The CLAS12 superconducting magnets

Fair, Ruben; Baltzell, N. A.; Bachimanchi, Ramakrishna; Biallas, G.; Burkert, Volker; Campero-Rojas, P.; Elementi, L.; Elouadrhiri, L.; Eng, B.; Ghoshal, Probir K.; Hogan, John P.; Insley, D.; Kashikhin, V.S.; Kashy, D.; Krave, Steven; Kumar, O. Rajesh; Laney, M.; Legg, R.; Lagerquist, V.; Lester, M.; Lemon, T.; Lung, A.; Luongo, C.A.; Matalevich, Joseph R.; Mestayer, M. D.; Miller, R.; Moore, W.H.; Newton, Joseph; Nobrega, F.; Pastor, O.; Philip, Sarin; Rajput-Ghoshal, Renuka; Ganni, V.; Rode, C.; Sandoval, N.; Spiegel, S.; Tilles, D.; Tremblay, K.; Velev, G.; Wilson, C.T.; Wiseman, M.; Young, G. R.

doi:10.1016/j.nima.2020.163578

Cited by 12 publications

(3 citation statements)

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“…1. It is specifically designed to operate inside the 12 GEV CEBAF Large Acceptance Spectrometer (CLAS12) [1] and uses the spectrometer's 5 T solenoid magnet [2] for the dynamic nuclear polarization (DNP) process. In order to reach the center of the solenoid and avoid interference with the CLAS12 Central Detector and its electronics, the target cryostat must be approximately 3 m long.…”

Section: Descriptionmentioning

confidence: 99%

First Use of a Longitudinally Polarized Target with CLAS12

Keith¹,

Brock²,

Carlin³

et al. 2023

Proceedings of 19th Workshop on Polarized Sources, Targets and Polarimetry — PoS(PSTP2022)

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Run Group C comprises eight experiments utilizing the CLAS12 detector system in Hall B at Jefferson Lab to study the multidimensional partonic structure of nucleons. The experiments scatter electrons from polarized protons and neutrons in samples of solid NH 3 and ND 3 , dynamically polarized at a temperature of 1 K in a 5 T magnetic field. After a brief description of the target system, the current status of the target and preliminary results of its performance in the experiment are presented.

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Section: Descriptionmentioning

confidence: 99%

First Use of a Longitudinally Polarized Target with CLAS12

Keith¹,

Brock²,

Carlin³

et al. 2023

Proceedings of 19th Workshop on Polarized Sources, Targets and Polarimetry — PoS(PSTP2022)

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“…The 1 K refrigerator is described elsewhere in these proceedings [2], while the field is generated by a 5 T superconducting solenoid that is part of the base CLAS12 detector package. [3].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Requirements for the CLAS12 Polarized Target

Lagerquist¹

2020

Proceedings of the 18th International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2019)

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Upcoming spin structure experiments in Hall B at Jefferson Lab will employ a new dynamically polarized target inside the CLAS12 detector system. Protons and deuterons in irradiated NH 3 and ND 3 will be polarized at 1 K using the 5 T field of the CLAS12 solenoidal magnet. For optimum polarization, the field uniformity requirements are around 100 ppm over the volume of the target sample. I will discuss methods to improve field uniformity utilizing thin superconducting shim coils integrated within the 1 K refrigerator. I will also demonstrate that this method to adjust the 5 T field also enables the simultaneous opposite polarization of two adjacent target cells.

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“…In Hall A, a new super big bite spectrometer (SBS) has been added to the existing high resolution spectrometer pair HRS 2 , and other large installation experiments have been proposed. Complementing the new equipment is the highly spin-polarized electron gun, high-power cryogenic targets, and several spinpolarized targets using NH 3 , ND 3 , HD, 3 He, and 7 Li as target materials to support a broad range of polarization measurements.…”

mentioning

confidence: 99%

The CLAS12 Spectrometer at Jefferson Laboratory

Burkert

Elouadrhiri

Adhikari

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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108

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The CEBAF Large Acceptance Spectrometer for operation at 12 GeV beam energy (CLAS12) in Hall B at Jefferson Laboratory is used to study electro-induced nuclear and hadronic reactions. This spectrometer provides efficient detection of charged and neutral particles over a large fraction of the full solid angle. CLAS12 has been part of the energy-doubling project of Jefferson Lab's Continuous Electron Beam Accelerator Facility, funded by the United States Department of Energy. An international collaboration of over 40 institutions contributed to the design and construction of detector hardware, developed the software packages for the simulation of complex event patterns, and commissioned the detector systems. CLAS12 is based on a dual-magnet system with a superconducting torus magnet that provides a largely azimuthal field distribution that covers the forward polar angle range up to 35 • , and a solenoid magnet and detector covering the polar angles from 35 • to 125 • with full azimuthal coverage. Trajectory reconstruction in the forward direction using drift chambers and in the central direction using a vertex tracker results in momentum resolutions of <1% and <3%, respectively. Cherenkov counters, time-of-flight scintillators, and electromagnetic calorimeters provide good particle identification. Fast triggering and high data-acquisition rates allow operation at a luminosity of 10 35 cm −2 s −1 . These capabilities are being used in a broad program to study the structure and interactions of nucleons, nuclei, and mesons, using polarized and unpolarized electron beams and targets for beam energies up to 11 GeV. This paper gives a general description of the design, construction, and performance of CLAS12.

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The CLAS12 superconducting magnets

Cited by 12 publications

References 30 publications

First Use of a Longitudinally Polarized Target with CLAS12

First Use of a Longitudinally Polarized Target with CLAS12

Magnetic Field Requirements for the CLAS12 Polarized Target

The CLAS12 Spectrometer at Jefferson Laboratory

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