Cryogenic Distribution System for the ESS Superconducting Proton Linac

Fydrych, J.; Arnold, Philipp; Hees, Wolfgang; Tereszkowski, P.; Wang, X.L.; Weisend, J. G.

doi:10.1016/j.phpro.2015.06.139

Cited by 19 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Cryogenic Systemsmentioning

confidence: 99%

“…As a result, the valve box and entire CDS designs allow for warmup and cool-down of a single cryomodule while keeping the rest of the system at cryogenic temperatures. They also keep very high thermal and mechanical properties within the operation lifetime and tolerate rapid cool-downs and warmups [113].To meet these requirements the valve box contains six cryogenic valves (CV03, CV04, CV05, CV60, CV61 and CV63) and 2 warm valves (CV05 and CV62) as shown at the bottom of figure 62. In the nominal operation conditions CV03 and CV04 are fully open.…”

mentioning

confidence: 99%

See 1 more Smart Citation

The European Spallation Source Design

et al. 2017

View full text Add to dashboard Cite

The ESS Design: Accelerator 6The ESS Design: Target 66The ESS Design: Controls 93The ESS Design: Conventional Facilities 109Physica ScriptaPhys. Scr. 93 (2018) 014001 (121pp) https://doi.org/10. 1088/1402-4896/aa9bff This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercialNoDerivs 3.0 licence. Content from this work may be used under the terms of the Creative Commons Attribution-NonCommercialNoDerivs 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Neutron scattering is a well-developed and extensively used means to get access to fundamental properties of biological matter as well as of physical materials. Until the end of the twentieth century that was mainly practiced with-and limited in performance by-the continuous flux of neutrons from ageing nuclear reactors (e.g. the Institut Laue-Langevin (ILL), the flagship of neutron research in Europe and in the world) [1]). Looking forward to the following two decades, an OECD report published in 1998 diagnosed the foreseeable decrease of the number of operational facilities [2] and the need to progress in performance. Considering the high scientific interest and the increasing importance of the subject for society at large, the report concluded by strongly recommending the construction of next generation neutron sources in America, Europe and Asia. Pulsed spallation neutron sources (SNS) using a proton beam power exceeding 1 MW were specifically mentioned as the most interesting high performance facilities in the future landscape of neutron laboratories.The USA was the first country to follow this advice by building the SNS in the Oak Ridge National Laboratory (ORNL) which started in 2006 [3, 4]. Japan followed in 2009 with the Japan Proton Accelerator Research Centre (J-PARC) in Tokai [5,6]. In Europe, the subject was part of a concerted effort to further develop the European world-leading largescale research infrastructures suite. In 2003, the European Strategy Forum for Research Infrastructures (ESFRI), set up by the Research Ministries of the Member States and associated countries, concluded that a 5 MW long-pulse, single target station layout with nominally 22 'public' instruments was the optimum technical reference design for an European Spallation Source (ESS) that would meet the needs of the European science community in the second quarter of the century [7].Six years later, in 2009, it materialised in a real project with the adoption of the site of Lund (Sweden). A preconstruction phase followed until the end of 2013 during which the design was finalised [8]. Construction then started with the first neutron beams planned to be available in 2019, and the ESS facility to be operational at full performance in 2025.2 Description 2.1 Principle and specifics. The high level parameters of ESS are shown in table 1. As at SNS and J-PARC, neutrons at ESS are produced by spallation, when the 2 GeV protons hit the meta...

show abstract

Section: Cryogenic Systemsmentioning

confidence: 99%

mentioning

confidence: 99%

The European Spallation Source Design

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Part of this CDS is the Cryogenic Distribution Line (CDL) which runs aside the LINAC. It is a multichannel cryoline which includes two cold circuits: a circuit dedicated to the cold mass, with a temperature ranging from 4.0 to 5.2 K; another one for the thermal shields with 40 < T < 53 K. Each of the CDL 43 valve boxes is connected to one cryomodule and manages the cryogenic processes [2]. From the ACCP, cold helium flows from the high beta cryomodules to the lower beta ones.…”

Section: The Ess Machinementioning

confidence: 99%

The ESS Spoke cryomodule and its test valve box

Duthil

Pierens

Reynet

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. The European Spallation Source project aims at being the most powerful neutron source feeding multidisplinary researches. Based on superconducting radiofrequency technologies, the linear accelerator will operate for the first time a 56 meter long section of niobium double Spoke cavities. Paired in 13 cryomodules, each cavity will generate an accelerating pulsed field of 9MV/m. A prototype cryomodule housing two superconducting Spoke cavities and their RF power couplers is now being fabricated and assembled. It provides the cryogenic environment for their operation in a 2K saturated superfluid helium bath: a 50 K thermal shield, a cold magnetic shield, and integrates all the interfaces necessary to be operational within the linac machine. This prototype will be tested in 2016 at IPNO site and then at Uppsala university FREIA facilities. A valve box was designed to take into account the specific features of this prototype cryomodule and of both test sites. This valve box is also considered as a prototype of the cryogenic distribution of the linac Spoke section. This element will then be used for the tests of the series cryomodules.

show abstract

“…For example the LHC cryogenic transfer line QRL, which is 3.3 km in length, includes a DN250 return line (header B) at a pressure of 16 mbar absolute [1]. In currently constructed facilities, such as FRIB or ESS [2,3], the subatmospheric pressure lines are to be made also of DN250 pipes, but their nominal operation pressures are of 31 mbar absolute. Also, the cryogenic systems of the planned large-scale scientific facilities of International Linear Collider and Future Circular Collider will have to recover cold helium vapours via long and large-size subatmospheric lines [4,5].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of temperature stratification in a subatmospheric cold helium line

Fydrych

Pietrowicz

2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. In last decades the technology of superfluid helium has become very advantageous for large-scale scientific facilities dedicated to high-energy physics. Superconducting cavities or magnets are usually immersed in helium baths at a temperature of 1.8 to 2.0 K. This temperature is produced by a JT cycle where the return line works at a subatmospheric pressure of 16 to 31 mbar. The subatmospheric line lengths can reach even several thousand meters. The helium flows in the subatmospheric lines are driven by cold compressors or vacuum pumps. Due to a limited pressure drop requirement the line diameters can exceed even 300 mm. Since the thermal conductivity of the line material is very small and the flow rate at some operation conditions can be much lower than at the normal operating conditions, a thermal stratification in the helium flow can appear together with a significant temperature gradient along the pipe circumference. These phenomena can affect the thermo-hydraulic behaviour of the line as well as the operation of the entire cryogenic system. The paper presents the numerical simulations of cold helium vapour flows in a long straight line. The stratification phenomenon is discussed and the potential temperature gradient in the pipe wall is evaluated.

show abstract

Cryogenic Distribution System for the ESS Superconducting Proton Linac

Cited by 19 publications

References 2 publications

The European Spallation Source Design

The European Spallation Source Design

The ESS Spoke cryomodule and its test valve box

Numerical analysis of temperature stratification in a subatmospheric cold helium line

Contact Info

Product

Resources

About