Accelerator Status and Plans Mary Convery g2 Operations

Accelerator Status and Plans Mary Convery g-2 Operations Readiness Review 2 October 2017

Muon Campus overview Recycler P 1, P 2, M 1 A tar P 0 ha get ll M 2 Delivery Rin g M 3 30 AP M 4 M 5 2 Accelerator Status and Plans | M Convery AP 50 0 AP 1 MC 1 (g-2 ) Mu 2 e 10/2/17

Beam to g-2 • Rebunch primary (8 Ge. V) protons in the Recycler so that rate in detectors is not too high, bunch length < ring revolution time of 147 ns Simulation of rebunched beam – 4 Booster batches every 1. 4 s rebunched into 4 bunches each • Create 3. 1 Ge. V secondary pions off the re-used Pbar target – Rep rate 0. 5 Hz 11 Hz requires new pulsed power supplies for lithium lens and pulsed momentum selection magnet (PMAG) 3 Accelerator Status and Plans | M Convery 10/2/17

• m+ to g 2 ring Beam to g-2 • As pions and protons travel down M 2/M 3 beamline and around Delivery Ring 4 times, ~all pions decay into muons, protons separate in time from muons and can be kicked out • Extract muons down M 4/M 5 line to g-2 ring • After ~4 turns, p separated in time from m+ • Kick into abort septum • 3 Ge. V p, p+, m+ • After ~4 turns almost all p+ decayed M 5 • Extract m+ for g-2 Injection septum • 3 Ge. V p, p+, m+ to Delivery Ring for g-2 • 3 Ge. V p, p+, m+ to M 3 line • 8 Ge. V protons to target 4 Accelerator Status and Plans | M Convery 10/2/17 4

Commissioning of beam to g-2 1) 8 Ge. V protons bypass target, through shared M 4 • If time also around Delivery Ring 2) 8 Ge. V protons to target, 3. 1 Ge. V secondaries to g-2 ring (100: 1 protons to muons) 3) 8 Ge. V protons to target, 3. 1 Ge. V secondaries around Delivery Ring, proton removal, muons to g-2 ring - after shutdown 5 Accelerator Status and Plans | M Convery 10/2/17

Commissioning milestones Projected Actual 6 Accelerator Status and Plans | M Convery 10/2/17

Commissioning successes 7 Proton re-bunching in Recycler 8 -Ge. V protons in Delivery Ring (orbits) Dump installed Target station lithium lens and PMAG pulsing 3. 1 Ge. V beam to storage ring Accelerator Status and Plans | M Convery 3 billion muons to storage ring within ± 0. 5% of desired momentum 10/2/17

Shutdown to-do list (in progress) • • Install new Delivery Ring pulsed septa magnets Commission target station power supplies for 100 Hz bursts Repair PWCs / Ion Chambers (Ar. CO 2 leaks and stuck motion) Install horizontal corrector magnets in M 3 and D 30 to help with DR injection • Inspect apertures in regions of unexpected high radiation/loss 8 Accelerator Status and Plans | M Convery 10/2/17

Install new Delivery Ring pulsed septa magnets • Production by TD was delayed due to vendor issues – Commissioned beam to g-2 using old Pbar septa which can’t pulse at full g-2 repetition rate • Magnets completed by Technical Division in August, then vacuum certification by AD • 1 st magnet installed (injection) • 2 nd magnet (abort) installation this week • Once installed can connect stripline to power supplies and start pulse testing 9 Accelerator Status and Plans | M Convery 10/2/17

Commission target station power supplies for 100 Hz bursts • New power supplies for lithium lens and pulsed momentumselection magnet (PMAG) needed to meet the 11. 4 -Hz average / 100 -Hz burst repetition rate • Ran in single-pulse mode for commissioning before shutdown • Test pulsing at design current of 24 k. A, one 100 -Hz burst of 8 pulses every 5 s (1. 6 Hz ave) • Will work up to two bursts of 8 every 1. 4 s (11. 4 Hz ave) • Single-point LOTO prevents pulse testing while in Transport enclosure 10 Accelerator Status and Plans | M Convery 10/2/17

Repair PWCs / Ion Chambers • Mechanical issues with motion in and out of beam – Replace screws on anti-vacuum box with lower profile to prevent scraping/binding • Vacuum issues – – Ar. CO 2 leaks Replace Ar. CO 2 tygon tubing with aluminum tubing Install aluminum lines for nitrogen purge New o-rings for the top plate and vacuum top plate Progress through 27 repair steps for 25 devices 11 Accelerator Status and Plans | M Convery 10/2/17

Install horizontal corrector magnets in M 3 and D 30 • Not enough horizontal trims in downstream M 3 and D 30 for proper closure of first turn on closed orbit injection kicker C magnet septum magnet VT 747 HT 750 HT 746 VT 306 M 3 DR 12 Accelerator Status and Plans | M Convery 10/2/17

Inspect apertures in regions of unexpected high radiation • Measured high residual radiation in places we would not expect to lose beam • Opened up beam pipe to look for obstructions but none found • Will factor into optics tuning when start up after shutdown – Have enlisted help of APC 13 Accelerator Status and Plans | M Convery 10/2/17

