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Upgrading 600L/s IPPS
Gustavo AlverioUniversity of Central FloridaAugust 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 222-0800 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 222-0800
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
Before After
Back Panel
Before
After
Back Panel cont’d
Before After
Testing Calibration of torr meter 10/20 min run tests 8 hour simulation test
Testing cont’d Load resistance testing
I
IPPS air
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