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Booster Solid-state driver rf upgrade. Tom Kubicki. The Basics. Booster HLRF System to be upgraded using 1kW Solid State Driver (SSD) Amplifiers. Used to drive the 200kW Power Amplifier Eliminates the tube amplifier components Significant improvement in reliability

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the basics
The Basics
  • Booster HLRF System to be upgraded using 1kW Solid State Driver (SSD) Amplifiers.
    • Used to drive the 200kW Power Amplifier
    • Eliminates the tube amplifier components
    • Significant improvement in reliability
  • Each station uses 4 1kW SSD Amps, along with a combiner, provides up to 4kW of RF power
  • Components are modular, allows for quick repair and minimizes downtime
solid state amplifier
Solid State Amplifier
  • Design based on Cubic Corp. 1kW amplifier used in the Main Injector RF Upgrade
  • Uses water-cooled heat sinks on the high power components
  • Design uses a pre-amplifier stage, 2 amplifier boards that each have 2 channels capable of 250W per channel, and an output combiner that sums all 4 outputs into one 1kW output (50 Ω system).
solid state amplifier1
Solid State Amplifier
  • Why build them here?
  • Cost of each amplifier built by Cubic would be ~$12K per amp.
  • All parts have been ordered, at a cost of ~$1.5K per amp.
  • Substantial cost savings!
    • Does not include labor, but that is “free”
  • 84 Amplifiers to be built.
solid state amplifier2
Solid State Amplifier
  • Failure rate is essentially 0
  • No problem running 15Hz
  • Possibility to employ feedback for gain and phase regulation (local and global)
    • Far off into the future on this one, but impossible with current RF system
  • Plenty of additional drive power for additional beam requirements, and/or to provide beam loading compensation if necessary
  • This has been ongoing since 2006, but really ramped up in late 2009.
  • As stated previously, all major parts have been ordered for the SSD amps.
    • Main amplifier board is stuffed, ferrites ordered, etc.
  • SSD control units: 20 have been built and tested. This is complete!
  • SSD Metering chassis: 10 units have been built and tested. 10 remaining, but have all the parts
    • Low priority on the remaining 10
    • All diode detectors built, 10 need to be calibrated
  • To date, NIM modules used in the SSD rack and Modulator have been built and tested.
    • 20 of each module built, includes spares and possible test station in the future
    • A few loose ends remaining, but have plenty of modules to complete East Gallery and most of West Gallery.
  • Booster SSD uses a Low-Level RF chassis, consisting of a phase shifter, variable gain amplifier (VGA), and output amplifier for increased gain.
    • The LLRF chassis drives the 1kW SSD amps.
    • LLRF chassis provides phase adjustment, a linear RF output in proportion to the Solid State Drive Program
    • 16 of these have been built and tested.
    • Parts have been ordered to build VGA’s, and the remaining LLRF chassis.
  • Stations 5 & 6 in the East gallery have been upgraded to solid-state.
future plans
Future Plans
  • In near term, get cables pulled for upgrade to stations 1 & 2.
    • Cables can be phased-matched during normal operations.
    • Possible retrofit of Station 19, would get us 4 additional amps for either Station 1 or 2.
  • Order the rest of the cable needed, Heliax, RG-58, etc.
    • List of cables required for tunnel and rack, RF engineers have been doing this
future plans1
Future Plans
  • Order NIM Power Supplies
    • Acquired 10 from surplus previously
    • Need 30 more
    • At a cost of $2.5K per supply, NIM supplies alone will cost an additional $75K!
    • One area with a large expenditure required!
  • Order 15 SSD Racks ($1.2K a rack, $18K)
  • Order any additional parts for SSD Rack (plumbing, connectors, etc.)
future plans2
Future Plans
    • Requires special jig for brazing heat sinks.
      • This item should be received shortly
    • May want to consider outside vendor to assemble the plumbing.
      • May be costly, but personnel is in short supply currently.
      • Would allow for more assembly line fabrication
      • May be necessary to meet future FY goals
    • Pre-fabrication of as many wires, cables, circuit boards, etc. as can be done
future plans3
Future Plans
  • In near term, one Screen Current Power Supply and Grid Bias Power Supply are being built for the Modulator.
    • Some parts remain to be ordered, but nothing show-stopping at the moment
  • 20 of each supply will be built
labor requirements
Labor Requirements
  • Labor estimate for SSD Amplifier Fabrication
    • Assumes heat sinks and as much pre-fabrication as possible (pre-assembly work)
  • Need at least 2 days for assembling first couple of amplifier modules (~ first 10), will progress faster once experienced.
  • Assuming 1.5 days on average, all 84 modules will require 126 days to be fabricated.
    • Very optimistic, will take longer depending on time to put heat sinks together.
  • Testing will (hopefully) be done in parallel with assembly.
    • T. Kubicki or J. Holm doing the testing?
labor requirements1
Labor Requirements
  • Testing of SSD Amps will take 1-2 days each.
    • Some are easier to calibrate than others.
  • Need RF tech(s) to build SSD relay racks.
    • 5 have been built, just waiting for SSD amps.
  • Time consuming, depending on pre-assembly, can take up to 3 weeks to build one rack.
  • Verification of final assembly
    • At least one day to check out fully assembled rack at MI-60 test station
labor requirements2
Labor Requirements
  • Building Grid Bias and Screen Current Power Supplies
    • A lot of cables, wires need to be fabricated.
    • Assembly of components can begin.
  • Estimating ~3 weeks to fabricate either one Grid Bias or Screen Supply.
  • Very time consuming
  • Upgrading a Booster RF station
    • Takes about 2 days with prep work (i.e. cables cut, terminated, and phased matched)
  • End of August
    • Have at least 1 SSD amplifier built and tested
      • Work out any “kinks” that may occur
    • At least One Grid Bias Supply and Screen Current Power Supply built and tested
    • Finish with the remaining NIM modules left to be tested
  • September-December ‘11
    • Have station 1 and 2 upgraded
    • Continue on building Amps, Power Supplies, Modulators, etc. Would like to see 20 SSD amps by Dec.
    • Assembly of SSD racks, cabling (rack and tunnel)
  • January-March ‘12
    • Continue building racks, finish up with any remaining cables that need to be fabricated for the SSD rack.
      • Digital I/O cable
    • Have 40 amplifiers built and tested
    • Have at least 10 Grid Bias and Screen Current Power Supplies built and tested
  • April-June ‘12
    • All racks should be built by now
    • Have at least 60 SSD amplifiers built and tested
    • Have at least 15 Grid Bias and Screen Current Power Supplies built and tested
    • East Gallery converted to Solid State by now, progression in the West Gallery
  • July-September ’12
    • Finish up with the remaining Solid State amplifiers
    • Finish up with the remaining Grid Bias and Screen Current Power Supplies
    • Finishing up converting the West Gallery to Solid State
  • Needless to say, the RF group has a lot to do!
  • To meet FY 12 goals, we need additional personnel to assist.
    • Operations and other ongoing projects (NML, HTS, A0PI, etc.) still require our attention.
  • Additional Funding for FY 11 (we could use a chunk of the $1.4M) to help achieve FY 12 goal of an all Solid-State Booster RF System
  • Proven designs work well and are reliable, but much assembly work is left to do!
  • Questions/Comments