Positron Source Parameters
These tables are meant to provide a platform for discussions on ILC Positron Sources.
Suggestions, additions, corrections may be addressed to David Schultz.
Last updated 12/8/04.
| ILC Beam Parameters | |||
| case | Baseline | Alternate #1 | |
| Number of bunches per train | 2820 | 5640 | bunches |
| Positrons per bunch - main Linac | 2x1010 | 1x1010 | positrons |
| Bunch spacing | 337 | 168 | ns |
| Train length | 0.95 | 0.95 | ms |
| Train frequency | 5 | 5 | Hz |
| Undulator Positron Source Options | |||
| case | (like US cold) | (like TDR) | |
| Gamma energy (First harmonic cutoff) | 10 | 28 | MeV |
| Average gamma beam power | 222 | 135 | kW |
| Assumed yield e+/e- (into the DR) | 1.5 | 2 | |
| DR acceptance | .01 | .048 | πmr |
| Accepted energy spread | ±20 | ±30 | MeV |
| Power deposited in target | 18 | 5 | kW |
| Percent power deposited in target | 9 | 4 | % |
| Target | 0.4 | 0.4 | RL Ti alloy |
| Undulator parameters | |||
| case | US cold (unpol) | TDR (unpol) | |
| Electron beam energy | 153 | 250 | GeV |
| Electron beam energy loss | 4.9 | 3 | GeV |
| Undulator length | 170 | 100 | m |
| Photon energy | 10.7 | 28 | MeV |
| Undulator type | k=1, helical | k=1, planar | |
| Undulator field | 1.07 | 0.75 | T |
| Undulator period | 1.0 | 1.4 | cm |
| Undulator full gap | 6 | 5 | mm |
| Conventional Positron Source Options | |||
| case | 1 ms train | 2 ms train | |
| Electron energy | 6 | 6 | GeV |
| Average electron beam power | 280 | 280 | kW |
| Electron beam train length | 0.95 | 1.9 | ms |
| Electron bunches separation | 337 | 674 | ns |
| Electrons per bunch | 2x1010 | 2x1010 | electrons |
| Assumed yield (into the DR) | 1 | 1 | |
| DR acceptance | .01 | .01 | πmr |
| Accepted energy spread | ±20 | ±20 | MeV |
| Power deposited in target | 28 | 28 | kW |
| Target | 4.0 | 4.0 | RL W-Re alloy |