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 | 30 cm |
| Average Accelerating Gradient | 11.3 MV/m |
| Peak Accelerating Field | 16.4 MV/m |
| Peak Surface Field | 28.0 MV/m |
| Kilpatrick Limit | 14.8 MV/m |
| Cavity Type | Open cell with crossed tubes over aperture |
| Number of Cells per Cavity | 3 |
| Cavity Dimensions | The internal radius is 0.600m, determined by MAFIA calculations. The internal cell length, lambda*beta/2, is 0.648m. The length of an accelerating section is 1.944m. Three coaxial lines feed the cavities from room temperature (warm bore) ports, 0.17m diameter, passing through the magnet cryostat. |
| Impedance | 35 Mohm/m (no transit time correction, Z=V2/(P*d)) |
| Shunt Impedance | ZT2=16.68 Mohm/m, 10.81 Mohm per cell |
| Transit Time Factor T | 0.69 |
| Peak Voltage per Cell | 10.6 MV |
| Voltage per cell | 7.3 MV |
| Qo | 69,000 |
| Fill Time | 52 microseconds, critically coupled (one fill time) |
| Bunch Length (sigma) | 10 cm |
| Number of Bunches in Train | 30 |
| Bunch Train Length | 150 ns |
| RF pulse | 156 microseconds |
| Duty Cycle | 2.34x10-3 |
| Peak Power Requirement | (16.4x106)2/35x106 = 7.68 MW/m |
| Peak Power per Cell | (7.68/3)x1.944 = 5.0 MW |
| Average Power per Cell | 5.0 MW x 2.34x10-3 = 11.6 kW |
| Window Type | 4 cm diameter Al crossed tubes |
| Average Power On Tubes | 130 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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