Reduction of Beam Emittance of Pep-X Using Quadruple Bend Achromat Cell

Conference · Tue May 26 04:00:00 EDT 2009

OSTI ID:953502

Wang, Min-Huey; Cai, Yunhai; Hettel, Robert; Nosochkov, Yuri

SLAC National Accelerator Laboratory is studying an option of building a high brightness synchrotron light source machine, PEP-X, in the existing PEP-II tunnel [1, 2]. By replacing 6 arcs of FODO cells of PEPII High Energy Ring (HER) with two arcs of DBA and four arcs of TME and installation of 89.3 m long damping wiggler an ultra low beam emittance of 0.14 nm-rad (including intra-beam scattering) at 4.5 GeV is achieved. In this paper we study the possibility to further reduce the beam emittance by releasing the constraint of the dispersion free in the DBA straight. The QBA (Quadruple Bend Achromat) cell is used to replace the DBA. The ratio of outer and inner bending angle is optimized. The dispersion function in the non-dispersion straight is controlled to compromise with lower emittance and beam size at the dispersion straight. An undulator of period length 23 mm, maximum magnetic field of 1.053 T, and total periods of 150 is used to put in the 30 straights to simulate the effects of these IDs on the beam emittance and energy spread. The brightness including all the ID effects is calculated and compared to the original PEP-X design.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 953502
• Report Number(s): SLAC-PUB-13629
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
Other
ACCPHY
SYNCHRAD
BEAM EMITTANCE
BEAMS
BENDING
BRIGHTNESS
DAMPING
DESIGN
FERMILAB ACCELERATOR
LIGHT SOURCES
MAGNETIC FIELDS
PARTICLES
REDUCTION
SCATTERING
SIZE
STANFORD LINEAR ACCELERATOR CENTER
STORAGE RINGS
SYNCHROTRONS
TUNNELS
WIGGLER MAGNETS