RF Cavity Parameters

Beam Aperture (Diameter) 64 cm.

2Pi/3 phase advance per cell

The data in this table may be revised occasionally. Please check back often.

** PRELIMINARY DATA **

Parameter |
Value |
---|---|

Beta |
0.87 (p_{z}=187 MeV/c) |

Energy Loss Factor in Hydrogen |
0.303 MeV/cm |

Frequency |
201.25 MHz |

Accelerating Phase Angle |
sin(25 ^{o}) |

Hydrogen Absorber Length |
30 cm |

Average Accelerating Gradient |
9.95 MV/m |

Peak Accelerating Field |
11.8 MV/m |

Peak Surface Field |
18.2 MV/m |

Kilpatrick Limit |
14.8 MV/m |

Cavity Type |
Open cell with crossed tubes over aperture |

Number of Cells per Cavity |
5 |

Cavity Dimensions |
The internal radius is 0.600m, determined by
MAFIA calculations. The internal cell length, lambda*beta/3, is
0.432m. The length of an accelerating section is 2.16m.
Five coaxial lines feed
the cavities from room temperature (warm bore) ports, 0.17m diameter,
passing through the magnet cryostat. |

Impedance |
24 Mohm/m (no transit time correction, Z=V^{2}/(P*d)) |

Shunt Impedance |
ZT^{2}=17.0 Mohm/m, 7.34 Mohm per cell |

Transit Time Factor T |
0.845 |

Peak Voltage per Cell |
5.1 MV |

Voltage per cell |
4.3 MV |

Q_{o} |
47,500 |

Fill Time |
38 microseconds, critically coupled (one fill time) |

Bunch Length (sigma) |
10 cm |

Number of Bunches in Train |
30 |

Bunch Train Length |
150 ns |

RF pulse |
114 microseconds |

Duty Cycle |
2.34x10^{-3} |

Peak Power Requirement |
(11.8x10^{6})^{2}/24x10^{6} = 5.8 MW/m |

Peak Power per Cell |
(5.8/5)x2.16 = 2.5 MW |

Average Power per Cell |
2.5 MW x 2.34x10^{-3} = 5.85 kW |

Window Type |
4 cm diameter Al crossed tubes |

Average Power On Tubes |
73 W (worst tube) |

Conductivity Al/Cu |
3.72x10^{7} / 5.8x10^{7} S/m |

Skin Depth |
4.6 microns (Cu), 5.8 microns (Al) |