Commissioning to-do list • Commission proton removal – Has been demonstrated – Optimize beam transmission around Delivery Ring • Commission full-power beam – 16 bunches of 1012 protons every 1. 4 s – Recycler 2. 5 MHz RF rebunching – Target station and Delivery Ring pulsed devices • Optimize DR injection with new septum magnet • Optimize M 4/M 5 line beam transmission • Investigate target station yield vs spot size 14 Accelerator Status and Plans | M Convery 10/2/17

Commission proton removal • Proton removal demonstrated to work Muon beam profiles at inflector entrance • But beam transmission around Delivery Ring is poor at 3. 1 Ge. V (ok at 8 Ge. V) – Concept is fundamentally sound, but something is not working properly, both orbit and optics are affected – Unable to use all of the diagnostics available at 8 Ge. V for lower -intensity 3. 1 Ge. V beam – Injection / extraction issues may be contributing significantly – Have enlisted help of APC 15 Accelerator Status and Plans | M Convery 10/2/17

Recycler 2. 5 MHz rebunching • One proton removal is complete, we can run higher intensity protons on target • Will continue commissioning of bunch time structure 120 ns rebunch 1 batch into 4 bunches 16 Accelerator Status and Plans | M Convery 10/2/17

Commission full-power beam • Two Booster batches injected into Recycler, rebunched into 8 bunches (takes 90 ms), and extracted in 10 ms intervals • Twice per 1. 4 s cycle • Need: more commissioning of Recycler RF, target station power supplies commissioned for 100 -Hz bursts, new Delivery Ring pulsed septa magnets So far rebunch 1 batch into 4 bunches: 1 3 to to Recycler g-2 abort 17 Accelerator Status and Plans | M Convery 10/2/17

Optimize DR injection with new septum magnet • Observed DR horizontal orbit distortion which does not fit well to optics model and suggests 7° roll on injection septum • Alignment rechecked and saw no roll, visually inspected and looked ok (below) • New septum magnets being installed during shutdown • Additional correctors in M 3 and D 30 will help steering Injection septum as installed FY 17 run 18 Accelerator Status and Plans | M Convery 10/2/17

Optimize M 4/M 5 line beam transmission • Poor efficiency between upstream M 4 and end of M 5 based on Ion Chambers • Both the vertical and horizontal bending regions are complicated, sensitive optics and small apertures • Beam widths on profile monitors are close to what is expected 19 Accelerator Status and Plans | M Convery 10/2/17

M 5 line / injection tuning • Working together with g-2 storage ring experts to tune the M 5 line for optimal injection into the ring 20 Accelerator Status and Plans | M Convery 10/2/17

Investigate target station yield • Achieving smaller spot size of sx =sy=0. 15 mm could improve yield by 5 -10% • Currently sx =0. 25 mm sy =0. 30 mm • Expect to take a lot of work 21 Accelerator Status and Plans | M Convery 10/2/17

Schedule • Re-establish beam after shutdown (1 -2 weeks depending on whethere are issues with upstream accelerators) • Commission proton removal (several weeks) • Commission full repetition rate • Optimize for maximum intensity • Detailed run plan (subject to change) – week of Oct 23: upstream accelerators turn on – week of Oct 30: establish beam to Muon Campus – week of Nov 6: DAY/EVE work on Delivery Ring orbits and proton removal, OWL lowrate mixed beam (100: 1 protons to muons) to experiment if desired – week of Nov 13: DAY/EVE work on Delivery Ring orbits and proton removal, OWL lowrate mixed beam to experiment if desired – week of Nov 20: DAY/EVE work on Delivery Ring orbits, proton removal, and increasing rep rate, OWL low-intensity muon beam to experiment if desired – week of Nov 27: DAY/EVE work on increasing rep rate, OWL muon beam to experiment – Dec: muon beam to experiment while working on rep rate and efficiency – Jan: muon beam to experiment 22 10/2/17

Projected beam delivery ~20 -27 months at full operational beam power to reach 4 x 1020 POT • Assuming sufficient funding to operate accelerators 23 Accelerator Status and Plans | M Convery 10/2/17

AD support for muon operations / maintenance • • 5. 8 FTE Muon Dept 3. 3 FTE Mechanical Support 5. 2 FTE EE Support 0. 5 FTE Target Systems – Expected lifetime of components longer than lifetime of experiment Component Spares Target 1 (old design) Lens 3 (externally cooled transformer) PMAG 2 Muon Dept Personnel Effort Morgan, Jim * Stratakis, Diktys + Annala, Jerry Drendel, Brian Still, Dean Vander Meulen, Dave Budlong, Jim Sondgeroth, Al Nagaslaev, Vladimir Werkema, Steve 0. 95 0. 82 0. 77 0. 71 0. 59 0. 57 0. 50 0. 22 0. 11 *Managed g-2 beamline construction and commissioned beamlines +Leading beam physics effort • Also have at least one spare of each type of magnet, DC power supply, and instrumentation device • Pulsed power supplies have spare parts • Don’t have spares for some specialty beampipe components 24 Accelerator Status and Plans | M Convery 10/2/17

Summary • Had good success with FY 17 commissioning run – Accomplished all pre-shutdown goals – Delivered beam to storage ring for detector commissioning • Executing the plan for repairs and improvements during shutdown • Will resume commissioning after shutdown • Expect to be delivering 24 x 7 physics-quality beam to experiment roughly 6 weeks after shutdown 25 Accelerator Status and Plans | M Convery 10/2/17