Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC Engineering Challenges and Solutions for MeRHIC

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC Key Components Photoinjector Design – Electron Gun (A. Burrill, 11/2009) “Gatling Gun” multi-cathode Photocathodes & Drive Laser (A. Burrill, 11/2009) Laser development for the required intensity Linac SCRF Accelerator Cavities (A. Burrill, 11/2009) HOM Damper Upgrade, 6 Cavity Types, Cost and Schedule Cryogenic System (A. Burrill, 11/2009) RF systems (A. Burrill, 11/2009) SCRF Development and Design at BNL – Engineering Design Magnet Design Vacuum System RHIC Modifications – Civil and Beam Line Schedule

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC (April 09) Linac 1 Linac 2 Main ERLs; 6 cryomodules x 6 cavities x 18 Mev/cav = 0.65 GeV per linac 0.75, 2.05, 3.35 GeV 4 GeV 0.1, 1.4, 2.7 GeV Pre-accelerator 90 MeV ERL Electron gun 0.1 GeV IR2 region features: - asymmetric detector hall (appropriate for asymmetric detector for e-p collisions) - long wide (7.3m) tunnel on one side from the IR for energy recovery linac Main components: -100 MeV injector on the basis of polarized electron gun (50 mA) and pre-accelerator ERL. -Two main ERLs (one of them in the RHIC tunnel) with maximum 0.65 GeV energy gain per linac. -Recirculation passes are going outside of the existing tunnel: warm magnets, acceptable synchrotron radiation power. MeRHIC: General layout

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC 4 SCRF Cavity Development (Ilan’s Talk) Energy Recovery LINAC 5 Cell SCRF Assembled and Tested at 2K ERL e Gun ASME Code compliance design complete Laboratory Safety Committee Approval Fabrication underway RHIC 56 Mhz SCRF Cavity ASME Code compliance design complete Laboratory Safety Committee Approval Contract SCRF Vertical Test Facility ASME Code compliance design complete Laboratory Safety Committee Approval Test Dewar & Cryogenic Refrigerator in House Shielded Enclosure Complete Collaborative Support: JLab, AES, SNS, TRUMPF, Cornell, Amuneal,...

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC 5 SCRF Cavity Development – ASME Code Compliance Cryogenic Systems need extensive review (DOE Pressure Safety Compliance and LHC Failure) Detailed Stress Analysis done in house using ANSYS w/peer review Detailed Cryogenic Analysis to determine proper relief valve sizing w/peer review Fabrication QA: material testing and certifications, welding procedures and qualification, fabrication in process inspection, leak and pressure testing, certified relief devices, etc. Final Review and approval by Laboratory Committee

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC 6 Magnet Systems Arc Magnets (Conventional, Small Aperture, high accuracy, copper bus magnets) 361 Quadrupoles, 150 Dipoles, 56 Trim Dipoles, 56 Correctors Prototype dipole already machined, assembled, and field mapped. Quadrupole prototype being machined Spreader Combiner Magnets (Dan’s Talk) 4 Spreader/Combiner conventional dipole magnets, 10 thin septum magnets, 42 vertical dipole magnets, 68 Correctors SCRF Cavity Magnets 14 SC Quadrupoles in the SCRF cavity cryostats BNL Design, 1 st Article, Test, Commercial Bid – Built to Print or Build to Specification (SC Quadrupole).

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC Vacuum System Layout BEAM VACUUM 30 VACUUM SECTORS 10e -9 Torr pressure in arcs and s.s. 10e -10 Torr in baked transition regions <10e -10 Torr in SC LINAC Fully RF shielded components LINAC INSULATING VACUUM <10e -3 warm Turbomolecular pump on each Module MeRHIC Vacuum I&C Based on recent system upgrades to AGS/Booster and EBIS Challenges Stress in small aperture thin wall chambers. Synchrotron light energy absorber design. (JoAnne’s talk).

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC 8 Beam Line Modifications Required in the RHIC Tunnel Removal/Relocation of existing RHIC Beam Instrumentation. Removal of both DX magnets/Splice Bus. Install two new Polarized Proton Spin Rotators/modify VJP. Separate Beam Tubes for blue and yellow beam. Be beam tube. STAR and PHENIX beam tubes.

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC 9 Spin Rotator Installations 1:00 and 2:00 Fabricate 2 new Spin Rotators (BNL Magnet Division) Spare Coil Assembly will help schedule Reconfigure Q4 end for Spin Rotator Coupling New VJP sections required between Q3 and Spin Rotator New warm to cold fabricated for Spin Rotator/VJP transition Fabricate components to existing drawings 6:00 and 8:00

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC 10 Remove DX Magnets, Install e Beam Injection Chicane Removal of both DX magnets as a complete units Remove and re-splice Blue SC Bus. DO magnets do not have to be shifted 6 new warm dipoles for beam alignment 2 new wide aperture warm dipoles DX Magnet + Y chamber & ZDC

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC 11 Conventional Facilities – Civil Construction Major Additions: Racetrack tunnel with transitions to RHIC tunnel. (possible RHIC schedule issue) Service buildings with access ports to racetrack 1ea – 20x150 for cavities, 1ea – 16x40 for ERL, 2 ea -16x50 for bends Power Extension of the 13.8Kv overhead line to 2:00 – 25 MW 2ea – 2 ½ MVA unit substations, 1ea 13.8/4.2Kv transformers, Basic power distribution Cooling water 3 MW demineralized cooling water system - Basic water distribution Utilities Extension of the sanitary sewer line, Utility compressed air, Domestic water, Extension of the storm drains, Network / communications ductwork

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC Summary of C-AD Facility Characteristics Over 1 Million Ft 2 Of Equipment, Office, And Workshop Space 110 Buildings 1000 Acres Of Land 7 Accelerators 400 Direct Staff 22.5 Allocated Staff 6.2 Miles Of Vacuum Beam Pipe 24 Miles Of Cable Tray 62 Electrical Substations 1000s Of Electrical Distribution Circuits 15 Cooling Towers In Service 52 Cooling Systems In Service 1000s Of Electro-magnets / Power Supplies 1740 Superconducting Magnets in RHIC 26 Compressors For Cryogenics System Power Consumption: 25 MW includes 5 MW for the cryogenic refrigerator. (MeRHIC: 5.7 MW cryogenics, 14 MW RF and PS)

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC 13 Installation – Schedule Only Four year construction project CD-3 to CD-4 Critical Items must be ordered during CD-1 and CD-2 SCRF Cavity Fabrication Tunnel Construction Design Spin Rotator Magnet Fabrication Long Lead Items will drive schedule RHIC Operations Schedule During Construction New Tunnel tied in 2 years after CD-3 Temporary Shielding at Tunnel Tie-in Existing 20 Ton Crane! N E W S

Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC C-A Department 50 years of significant upgrades AGS (1960) 80” Bubble Chamber + others (1966) Slow Extracted Beam (1968) 200 MeV Linac (1970) AGS Polarized Protons/Heavy Ions ( ) Booster (1990) RHIC Facilities (1980 – 2000) NASA Space Radiation Laboratory (2004) Electron Beam Ion Source, Stochastic Cooling (2010) + Collaborations: SNS, LHC, NSLS,... MeRHIC is another evolution