scholarly journals Device cooling features in wiggler synchrotron workstations

2021 ◽  
Vol 2119 (1) ◽  
pp. 012129
Author(s):  
O A Kabov ◽  
Ya V Zubavichus ◽  
K E Cooper ◽  
M V Pukhovoy ◽  
V V Vinokurov ◽  
...  
Keyword(s):  
Thermal Management ◽  
Thermal Load ◽  
Radiation Power ◽  
High Energy ◽  
Optical Devices ◽  
High Energy Density ◽  
Optical Elements ◽  
Cooling Systems ◽  
Diamond Plate ◽  
Photon Source

Abstract Construction of the 4+ generation Siberian circular photon source (SKIF synchrotron) has started in Novosibirsk. It will initially be equipped with six research workstations. For two stations, synchrotron radiation is generated by superconducting wigglers, whose radiation power approaches 49 kW, and the power density on the axis is 92 kW/mrad2. Most of the optical devices of the stations operate in a vacuum. The high energy density of the synchrotron beamline and the requirements for the values of thermal deformations lead to difficult conditions for the thermal management of optical elements. The article provides an overview of the applied and promising cooling systems; an example of a 3D calculation of a thermal diamond filter of workstation 1-5 is given, the limit for the thermal load of the filter, at which the temperature of the diamond plate will not exceed 600 °C, is estimated.

scholarly journals Features of device cooling in wiggler synchrotron workstations

2021 ◽  
Vol 2057 (1) ◽  
pp. 012028
Author(s):  
O A Kabov ◽  
Ya V Zubavichus ◽  
K E Cooper ◽  
M V Pukhovoy ◽  
V V Vinokurov ◽  
...  
Keyword(s):  
Radiation Power ◽  
High Vacuum ◽  
High Energy ◽  
High Energy Density ◽  
Ansys Fluent ◽  
Optical Elements ◽  
Cooling Systems ◽  
Fluent Software ◽  
Stress And Strain Distribution ◽  
Ring Source

Abstract The construction of the «Siberian Photon Ring Source», the SKIF synchrotron, in Novosibirsk is underway. At the first stage, six research workstations will be created, most of the devices of which work in a high vacuum. Synchrotron radiation is generated by superconducting Wigglers for two stations. The total radiation power is approaching 49 kW, and the power density on the axis is 92 kW/mrad2. The high energy density of the beam creates quite difficult conditions for the thermal management of optical elements at the workstations. The article presents specific requirements for cooling devices, an overview of the used and promising cooling systems is made, an example of calculating the temperature, stress and strain distribution in a diamond filter with a thickness of 300 microns using the ANSYS Fluent software package is given.

Modeling and Analysis of a Thermal Management System With Thermoelectric Cooling for the Application in Li-Ion Batteries

2020 ◽  
Author(s):  
Amirhossein Mostafavi ◽  
Ankur Jain
Keyword(s):  
Thermal Management ◽  
High Energy ◽  
Cold Climate ◽  
Test Cell ◽  
High Energy Density ◽  
Li Ion Batteries ◽  
Thermoelectric Cooling ◽  
Temperature Range ◽  
Surface Temperatures ◽  
Li Ion

Abstract Lithium-ion (Li-ion) batteries have recently become the main source of power in portable devices due to advantages such as high energy density. However, Li-ion cells operate well only in a specific temperature range. Degraded preperformance is a consequence of low temperature operation, and potential fire risk originates from thermal runaway at elevated temperatures. Efficient thermal management of Li-ion cells and battery packs is essential to ensure safe and durable performance in wide temperature range. Thermoelectric coolers (TECs), which have been used widely for electronics cooling may also be appropriate for battery cooling due to size compactness, working with direct current. This paper presents experimental characterization of cooling of a prismatic test cell with TECs on two sides. Cooling effect of TEC on the cell core and surface temperatures is investigated at different TEC power rates. Results show core and surface temperatures of the test cell decrease significantly. The obtained results show that by applying the TEC, a temperature drop of 10 °C was achieved for 0.75A TEC current. The optimum TEC current can be selected based on the application. In addition, numerical simulations are carried out to compare with experimental measurements. Heating effect of mounted TECs can be easily achieved just by changing current direction. Experimental results reveal TECs can heat up a cell in cold climate shortly. In addition, thermo electric module may also offer insulating effect in cold climate. Results presented in this paper illustrate potential application of thermoelectric cooling for thermal management of Li-ion cells.

