The$Mu2e$Project,$ Commissioning,$ &Physics$Schedule · −Some#are#captured#in#Project#Risk#Register;#managed#by#the#Project;#affects#Project#schedule −Some#are#captured#in#Operations#Risk#Register,#managed#by#the#Collab/Lab

The Mu2e Project, Commissioning,

& Physics ScheduleD. Glenzinski, J. Miller, R. Ray, J. Whitmore

Proton Planning Group Meeting01 December, 2016

01 December, 2016 D. Glenzinski -‐ FNAL PPMG 1

Prologue

• This talk aims to:−Socialize a wider audience about the implications decisions in the past have had on the Mu2e Schedule (Project + Commissioning + Physics)

−Highlight the effects of introducing a significant delay into the schedule (e.g. via an extended accelerator shutdown)

−Initiate a discussion among all relevant parties to arrive at a program plan that works for everyone


Prologue

• Mu2e is a very challenging experiment− Aims to improve current state-‐of-‐the-‐art by a factor of 104−Utilizes a novel secondary beamline to produce the world’s hottest stopped muon source (currently PSI achieves ~108 µ/s, our design ~1010 µ/s)

−Utilizes resonant extraction to provide a pulsed proton beam−Requires 3 separate superconducting solenoids to work in unison−Requires well controlled, narrow (+/-‐ 125 ns full width) protons pulses−Requires out-‐of-‐time protons to be suppressed by 1010 rel. to in-‐time protons −Requires high-‐performance detectors working in vacuum at high rates

• Mu2e carries significant technical risk−Some are captured in Project Risk Register; managed by the Project; affects Project schedule−Some are captured in Operations Risk Register, managed by the Collab/Lab−We anticipate a lengthy Commissioning period


Concerning the Mu2e Project KPPs

• The project KPPs require−Solenoids powered to their nominal settings−Beamline elements installed and powered to their nominal settings−Detectors to have collected cosmic ray events in “garage” position

• Thus, at Project Complete−The solenoids have not yet been mapped with precision−Beam has not yet been delivered to the Mu2e production target−The detectors have not yet operated in vacuum with beam−These things are true for both Threshold and Objective KPPs


Concerning the Mu2e Project KPPs

• The project KPPs require−Solenoids powered to their nominal settings−Beamline elements installed and powered to their nominal settings−Detectors to have collected cosmic ray events in “garage” position

• Thus, at Project Complete−The solenoids have not yet been mapped with precision−Beam has not yet been delivered to the Mu2e production target−The detectors have not yet operated in vacuum with beam−These things are true for both Threshold and Objective KPPs


In other words:Project Complete != Experiment Ready for Beam

Project Complete != Accelerator Ready to Deliver High Quality Beam

What Mu2e looks like at Project Complete


• Still missing: External shielding ( ~1000 tons, 100 blocks), Overhead hatch shielding (~2100 tons, 370 blocks), Cosmic Veto System (60 tons, 325 m2, mounts to external shielding), Stopping Target Monitor (installed behind DS), Final focus region of the beamline. Tracker, Calorimeter in “garage position”.

Lower Level

What Mu2e needs to look like prior to beam

• View of the lower level – Ready for beam01 December, 2016 D. Glenzinski -‐ FNAL PPMG 7

What Mu2e needs to look like prior to beam

• View of the upper level – showing a partial installation of hatch blocks01 December, 2016 D. Glenzinski -‐ FNAL PPMG 8

Mu2e Schedule

• Project schedule from P6 – currently 22 months of float remain• Commissioning schedule – 12-‐18 months based on rough estimate• Physics schedule – strawman example


Mu2e Schedule – Project notes

• Taken from P6 scheduling tool−Rigorously planned, resource loaded, matched to funding profile, etc.

• Generally speaking, Mu2e project has 3 distinct paths proceeding in parallel (until the end when it all comes together)−Fabrication and initial commissioning of the solenoids−Fabrication and initial commissioning of the detector sub-‐systems−Construction, assembly, and initial installation of beam line elements−A significant delay in any one of these can push “KPPs Complete” to later date


Mu2e Schedule – Commissioning notes • Once KPPs are achieved, we have ~12 months of work before we’re ready to deliver beam to the production target. Driven by 2 separate paths proceeding in parallel:

1) Readying the Mu2e apparatus for beam−Complete precision field maps à Final alignment of the solenoids à Installation of external shielding à Final installation of detector systems à Commissioning in vacuum

2) Readying the beam−Can proceed in parallel with 1) by utilizing a diagnostic dump upstream of Mu2e−Commission single-‐turn extraction to diagnostic dump à Install septa and associated shielding à Commission resonant extraction to diagnostic dump à Install final focus region

−Commissioning durations reflect the technical challenges associated with achieving the required performance parameters

• Once these are done we begin commissioning the apparatus with beam

• We estimate this entire sequence has a +6 month uncertainty associated with it


Mu2e Schedule – Physics notes• To achieve our target sensitivity, Mu2e requires:

−7 x 1017 stopped muons on our aluminum stopping target−Using latest production models, this requires ~4 x 1020 POT (on tungsten production target)−This takes 3 years of running at design intensity (assuming 2 x 107 s/yr of run time)−Special runs for detector calibration and background studies add another ~1 year of run time

• Our competition:−Current world’s best limit (Sindrum-‐II): Rµe < 6 x 10-‐13 @ 90% CL−COMET Phase-‐I expects ~ 6 x 10-‐15 by ~2021

• Not including the additional run time for calibrations and background studies:−Mu2e achieves a Single-‐event-‐sensitivity (SES) of ~10-‐15 in ~7 days at full intensity−… SES of ~10-‐16 in ~70 days at full intensity−… Target sensitivity of ~10-‐17 in 3y of running (assuming 2 x 107 s/yr of run time)

• Physics schedule on pg 9 assumes no problems arise


Mu2e Schedule – take aways

• Mu2e will need sustained periods of uninterrupted accelerator run time to commission resonant extraction prior to delivering beam to the experiment−Currently scheduled to begin Q3 of FY2020 and end Q4-‐FY2021.

• Estimate another 6 months required to commission beam to target and to commission detector operations with beam−Currently scheduled Q1-‐FY2022 – Q2-‐FY2022

• Expect Mu2e physics data taking to begin mid-‐FY2022


Mu2e Schedule – take aways

• Mu2e needs 4 years at full intensity to achieve target sensitivity−3 years of physics data taking−+1 yr (33%) additional running for calibration and special background runs−There are intermediate breakpoints that provide datasets sufficient to reach interesting intermediate sensitivities

• Including beam commissioning, detector commissioning, physics data taking and calibration running, Mu2e will need beam for ~6 years.

• Mu2e will be taking data into the latter half of the 2020s−Schedule on pg 9 has Mu2e running to end of FY2026−Schedule on pg 9 assumes no significant problems arise along the way


Summary

• A significant accelerator shutdown in the early 2020s coincides with final Mu2e beam commissioning and first physics and would cause a significant delay in obtaining first physics.

• A significant delay in obtaining first physics would be extremely disruptive−Especially detrimental for Mu2e graduate students and post-‐docs−Puts us at a disadvantage relative to COMET−Having made significant investments in Mu2e, the DOE, our International Partners, and our University Colleagues will be anxious to see physics results

• We would like to work with LBNF & laboratory to develop a solution that works for all parties involved


Documents

The$Mu2e$Project,$ Commissioning,$ &Physics$Schedule · −Some#are#captured#in#Project#Risk#Register;#managed#by#the#Project;#affects#Project#schedule −Some#are#captured#in#Operations#Risk#Register,#managed#by#the#Collab/Lab