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Jesper Kristensen
+45 72202358
Australian Synchrotron
Description
The complete injection system for the Australian Synchrotron Project including linac, linac to booster (LTB) transport system, booster synchrotron, booster to synchrotron (BTS) beam transport system and all injection and extraction elements.
Data
Energy (GeV)
3,0Injection energy (MeV)
100Emittance (nmrad)
32Repetition rate (Hz)
1Symmetry
4Revolution time (ns)
434Circumference (m)
130.2Bend magnet field (T)
0.44/1.25*Quadrupole families
2Sextupoles
yesBeam current (mA)
5RF frequency(MHz)
500Horizontal tune
9.2Vertical tune
3.25Momentum compaction
0.0098Energy spread (%)
0.094
*Combined function dipoles, BD/BF
Injection system for the Australian Synchrotron Project
Project start 01.2004. Project completion 06.2006.
The injection system for the Australian Synchrotron consists of a linac, a linac to booster bransfer line (LTB), the booster synchrotron itself, and the booster to storage ring transfer line (BTS).
Linac specifications
The linac provides an electron beam at 100 MeV with specifications as in table 1. The linac provides a pulse at a maximum rate of 5 Hz. The acceleration is performed by means of a 3 GHz RF system, but bunching of the beam is at the Booster RF frequency of 500 MHz. Hence each 500 MHz bunch on average consists of three 3 GHz bunches, with 7 % of the electrons in each of bucket 1 and 3 and 85 % in bucket number 2.
Specifications linac
|
Energy |
≥ 100 MeV |
|
Pulse to pulse energy variation |
≤ 0.25 % (rms) |
|
Relative energy spread |
≤ 0.5 % (rms), ± 1.5 % (full width) |
|
Repetition rate |
Adjustable from single shot up to 5 Hz |
|
Normalized emittance (1s) |
≤ 50 π mm mrad in each plane (x,x’) or (y,y’) |
|
End charge in single-bunch mode |
>0.31 nC |
|
End charge in multi-bunch train |
>3.1 nC |
The LTB transports the beam from the linac to the booster. The LTB provides a matched transport, meaning that the LTB is matched at the input to the linac beam and that the LTB provides a beam matched to the optics at the injection point of the booster for both bx, bx’, by, by’, D and D’. The LTB has separate possibilities of matching of dispersion and beta functions in the sense that there are parts of the beam line including quadrupoles with vanishing dispersion and dispersion primed.
The booster accelerates the beam from the injection energy of 100 MeV to a maximum of 3.0 GeV, either as a single bunch or a bunch train of up to 150 ns. The beam current at 3 GeV is in excess of 0.5 mA and 5 mA for the two modes, respectively. The circumference of the Booster is 130.2 m, and the lattice has fourfold super-symmetry with four straight sections for RF, injection, special diagnostics and extraction. The lattice is designed to have many cells with combined-function magnets (dipole, quadrupole and sextupole fields within the same magnet) in order to reach a small emittance of around 30 nm, which is an exceptionally small emittance for such a compact booster synchrotron.
The BTS transports the beam from the booster to the storage ring. The BTS provides a matched transport, meaning that the BTS is matched at the input from the booster and that the BTS provides a beam matched to the optics at the injection point of the storage ring for both bx, bx’, by, by’, D and D’. Similarly to the LTB the BTS has separate possibilities of matching of dispersion and beta functions in the sense that there are parts of the beam line including quadrupoles with vanishing dispersion and dispersion primed.
