InitialThoughtsonBeam RequirementsforRareKDecay - - PowerPoint PPT Presentation

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May 04, 2023 482 likes •696 views

InitialThoughtsonBeam RequirementsforRareKDecay ExperimentsatProjectXICD&2 2/8 DouglasBryman UniversityofBritishColumbia + + +

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DouglasBryman UniversityofBritishColumbia

2/8

InitialThoughtsonBeam RequirementsforRareKDecay ExperimentsatProjectXICD&2

SLIDE 2

ICD&2ResearchProgramTaskForceReport2009 Fermilab Proposal996

π νν

+ + +

→

SLIDE 3

SecondaryK+Beam

#$$%&' ( ) *"+,'

--./0

1& )"'"'2%3/ 1& )"'"*'2-+-3/ 41!&*5 !1$,$6 $"+')+./0

SLIDE 4

P996Beam– J.Doornbos

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Pion Contamination:K/pi~3

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.7)&8"-9

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With10xbeampowertoburn…

Reducemomentumto≤500MeV/c

However… needupstreamphotonveto

Reducebeamsizeanddivergence

Possibleimprovementintotal momentumresolutionwithsmaller target

lengthofseparatorstoimprovepi

rejection;ordevelopimprovedseparators

π νν

+ +

→

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!"#$% &&'

('('#)(% * ('"$) + ()$($)( π π π γγ π

→
→
,
.
π νν

→

/ #

π νν

→

<50ps

SLIDE 9

10mlongNeutralBeamforKOPIOat~43degrees

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% ,/01(23 42$

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KOPIOChallenge#1:Beamline

5 Complex,costly

seriesofcollimators 5 3largesweeping magnets

5 Plentyofaperture

forparticlescreated upstreamtoreach fiducial region 5“Difficult” vacuum vessel

L.Littenberg

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2/ /-)'2 /

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Hajime Nanjo ()

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Hajime Nanjo ()KAON09 ExpectedS/N~1

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Hajime Nanjo ()

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Hajime Nanjo ()

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Hajime Nanjo ()

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ProjectXICD&2:Timestructure idealforTOF&basedexperiment.

π νν

→

Highintensityallowssmallbeamdimensions(likeKOTO):

“Difficult” vacuumvesseldisappears

Geometricacceptancemaximized;symmetryrestored
2&DbeamkinematicconstraintincreasesS/B
Upstreambackgrounds,backgroundsinthefiducial volumereduced
Samemicro&buncheventspoilagereduced
Randomvetoesreducedduetohighdutyfactor
Beamvetomaybeunnecessary

(See2008ProjectXworkshoptalksbyL.Littenberg,S.Kettell) ICD&2TaskForceReport

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Kaon Spectra

Atproduction Atexperiment

:- ;9<7'''= 3"

50ps pulses 200ps pulses

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WithKflux10xAGS:

Usethepencilbeamapproachbutmakeit

shorterthanKOTO’s beam:likelyfeasible

UseTOFmeasurementsandpointing

calorimetertopummelbackgrounds

~200events/yr“plausible” ifacceptanceof

O(10)xKOPIOcanbeachieved

π νν