| 1. |
- Baussan, E., et al.
(författare)
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A very intense neutrino super beam experiment for leptonic CP violation discovery based on the European spallation source linac
- 2014
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Ingår i: Nuclear Physics B. - : Elsevier BV. - 0550-3213 .- 1873-1562. ; 885, s. 127-149
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Tidskriftsartikel (refereegranskat)abstract
- Very intense neutrino beams and large neutrino detectors will be needed in order to enable the discovery of CP violation in the leptonic sector. We propose to use the proton linac of the European Spoliation Source currently under construction in Lund, Sweden, to deliver, in parallel with the spoliation neutron production, a very intense, cost effective and high performance neutrino beam. The baseline program for the European Spoliation Source linac is that it will be fully operational at 5 MW average power by 2022, producing 2 GeV 2.86 ms long proton pulses at a rate of 14 Hz. Our proposal is to upgrade the linac to 10 MW average power and 28 Hz, producing 14 pulses/s for neutron production and 14 pulses/s for neutrino production. Furthermore, because of the high current required in the pulsed neutrino horn, the length of the pulses used for neutrino production needs to be compressed to a few mu s with the aid of an accumulator ring. A long baseline experiment using this Super Beam and a megaton underground Water Cherenkov detector located in existing mines 300-600 km from Lund will make it possible to discover leptonic CP violation at 5 sigma significance level in up to 50% of the leptonic Dirac CP-violating phase range. This experiment could also determine the neutrino mass hierarchy at a significance level of more than 3 sigma if this issue will not already have been settled by other experiments by then. The mass hierarchy performance could be increased by combining the neutrino beam results with those obtained from atmospheric neutrinos detected by the same large volume detector. This detector will also be used to measure the proton lifetime, detect cosmological neutrinos and neutrinos from supernova explosions. Results on the sensitivity to leptonic CP violation and the neutrino mass hierarchy are presented.
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| 2. |
- de Prisco, Renato, et al.
(författare)
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EFFECT OF THE FIELD MAPS ON THE BEAM DYNAMICS OF THE ESS DRIFT TUBE LINAC
- 2015
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Ingår i: ; , s. 3864-3866
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Konferensbidrag (refereegranskat)abstract
- In the beam dynamics design and modelling of the Eu- ropean Spallation Source (ESS) Drift Tube Linac (DTL) simplified models have been used for the focusing and ac- celerating elements. Since the high current requires precise control of the beam to analyze the losses it is useful to per- form the beam dynamics simulations by using accurate field maps of the focusing and accelerating elements. In this pa- per the effects of the 3D-field maps on the beam dynamics of the ESS DTL are presented.
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| 3. |
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| 4. |
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| 5. |
- de Prisco, Renato, et al.
(författare)
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Implication of Manufacturing Errors on the Layout of Stabilization System and on the Field Quality in a Drift Tube Linac - RF DTL Error Study
- 2016
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Ingår i: LINAC16 28th Linear Accelerator Conference. - 9783954501694 ; , s. 290-290
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Konferensbidrag (refereegranskat)abstract
- The field flatness and the layout of the stabilization system in a drift tube linac are strongly dependent on the manufacturing errors that affect the local resonant frequency. In this paper a methodology is presented to study, firstly, the sensitivityof the resonant frequency and of the field flatness to each geometrical parameter of the drift tubes; then a set of tolerances for each parameter is found and a stabilization system layout is defined in order to keep the field flatness within an acceptable limit.
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| 6. |
- de Prisco, Renato, et al.
(författare)
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Integration of Interfaces and Stabilization System in the Design of a Drift Tube Linac
- 2016
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Ingår i: LINAC16 28th Linear Accelerator Conference. - 9783954501694 ; , s. 294-294
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Konferensbidrag (refereegranskat)abstract
- Making an accurate Radio Frequency, RF, design of any accelerating structure is fundamental to ensure that electromagnetic and beam dynamics requirements will be achieved. This is essential for the most complicated accelerating structureslike the Drift Tube Linac, DTL; in this case a meticulous design facilitates the RF commissioning too. In this paper the influence of the interfaces and of the field stabilization system on the RF design is analyzed and an advanced design methodology to mitigate field degradation is presented.
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| 7. |
- Eshraqi, Mohammad, et al.
(författare)
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ESS Linac Beam Physics Design Update
- 2016
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Ingår i: ; , s. 947-950
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Konferensbidrag (refereegranskat)abstract
- The European Spallation Source, ESS, uses a linear accelerator to bombard the tungsten target with the high intensity protons beam for producing intense beams of neutrons. The nominal average beam power of the linac is 5~MW with a peak beam power at target of 125~MW. This paper focuses on the beam dynamics design of the ESS linac and the diagnostics elements used for the tuning of the lattice and matching between sections.
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| 8. |
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| 9. |
- Eshraqi, Mohammad, et al.
(författare)
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The ESS linac
- 2014
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Konferensbidrag (refereegranskat)
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| 10. |
- Holz, Michael
(författare)
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Development of an analytic Beam Model with non-linear Space-Charge Forces and Envelope Stability Studies
- 2019
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Space-charge—the repelling force of same-charged particles—is a major challenge in the development and application of high-current linear accelerators like spallation sources or accumulator rings. Understanding the dynamical behavior of the beam in its presence is imperative to prevent beam loss and subsequent detrimental effects. There are several established methods to examine the beam’s behavior in the presence of space-charge. On one hand, there are fast, analytic methods describing the beam as a collective, thereby describing coherent beam envelope modes. An example of such a method is the widely used, so-called envelope equation. They have been extensively employed in the frame of modeling space-charge in high-current linear and circular accelerators. On the other hand, numerical methods resolve the dynamics of single particles that comprise the beam. These methods include the incoherent dynamics of single particles, but are therefore computationally expensive. The two approaches also reveal adichotomy in particle beam modeling in which the collective beam behavior is contrasted with that of individual particles. In order to complement the established methods, an analytic model for fast parameter studies with non-linear space-charge forces was developed in Paper I. It contains the complete derivation and validation of the model and is valid for Gaussian beam profiles in 4D phase-space. It is furthermore valid for arbitrary beam angles, which allows for e.g. studies of lattice errors due to skewed quadrupoles. The analytic calculation of the space-charge kick to the beam takes the beam angle into account and introduces an additional coupling contribution to the transverse beam oscillations. Using the model developed in Paper I, Paper II examines the stability of beam envelopes in the presence of non-linear space-charge forces. In particular, different lattice errors in a circular accelerator are studied, but space-charge driven resonances are observed as well. The paper also presents a brief study of mismatched beams. In Paper III, the non-linear space-charge model is used to model a beam core in the frame of aparticle-core model. Here, single test particles are placed around the oscillating beam envelope and probe the self-field of the beam core while they co-propagate through an accelerator lattice. The study investigates particle-core and beam halo effects with mismatched beam cores.
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