The Central Drift Chamber for GlueX

Jarvis, N. S.; Meyer, C. A.; Zihlmann, B.; Staib, M. J.; Austregesilo, A.; Barbosa, Fernando; Dickover, C.; Razmyslovich, V.; Taylor, S.; Haarlem, Y. Van; Visser, G.; Whitlatch, T.

doi:10.1016/j.nima.2020.163727

Cited by 18 publications

(14 citation statements)

References 16 publications

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“…The photon beam passes through a collimator in order to suppress the incoherent part, a triplet polarimeter [13] and a pair spectrometer [14], which provide continuous, non-invasive measurements of the photon beam polarization and the relative flux, respectively, before reaching the liquid hydrogen target. The target is surrounded by a scintillator start counter [15], a straw-tube central drift chamber [16] and a lead and scintillating-fiber barrel calorimeter [17], all inside the bore of a superconducting solenoid. Four sets of planar wire drift chambers [18] are also located inside the solenoid, downstream of the central drift chamber.…”

Section: Methodsmentioning

confidence: 99%

Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at Eγ
Adhikari¹,
Ali²,
Amaryan³
et al. 2020
Phys. Rev. C
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Section: Methodsmentioning

confidence: 99%

Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at Eγ
Adhikari¹,
Ali²,
Amaryan³
et al. 2020
Phys. Rev. C
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“…The target controls 39 are handled by a LabVIEW program, while a standard EPICS softIOC running in Linux provides a bridge between the controller and JLab's EPICS enviroment (see Section 11). Temperature readback and control of the condenser and target cell thermometers are managed by a four-input temperature controller 40 with PID control loops of 50 and 100 W. Strain gauge pressure sensors measure the fill and return pressures with 0.25% accuracy. When filled with subcooled liquid, the long-term temperature (±0.2 K) and pressure (±0.1 psi) stability of the liquid hydrogen enable a determination of the density to better than 0.5%.…”

Section: Targetmentioning

confidence: 99%

“…The Central Drift Chamber (CDC) is a cylindrical straw-tube drift chamber which is used to track charged particles by providing position, timing and energy loss measurements [39,40]. The CDC is situated inside the Barrel Calorimeter, surrounding the target and Start Counter.…”

Section: Central Drift Chambermentioning

confidence: 99%

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The GlueX beamline and detector

Adhikari

Akondi

Ghoul

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

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The GlueX experiment at Je↵erson Lab has been designed to study photoproduction reactions with a 9-GeV linearly polarized photon beam. The energy and arrival time of beam photons are tagged using a scintillator hodoscope and a scintillating fiber array. The photon flux is determined using a pair spectrometer, while the linear polarization of the photon beam is determined using a polarimeter based on triplet photoproduction. Charged-particle tracks from interactions in the central target are analyzed in a solenoidal field using a central straw-tube drift chamber and six packages of planar chambers with cathode strips and drift wires. Electromagnetic showers are reconstructed in a cylindrical scintillating fiber calorimeter inside the magnet and a lead-glass array downstream. Charged particle identification is achieved by measuring energy loss in the wire chambers and using the flight time of particles between the target and detectors outside the magnet. The signals from all detectors are recorded with flash ADCs and/or pipeline TDCs into memories allowing trigger decisions with a latency of 3.3 µs. The detector operates routinely at trigger rates of 40 kHz and data rates of 600 megabytes per second. We describe the photon beam, the GlueX detector components, electronics, data-acquisition and monitoring systems, and the performance of the experiment during the first three years of operation.

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“…In the CDC, the energy loss is obtained from the height of the first peak of each pulse instead of its integral, as this was found to give better resolution. The energy loss and track length in the straws traversed are used finally to compute the dE/dx [35]. The dE/dx in the material is described by the Bethe-Bloch formula [36] defined as…”

Section: Particle Identification In the Cdcmentioning

confidence: 99%

Exotic Meson Photoproduction at GlueX – Search for the hybrid candidate Y

Hamdi

2020

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Understanding the hadron spectrum is one of the primary goals of non-perturbative QCD. Many predictions have experimentally been confirmed, others still remain under experimental investigation. Of particular interest is how gluonic excitations give rise to states with constituent glue. One class of such states are hybrid mesons that are predicted by theoretical models and Lattice QCD calculations. Searching for and understanding the nature of these states is a primary physics goal of the GlueX experiment at the CEBAF accelerator at Jefferson Lab. A search for a J P C = 1 −− hybrid meson candidate, the Y (2175), in φ(1020)π + π + and φ(1020)f 0 (980) channels in photoproduction on a proton target has been conducted. A first measurement of non-resonant φ(1020)π + π + and φ(1020)f 0 (980) total cross sections in photoproduction has been performed. An upper limit on the resonance production cross section for the Y (2175) → φ(1020)π + π + and Y (2175) → φ(1020)f 0 (980) channels are estimated. Since the analysis essentially depends on the quality of the charged kaon identification, also an optimization of particle identification through an improvement of the energy loss estimation in the CDC by a truncated mean method has been investigated. i Kurzfassung ii List of Tables vi List of Figures ix xix 5.1 Kaon momentum versus the polar angle in MC, with kaon from the γp → Y (2175)p → φf 0 → K + K − π + π − p reaction. The boxes show the TOF (red) and DIRC (purple) coverages. .

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The Central Drift Chamber for GlueX

Cited by 18 publications

References 16 publications

Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at Eγ
Adhikari¹,
Ali²,
Amaryan³
et al. 2020
Phys. Rev. C
Self Cite
6
0
6
0
View full text Add to dashboard Cite

Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at Eγ
Adhikari¹,
Ali²,
Amaryan³
et al. 2020
Phys. Rev. C
Self Cite
6
0
6
0
View full text Add to dashboard Cite

The GlueX beamline and detector

Exotic Meson Photoproduction at GlueX – Search for the hybrid candidate Y

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The Central Drift Chamber for GlueX

Cited by 18 publications

References 16 publications

Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at EγAdhikari1, Ali2, Amaryan3 et al. 2020Phys. Rev. CSelf Cite6060View full textAdd to dashboardCite

Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at EγAdhikari1, Ali2, Amaryan3 et al. 2020Phys. Rev. CSelf Cite6060View full textAdd to dashboardCite

The GlueX beamline and detector

Exotic Meson Photoproduction at GlueX – Search for the hybrid candidate Y

Contact Info

Product

Resources

About

Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at Eγ
Adhikari¹,
Ali²,
Amaryan³
et al. 2020
Phys. Rev. C
Self Cite
6
0
6
0
View full text Add to dashboard Cite

Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at Eγ
Adhikari¹,
Ali²,
Amaryan³
et al. 2020
Phys. Rev. C
Self Cite
6
0
6
0
View full text Add to dashboard Cite