scholarly journals The CEBAF (Continuous Electron Beam Accelerator Facility) fast shutdown system

1990 ◽  
Author(s):  
J. Perry ◽  
E. Woodworth
Keyword(s):  
Electron Beam ◽  
Accelerator Facility

Design studies for the next generation electron ion colliders

2014 ◽  
Vol 29 (09) ◽  
pp. 1450053
Author(s):  
Hisham Kamal Sayed ◽  
S. A. Bogacz ◽  
G. Krafft
Keyword(s):  
Electron Beam ◽  
Numerical Study ◽  
Polarization Vector ◽  
Beam Polarization ◽  
Straight Section ◽  
Next Generation ◽  
Interaction Point ◽  
Accelerator Facility ◽  
Electron Ring ◽  
Betatron Motion

The next generation Electron Ion Collider (EIC) at Thomas Jefferson National Accelerator Facility (JLAB) utilizes a figure-8 shaped ion and electron rings. EIC has the ability to preserve the ion polarization during acceleration, where the electron ring matches in footprint with a figure-8 ion ring. The electron ring is designed to deliver a highly polarized high luminous electron beam at interaction point (IP). The main challenges of the electron ring design are the chromaticity compensation and maintaining high beam polarization of 70% at all energies 3–11 GeV without introducing transverse orbital coupling before the IP. The very demanding detector design limits the minimum distance between the final focus quadrupole and the interaction point to 3.5 m which results in a large β function inside the final focus quadrupoles leading to increased beam chromaticity. In this paper, we present a novel chromaticity compensation scheme that mitigates IP chromaticity by a compact chromaticity compensation section with multipole magnet components. In addition, a set of spin rotators are utilized to manipulate the polarization vector of the electron beam in order to preserve the beam polarization. The spin rotator solenoids introduce undesired coupling between the horizontal and vertical betatron motion of the beam. We introduce a compact and modular orbit decoupling insert that can fit in the limited space of the straight section in the figure-8 ring. We show a numerical study of the figure-8 ring design with the compact straight section, which includes the interaction region, chromaticity compensation section, and the spin rotators, the figure-8 design performance is evaluated with particle tracking.

RECENT STRUCTURE BASED HIGH GRADIENT WAKEFIELD EXPERIMENTS AT ARGONNE

2007 ◽  
Vol 21 (03n04) ◽  
pp. 372-377
Author(s):  
W. GAI ◽  
M. E. CONDE ◽  
F. GAO ◽  
C. JING ◽  
R. KONECNY ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electron Beam ◽  
Output Coupler ◽  
High Field ◽  
Bunch Length ◽  
Accelerator Facility ◽  
Dielectric Tube ◽  
Electron Bunches ◽  
Dielectric Structures ◽  
Wakefield Accelerator

Dielectric structures promise to support high field, especially for short wakefield pulses produced by a high charged electron beam traveling in a dielectric tube. To push the gradient higher, we have tested two structures using recent upgraded Argonne wakefield accelerator facility that capable of producing up to 100 nC charge and bunch length of < 13 ps (FWHM). Here we report on the experiment results that more than 80 nC beam passes through a 14 GHz dielectric loaded wakefield structure that produced an accelerating field of ~ 45 MV/m . The two structures consist of a cylindrical ceramic tube (cordierite) with a dielectric constant of 5, inner and outer radii of 5 mm and 7.49 mm, respectively, and with length of 102 mm and 23 mm long. We present measurements made with single electron bunches and also with two bunches separated by 1.5 ns. As a next step in these experiments, another structure, with an output coupler, has been designed and is presently being fabricated.

NUCLEON SPIN PHYSICS USING CEBAF AT 11 GeV

2003 ◽  
Vol 18 (08) ◽  
pp. 1281-1288
Author(s):  
ZEIN-EDDINE MEZIANI
Keyword(s):  
Electron Beam ◽  
Nucleon Spin ◽  
Accelerator Facility ◽  
Spin Physics ◽  
Jefferson Lab ◽  
Polarized Target ◽  
Polarized Beam

We disscuss key experiments that address some of the nucleon spin physics questions as part of the 12 GeV planning for the energy upgrade of the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab. These experiments take advantage of a highly polarized beam and the availability of polarized target namely 3 He combined with a Medium Acceptance Spectrometer (MAD) in Hall A.

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