Upgrading 600L/s IPPS Gustavo Alverio University of Central Florida August 5, 2003

Introduction Ion pump power supplies (IPPS) are located in booster gallery Supply power to 600 L/s ion pumps located in booster ring Old IPPS were inaccurate and poorly efficient Modified IPPS are more productive and accurate The modification of the IPPS will pave the way for greater vacuum, thus better quality beam

Ion Pumps About 80 pumps located around booster beam Absorb ions in vacuum tube Pump contains plates Supplied voltage charges plates Ions are attracted to charged plates, and stick onto the plates With less ions and a better vacuum, beam is of better quality

Ion Pumps cont’d Ultek 600L/s Ion pump Operation life is 40,000 hours at 10E-6 torr

IPPS IPPS are located around booster gallery One IPPS controls one ion pump Delivers voltage to the ion pump Inside IPPS are capacitors, resistors, diodes, transformers, wires, etc. Project focuses on modification of Perkin- Elmer IPPS

IPPS cont’d IPPS are placed in relay racks around booster gallery. The blue label indicates where in booster ring the ion pump is located.

Problem IPPS are over 30 years old Inaccurate read-backs Poor efficiency

Solution Investigate read-back inaccuracies Analyze different methods for increased efficiencies Updating out-dated components Developing the daughter card Filter noise

Daughter Card Contains resistors, capacitors, diodes, and gates Squared off section in schematic 3 main elements Top circuit – converts current to voltage Middle circuit – powers card Bottom circuit – controls IPPS

Daughter Card cont’d

Testing Cards Extender card for safety Adjust R30 to 6.1V Establish a reference level Verify components measure accurately Run timing tests

Modifying Obtain old power supplies There are 55 Perkin-Elmer IPPS Most components are removed as well as wires IPPS circuitry remains similar to old

Front panel Before After

Left Side Panel Before After

Right Side Panel BeforeAfter

Back Panel Before After

Back Panel cont’d BeforeAfter

Testing Calibration of torr meter 10/20 min run tests 8 hour simulation test

Testing cont’d Load resistance testing I IPPSair load Ion pump

Conclusions Upgrade IPPS will lead to better control of vacuum Setbacks Delay in schedule Troubleshooting Knowledge of electrical circuits Technical skills Soldering Drilling