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PHYS 427 A: Applications of Physics

Summer Term: 
Full-term
Meeting Time: 
MWF 8:30am - 9:30am
Location: 
* *
SLN: 
13216
Instructor:
Subramanian Ramachandran

Syllabus Description:

PHYS427 Course Description

Summer 2020

Applications of Physics (Low temperature physics)

Name of the Instructor: Subramanian Ramachandran, PhD

Number of credits: 3

In this course, we 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. Importance of high vacuum and radiation shields to mitigate parasitic heat transfer will be emphasized. Subject to availability of time, types of temperature measurement sensors and circuits used for low temperature applications, the phenomenon of superconductivity and application of cryogenic calorimetry to the study of various phase transitions will be included. Throughout the course the underlying physics will be discussed alongside the engineering considerations.

Pre-requisites:

Physics 224 (Thermal Physics) and 225 (Intro to Quantum) with a minimum grade of 2.0 in each are the required prerequisites for this course.  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, ISBN: 10-3-540-46356-9.

Contact Information:

Instructor: Subramanian Ramachandran, ramacs@uw.edu

TA: Haoran Zhao E-mail: hrzhao@uw.edu 

Detailed Course Syllabus:

PHYS 427 _Applphy_Sum2020_course_syllabus.pdf

Weekly Schedule:

Week

Date

Topic

Read

HW

1

6/22

Introduction, Properties of LH2

Pobell 2.2

 

 

6/24

LH2 and LHe (Quiz 1)

Pobell 2.3

HW 1 assigned

 

6/26

LHe

Writing credit topic selection

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

Pobell 3

 

7/8

Discussion of relevant thermal, electrical and magnetic properties.  (Quiz 3)

Pobell 3

HW 3 assigned

 

7/10

Thermal  Contact and Thermal Isolation;

Pobell  4.1 to 4.3 ,

 

4

7/13

(Quiz 4) Kapitza resistance

Notes, 4.3

HW2 due

 

 

7/15

Liquid He cryostat Chapter 5.1 and 5.2

 

 

7/17

Review; Exam online

 

 

 5

7/20

Radiation in cryostat

Notes, Pobell 5.2

HW 3 due,

7/22

Liquefiers (Quiz 5)

Notes, 5.3

HW 4 assigned

 

7/24

Closed cycle refrigerators (Quiz 6)

Notes,

 

6

7/27

Closed cycle refrigerators Notes

 

 

7/29

3He-4He dilution refrigerator; building blocks

Pobell 7.1,7.2

HW 4 due, HW 5 assigned

 

7/31

Dilution refrigerator contd...

(Quiz 7)

 

Pobell 7.1, 7.2

 

7

8/3

Dilution refrigerator contd...

Pobell 7.1, 7.2

 

8/5

Review, Exam online

 

 

8/7

Dilution refrigerator contd....

Pobell 7.3, 7.4

 

8

8/10

Refrigeration by adiabatic demagnetization of paramagnetic salt

Draft final paper

Pobell 9.1-9.4

HW 5 due, HW 6 assigned

 

8/12

Adiabatic nuclear demagnetization – heat load and heat leak (Quiz 9)

 

Pobell 10.4-10.5

 

 

8/14

Nuclear refrigerants, hyperfine enhanced nuclear refrigeration, nuclear demagnetization refrigerator

Pobell 10.6-10.8

HW 7 assigned

9

8/17

Low temperature thermometry (Quiz 10)

Pobell 12.1-12.3

HW 6 due,

 

8/19

Guest Lecture Dr. Ramos

 

 

 

8/21

Review, Exam online

Final paper due for Writing credit

 

HW 7 due

Catalog Description: 
Current applications of physics to problems in the sciences and technology.
GE Requirements: 
Natural World (NW)
Credits: 
3.0
Status: 
Active
Section Type: 
Lecture
Last updated: 
April 22, 2020 - 9:51pm
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