1. Evaporative Cooling for the Inner Detectors of ATLAS
Lauranne Lanz
August 10, 2006
University of Maryland, College Park
University of Michigan/CERN REU
Advisor: Dr. Steve McMahon
Supervisor: Dr. Leonardo Rossi

2. Why … is Cooling Necessary? Evaporative Cooling?
Detectors need to operate at ~ -7°C
SCT  41.3 kW
Pixel detector  18.7 kW
Evaporative Cooling?
Evaporative Cooling  removal of heat through the use of latent heat of evaporation
Advantages:
Minimal material
C3F8
High heat transfer for low mass
Radiation hard

3. Evaporative Cooling Process
Fluid:
Comes from condenser as room temperature liquid
Cools in and expands from capillaries
Enters detector structures and absorbs heat

4. Evaporative Cooling Process
Remaining fluid evaporated
Vapor brought to 12°C
Reaches compressor as superheated vapor
Enters condenser as pressurized vapor

5. Motivation Complex circuits ATLAS construction scheme
Pixel detector - 88 circuits
SCT barrel+endcaps circuits
ATLAS construction scheme
Need for user-friendly interface

6. My Project Develop a Java program capable of: Online deployment
Importing data from the current format
Creating table
Creating tables of data subsets
Obtain information on one circuit
Export the information to printable form

7. Process Learn Java and Eclipse Write programs to use test data to:
Import Excel information
Make tables
Obtain one set of information
Online deployment
Adapt to actual Excel file
Add Export feature
Comment Program

8. Results

9. Results
Construction: Inner detector components are not being built in the pit. Therefore,
there are cables at both ends that need to match.
Further, built detector != actual detector
Therefore, mapping of circuits undertaken but info is not readily accessible
Learning java to create java applets to allow web-based access of that information

10. Results

11. Results

12. Future directions
Deployment
Direct link to printer

13. Acknowledgements Mentor - Dr.Steve McMahon Vit Sopko U. Michigan
Dr. Neal
Dr. Krisch
Jeremy Herr
Dr. Goldfarb
CERN Summer Program
NSF and Ford

14. Questions?