PHY695 fall 2021
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This graduate level course covers fundamental aspects of cryogenics systems and engineering properties of materials and fluids at low temperatures, cryogenic heat transfer and fluid dynamics, and low temperature refrigeration systems. Special focus will be on the physics and engineering aspects of liquid helium, ultra-pure liquid argon, and sub-Kelvin systems and their application in the cooling of contemporary particle accelerators, detectors, and sensors.
The course is intended for graduate students pursuing accelerator physics as well as graduate engineers and physicists who want to familiarize themselves with cryogenics.
The course will begin with an introduction to cryogenics, including a brief history of the low temperature field and temperature measurement. The properties of materials at cryogenic temperatures and cryogenic fluids will then be discussed. Achieving cryogenic temperatures will be described, with particular emphasis on liquefaction and closed cycle refrigeration, followed by discussion of fluid and superfluid properties of helium. The discussion of refrigeration technologies will be extended below 1 Kelvin with the introduction of Helium-3 cryogenics and the dilution refrigerator, among other techniques. The concept of Argon purification to parts per trillion levels to enable very high purity neutrino experiments is also introduced. Finally, the related fields of cryogenic instrumentation and cryogenic safety will be presented.
Upon completion of this course, students are expected to understand the physics behavior of systems and materials operating at cryogenic temperatures, and the technologies used to achieve and maintain temperatures at and below that of liquid helium. The aim is to provide students with ideas and approaches that enable them to evaluate and solve problems related to the application of cryogenic technologies to particle accelerators and quantum technologies.
Textbook and suggested materials
It is recommended that students re-familiarize themselves with the fundamentals of thermodynamics.
While all necessary material will be provided during lectures, we recommend the following textbook for in-depth study of the subject:
- K. Timmerhaus and T. Flynn, Cryogenic Process Engineering, Plenum (1989).
Additional suggested reference books:
- F. Pobell, Matter and Methods at Low Temperatures, Third Edition, Springer (2007).
- S. W. Van Sciver, Helium Cryogenics, Second Edition, Springer (2012).
- J. W. Ekin, Experimental Techniques for Low Temperature Measurements, Oxford (2006).
This course includes a series of lectures and exercise sessions. Homework problems will be assigned. Homework will be graded, and answers provided in the exercise sessions. There will be a final exam at the conclusion of the course.
Students will be evaluated based on the following performance criteria: final exam (50%), homework assignments and class participation (50%).
- [Add Link Lecture 1: Introduction, course goals and introduction to cryogenic engineering]
- [Add Link Lecture 2: Thermodynamics for cryogenics]
- [Add Link Lecture 3: Properties of cryogenics fluids]
- [Add Link Lecture 4: Low temperature properties of materials]
- [Add Link Lecture 5: Liquid argon cryogenics]
- [Add Link Lecture 6: LCLS-II Cryogenics - invited]
- [Add Link Lecture 7: Cryogenic Fluid Mechanics]
- [Add Link Lecture 8: Cryogenic Heat Transfer]
- [Add Link Lecture 9: Superfluid helium properties]
- [Add Link Lecture 10: Cryogenic cycles - 1]
- [Add Link Lecture 11: Cryogenic cycles - 2]
- [Add Link Lecture 12: Liquefaction and Refrigeration]
- [Add Link Lecture 13: Cryogenic storage]
- [Add Link Lecture 14: Basics of cryogenic systems design]
- [Add Link Lecture 15: Cryogenic Instrumentation]
- [Add Link Lecture 16: Introduction to Sub-1 Kelvin cryogenics]
- [Add Link Lecture 17: Materials and other considerations at Sub-1 Kelvin temperatures]
- [Add Link Lecture 18: Pumped Helium-4 and Helium-3 refrigerators]
- [Add Link Lecture 19: Adiabatic demagnetization refrigerators]
- [Add Link Lecture 20: Dilution Refrigerators]
- [Add Link Lecture 21: Thermometry at Sub-1 Kelvin temperatures]
- [Add Link Lecture 22: Nuclear Demagnetization and Pomeranchuk Cooling]
- [Add Link Lecture 23: SRF - invited]
- [Add Link Lecture 24: SRF - invited]
- [Add Link Lecture 25: PIP-II Cryogenics - invited]
- [Add Link Lecture 26: Cryogenic equipment]
- [Add Link Lecture 27: Cryostat design - 1]
- [Add Link Lecture 28: LBNF/DUNE - invited]
- [Add Link Lecture 29: Cryostat design - 2]
- [Add Link Lecture 30: SRF cryomodule design - invited]
- [Add Link Lecture 31: Cryogenic safety]
- Add link HW1 Due September 9, 2021
Homework review sessions
- Session 1, September 9, 2021
- Session 2, September 23, 2021
- Session 3, October 14, 2021
- Session 4, October 21, 2021
- Session 5, November 18, 2021
Add link Final Exam due December 16