skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Implementation of the Polarized HD target at the Thomas Jefferson National Accelerator Facility

Abstract

The original goal of this proposal was to study frozen spin polarized targets (HD target and other technologies) and produce a conceptual design report for the implementation of such a target in the HALL B detector of the Thomas Jefferson National Accelerator Facility (JLab). During the first two years of the proposal, we came to the conclusion that the best suited target for JLab was a frozen spin target and helped with the design of such a target. We have not only achieved our original goal but have exceeded it by being involved in the actual building and testing of parts the target. The main reason for this success has been the hiring of a senior research associate, Dr. Oleksandr Dzyubak, who had more than 10 years of experience in the field of frozen spin polarized targets. The current grant has allowed the USC nuclear physics group to strengthen its role in the JLab collaboration and make important contribution to both the detector development and the scientific program.

Authors:
;
Publication Date:
Research Org.:
University of South Carolina, Columbia, SC 29208
Sponsoring Org.:
USDOE - Office of Science (SC) EPSCoR
OSTI Identifier:
898823
Report Number(s):
DOE/ER/45959-1
TRN: US0702613
DOE Contract Number:
FG02-02ER45959
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CEBAF ACCELERATOR; DESIGN; IMPLEMENTATION; NUCLEAR PHYSICS; POLARIZED TARGETS; SAFETY REPORTS; SPIN; TARGETS; TESTING; Polarized Target; Frozen Spin Mode; Polarizing Magnet; Holding Magnet; Photonuclear Reactions; CLAS detector; Jefferson Laboratory

Citation Formats

Chaden Djalali, and David Tedeschi. Implementation of the Polarized HD target at the Thomas Jefferson National Accelerator Facility. United States: N. p., 2007. Web. doi:10.2172/898823.
Chaden Djalali, & David Tedeschi. Implementation of the Polarized HD target at the Thomas Jefferson National Accelerator Facility. United States. doi:10.2172/898823.
Chaden Djalali, and David Tedeschi. Tue . "Implementation of the Polarized HD target at the Thomas Jefferson National Accelerator Facility". United States. doi:10.2172/898823. https://www.osti.gov/servlets/purl/898823.
@article{osti_898823,
title = {Implementation of the Polarized HD target at the Thomas Jefferson National Accelerator Facility},
author = {Chaden Djalali and David Tedeschi},
abstractNote = {The original goal of this proposal was to study frozen spin polarized targets (HD target and other technologies) and produce a conceptual design report for the implementation of such a target in the HALL B detector of the Thomas Jefferson National Accelerator Facility (JLab). During the first two years of the proposal, we came to the conclusion that the best suited target for JLab was a frozen spin target and helped with the design of such a target. We have not only achieved our original goal but have exceeded it by being involved in the actual building and testing of parts the target. The main reason for this success has been the hiring of a senior research associate, Dr. Oleksandr Dzyubak, who had more than 10 years of experience in the field of frozen spin polarized targets. The current grant has allowed the USC nuclear physics group to strengthen its role in the JLab collaboration and make important contribution to both the detector development and the scientific program.},
doi = {10.2172/898823},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 30 00:00:00 EST 2007},
month = {Tue Jan 30 00:00:00 EST 2007}
}

Technical Report:

