Between Dec 19, 2024 and Jan 2, 2025, datasets can be submitted to DRUM but will not be processed until after the break. Staff will not be available to answer email during this period, and will not be able to provide DOIs until after Jan 2. If you are in need of a DOI during this period, consider Dryad or OpenICPSR. Submission responses to the UDC may also be delayed during this time.
 

Fiber Optic Feedthrough Design For Use In Cryogenic Dilution Refrigeration Systems

2012-04-18
Loading...
Thumbnail Image

View/Download File

Persistent link to this item

Statistics
View Statistics

Journal Title

Journal ISSN

Volume Title

Title

Fiber Optic Feedthrough Design For Use In Cryogenic Dilution Refrigeration Systems

Published Date

2012-04-18

Publisher

Type

Presentation

Abstract

Bose-Einstein condensation is a fundamental state of dilute gases of bosons. It was originally predicted in 1924 by S. Bose and A. Einstein, and it refers to a quantum configuration at low temperatures in which a large portion (the condensate fraction) of particles collapse into the ground state. As can be seen in Figure 1, Rb-87 has been shown to exhibit the properties of Bose-Einstein condensation at low temperatures. Our experiment focuses on studying superfluid Helium-4. A superfluid is a phase of matter with zero viscosity, infinite conductivity, and other unusual properties. It is generally accepted that the superfluid properties of supercooled Helium-4 is caused by the composite boson exhibiting behavior associated with Bose-Einstein condensation, but it has not yet been conclusively proven. The goal of our experiment is to analyze the transmission characteristics of a slab of Helium-4 superfluid. These transmission characteristics could hopefully be used to offer some evidence of Bose-Einstein condensation in superfluid Helium-4. To accomplish this task, we used a dilution refrigeration system to cool our experimental cell down to extremely low temperatures. Inside the cell, we use a laser pulse in a fiber optic cable to produce a pulse of atoms at the bottom of the slab of Helium-4. These atoms are then transmitted through the slab and shot out the other side. The transmitted atoms are then detected on a series of superconducting bolometers. With bolometers, we are able to accurately and quickly determine energy levels of the transmitted atoms when they strike the surface of each bolometer. The purpose of my research focused on the design of our internal vacuum can and cell. The aspect of the design that needed modifying was the optical fiber feed through, which can be seen in Figure 3. These feedthroughs are essential in transferring laser pulses from an external source into the experimental cell. The feedthroughs must be leak proof in order to allow the dilution refrigeration system to run smoothly as well as to maintain accuracy within the experimental cell.

Description

Faculty adviser: Dr. J. Woods Halley

Related to

Replaces

License

Series/Report Number

Funding information

This research was supported by the Undergraduate Research Opportunities Program (UROP).

Isbn identifier

Doi identifier

Previously Published Citation

Other identifiers

Suggested citation

Maunu, Tyler. (2012). Fiber Optic Feedthrough Design For Use In Cryogenic Dilution Refrigeration Systems. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/139973.

Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.