| 1. |
- Cenni, Enrico, et al.
(author)
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Vertical test results on ESS medium beta elliptical cavity prototype
- 2016
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In: Proceedings of the 28th Linear Accelerator Conference, LINAC 2016. - 9783954501694 ; , s. 631-633
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Conference paper (peer-reviewed)abstract
- The ESS elliptical superconducting Linac consists of two types of 704.42 MHz cavities, medium and high beta, to accelerate the beam from 216 MeV (spoke cavity Linac) up to the final energy of 2 GeV. The last Linac optimization, called Optimus+ [1], has been carried out taking into account the limitations of SRF cavity performance (field emission). The medium and high-beta parts of the Linac are composed of 36 and 84 elliptical cavities, with geometrical beta values of 0.67 and 0.86 respectively. This work presents the latest vertical test results on ESS medium beta elliptical cavity prototypes. We describe the cavity preparation procedure from buffer chemical polishing to vertical test. Finally, magnetic probes (Fluxgate) were installed on the cavity to determine magnetic field background during vertical test. The latest vertical test results showed that the cavity design performance is beyond requirements.
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| 2. |
- Darve, C., et al.
(author)
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The superconducting radio-frequency linear accelerator components for the European spallation source : First test results
- 2016
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In: Proceedings of the 28th Linear Accelerator Conference, LINAC 2016. - 9783954501694 ; , s. 651-656
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Conference paper (peer-reviewed)abstract
- The European Spallation Source requires a pulsed linac with an average beam power on the target of 5 MW, which is about five times higher than the most powerful spallation source in operation today. Over 97 % of the acceleration occurs in superconducting cavities. ESS will be the first accelerator to employ double spoke cavities to accelerate beam. Accelerating gradients of 9 MV/meter is required in the spoke section. The spoke section will be followed by 36 elliptical 704 MHz cavities with a geometrical E of 0.67 and elliptical 704 MHz cavities with a geometrical E of 0.86. Accelerating gradients of 16.7 and 20 MV/m are required in the medium and high-E elliptical cavities, respectively. Initial gradient test results will be presented in which results exceed expected requirements.
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| 3. |
- de Prisco, Renato, et al.
(author)
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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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In: LINAC16 28th Linear Accelerator Conference. - 9783954501694 ; , s. 290-290
-
Conference paper (peer-reviewed)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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| 4. |
- de Prisco, Renato, et al.
(author)
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Integration of Interfaces and Stabilization System in the Design of a Drift Tube Linac
- 2016
-
In: LINAC16 28th Linear Accelerator Conference. - 9783954501694 ; , s. 294-294
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Conference paper (peer-reviewed)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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| 5. |
- Olsson, D., et al.
(author)
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Commissioning status of the chopper system for the Max IV injector
- 2016
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In: Proceedings of the 28th Linear Accelerator Conference, LINAC 2016. - 9783954501694 ; , s. 468-471
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Conference paper (peer-reviewed)abstract
- The MAX IV facility in Lund, Sweden consists of two storage rings for production of synchrotron radiation, and a short-pulse-facility (SPF). The two rings are designed for 3 GeV and 1.5 GeV, respectively, where the initial beam commissioning of the former has recently been completed, and commissioning of the latter was started in September 2016. Both rings will be operating with top-up injections delivered by a full-energy injector. In order to reduce losses of high-energy electrons along the injector and in the rings during injection, only electrons that are within a time structure where they can be accumulated in the ring buckets are accelerated. Electrons outside this time structure are dumped before they reach the first LINAC structure by a chopper system. The performance of the chopper system during commissioning of the 3 GeV ring is presented in this paper.
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