High energy beam lines
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High energy beam lines M. Marchetto · R. E. Laxdal
Published online: 10 October 2013 © Springer Science+Business Media Dordrecht 2013
Abstract The ISAC post accelerator comprises an RFQ, DTL and SC-linac. The high energy beam lines connect the linear accelerators as well as deliver the accelerated beams to two different experimental areas. The medium energy beam transport (MEBT) line connects the RFQ to the DTL. The high energy beam transport (HEBT) line connects the DTL to the ISAC-I experimental stations (DRAGON, TUDA-I, GPS). The DTL to superconducting beam (DSB) transport line connects the ISAC-I and ISAC-II linacs. The superconducting energy beam transport (SEBT) line connects the SC linac to the ISAC-II experimental station (TUDA-II, HERACLES, TIGRESS, EMMA and GPS). All these lines have the function of transporting and matching the beams to the downstream sections by manipulating the transverse and longitudinal phase space. They also contain diagnostic devices to measure the beam properties. Keywords ISAC · ISAC-I · ISAC-II · MEBT · HEBT · DSB · SEBT · Pre-buncher · Chopper · Rotator · Stripping foil · Rebuncher
1 Introduction The ISAC post-accelerator comprises a 35.4 MHz RF quadrupole (RFQ) [1] to accelerate beams of A/q ≤ 30 from the source energy of 2 keV/u to 150 keV/u and a post stripper, 106.1 MHz variable energy drift tube linac (DTL) [2] to accelerate ions of A/q ≤ 7 to a final energy between 0.117 MeV/u to 1.8 MeV/u. A 40 MV superconducting linac (SC-Linac) [3] further accelerates beam from 1.5 MeV/u to energies above the Coulomb barrier. All linacs operate cw to preserve beam
ISAC and ARIEL: The TRIUMF Radioactive Beam Facilities and the Scientific Program. M. Marchetto (B) · R. E. Laxdal TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada e-mail: [email protected]
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M. Marchetto, R.E. Laxdal
Fig. 1 ISAC facility overview
intensity. The continuous beam from the source(s) is prebunched before the RFQ at 11.8 MHz the third sub-harmonic of the RFQ. The ISAC high energy beam lines connect the accelerators to each other plus deliver the beam to the experimental end stations (Fig. 1). The accelerators were installed over a period of time and the names of each section are historic. The RFQ and DTL are joined by the medium energy beam transport (MEBT) section. The RFQ and DTL are used in tandem to produce beams for the medium energy experimental area. The beam line between the exit of the DTL and the medium energy experimental stations (DRAGON and TUDA-I) is called the High Energy Beam Transport (HEBT). The RFQ/DTL tandem is also used to produce beams at 1.5 MeV/u for injection into the SC-linac in ISAC-II. The beam is delivered to ISAC-II using an S-shaped transfer line called the DTL to superconducting beam transport line (DSB). The beam line between the SC-linac and the high energy experimental end stations
High energy beam lines
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(TIGRESS, TUDA-II and EMMA) is called the superconducting energy beam transport (SEBT). The ISAC high energy transport lines are composed of magnetic opti
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