Save / Share:
  • The Thomas Jefferson National Accelerator Facility (Jefferson Lab) has been funded by the US Navy to build an infra-red FEL driven by an energy-recovering compact SRF-based linear accelerator. The machine is to produce a 1 kW IR photon beam. The Jefferson Lab Accelerator Division is presently engaged in detailed design and beam dynamics studies for the driver accelerator. Principle beam dynamics and beam transport considerations include: (1) generation and transport of a high-quality, high-current, space-charge dominated beam; (2) the impact of coherent synchrotron radiation (CSR) during beam recirculation transport; (3) low-loss transport of a large momentum spread, high-current beam; (4)more » beam break up (BBU) instabilities in the recirculating accelerator; (5) impedance policing of transport system components; and (6) RF drive system control during energy recovery and FEL operation.« less
  • In this environmental assessment (EA), the US Department of Energy (DOE) reports the results of an analysis of the potential environmental impacts from a proposed change in operating parameters of the Continuous Electron Beam Accelerator Facility (CEBAF), and operation of the Free Electron Laser (FEL) facility beyond the initial demonstration period. With this proposal, DOE intends to increase CEBAF operating range from its current operating maximum beam energy of 4.0 GeV [giga-(billion) electron volts] to 8.0 GeV at a beam power of no greater than 1,000 kW [1 megawatt (MW)], its maximum attainable level, based on current technology and knowledge,more » without significant, costly equipment modifications. DOE has prepared an EA for this action to determine the potential for adverse impacts from operation of CEBAF and the FEL at the proposed levels. Changing the operating parameters of CEBAF would require no new major construction and minor modifications to the accelerator, its support systems, the FEL, and onsite utility systems. Modifications and performance improvements would be made to (1) the accelerator housed in the underground tunnels, (2) its support systems located in the above ground service buildings, and (3) the water and equipment cooling systems both in the tunnel and at the ground surface. All work would be performed on previously disturbed land and in, on, or adjacent to existing buildings, structures, and equipment. With the proposed action, the recently constructed FEL facility at the Jefferson Lab would operate in concert with CEBAF beyond its demonstration period and up to its maximum effective electron beam power level of 210 kW. In this EA, DOE evaluates the impacts of the no-action alternative and the proposed action alternative. Alternatives considered, but dismissed from further evaluation, were the use of another accelerator facility and the use of another technology.« less
  • Jefferson Lab contributes to the Department of Energy mission to develop and operate major cutting-edge scientific user facilities. Jefferson Lab's CEBAF (Continuous Electron Beam Accelerator Facility) is a unique tool for exploring the transition between the regime where strongly interacting (nuclear) matter can be understood as bound states of protons and neutrons, and the regime where the underlying fundamental quark-and-gluon structure of matter is evident. The nature of this transition is at the frontier of the authors understanding of matter. Experiments proposed by 834 scientists from 146 institutions in 21 countries await beam time in the three halls. The authorsmore » user-customers have been delighted with the quality of the data they are obtaining. Driven by their expressed need for energies higher than the 4 GeV design energy and on the outstanding performance of their novel superconducting accelerator, the laboratory currently delivers beams at 5.5 GeV and expects to deliver energies approaching 6 GeV for experiments in the near future. Building on the success of Jefferson Lab and continuing to deliver value for the nation's investment is the focus of Jefferson Lab's near-term plans. The highest priority for the facility is to execute its approved experimental program to elucidate the quark structure of matter. The Lab plans to participate in the Strategic Simulation Initiative and benefit from the scientific opportunities that it affords. Initially, the lab will contribute its expertise in simulations for nuclear theory and accelerators, data handling, and distributed systems. As part of its SSI activities, the lab is planning to enhance its expertise in lattice QCD and simulations of photon-driven materials and chemical processes.« less
  • The U. S. Department of Energy (DOE), in this Environmental Assessment (EA), reports the results of an analysis of the potential environmental impacts from the proposed construction of various site improvements and the proposed installation and operation of the Helios light source at the Thomas Jefferson National Accelerator Facility (Jefferson Lab) in Newport News, Virginia. Jefferson Lab is operated by the Southeastern Universities Research Association, Inc. (SURA) under contract to DOE. With this proposal, DOE intends to construct no more than four major two or three story additions totaling about 151,000 sq. ft. (square feet) to CEBAF Center, the mainmore » facility administration building, and the addition of three new single story and one two story operations support structures on the accelerator site. The structures are a 28,000 sq. ft. storage building, a 15,100 sq. ft. technical support building, a 3,500 sq. ft. refrigeration service building, and a two-story 22,600 sq. ft addition to the Free Electron Laser (FEL) facility. The proposed action also involves the installation and operation of the Helios (High-Energy Lithography Source) accelerator in the FEL Addition. DOE proposes to take this action to provide Jefferson Lab with improved staff and operations support facilities that, along with the operation of Helios, will provide an increased capability to facilitate accelerator and physics program operations. Support activities necessary to effect the installation and operation of Helios would begin in Fiscal Year (FY) 03. It is expected that the Helios machine should be available to serve developmental and operational activities in support of the physics program later in FY 04. In this EA, DOE presents the no action alternative, alternatives considered and dismissed, and the proposed action alternative. It also evaluates the impacts of each.« less
  • The authors describe the design and implementation of a C++ client/server based slow orbit and energy control package based on the CDEV software control bus. Several client applications are described and operational experience is given.