Course Syllabus
PHYS427 Course Description
Summer 2021
Applications of Physics
Name of the Instructor: Subramanian Ramachandran, PhD
Number of credits: 3
The course will “Discuss the physics and thermodynamics of mechanisms involved in the realization of cryogenic temperatures down to nK. The focus will be on closed cycle refrigerators including pulse tube and Gifford-McMahon refrigerators. Topics to be studied will include dilution refrigeration, and adiabatic demagnetization refrigeration.”
STUDENTS DESIRING TO EARN WRITING CREDITS WILL BE REQUIRED TO WORK ON A SCIENTIFIC PAPER ON A TOPIC THAT IS RELEVANT TO THE COURSE IN CONSULTATION WITH THE INSTRUCTOR.
This course meets the upper division elective requirements in physics.
Pre-requisites:
PHYS 224 and PHYS 225. Please contact the instructor if you have questions at: ramacs@uw.edu
Prescribed text:
Matter and Methods at Low Temperatures 3rd edition, Frank Pobell, Springer Publications.
Detailed Syllabus:
PHYS 427 _Applphy_Sum2021_course_syllabus.pdf
Weekly Schedule:
|
Week |
Date |
Topic |
Read |
HW |
|
1 |
6/22 |
Introduction, Properties of LH2 |
Pobell 2.2 |
HW 1 assigned |
|
|
6/24 |
LH2 and LHe (Quiz 1) |
Pobell 2.3 |
|
|
2 |
6/29 |
LHe (Quiz 2) |
Pobell 2.3 |
|
|
|
7/1 |
Discussion of relevant thermal, electrical, and magnetic properties |
Pobell 3 |
Hw 1 due, HW 2 assigned |
|
3 |
7/6 |
Discussion of relevant thermal, electrical and magnetic properties (Quiz 3) |
Pobell 3 |
|
|
|
7/8 |
Thermal Contact and Thermal Isolation; He4 cryostat, He4 cryostat |
Pobell 4.1 to 4.3 , 5.2 |
|
|
4 |
7/13 |
Closed Cycle refrigerators (Quiz 4) |
Notes, Pobell 5.3 |
HW2 due, HW 3 assigned |
|
|
7/15 |
Closed Cycle refrigerators Review; Exam online |
Notes |
|
|
5 |
7/20 |
Helium 3 cryostat (Quiz 5) |
Pobell 6.1 and 6.2 |
|
|
7/22 |
3He-4He dilution refrigerator; phase diagram (Quiz 6) |
Pobell 7.1-7.3 |
HW 3 due HW 4 assigned |
|
|
6 |
7/27 |
3He-4He dilution refrigerator; building blocks |
Pobell 7.3, 7.4 |
|
|
|
7/29 |
Pomeranchuck cooling (Quiz 7) |
Pobell 8.1-8.3 |
HW 4 due HW 5 assigned |
|
7 |
8/3 |
Refrigeration by adiabatic demagnetization of paramagnetic salt (Quiz 8) |
Pobell 9.1- 9.4 |
|
|
8/5 |
Adiabatic nuclear demagnetization Review, Exam online |
Pobell 10.1-10.3 |
HW 5 due, HW 6 assigned |
|
|
8 |
8/10 |
Adiabatic nuclear demagnetization – heat load and heat leak (Quiz 9)
|
Pobell 10.4-10.5 |
|
|
|
8/12 |
Nuclear refrigerants, hyperfine enhanced nuclear refrigeration, nuclear demagnetization refrigerator |
Pobell 10.6-10.8 |
HW 6 due, HW 7 assigned |
|
9 |
8/17 |
Low temperature thermometry (Quiz 10) |
Pobell 12.1-12.3 |
|
|
|
8/19 |
Review, Exam online |
|
HW 7 due |
Course Summary:
| Date | Details | Due |
|---|---|---|