Tetrode based technology demonstrator at 352 MHz, 400 kWp for ESS spoke linac

Yogi, Rutambhara; Wedberg, Rolf; Hermansson, Lars; Gajeski, Konrad; Montesinos, Eric; Ziemann, Volker; Ekelöf, T.; Ruber, Roger

doi:10.1109/ivec.2014.6857516

Cited by 4 publications

(5 citation statements)

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“…One of the signal channels incorporates amplitude regulation and the other phase regulation to balance the signal amplitude and phase at the output of the amplifier chains. Then the signals pass through solid-state amplifiers A1 and A2 followed by amplifiers SSA1 and SSA2 [22]. The combined amplification of these solid-state amplifiers is in the order of 70 dB reaching a signal level around 10 kW.…”

Section: Rf Power Stationsmentioning

confidence: 99%

“…An initial survey revealed that the most suitable tetrode tube available was the TH595 [23]. It can operate at power levels up to 200 kW in pulsed mode with a gain of 15 dB and an efficiency of 65%.…”

Section: Rf Power Stationsmentioning

confidence: 99%

“…The peak and average power levels for the 352 MHz RF power stations are such that coaxial transmission lines can be used, visible as the copper tubes on top of the RF stations in figure 9. These are 6-1/8 inch coaxial lines as compared to more bulkier 23 inch wide (half-height WR2300) waveguide transmission lines chosen for example for the ESS accelerator tunnel [26]. A coaxial circulator for 400 kW peak power was prototyped and is now also used at ESS.…”

Section: Rf Power Distributionmentioning

confidence: 99%

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Accelerator development at the FREIA Laboratory

et al. 2021

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The FREIA Laboratory at Uppsala University focuses on superconducting technology and accelerator development. It actively supports the development of the European Spallation Source, CERN, and MAX IV, among others. FREIA has developed test facilities for superconducting accelerator technology such as a double-cavity horizontal test cryostat, a vertical cryostat with a novel magnetic field compensation scheme, and a test stand for short cryomodules. Accelerating cavities have been tested in the horizontal cryostat, crab-cavities cavities in the vertical cryostat, and cryomodules for ESS on the cryomodule test stand. High power radio-frequency amplifier prototypes based on vacuum tube technology were developed for driving spoke cavities. Solid-state amplifiers and power combiners are under development for future projects. We present the status of the FREIA Laboratory complemented with results of recent projects and future prospects.

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Section: Rf Power Stationsmentioning

confidence: 99%

Section: Rf Power Stationsmentioning

confidence: 99%

Section: Rf Power Distributionmentioning

confidence: 99%

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Accelerator development at the FREIA Laboratory

et al. 2021

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“…Each RF power station [36] will be realized combining two equivalent transmitters with a 3 dB hybrid combiner. The RF amplification chain of each transmitter is composed of a 7 kW pre-amplifier followed by a 210 kW tetrode as main amplification stage, see Fig.…”

Section: Rf Power Stationsmentioning

confidence: 99%

“…For the main amplification stage, the tube adopted is a tetrode TH595A from Thales. This tube is capable of providing 210 kW at the required frequency and duty The design choices for the RFPS [36] took into account, in addition to the tight specifications of stability and reproducibility of the RF pulse, the fundamental requirement of high reliability needed for a user facility as ESS and of high efficiency, that is to minimize power consumption, addressing one of the basic challenges of a sustainable machine. For these reasons, starting from the beginning, RAMI (Reliability, Availability, Maintainability and Inspectability) concepts have been incorporated in the design.…”

Section: Rf Power Stationsmentioning

confidence: 99%

The Italian contribution to the construction of the linac for the European spallation source

2021

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The European spallation source (ESS) uses a linear accelerator (linac) to deliver the high intensity proton beam to the target station for producing intense beams of neutrons. At the exit of the linac, the proton beam will have 2 GeV energy and 62.5 mA current. The construction of an accelerator with the contribution of different laboratories is not a new concept but so far the laboratories were controlled by the same government (e.g. in USA and Japan) or they delivered components for an intergovernmental institution like CERN. The European Spallation Source is a research facility that gathers 40 active in-kind (IK) contributors from 13 States, even outside the European Union, so its construction is not only a technical and scientific challenge, but also an economic, political and social experiment. The case of the Italian contribution is interesting because of the structure of Italian industrial ecosystem, mostly based on small and medium-sized enterprises (SME), which may be unsuitable for the case of a research infrastructure which construction requires a high level of R&D investments. Conversely, the well-known flexibility of SME to adapt to the requirements have balanced the weakness and the results are satisfactory. Following the overview of the Linac design, the paper will focus on the key issues of the Italian contribution, the state of the project (73% completion up to now) along with the point of view of the ESS management and the lesson learnt; the major outcomes for the economy and society will complete the discussion.

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