| 1. |
- Eriksson, Mikael, et al.
(författare)
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MAX-IV Design: Pushing the Envelope
- 2007
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Ingår i: 2007 IEEE Particle Accelerator Conference, vols 1-11. - 9781424409167 ; , s. 1277-1279
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Konferensbidrag (refereegranskat)abstract
- The proposed MAX IV facility is meant as a successor to the existing MAX-lab. The accelerator part will consist of three storage rings, two new ones operated at 3 and 1.5 GeV respectively and the existing 700 MeV MAX III ring. The two new rings have identical lattices and are placed on top of each other. Both these rings have a very small emittance, 0.86 and 0.4 nm rad respectively, and offer synchrotron radiation of very high mean brilliance. As an injector, a 3 GeV linear accelerator is planned. The design philosophy and the special technical solutions called for are presented in this paper.
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| 2. |
- Ferrari, Arnaud
(författare)
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New concept for a CLIC post-collision extraction line
- 2007
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Ingår i: 2007 IEEE Particle Accelerator Conference. - Piscataway, NJ : IEEE conference proceedings. - 9781424409167 ; , s. 2835-2837
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Strong beam-beam effects at the interaction point of a high-energy e+e- linear collider such as CLIC lead to an emittance growth for the outgoing beams, as well as to the production of beamstrahlung photons and e+e- coherent pairs. We present a conceptual design of the post-collision line for CLIC at 3 TeV, which separates the various components of the outgoing beam in a vertical magnetic chicane and then transports them to their respective dump.
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| 3. |
- Hoa, C., et al.
(författare)
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Parametric study of heat deposition from collision debris into the insertion superconducting magnets for the LHC luminosity upgrade
- 2007
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Ingår i: IEEE Particle Accelerator Conference, PAC07. - 9781424409167 ; , s. 323-325
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Konferensbidrag (refereegranskat)abstract
- With a new geometry in a higher luminosity environment, the power deposition in the superconducting magnets becomes a critical aspect to analyze and to integrate in the insertion design. In this paper, we quantify the power deposited in magnets insertion at variable positions from the interaction point (IP). A fine characterization of the debris due to the proton-proton collisions at 7 TeV, shows that the energetic particles in the very forward direction give rise to non intuitive dependences of the impacting energy on the magnet front face and inner surface. The power deposition does not vary significantly with the distance to the interaction point, because of counterbalancing effects of different contributions to power deposition. We have found out that peak power density in the magnet insertion does not vary significantly with or without the Target Absorber Secondaries (TAS) protection.
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| 4. |
- Jones, F. W., et al.
(författare)
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Simulation of decays and secondary ion losses in a betabeam decay ring
- 2007
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Ingår i: IEEE Particle Accelerator Conference, PAC07. - 9781424409167 ; , s. 3232-3234
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Konferensbidrag (refereegranskat)abstract
- Radioactive ions injected into the decay ring of a Betabeam neutrino facility will constitute a continuous source of decay products distributed around the ring. Secondary ions from beta decays will differ in charge state from the primary ions and will follow widely off-momentum orbits. In the racetrack configuration of the ring, they will be mismatched in the long straights and may acquire large amplitudes, but the great majority of losses will be in the arcs. We describe here a comprehensive model of ion decay, secondary ion tracking, and loss detection, which has been implemented in the tracking and simulation code Accsim. Methods have been developed to accurately follow ion trajectories at large momentum deviations as well as to detect their impact coordinates on vacuum chamber walls and possibly inside magnetic elements. Using secondary-ion data from Accsim and post-processing with Mathematica, we have implemented a follow-on simulation in FLUKA with a 3D geometry of decay ring components and physics models for ion interactions in matter, allowing radiological studies and in particular the visualization and analysis of heat deposition in the dipole magnets which is a critical design factor for the ring. In our simulations we have also implemented absorber elements which are intended to localize the majority of losses outside of the dipoles. These studies provide estimates of ring performance (in terms of loss concentration and management), the effectiveness of absorbers, and the implications for successful superconducting dipole operation.
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| 5. |
- Latina, Andrea, et al.
(författare)
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Beam dynamics studies in the CLIC Injector Linac
- 2007
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Ingår i: Particle Accelerator Conference 2007, Albuquerque, USA, June 2007. - 9781424409167 ; , s. 2838-2840
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Wildner, Elena, et al.
(författare)
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A large aperture superconducting dipole for beta beams to minimize heat deposition in the coil
- 2007
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Ingår i: IEEE Particle Accelerator Conference, PAC07. - 9781424409167 ; , s. 365-367
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Konferensbidrag (refereegranskat)abstract
- The aim of beta beams in a decay ring is to produce highly energetic pure electron neutrino and anti-neutrino beams coming from b-decay of 18Ne10+ and 6He2+ ion beams. The decay products, having different magnetic rigidities than the main ion beam, are deviated inside the dipole. The aperture and the length of the magnet have to be optimized to avoid that the decay products hit the coil. The decay products are intercepted by absorber blocks inside the beam pipe between the dipoles to protect the following dipole. A first design of a 6T arc dipole using a cosine theta layout of the coil with an aperture of 80 mm fulfils the optics requirements. Heat deposition in the coil has been calculated using different absorber materials to find a solution to efficiently protect the coil. Aspects of impedance minimization for the case of having the absorbers inside the beam pipe have also been addressed.
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| 7. |
- Wildner, Elena
(författare)
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Magnet acceptance and allocation at the LHC magnet evaluation board
- 2007
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Ingår i: IEEE Particle Accelerator Conference, PAC07. - 9781424409167 ; , s. 3739-3741
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Konferensbidrag (refereegranskat)abstract
- The normal and superconducting magnets for the LHC ring have been carefully examined to insure that each of about 1900 assemblies is suitable for the operation in the accelerator. Hardware experts and accelerator physicists have contributed to this work that consisted in magnet acceptance, and sorting according to geometry, field quality and quench level. This paper gives a description of the magnet approval mechanism that has been running since four years, reporting in a concise summary the main results achieved.
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| 8. |
- Wildner, Elena, et al.
(författare)
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Processing magnet geometry measurements for better control of LHC aperture
- 2007
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Ingår i: IEEE Particle Accelerator Conference, PAC07. - 9781424409167 ; , s. 362-364
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Konferensbidrag (refereegranskat)abstract
- The Large Hadron Collider superconducting axes of the magnet are measured from both ends. These two redundant measurements are combined to get a reliable measurement result. When the two measurements are put together, we observe a "saw tooth" effect due to the fact that the two measurements are, in general, not identical. This is expected from the accuracy of the two measurements. However the effect observed, in the vertical plane, is considerably larger than expected. Effects of temperature gradients in the cold bore tube during measurements have been observed and we show that this effect is the most probable explanation for the observations of the large differences in the measurements between the two sides. This work proposes an algorithmic approach to filter this effect to improve measurement results. Magnets are positioned with an accuracy of 0.1 mm, and the error in positioning coming from measurement errors due to the temperature effects can be up to 0.3 mm. Our analysis shows that by applying this correction we can assure the best positioning of the magnets in the tunnel in the vertical plane. Analysis is done for the 15 in long main dipoles, for which the effect is most visible.
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