Muon g-2 Inflector AEM Meeting 11/25/2013 Chris Polly Muon g-2 Project Manager

Muon g-2 Inflector 2 outer coil yoke coil Inflector used to bring beam from outside storage ring and onto an interior orbit 11 November 2013 Chris Polly All Experimenters Meeting

Pictures 3 Closed windings cause multiple scattering -> beam blows up and about half of muons lost About 2m long and as big around as a football Inserted inside cryostat that is part of a special vacuum chamber 11 November 2013 Chris Polly All Experimenters Meeting

Technically challenging 4 - Geometrically tight region - Large Lorentz forces when magnet is powered - Has to produce 1.5T bucking field to cancel main field - Can’t perturb muon storage ring by more than ~1ppm so whole thing is wrapped in a superconducting shield - Coil winding has to be self- cancelling to the point that the stray fields don’t saturate the superconducting shield - Design interfaces with optics of final beamline 11 November 2013 Chris Polly All Experimenters Meeting

Simulated improvements 5 - Have known about this factor of 2 from back-of-the-envelope calculations used in the proposal - Have since developed a full Geant 4 model of the ring - Some very nice work by Thomas Gadfort has confirmed the potential gains 11 November 2013 Chris Polly All Experimenters Meeting

Reminder of rates at FNAL 6 Achieving required statistics is a primary concern - Need a factor 21 more statistics than BNL - Beam power reduced by 4 Need a factor of 85 improvement in integrated beam coming from many other factors - Collection of pions from lens - Capture of decay muons in FODO channel - p π closer to magic momentum - Longer decay channel - Increased injection efficiency - Earlier start time of fits - Longer runtime What is a new inflector worth? - Estimate ~$3M/yr operation cost - Hard to put a price on expanded physics scope Ratio of beam powers BNL/FNAL: 4e12 protons/fill * (12 fills / 2.7s) * 24 GeV 1e12 protons/fill * (16 fills / 1.3s) * 8 GeV = November 2013 Chris Polly All Experimenters Meeting

So why is a new one needed? 7 1) If for some reason we don’t achieve all of the rate factors assumed in the prior page then this extra factor of 2 might be the only thing saving the experiment from significant additional operating costs and years of run time. 2) The existing inflector represents a single point of potential failure with no backup. Had developed a He leak in E821 which we think is in the lead can and should be repairable, but not conclusively shown at this point. 3) Even if all of the other beam improvements come through, we can use the factor of 2 in rate to do more physics. Options included - Reducing the error on the μ- experiment by another sqrt(2) if systematics are shown to be controlled at better-than-expected level - Better collimation of muon beam to be in region where magnetic field is more uniform - Re-running μ- measurement a second time with a different set of environmental conditions to verify systematics are understood - Run the experiment with μ+ for a test of CPT violation 11 November 2013 Chris Polly All Experimenters Meeting

Status 8 - Rough estimate $ M - Not in baseline plan shown at CD-1 because conceptual design did not exist - Included in risk registry as $1.5M +/0 $0.5M risk with 25-75% probability - We were hoping that the UK would get funded to be a major player in developing this intellectually challenging and important piece of equipment - Found out that the UK did get approved for $1.8M in funding for straw tracking, but STFC rejected the portion having to do with inflector - Still some possibility for foreign investment from UK or Korea, but we have to make this happen ourselves - Have hired Brett Parker and BNL group to lead winding design - Need to identify who at FNAL can be responsible for leading the effort to produce the fully-integrated device and be responsible for it during operations 11 November 2013 Chris Polly All Experimenters Meeting

BNL winding technology 9 - Rough estimate $ M - Not in baseline plan shown at CD-1 because conceptual design did not exist - Included in risk registry as $1.5M +/0 $0.5M risk with 25-75% probability - We were hoping that the UK would get funded to be a major player in developing thi 11 November 2013 Chris Polly All Experimenters Meeting

Schedule presented at DOE CD-1 CD-0 Forecast Objective KPPs Satisfied CD-1 CD-2/3a CD-3 Conceptual Design Prelim Design Prelim Design CD 3a Work Final Design Final Design Ring/Field/Detector Implementation Accelerator Implementation Close- out CD-4 Forecast Includes controls to MC-1 bldg, possible advancement of D30 straight reconfiguration xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff Ring & Detectors Ready for Ops Accelerator Complete MC-1 Building Design and Construction Ring Reassembly Construction of NSF/Early Career funded detector components xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff LX3: MC-1 BO, Start Ring Reassembly LX3: Cryo Plant Ready, Cool Ring xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff Cool- Down Field Shimming Install vacuum chambers, equipment in gap, align, establish vacuum Install remaining ring & detector subsystems Controls to MC-1 Accelerator Beamlines, Target, Controls, Safety Systems 11 November 2013 Chris Polly All Experimenters Meeting 10

Schedule presented at DOE CD-1 CD-0 Forecast Objective KPPs Satisfied CD-1 CD-2/3a CD-3 Conceptual Design Prelim Design Prelim Design CD 3a Work Final Design Final Design Ring/Field/Detector Implementation Accelerator Implementation Close- out CD-4 Forecast Includes controls to MC-1 bldg, possible advancement of D30 straight reconfiguration xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff Ring & Det. Ready for Ops Accelerator Complete MC-1 Building Design and Construction Ring Reassembly Construction of NSF/Early Career funded detector components xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff LX3: MC-1 BO, Start Ring Reassembly LX3: Cryo Plant Ready, Cool Ring xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff xNatalie ZaysoffxNatalie Zaysoff Cool- Down Field Shimming Install vacuum chambers, equipment in gap, align, establish vacuum Install remaining ring & detector subsystems 11 November 2013 Chris Polly All Experimenters Meeting 11