Introduction to RFQ Injector Upgrade W Pellico September 1 2011 1 An Old Idea RFQ Injector Fermi Lab hadhas considered RFQs Late 1980s BNL and Fermi Lab worked with LBL on a RFQ design 200 ID: 764343
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Introduction to RFQ Injector Upgrade W. PellicoSeptember 1 2011 1
An Old Idea – RFQ Injector Fermi Lab had/has considered RFQ’s Late 1980’s BNL and Fermi Lab worked with LBL on a RFQ design 200 Mhz RFQ built for BNL – Fermi canceled their optionBNL has successfully operated 201.25 MhzThere has been several other RFQ proposals (Not Engineered Plans) 2
FNAL RFQ Proposal After a review of all systems in Proton Source the Cockcroft – Walton was determined to be a liability (others were also identified.) Solution – Replace Cockcroft-Walton with RFQ (use existing technology) Project work started in 2009 (initial funding out of operating funds)Review of various RFQ designsSeveral vendors submitted RFQ proposalsOperating RFQ systems were reviewedHINSRutherfordBNLLANL Discussions were held with various RFQ experts BNL LNALLBLArgonne 3
4 FNAL RFQ Injector The Goals: To transport up to 50 ma to the end of DTL1 To reduce beam emittances from present system To build a system capable of operating > 20 years System should be designed with operational considerations Use BNL injector as the template – Risk Reduction BNL uses magnetron source. Same as FNAL. BNL DTL 1 is the same as FNAL. BNL has years of experience operating LEBT, RFQ, MEBT Reduce technical risk as much as possible by using BNL experience .
RFQ design Vendor Chosen – Dr. Schempp (FY10) The FNAL design is very conservative and based upon an existing RFQ injector system at BNL Similarities of BNL to FNAL injector Similar Beam CurrentsSimilar Power Similar DTL tankRFQ EnergySimilar Lattice (Buncher, Solenoids and Quads)Neutralization/Space Charge issuesMinor DifferencesFNAL only runs H- (BNL needs to run to types of Beam)FNAL length is shorterLower duty c ycle for FNAL 5
Injector Design/Components Discussion/Visit with BNL led to present design Extended discussions with Dr. Schempp on RFQ Size PowerMaximizing match – beam throughputLong Lead items were identified (Assisted by TD)MagnetsSolenoidsQuadsOperating specs were worked on with TD and BNL helpPO’s were placed end of FY10 for most major elements 6
Injector Design/Issues & Examples The FNAL RFQ design was modified several times during FY10 and FY11 (Optimizing Beam & Space) Two Sources Movable vs. Fixed Shorter Length (Movable)Additional Vacuum hardware (Movable)Chopper vs. Einzel LensSparking concernsNeutralization IssuesQuadrupole configurationLength of MEBTAbility/flexibility to adjust beam parameters Trims (separate or saddled in with quads – MEBT) Heating – cooling issues LEBT Vacuum break points (Operational Concerns) 7
Injector Design/Issues - Continued Operating Issues/Concerns Feasibility of switching sources Beam Intensity – range of possible beam current Vacuum pressuresHow much pumping/pressures were acceptableCompared with present systemReviewed similar systems (…BNL)Vacuum pumps/controls – opted for new vs. reuseLattice Matching (studies)Measurements of present beam opticsMeasurements of present beam emittances 8
Final Injector Design Components Two Round Dimple Magnetron Sources Current design max 90ma Emittances – better then present Horz 1.6π mm mr (normalized)Vert 2.95π mm mrTwo Solenoids (LEBT)Three Window Trim Packages (LEBT) Einzel Lens (~-35 KV) RFQ (201.25 @ ~130KW)Two Quad Doublet Packages (MEBT)Trims are saddled under quads Double Gap Buncher (201.25 @ ~5KW) 9
Solenoids Trims Sources Einzel Lens RFQ Quads Buncher Basic Layout of FNAL RFQ Injector Line 10
RFQ Injector Floorplan for I- Dome Area Chosen Layout Beam Direction 11
Project Plan Testing Plans Buncher Completed RFQ Driver Load Tested Low Power RFQ Test (September – October)Conditioning RFQ (October)Power Supply TestingSolenoids Testing Just StartingQuads (October)Sources Testing Various Configuration – Never EndingOptimizing Current/Emittances/Design Beam to LEBT ( November)Einzel TestingBeam to RFQ (November) Diagnostics Line being assembled Wire Chamber Completed Testing of RFQ – Through to Shutdown Milestones Goals Beam Flux Beam Emittances Uptime – issues understood – confident of >99 % UT Remaining (Hardware) Pieces to Puzzle Quads (Being Assembled) Field Testing This Month Magnets delivered in Oct. LEBT Trims (Being Built – Millhouse) Due in Oct. All Vacuum Parts Ordered Power Supplies For Quads and Trims Being Assembled Finished This Fall Pulsed Supply Racks being stuffed Testing within a month Vacuum Controls Rack Being Assembled/Filled LCW Nearly Complete May make new manifold May replace some hoses MEBT stand Will be completed by end of year Safety System System Approval Details Already Submitted/Discussed System Testing Some Items can be done prior to 2012 12
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AD People (RFQ Project Management) Sources Dan Bollinger Jim Lackey Pulsed Power SuppliesSteve Hays Power SuppliesKen KochDrew FeldPhysicsCY TanRFQBrian Schupbach (RFQ Driver Supply)Ding Sun (Buncher and RFQ Testing)EngineeringKevin Duel Planning (Operations, Shutdown, Commissioning) CY Tan (Project Management, Studies Scheduling)) Bill (Project Management, Funding, Manpower)Mary (Scheduling Shutdown Work for Proton Source) Fernanda (Scheduling of Linac Work w.r.t RFQ Injector Work) Elmie (Microsoft Office – Input Project Tasks) Power Supplies Steve Hays Utilities Brain Schupbach, Dave Hixson (LCW) Kent Triplett (Vacuum) Jeff Larson (Vacuum) 14