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The Low Energy Ion Ring (LEIR) is a central piece of the injector chain for LHC ion operation, transforming long Linac 3 pulses into high density bunches needed for LHC. LEIR commissioning is scheduled to be completed at the time of the conference. A review of LEIR commissioning highlighting expected and unexpected problems and actions to tackle th...
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... charge exchange interactions of the circulating ions with rest gas and a relatively high pressure in one section. One notes that the expected gain in life-time by using O 4+ ions was not that significant. Possible reasons for the high pressures are difficulties with recuperated bellows and the fact that parts (found after opening the machine, see Fig. 2) of an ionization profile monitor have been hit by the beam. In addition to these losses with an almost exponential decay of the intensity, fast losses have been observed and were probably caused by instabilities. From Schottky signals, transverse "activity" could be observed in good correlation with these losses. In consequence, ...
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The construction and operation of LHC is, and will remain, the first priority of CERN for many years. However, the proton injectors still deserve attention because of the beams they provide to users other than the LHC, and because of the need to prepare for future upgrades of the LHC luminosity. This is why a study has recently been performed to ev...
The construction of the Large Hadron Collider at CERN is in its final phase, and commissioning with beam is scheduled to begin before the end of 2007. It is now time to prepare for increasing as much as possible the performance of this unique instrument to maximize the benefits for physics. An essential part of the proposed luminosity upgrade plan...
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... The LHC program foresees lead-lead collisions in the spring of 2008 with luminosity up to 10 27 cm -2 s -1 . The Low Energy Ion Ring (LEIR) has undergone a major upgrade [1] in order to prepare these dense bunches of lead ions by the transformation of ion beam pulses from the Linac 3 into short high-brightness bunches using multi-turn injection, cooling and accumulation. ...
The role of the Low Energy Ion Ring, LEIR, is to transform long pulses of lead ions from the Linac 3 to short dense bunches for transfer to the LHC. This is accomplished by the accumulation of up to 4 Linac pulses by electron cooling. In order to non-destructively monitor the cooling performance and determine the accumulated beam characteristics, two prototype ionisation profile monitors have been built and were tested during the LEIR commissioning runs with O4+ and Pb54+ ions in 2006. In this paper we present the results obtained with the prototype monitors, the problems encountered and describe the modifications made for the final design. The modified monitors have been installed on the LEIR machine and are waiting for the next ion run planned in August.
... The LEIR accumulation ring is part of the accelerator chain that will bring heavy ions in collision in the Large Hadron Collider (LHC) and the first stage of its commissioning with beam has been recently completed [1]. ...
... An additional correction, assuming quadrupole effects in other two bending dipoles should be verified with new measurements and preferably with studies about the geometry and field quality of the two magnets. Furthermore, the proper matching of the line was confirmed by the achievement of good injection efficiency into the LEIR ring [1]. ...
The CERN Low Energy Ion Ring (LEIR) commissioning started in the year 2005. O4+and Pb54+ion beams are transferred at 4.2 MeV/nucleon from Linac 3 to LEIR through a low energy transfer line, for which the constraints and the resulting optics design are presented. First trajectory and dispersion measurements agreed only poorly with the theoretical model. Iterations of a refined optics model and further measurements improved the agreement between experimental observations and expectations. In particular, the effect of quadrupole errors in the line dipole magnets is discussed.
