U.S. Particle Accelerator School

Superconducting RF Technology course

Sponsoring University:

University of California, Berkeley


Superconducting RF Technology


Hasan Padamsee, Cornell University

Purpose and Audience
Superconducting technology becomes more and more important in accelerator physics and technology. In this course, the student is made familiar with the fundamental physics and technology of superconducting microwave devices as they are employed in particle accelerators. This course is specially designed for graduate students and young scientists interested to enter this field.

A course in Electromagnetism.

The goal of this course is to give the students a thorough introduction into the physics and technology of superconducting rf-components. Upon completion of the course, the student is expected to have obtained a thorough basis in the related physics. He is also expected to understand the technology applied and limitations thereof.

Instructional Method
Lectures by instructor will total about 25 hrs. Daily morning sessions will encompass 3 hrs. per class day (15 hr.). In addition there will be computer lab sessions or additional lectures each afternoon with instructor totaling about 10 hrs. The problems solved by students will comprise team presentations on the last day. Lecture Plan:

1. Fundamentals of Cavities
2. Fundamental of RF Superconductivity
     Theoretical Expectations
3. State-of-the-art in Applications
4. State-of-the-art in Cavity Performance
5. Real Surface Resistance Limits
6. Real Field Limits
     Multipacting, Thermal Breakdown, Field Emission
     Voltage breakdown (movies), Q-slope
7. Fabrication, issues and technology (movies)
8. Preparation of Cavities
9. Testing
10. Materials other than solid niobium
11. Accessories
   -Input couplers
   -HOM couplers, HOM loads
   -RF windows
12 CESR SRF System
   -Assembly (movie)
13 Future applications

Final Day: Homework Presentations

Course Content
The course will introduce the basic concepts of microwave cavities for accelerators and the fundamentals of RF superconductivity. In the second part we cover observed behavior such as residual resistance, thermal breakdown and field emission - together with the underlying causes. An important segment of the course covers technological aspects such as cavity fabrication, tuning, surface treatment, clean-room environments, niobium purification and thermometry diagnostics. Throughout the course, students will use this information to understand principles for optimum cavity design for a specific accelerator application. Finally we will cover related components such as input couplers and higher order mode dampers. Examples will be drawn from operating accelerators as well as future facilities planned for the high-current and high-energy frontiers.

Reading Requirements
“RF Superconductivity for Accelerators” by Hasan Padamsee, Wiley Publishers & assigned papers.

Credit Requirements
Students will be evaluated based on performance: 50% final presentation, 50% problem solutions handed in.