CESR Parameters
Several primary operating parameters of CESR are shown below.Basic CESR Parameters
Operating Energy | 4.7 - 5.6 GeV / Beam |
Circumference | 768.43 m, Trev = 2.56 usec, Harmonic# = 1281 |
Bending Radius (number x length) |
87.89 m (62 x 6.57 m, 2 x 1.64 m, 2 x 3.29 m) 31.65 m (8 x 3.24 m) 140.63 m (4 x 2.95 m) 34.82 m (2 x 3.18 m) 58.60 m (4 x 6.57 m) |
Wigglers | 2 each (for synchrotron radiation users) B(pk)=1.2 T, poles=24, period=19.6 cm, K=22 |
Cell Length | No standard cell, each quadrupole is individually optimized. |
Tunes | QX = 10.53, QY = 9.61, QS = 0.052 |
Horiz. beam emittance | 0.2-0.3 mm-mrad @ 5.3 GeV (with wigglers) |
Energy width (sigE/E0) | 0.71 x 10-3 @ 5.3 GeV (with wigglers) |
Bunch length (sigma) | 2.0 cm (with wigglers) |
Beta functions at I.P. | Beta V = 1.9 cm, Beta H = 1.25 m |
Injector | 150/300 MeV linac, 4-8 GeV synchrotron, (2.3 usec pulse width) |
Syn. Rad. Loss | 1.2 MeV/turn @ 5.3 GeV (with wigglers) |
RF Frequency | 499.765 MHz |
RF Complement | 2 RF regions, each with 2 x 5-cell cavities |
Total RF voltage | 5 MV operating, 6 MV available |
A working description (MAD format) of the CESR Optics is available as a plain text file.
CESR Luminosity Performance
These figures are the highest values measured during normal High Energy Physics running with a beam energy of 5.3 GeV. They did not necessarily occur simultaneously.Peak luminosity | 1.25 x 1033 /cm2/sec |
Best integrated luminosity | 73 /pb per day (April 2001) 1520 /pb per month (Dec 2000) 6350 /pb per year (2000) |
Beam current | 365 mA/beam, 36 bunches/beam (2 beams (e+/e-) each with 9 trains of 5 bunches) |
Beam-beam parameter (xi) | 0.062 vert., 0.025 horiz. |
Performance Plots:
CESR Reference papers
- Externally circulated accelerator physics and engineering notes are found in Colliding Beam Notes (CBN)
- An overview of the CESR-CLEO program is presented in CLNS 96/1396 (250 kB ps).
Several conference papers treat CESR design and operation:
- M. Tigner, IEEE NS-24, 1849 (1977) CESR - An Electron Positron Colliding Beam Facility at Cornell
- R. Littauer, IEEE NS-32, 1610 (1985) Multibunch Operation of CESR
- S. Herb, J. Kirchgessner IEEE 87CH2387-9, 130 (1987) Operation of CESR with Permanent Magnet Interaction Region Quadrupoles
- D. Rubin, Proc. of IEEE/APS Particle Accelerator Conference, (1995) CESR Status and Plans (600kB ps)