Spectroscopy

ElectronicHydrogen MuonicHydrogen.876±.008fm .8409±.0004fm

InanefforttohelpsolvetheProtonRadiusPuzzle,the MUon proton Sca:ering Experiment (MUSE)will be the first to simultaneously extract theradius from ep andμp sca:ering under idenFcalcondiFons. During June ’17 I traveled to PSI, inSwitzerland,tobuildandtestastrawtubetrackerduringaprototypingphaseoftheexperiment.

IntroductionIworkedwith the chief designer tobuild anSTTprototypewith160strawtubes.ThegoalforthisdetectoristoefficientlymeasuredriRFme.DatafromJune’17isbeinganalyzedtoassessthequalityoftheprototype.

Objective

Straws inflatethetubeswith a mixture of 90%argon and10%CO2 gasto 1 atmosphere abovestandard pressure toprovide mechanicalstability.ParFclesionizegas inside the strawtube, creaFng a signalattheanodewire.

Results & ConclusionApproach

ParFcle

Sca?eringElectron-Proton(ep)Muon-Proton(μp).877±.006fm ???

Fig.1:PuzzledataandMUSEdetectorareasetup

Fig.3:Allstrawtubecomponents Fig.4:ParFcletravelingthroughcrosssecFonofastrawtube

Fig.6:ThreeexamplesofparFcletrajectorythroughastrawtube,andindicatorsofcorrespondingdriRFme

Fig.2:STTinπM1beamline

AJune‘17driRFmeplotisshown.Ideallytheplotwill havea “sharkfin” shape, featuringaclearrangeofminimumtomaximumdriRFmeandlownoiseinterferenceoutside.Thegasmixture and all straw tubematerials seemedto be reliable and efficient. CoordinaFngconstrucFonwithsoRwaremappingpresentedsomechallengesandwillneedtobemasteredbefore official data collecFon begins. Oncemapping was resolved, the data lookedpromising. The analysis soRware successfullyreconstructedparFcletracksandalldataplots.

ClosetowireClosetowall

Average

Fig.5:Run291,Plane1DriRTime