Analysis and Decision-Making for MEBT Kicker Technology in PIP-II Project
The final design and procurement readiness review for the PIP-II MEBT kickers involved evaluating alternatives, costs, and schedules, with a focus on 200-Ohm kicker technology. Developments in kicker design, testing, and decision-making points, such as choosing the 200-Ohm system over the 50-Ohm concept, were highlighted for efficient injection into the Booster. Various partnerships and technical considerations were crucial in guiding the project direction.
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MEBT kicker FDR/PRR Alternatives Analysis, Cost & Schedule Lionel PROST Final Design/Procurement Readiness Review for the PIP-II MEBT kickers 2 August 2018 In partnership with: India/DAE Italy/INFN UK/STFC France/CEA/Irfu, CNRS/IN2P3
Outline Alternatives Analysis 200-Ohm kicker as the baseline for the PIP-II chopping system Cost Schedule 2 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
Reminder In 2010 RFQ frequency dropped from 325 MHz to 162.5 MHz Concept with multiple (2) kickers 3 envelopes of the transmitted (a) and chopped- out (b) bunches simulated with TraceWin. Appears doable but still challenging (assumes CW operation) Two proposals: 50-Ohm and 200-Ohm structures 3 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
Kickers development Two versions developed in parallel 1 of each prototype installed at PIP2IT 50-Ohm 24 electrodes per plate connected in vacuum by 50 Ohm cables Driver: commercially available linear amplifier Concept tested with similar lower-power amplifier 200-Ohm Helix as a travelling-wave structure Driver developed at Fermilab Broadband, DC-coupled switches in push-pull configuration A. Chen G. Saewert D. Sun A. Chen 4 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
Decision point (~September 2017) Before the CD-1 review, it was decided that the Project should not continue to carry the cost of having 2 kicker designs in development Needed to set a baseline plan 200-Ohm kicker technology of choice At that time 200-Ohm system tests had demonstrated that it could provide the appropriate kicking pattern for bucket-to-bucket injection into the Booster The same proof-of-principle would have required the purchase of expensive power amplifiers not compatible with the project s budget profile 5 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
50-Ohm concept concerns not addressed Did not identify a linear power amplifier with proper characteristics readily available off-the-shelf Pre-distortion of the driving signal to correct for non-linearities only at the proof-of-principle level with low-power amplifier, matched dummy load and short sequence of bunches Unlike the 200-Ohm system case, the scheme with 50-Ohm kickers requires deflecting both the passing and to- be-removed bunches variations of the pulse voltage amplitude cause additional motion of the passing bunches stability issues Simulation made in MathCAD by V. Lebedev 6 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
50-Ohm concept concerns not addressed (cont) Pre-distortion implies that the LLRF system needs to generate a driving signal of exact shape and amplitude 200-Ohm design uses switches that only need binary signals 7 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
1.1% duty factor vs. CW Originally, the 50-Ohm system offered a clearer path to CW operation 50-Ohm kicker development ahead of 200-Ohm s Elimination of the CW requirement dramatically reduces difficulties for the design of the 200-Ohm kicker driver Requirements for 50-Ohm s PAs kicker likely unchanged 0.55 ms @ 20 Hz CW-compatible 8 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
Bottom line 200-Ohm kicker as the baseline technology for the MEBT chopping system Relatively low up-front cost Most expensive single part is the vacuum vessel (~$20k) Cost of PAs for 50-Ohm system: $500k-$1M (estimate) Flexibility: design and fabrication at FNAL 50-Ohm kicker design as back-up Appears in the Risk Registry 9 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
Cost (for 2 production kickers) M&S Mechanical structure Feedthroughs (for 2): $40k (already in procurement) Tooling: $5k Cost for 1 unit, k$ Parts Machinable Nitride Ceramics (Photoveel II) Electro- and laser welding Ground tube & brazing Ceramic stands Vacuum box Other misc. 7 5 5 4 8 6 35 Total for 2 kickers: $115,000 Total 10 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
Cost (for 2 production kickers) M&S Item Qty Cost, $ Totals, $ Driver electronics ~$50k for two kicker drivers Photonic components Laser SOA Amplifier/switch Fiber optic, cable, connectors 2 2 1,300 3,900 2,500 Misc. PCBs, parts, chassis 1,000 Photonics subtotal 8,700 FET Drivers & Loads Ceramic substrates FETs, misc. parts, PCBs Loads 10 1,800 1,200 2,200 8 Drivers subtotal 5,200 Misc. cable & Hardware 1-1/4 Heliax Connectors, adapters 280 2,400 1,000 Misc. subtotal 3,400 Equipment Scope, 4-Chan., 1 GHz 600V dc, 2.6 A PS Computer Relay rack Misc. PSs, instrumentation 20,000 3,600 1,000 2,000 1,200 2 1 Equip. subtotal Machine shop 27,800 5,000 50,100 TOTAL 11 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
Cost (for 2 production kickers) FTE Mechanical structure 25% FTE Principal Engineer for 8 months 30% FTE Designer for 2 months 5% FTE Designer for 5 months 50% FTE Mechanical Tech. for 3 months 75% FTE Senior Electronics Engineer for 1 month Driver electronics 60% FTE Senior Electronics Engineer for 11 months 55% FTE Electronics Technician for 10 months 5% FTE Software Developer for 2 months 12 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
Schedule Driven by fabrication of driver electronics ~1 year once the approval to proceed is received Mechanical structure 8-9 months once the approval to proceed is received Drawings already complete (~1 month worth) Ready for offline tests and tuning: July/August 2019 Ready for installation on the beam line at PIP2IT ~2 weeks later 13 8/2/2018 L. Prost | MEBT kicker FDR/PRR | Alt. Analysis, Cost & Schedule
