# LET Magnets

### Drawings

### Tables

LTP (Linac to PAR) Transport
Line

PTB (PAR to Booster) Transport Line

**2.2 LTP (Linac to PAR) Transport Line**

The first section of the 450-MeV positron beam transport line from the positron linac to the PAR contains 10 quadrupoles and one bending dipole.

Parameters of the low energy transport line between linac and PAR are given below.

**2.2.1 Magnets**

Dipoles |
||

Number | 1 | |

Magnetic Length | 0.4 | m |

Bending Angle | 0.2 | rad |

Field | 0.75 | T |

Quadrupoles |
||

Number | 10 | |

No. of independent power supplies | 10 | |

Magnetic Length | 0.3 | m |

Max gradient | 12.7 | T / m |

Pole tip inscribed radius | 32 | mm |

**2.2.2 Beam Diagnostics (number of
each type)**

Current monitor | 1 |

Position monitors | 4 per plane |

Loss monitor | 1 |

Fluorescent screens | 3 |

**LTP parameters for beam diagnostics**

Peak Current (linac output) | 8 | mA |

Bunch length (from linac) | 30 | ns |

Intensity per pulse | 1.5 x 10^{9} |
e^{+} |

Charge per pulse | 240 | pC |

Number of pulses | 24 | |

Pulse repetition rate | 60 | Hz |

**2.4 PTB (PAR to Booster) Transport Line**

The second section of the 450-MeV positron beam transport line from the PAR to the injector synchrotron (also known as booster) contrains 11 quadrupoles and two horizontal bends. The two bends in opposite polarities form an achromatic horizontal parallel translation together with four quadrupoles.

Parameters of the low energy transport line from PAR to injector synchrotron (or booster) are given below.

**2.4.1 Magnets**

Dipoles |
||

Number | 2 | |

No. of independent power supplies | 2 | |

Magnetic Length | 0.4 | m |

Bending angle | 0.2 | rad |

Field | 0.75 | T |

Bending angle | 0.187 | rad |

Field | 0.703 | T |

Quadrupoles |
||

Number | 11 | |

No. of independent power supplies | 11 | |

Magnetic length | 0.3 | m |

Max gradient | 12.7 | T / m |

Pole tip inscribed radius | 32 | mm |

**2.4.2 Beam Diagnostics (number of
each type)**

Current monitor | 1 |

Position monitors | 5 per plane |

Loss monitor | 1 |

Fluorescent screens | 3 |

**PTB parameters for beam diagnostics**

Peak current (assume Gaussian bunch) | 7.92 | A |

Bunch length (from the PAR) | 0.29 | ns |

Intensity per bunch, at 100% efficiency | 3.6 x 10^{10} |
e^{+} |

Charge per pulse, at 100% efficiency | 5.76 | nC |

Pulse repetition rate | 2 | Hz |