PhD Micro cryo tips for cooling low-temperature electronic devices

PhD Micro cryo tips for cooling low-temperature electronic devices University of Twente Low-Temperature division Enschede, 7500 AE (Overijssel), 38 hours per week

Job description
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A PhD position is available at LT in a new project sponsored by the Dutch technology foundation STW. In this new project we want to develop multi-stage microcoolers that are able to reach even lower temperatures (~30K), and small sorption compressors [2] that can replace the pressurized gas bottles, and thus realize closed-cycle microcooling systems. The PhD should focus on the thermodynamics and design of multi-stage coolers, on the mechanism of clogging caused by water deposition, and measures to prevent this to occur [3], and on the development of a full package design
(including vacuum). In parallel, a post-doc researcher will be appointed in the project focusing on the utilization of results in two demonstrator pilots. In these pilots, LNAs will be cooled with a number of cooler tips fed by a single sorption compressor.

Requirements
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Required education/skills:University Graduate
The PhD should focus on the thermodynamics and design of multi-stage coolers, on the mechanism of clogging caused by water deposition, and measures to prevent this to occur [3], and on the development of a full package design (including vacuum)
Job type: Research / Advising

Workfield(s):
- Research trainees, non-tenured lecturers, researchers(Scientific
discipline: Engineering)

Organization
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University of Twente
Low-Temperature division
The Faculty of Science and Technology (700 faculty members, 1100 students) offers a range of bachelor and master courses (NanoTechnology, Applied Physics, Chemical Engineering and Technical Medicine). The faculty's research is organized in three of the university's interdisciplinary research institutes: MESA , BMTI, and IMPACT. These institutes increase the vitality of research by enabling collaboration between programs and disciplines, by providing shared facilities, and by attracting funding for joint projects. They also provide a conduit to industrial partners and help in attracting new faculty.

In the Low-Temperature division (LT) of the University of Twente (UT) cryogenic cooling based on MEMS technology has been investigated for about a decade. In this research, we aim to realize extremely small coolers by means of micromachining technologies (MEMS) for reaching cryogenic temperatures, well below 120 K, i.e. 150 oC. There is a growing need for these microcoolers for cooling advanced electronics, such as low-noise amplifiers (LNAs), detectors, superconducting circuits, etc. In a previous project [1], we developed a miniature 100 K cooler in which gas is expanded that is supplied by a high-pressure gas bottle (see figure).

Conditions of employment
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Estimated maximum salary per month: eur 2000 - 2500

Maximum salary amount in Euro's a month 2502
Employment basis: Temporary for specified period
Duration of the contract: 4 year
Maximum hours per week: 38

Additional conditions of employment:
We offer an interesting temporary research position . You will be appointed for a period of four year, with an assessment within one year. A positive assessment will secure the continuation of the appointment for another three years. The salary starts at €1.956,- gross per month increasing to € 2502.- gross per month in the fourth year. PhD students are expected to complete their research with a thesis. Benefits and other conditions of employment are in accordance with the Collective
Labour Agreement for Dutch Universities.

Additional Information
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Additional information about the vacancy can be obtained from:

Prof.dr.ir. H.J.M. ter Brake
Telephone number: 31 53 4894349
E-mail address: h.j.m.terbrake@utwente.nl
Or additional information can be obtained through one of the following
links:

- About the organization (
http://www.tnw.utwente.nl/en/)

Application
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You can apply for this job before 15-11-2007 (dd-mm-yyyy) by sending your
application to:

University of Twente
faculty TNW
Prof.dr.i.H.J.M. ter Brake
Postbus 217
7500 AE Enschede

E-mail: h.j.m.terbrake@tnw.utwente.nl

When applying for this job always mention the vacancynumber AT 07/173.

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