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MEG Beam Line StudiesMEG Beam Line Studies
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Outline of Topics to be Outline of Topics to be AddressedAddressed
• Status at the time of the last ReviewStatus at the time of the last Review
• Beam Time April/May 2003 “Z-Branch”Beam Time April/May 2003 “Z-Branch”
• Beam Transport Solenoid BTSBeam Transport Solenoid BTS
• FutureFuture
• Summary/ConclusionsSummary/Conclusions
• Beam Line ScheduleBeam Line Schedule
• Area Layout Area Layout
• Status at the time of the last ReviewStatus at the time of the last Review
• Beam Time April/May 2003 “Z-Branch”Beam Time April/May 2003 “Z-Branch”
• Beam Transport Solenoid BTSBeam Transport Solenoid BTS
• FutureFuture
• Summary/ConclusionsSummary/Conclusions
• Beam Line ScheduleBeam Line Schedule
• Area Layout Area Layout
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Status at the Last ReviewStatus at the Last Review
Milestone achieved on scheduleMilestone achieved on schedule• Viable Solution for the MEG Beam Line FOUNDViable Solution for the MEG Beam Line FOUND using “Z”-Branch with separate stages for using “Z”-Branch with separate stages for
Particle SeparationParticle Separation && Momentum DegradationMomentum Degradation viavia 2 triplets2 triplets ++ WIEN FilterWIEN Filter + Solenoid/Degrader system+ Solenoid/Degrader system
• Rudimentary work on Transport Solenoid BTS Rudimentary work on Transport Solenoid BTS had just startedhad just started
initial lengthinitial length ~180cm? with B~0.5T?~180cm? with B~0.5T? Warm or Cold? etc.Warm or Cold? etc.
• Solenoid + Degrader & Stop Distribution measurements Solenoid + Degrader & Stop Distribution measurements plannedplanned
Final part Phase C of “Z”-Branch Measurements Final part Phase C of “Z”-Branch Measurements April/May 2003April/May 2003
Milestone achieved on scheduleMilestone achieved on schedule• Viable Solution for the MEG Beam Line FOUNDViable Solution for the MEG Beam Line FOUND using “Z”-Branch with separate stages for using “Z”-Branch with separate stages for
Particle SeparationParticle Separation && Momentum DegradationMomentum Degradation viavia 2 triplets2 triplets ++ WIEN FilterWIEN Filter + Solenoid/Degrader system+ Solenoid/Degrader system
• Rudimentary work on Transport Solenoid BTS Rudimentary work on Transport Solenoid BTS had just startedhad just started
initial lengthinitial length ~180cm? with B~0.5T?~180cm? with B~0.5T? Warm or Cold? etc.Warm or Cold? etc.
• Solenoid + Degrader & Stop Distribution measurements Solenoid + Degrader & Stop Distribution measurements plannedplanned
Final part Phase C of “Z”-Branch Measurements Final part Phase C of “Z”-Branch Measurements April/May 2003April/May 2003
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Measurements:Measurements: Phase B – post Triplet 2 & CollimatorPhase B – post Triplet 2 & Collimator Phase C – post SolenoidPhase C – post SolenoidSeveral unexpected problems encountered & Solved !!!Several unexpected problems encountered & Solved !!!
Measurements:Measurements: Phase B – post Triplet 2 & CollimatorPhase B – post Triplet 2 & Collimator Phase C – post SolenoidPhase C – post SolenoidSeveral unexpected problems encountered & Solved !!!Several unexpected problems encountered & Solved !!!
““Z-Branch” Measurements Z-Branch” Measurements April/May2003April/May2003
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April/May 2003 Beam Test cont.April/May 2003 Beam Test cont.Total of 4 Weeks Total of 4 Weeks of Beam Time:of Beam Time:
1 week Phase B1 week Phase B 3 weeks Phase C3 weeks Phase C
PROBLEMS:PROBLEMS:• 3 Days Accelerator Down3 Days Accelerator DownPlanned forPlanned for
• Solenoid Fringe-field Solenoid Fringe-field distorts optics between distorts optics between Triplet 2/Collimator & SolenoidTriplet 2/Collimator & SolenoidExtra vacuum pipe between Collimator & Solenoid Extra vacuum pipe between Collimator & Solenoid SOLVED !!!SOLVED !!!
