Extraction from the Delivery Ring November 19, 2013 J. Morgan

Conceptual Design Antiproton production Muon Campus (g-2 operation) Repurposing Pbar 2

Beamline Design – Dual modes 3.1 GeV/c Pion decay channel, beta functions need to be as small as possible to maximize muon capture 40 pi-mm-mr transverse acceptance, +/- 2% dp/p momentum acceptance Beam does a few turns in Delivery Ring to separate and eliminate protons Single turn extraction into M4 and M GeV/c proton beam bypasses Target Station and is transported in M3 Beam intensity is much higher that Pbar was or g-2 will be Protons are resonantly extracted from the Delivery Ring Extracted beam is transported down M4 to the Mu2e Target g-2 versus Mu2e operation g-2 operation Mu2e operation 3

Strategy for extraction plan - to provide maximum flexibility between experiments at least expense - Work around Mu2e extraction devices Both single turn (g-2) and resonant (Mu2e) extraction Resonant extraction more difficult to design for Electrostatic septa on either side of D2Q3 during Mu2e operation Lambertsons or Lambertson/bending magnet required on either side of D2Q5 Placement of extraction channel defined by resonantly extracted beam Try to reuse existing equipment Pbar kickers have best combination of strength and aperture at FNAL Kickers have the smallest physical apertures in the Delivery Ring Need 8Qx at D2Q5, our donated ANL 8Q32’s need significant work 8Q32 needs more rad. Hardened water lines, relocated power flags g-2 has acceptance goal of 40-pi-mm Large displacement in both planes through D2Q5 limits aperture Kickers must produce large separation (~48 mm) in Lambertson Kicker(s) must produce 7 mr kick to achieve 48 mm separation New devices should be based on existing designs Lambertson is similar to MLAW C-Magnet is shorter, larger aperture version of Main Injector ICA and has more turns Try not to overlap injection and extraction regions 4

Conceptual Design Extraction region 8Q32 40 pi-mm-mr beam envelopes Mu2e septa, relocated kicker Delivery Ring extraction Extraction layout is driven by requirements for Mu2e resonantly extracted beam Lambertson is required for Mu2e to work with electrostatic septa A larger aperture quadrupole is required at D2Q5, using ANL 8Q32 Mu2e resonantly extracted beam will be much smaller than g-2 muon beam g-2 and Mu2e will use a Delivery Ring lattice similar to the Pbar Debuncher lattice Different horizontal trajectories are needed for g-2 and Mu2e A large horizontal bump across the extraction region is used for g-2 g-2 needs an extraction kicker for beam to enter the M4 line Best location for kickers is where Mu2e septa will eventually reside A two kicker system will be used for g-2 operation Can’t get 40 pi-mm-mr acceptance with 3 kicker system Existing Pbar extraction kicker magnets can be reused Extraction scheme provides 40 pi-mm-mr acceptance for g-2 and a common extraction channel for both experiments Pbar/Muon extraction Kicker 5

g-2 operation and Mu2e commissioning Horizontal bend (5  ) Injection kickers Injection Pulsed Septum and C-magnet (septum) Extraction Lambertson and C-magnet (septum) Extraction kickers Vertical bends Vertical bend 6

Dual running mode configuration Horizontal bend (5  ) Injection kickers Extraction septa (Mu2e) Extraction kicker (g-2) Vertical bends Vertical bend Injection Pulsed Septum and C-magnet (septum) Extraction Lambertson and C-magnet (septum) 7

Conceptual Design 30 straight section – injection and extraction lines M3 M4 M5 8

Mu2e Extraction Trajectory 9 J. Morgan Muon g-2 Independent Design Review June

g-2 Extraction Trajectory 10 J. Morgan Muon g-2 Independent Design Review June

Identical pair of Lambertsons won’t work, would need offset field region in LAM2 11

Lambertson upstream, “C”-Magnet downstream 12

Candidate large aperture quadrupoles Pbar LQx (6.5”) magnet Extended aperture along poles ANL 8Qx (8”)magnet No extended aperture 13

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Changes to improve acceptance in extraction region Extraction kicker moved as far downstream as possible Potential conflict with Mu2e upstream electrostatic septa in dual-mode operation Kicker must be modified to increase strength (8.33Ω instead of 10Ω) for dual-mode 48 mm horizontal minimum separation required in Lambertson Large horizontal bump across extraction region Takes advantage of available physical aperture of large quadrupole at D2Q5 Four motorized quadrupoles (existing in Debuncher) used to create bump Either removed or greatly reduced for Mu2e Need 8 inch quadrupole at D2Q5 Pbar LQ magnet can almost work with current configuration Our only 10Qx magnet isn’t strong enough and is too tall The ANL 8Q32’s need to be refurbished C-magnet used in place of downstream Lambertson Beams are thread through only one Lambertson instead of two C-magnet aperture can be centered on extracted beam Much less stray magnetic field in Delivery Ring Allows lower trajectory through large quadrupole at D2Q5 15

D2Q5 large quadrupole 16

Quadrupole can be pitched to improve downstream aperture 17

Aperture improves as ELAM and ECMAG move closer to the 8Q32 In general, apertures are driven by g GeV/c muon beam, strength by 8.89 GeV/c Mu2e beam Lambertson has design bend angle of 38 mr, requiring 1.13 T-m of integrated field for the 8.89 GeV/c Mu2e beam “C”-Magnet has design bend angle of 57 mr, requiring 1.68 T-m of integrated field for the 8.89 GeV/c Mu2e beam Extraction devices under radiation shielding Cartoon of extraction devices and approximate lengths 18 Extraction magnets

Other magnet work in the near future and a problem B2 (GSJ) refurbishment, to replace the P-1 Line V714 C-Magnet Schedule shows initial planning through December, planning finishing up in January and work beginning at the end of February Work scheduled to take 5.5 months CDA refurbishment, to replace the AP-1 F-17 C-Magnets Schedule shows planning in January and February and work beginning at the end of February Work scheduled to take 5 months May have aperture problem with M-5 horizontal bend magnets Three horizontal bends of 154 mr each, 3.1 GeV/c beam Original plan calls for MDC magnets which can comfortably provide ~1.6 T-m Aperture a little tight after carefully considering the beam sagitta Could “inner” turns of MDC be removed to open up aperture (56 vs. 68 turns) 19