MEDSI2023 - List of Authors (Duller, G.M.A.)

Paper	Title	Page
WEOAM02	A Vacuum Aspirated Cryo Cooling System (VACCS)	121
	G.M.A. Duller, D.L. Magrath, M. Nagy, B. Olafsson DLS, Oxfordshire, United Kingdom
	The use of liquid nitrogen for cooling of synchrotron equipment is widespread. The cryogenic sub-coolers commonly employed come with some significant drawbacks such as cost, complexity, stiffness of distribution lines, and vibration induced by pressure variations. The typical sub-cooler is capable of handling 2-3kW of absorbed power whilst many optics require no more than 50-150W of cooling. We present a Vacuum Aspirated Cryo-cooling System (VACCS) which overcomes many of these disadvantages and which allows cryo-cooling to be implemented more widely. The VACCS system uses a vacuum, generated with no moving parts, to draw LN2 through a heat exchanger. Thus the system does not have to be pressure rated. We describe our designs for highly flexible distribution lines. A simple control system offers variable temperature at the heat exchanger by varying the flowrate of LN2. A system is installed at Diamond which allows the independent control of three zones. A test rig has demonstrated cooling capacity in excess of 100W for a monochromator crystal assembly and controlled temperatures -194¿-120C.
	Slides WEOAM02 [21.578 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOAM02
About •	Received ※ 31 October 2023 — Revised ※ 27 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 08 January 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

A Vacuum Aspirated Cryo Cooling System (VACCS)

121

G.M.A. Duller, D.L. Magrath, M. Nagy, B. Olafsson
DLS, Oxfordshire, United Kingdom

The use of liquid nitrogen for cooling of synchrotron equipment is widespread. The cryogenic sub-coolers commonly employed come with some significant drawbacks such as cost, complexity, stiffness of distribution lines, and vibration induced by pressure variations. The typical sub-cooler is capable of handling 2-3kW of absorbed power whilst many optics require no more than 50-150W of cooling. We present a Vacuum Aspirated Cryo-cooling System (VACCS) which overcomes many of these disadvantages and which allows cryo-cooling to be implemented more widely. The VACCS system uses a vacuum, generated with no moving parts, to draw LN2 through a heat exchanger. Thus the system does not have to be pressure rated. We describe our designs for highly flexible distribution lines. A simple control system offers variable temperature at the heat exchanger by varying the flowrate of LN2. A system is installed at Diamond which allows the independent control of three zones. A test rig has demonstrated cooling capacity in excess of 100W for a monochromator crystal assembly and controlled temperatures -194¿-120C.

Slides WEOAM02 [21.578 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOAM02

About •

Received ※ 31 October 2023 — Revised ※ 27 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 08 January 2024

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)