Thermal performance analysis and measurements of the prototype cryomodules of European XFEL accelerator—Part II

Wang, X.L.; Barbanotti, S.; Eschke, J.; Jensch, K.; Klos, Ronald; Maschmann, W.; Petersen, B.; Sawlanski, Olaf

doi:10.1016/j.nima.2014.07.045

Cited by 12 publications

(5 citation statements)

References 3 publications

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“…in which the inner shield will operate between 5 K and 8 K, and the outer shield between 40 K and 80 K. The measured thermal performance [22] confirms that the distributed heat inleak at 2 K is indeed negligible. The design study for the ILC project [23] is based on the same cryomodules.…”

Section: Development Of He II Cryostats For Accelerator Systemssupporting

confidence: 60%

Does one need a 4.5 K screen in cryostats of superconducting accelerator devices operating in superfluid helium? lessons from the LHL

Lebrun¹,

Parma²,

Tavian³

2014

AIP Conference Proceedings

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Abstract. Superfluid helium is increasingly used as a coolant for superconducting devices in particle accelerators: the lower temperature enhances the performance of superconductors in high-field magnets and reduces BCS losses in RF acceleration cavities, while the excellent transport properties of superfluid helium can be put to work in efficient distributed cooling systems. The thermodynamic penalty of operating at lower temperature however requires careful management of the heat loads, achieved inter alia through proper design and construction of the cryostats. A recurrent question appears to be that of the need and practical feasibility of an additional screen cooled by normal helium at around 4.5 K surrounding the cold mass at about 2 K, in such cryostats equipped with a standard 80 K screen. We introduce the issue in terms of first principles applied to the configuration of the cryostats, discuss technical constraints and economical limitations, and illustrate the argumentation with examples taken from large projects confronted with this issue, i.e.

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Section: Development Of He II Cryostats For Accelerator Systemssupporting

confidence: 60%

Does one need a 4.5 K screen in cryostats of superconducting accelerator devices operating in superfluid helium? lessons from the LHL

Lebrun¹,

Parma²,

Tavian³

2014

AIP Conference Proceedings

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“…2.5) have achieved the required specifications and are now undergoing design for manufacture and cost. While the RF power source remains fundamentally the same, two cost-effective design variants for transporting the RF microwave power to the accelerator are considered in the baseline: • A more traditional Distributed Klystron Scheme (DKS), where a klystron is used to drive 39 cavities. The klystrons and modulators are distributed along the entire length of the SCRF linacs, in the same tunnel but shielded from the accelerator itself;…”

Section: Superconducting Rf Main Linacsmentioning

confidence: 99%

“…The experience reported with the European XFEL prototypes has highlighted the importance of the assembly procedures in achieving nominal loads, and "training" effects for the most sensitive 2 K environment [39] (Part I Fig. 2.50).…”

Section: 426mentioning

confidence: 99%

The International Linear Collider Technical Design Report - Volume 3.II: Accelerator Baseline Design

Adolphsen

2013

106

135

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“…where c cond = 8.95×10 −8 , c rad = 5.39×10 −10 , N * is the layer density (19 layers/cm) and n MLI is the total number of layers (10). The values for N * and n MLI are based on the European XFEL [18], and the 4.67 in equation ( 9) accounts for a T 0.67 scaling of emissivity from a room temperature value of ε 0 = 0.04. Note that equation ( 9) does not consider the combined emissivity or the outer cylinder geometry.…”

Section: Thermal Radiationmentioning

confidence: 99%

Thermoeconomic cost optimization of superconducting magnets for proton therapy gantries

Teyber¹,

Brouwer²,

Godeke³

et al. 2020

Supercond. Sci. Technol.

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A compact gantry delivering 70-220 MeV protons with fixed field in the superconducting magnets could reduce the cost and improve the adoption of proton therapy. While a number of magnet and cryogenics designs have been proposed, the combined capital and operating costs of state-of-the-art superconducting materials have not been analyzed. In response, we develop a thermoeconomic model of a multi-stage, conduction cooled gantry lattice and analyze the cryocooler operating cost, cryocooler capital cost and conductor capital cost for Nb-Ti, Nb 3 Sn, REBCO and Bi-2223 over a continuous range of magnet temperatures, and a differential evolution algorithm is used to identify the optimal combination of thermal intercept temperatures. Although Nb 3 Sn yields the lowest Net Present Value (NPV) of $111.7k at a magnet temperature of 9.4 K, the optimized Bi-2223 design at 12.8 K approaches the realm of commercial feasibility by offering improved thermal stability and forgoing the need for costly conductor heat treatment and magnet quench training. Furthermore, it was found that Nb 3 Sn was more cost effective than Nb-Ti and that REBCO was not economically viable for the parameters of this investigation. The thermoeconomic model developed herein can optimize conductor choices, magnet temperatures and thermal staging which has value for any conduction-cooled superconducting magnet.

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Thermal performance analysis and measurements of the prototype cryomodules of European XFEL accelerator—Part II

Cited by 12 publications

References 3 publications

Does one need a 4.5 K screen in cryostats of superconducting accelerator devices operating in superfluid helium? lessons from the LHL

Does one need a 4.5 K screen in cryostats of superconducting accelerator devices operating in superfluid helium? lessons from the LHL

The International Linear Collider Technical Design Report - Volume 3.II: Accelerator Baseline Design

Thermoeconomic cost optimization of superconducting magnets for proton therapy gantries

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