A simple optical system delivering a tunable micrometer pink beam that can compensate for heat-induced deformations

2015 ◽  
Vol 22 (4) ◽  
pp. 930-935 ◽  
Author(s):  
Ruben Reininger ◽  
Zunping Liu ◽  
Gilles Doumy ◽  
Linda Young
Keyword(s):  
Optical System ◽  
Heat Load ◽  
Optical Element ◽  
High Energy ◽  
Angle Of Incidence ◽  
Optical Elements ◽  
Source Distance ◽  
Energy Cutoff ◽  
Working Distance ◽  
Photon Source

The radiation from an undulator reflected from one or more optical elements (usually termed `pink-beam') is used in photon-hungry experiments. The optical elements serve as a high-energy cutoff and for focusing purposes. One of the issues with this configuration is maintaining the focal spot dimension as the energy of the undulator is varied, since this changes the heat load absorbed by the first optical element. Finite-element analyses of the power absorbed by a side water-cooled mirror exposed to the radiation emitted by an undulator at the Advanced Photon Source (APS) and at the APS after the proposed upgrade (APSU) reveals that the mirror deformation is very close to a convex cylinder creating a virtual source closer to the mirror than the undulator source. Here a simple optical system is described based on a Kirkpatrick–Baez pair which keeps the focus size to less than 2 µm (in the APSU case) with a working distance of 350 mm despite the heat-load-induced change in source distance. Detailed ray tracings at several photon energies for both the APS and APSU show that slightly decreasing the angle of incidence on the mirrors corrects the change in the `virtual' position of the source. The system delivers more than 70% of the first undulator harmonic with very low higher-orders contamination for energies between 5 and 10 keV.

Probing heat generation and release in 57.5 Ah high-energy-density Li-ion pouch cell with nickel-rich cathode and SiOx/graphite anode

2021 ◽  
Author(s):  
Xiaopeng Qi ◽  
Bingxue Liu ◽  
Fengling Yun ◽  
Changhong Wang ◽  
Rennian Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Thermal Management ◽  
Heat Generation ◽  
High Energy ◽  
Graphite Anode ◽  
High Energy Density ◽  
Large Format ◽  
Li Ion ◽  
Generation Mechanisms

The electrochemical performance, reliability, and safety of Li-ion cells depend on thermal management. However, the heat generation mechanisms and release characteristics of large-format high-energy-density (HED) Li-ion cells, a prerequisite for...

scholarly journals A ray-tracing algorithm for ab initio calculation of thermal load in undulator-based synchrotron beamlines

2020 ◽  
Vol 27 (5) ◽  
pp. 1108-1120
Author(s):  
Luca Rebuffi ◽  
Xianbo Shi ◽  
Manuel Sanchez del Rio ◽  
Ruben Reininger
Keyword(s):  
Ray Tracing ◽  
Thermal Load ◽  
Total Power ◽  
Optical Elements ◽  
Radiation Distribution ◽  
Power Load ◽  
Tracing Algorithm ◽  
Ray Trace ◽  
Comparison Of The Results ◽  
Photon Source

The OASYS suite and its powerful integration features are used to implement a ray-tracing algorithm to accurately calculate the thermal load in any component of an undulator-based synchrotron beamline. This is achieved by sampling and converting the SRW source of a given energy into a Shadow source and using the latter code to ray trace the full beamline. The accuracy of the algorithm is proved by reconstructing the full undulator radiation distribution through an aperture and comparing the result with direct calculaton of the total power using SRW. The algorithm is particularly suited to analyze cases with complex beamline layouts and optical elements, such as crystals, multilayers, and compound refractive lenses. Examples of its use to calculate the power load on elements of two of the feature beamlines at the Advanced Photon Source Upgrade Project and a comparison of the results with analytical calculations are presented.

Expendable High Energy Density Thermal Management Material: Ammonium Carbamate

2012 ◽  
Vol 26 (2) ◽  
pp. 345-351 ◽  
Author(s):  
Joel E. Schmidt ◽  
Douglas S. Dudis ◽  
Douglas J. Miller
Keyword(s):  
Energy Density ◽  
Thermal Management ◽  
High Energy ◽  
High Energy Density ◽  
Ammonium Carbamate
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