PRELIMINARY DATA
RF Cavity Parameters
The data in this table may be revised occasionally. Please check back often.
PRELIMINARY DATA
| Parameter | Value |
|---|---|
| Beta | 0.87 (pz=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 | 13.5 cm |
| Average Accelerating Gradient | 11.2 MV/m |
| Peak Accelerating Field | 13.25 MV/m |
| Peak Surface Field | 22.53 MV/m |
| Kilpatrick Limit | 14.8 MV/m |
| Cavity Type | Open cell with crossed tubes over aperture |
| Number of Cells per Cavity | 2 |
| 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 0.864m. Two coaxial lines feed the cavities from room temperature (warm bore) ports, 0.17m diameter, passing through the magnet cryostat. |
| Impedance | 25.5 Mohm/m (no transit time correction, Z=V2/(P*d)) |
| Shunt Impedance | ZT2=18.2 Mohm/m, 7.86 Mohm per cell |
| Transit Time Factor T | 0.845 |
| Peak Voltage per Cell | 5.7 MV |
| Voltage per cell | 4.8 MV |
| Qo | 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 | 6.8 MW/m |
| Peak Power per Cell | 2.9 MW |
| Average Power per Cell | 6.7 kW |
| Window Type | 4 cm diameter Al crossed tubes |
| Average Power On Tubes | 25 W (worst tube) |
| Conductivity Al/Cu | 3.72x107 / 5.8x107 S/m |
| Skin Depth | 4.6 microns (Cu), 5.8 microns (Al) |
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