVT is based on the JLab standard VME/VXS hardware including a Trigger Interface (TI), a Signal Distribution (SD), a Subsystem Processor (SSP), and a crate controller single-board computer (SBC) [18]. The flow of the trigger, data, and control messages is shown in Fig.…”

Section: The Back-end Unit (Beu)mentioning

confidence: 99%

“…The SBC executes the data collection and the run control tasks within the CODA software framework [18]. It also completes the data integrity checks performed in the SSP firmware, disentangles multi-event buffers, forms MVT events concatenating the FEU/SSP data with the corresponding TI data, and sends them to the CLAS12 Event Builder over a 10 GB/s Ethernet link.…”

Section: The Back-end Unit (Beu)mentioning

confidence: 99%

“…The MVT barrel was first commissioned with cosmic rays in the assembly room until mid-October 2017 and for the first two weeks Before the start of data taking with beam, several cosmic ray runs were performed aimed at tuning and optimizing the integration of the data acquisition system and the slow controls (i.e. remote controls, interlocks, and monitoring) [18], and the gas delivery system. The online data monitoring system was developed to allow the inspection of raw quantities such as the hit maps, the pulse shape, and the timing of the signals.…”

Section: Commissioningmentioning

confidence: 99%

See 1 more Smart Citation

The CLAS12 Micromegas Vertex Tracker

Acker

Attié

Aune

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

The Micromegas Vertex Tracker was designed to improve upon the tracking capabilities of the baseline design of the CLAS12 spectrometer in Hall B at Jefferson Laboratory. A Barrel Micromegas Tracker made with six concentric cylinders, each made of three 120 • -sector tiles, surrounds the Silicon Vertex Tracker, and a Forward Micromegas Tracker composed of 6 disks is placed 30 cm downstream of the liquid-hydrogen target. Both trackers sit in a 5 T solenoid magnetic field. All Micromegas elements are based on resistive technology to withstand luminosities up to 10 35 cm −2 s −1 , as well as on bulk technology to enforce gain uniformity and mechanical robustness. Due to the high magnetic field, dedicated electronics have been designed and displaced ∼2 m away from the detectors. The electronics readout is based on the DREAM ASICs that allow sustained operation up to 20 kHz trigger rate at the maximum luminosity.

show abstract

“…The typical frequency of the LED light pulses is in the range of 6 to 10 kHz and is defined by a stan-1075 dard pulse generator. The results obtained during the CLAS12 commissioning run and the following physics run with an electron beam have shown that the information provided by the JLab proprietary FADC250 modules (250 MHz Flash ADCs) [7] for 1080 the HTCC signal strength and timing is sufficient.…”

mentioning

confidence: 99%

The CLAS12 high threshold Cherenkov counter

Sharabian

Burkert

Biselli

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

The High Threshold Cherenkov Counter (HTCC) is one of the detector systems of the CLAS12 spectrometer, and is used to generate a fast trigger signal in electron scattering experiments in the polar angle range from 5 • to 35 • . The HTCC is installed in front of the drift chambers and introduces a minimal amount of additional material within the acceptance. The HTCC is one unit whose core component is a multifocal mirror that consists of 60 lightweight ellipsoidal mirrors. It is important that the HTCC provides efficient coverage of the CLAS12 forward acceptance with no gaps. In order to achieve this, each sector of the CLAS12 Forward Detector is covered by 2 identical half-sector mirrors that focus Cherenkov light on 8 phototubes. The HTCC has a total of 48 channels with Electron Tubes 9823QKB photomultipliers that have a 5-in quartz face plate to detect Cherenkov light. The system provides rejection of charged π-mesons with momenta below 4.8 GeV for the reliable identification of scattered electrons. In this paper the details of the design, construction, calibration, and performance results of the HTCC are presented. 10 (see Fig. 1) of CLAS12 was designed and built to fulfill the goal of detecting scattered electrons in the range of polar angles from 5 • to 35 • in conjunction with other detector systems of the CLAS12 Forward Detector and to generate a fast trigger signal 15 for event readout.The distinguishing features of the detector were influenced by its location in front of the drift chambers (DC) [2], which required that the HTCC incorporate a minimum amount of material in the 20 active area in front of the tracking detectors. Because the HTCC is a single module system, it occupies very limited space within CLAS12. Consequently, the construction requirements (including transportation to the hall and installation into the 25 nominal location of the detector) were important for its structural design.

show abstract

The CLAS12 Data Acquisition System

Cited by 29 publications

References 7 publications

The CLAS12 Geant4 simulation

The CLAS12 Geant4 simulation

The CLAS12 Micromegas Vertex Tracker

The CLAS12 high threshold Cherenkov counter

Contact Info

Product

Resources

About