• WIEN Filter DOWN for nearly ALL Phase C measurementsWIEN Filter DOWN for nearly ALL Phase C measurements due to HV-insulation Problems at Cable feed-through (OIL)due to HV-insulation Problems at Cable feed-through (OIL)Measurements done without Separator Measurements done without Separator FULL e FULL e++ beam beam
• NaI found to have NO Magnetic Shielding – solenoid stray fieldNaI found to have NO Magnetic Shielding – solenoid stray fieldBuilt Magnetic Shielding Box Built Magnetic Shielding Box SOLVED !!!SOLVED !!!
CONSEQUENCECONSEQUENCE 2-Day 2-Day -Beam Test Cancelled -Beam Test Cancelled
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Results “Z-Branch Results “Z-Branch Measurements”Measurements”Triplet 2Triplet 2
11
SolenoidSolenoidWIENWIEN
FilterFilter
ColliColli..TripTrip..µµ++
ee++ee++µµ++
Phase APhase APhase APhase A
Integrated RateIntegrated Rate4cm Tg.E @ 18004cm Tg.E @ 1800µAµA
NNµµ~1.3·10~1.3·1088 µ µ++/s/s(2.3·10(2.3·1088 µ+/s 6cm Tg.) µ+/s 6cm Tg.)
Integrated RateIntegrated Rate4cm Tg.E @ 18004cm Tg.E @ 1800µAµA
NNµµ~1.3·10~1.3·1088 µ µ++/s/s(2.3·10(2.3·1088 µ+/s 6cm Tg.) µ+/s 6cm Tg.)
P-Spectra:P-Spectra:-Kinematic Edge-Kinematic Edge (29.79 MeV/c)(29.79 MeV/c)
Theoretical func.Theoretical func.PP3.53.5 folded with folded withGaussian Gaussian ΔΔP/P +P/P +Const. Cloud Const. Cloud µµ++
contributioncontribution
““U-Branch”U-Branch”
““Z-Branch”Z-Branch”PPcentcent=(28.2=(28.2±0.1)MeV/c±0.1)MeV/cΔΔP/P =(7.9P/P =(7.9±0.6)%±0.6)% FWHM FWHM
PPBeamBeam=(28.2±0.9)MeV/c=(28.2±0.9)MeV/cConsistent withConsistent with
TURTLE &TURTLE &P-Slit settings/Calib.P-Slit settings/Calib.
““Z-Branch”Z-Branch”
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Phase B Separation QualityPhase B Separation QualityTriplet 2Triplet 2
11
SolenoidSolenoidWIENWIEN
FilterFilter
ColliColli..TripTrip..µµ++
ee++ee++µµ++
Phase BPhase BPhase BPhase B
µµ++
ee++
Integrated RateIntegrated Rate4cm Tg.E @ 18004cm Tg.E @ 1800µAµANNµµ~8.5·10~8.5·1077 µ µ++/s/s
(1.5·10(1.5·1088 µ+/s 6cm Tg.) µ+/s 6cm Tg.)
Integrated RateIntegrated Rate4cm Tg.E @ 18004cm Tg.E @ 1800µAµANNµµ~8.5·10~8.5·1077 µ µ++/s/s
(1.5·10(1.5·1088 µ+/s 6cm Tg.) µ+/s 6cm Tg.)µ/e µ/e SeparationSeparation
11.8cm 7.211.8cm 7.2σσ !!! !!!µ/e µ/e SeparationSeparation
11.8cm 7.211.8cm 7.2σσ !!! !!!
LowLowThresholdThreshold50mV50mV
Integrated RateIntegrated RateAfter SeparatorAfter Separator
4cm Tg.E @ 4cm Tg.E @ 18001800µAµA
NNµµ~9.4·10~9.4·1077 µ µ++/s/s(1.7·10(1.7·1088 µ+/s 6cm µ+/s 6cm
Tg.)Tg.)
NNee/N/Nµµ > 9 > 9NNee~ 8.7~ 8.7·10·108 8 ee++/s/s
Transmission Transmission FactorsFactors
TTSepSep= (71±5)%= (71±5)%TTColliColli= (90±5)%= (90±5)%
Integrated RateIntegrated RateAfter SeparatorAfter Separator
4cm Tg.E @ 4cm Tg.E @ 18001800µAµA
NNµµ~9.4·10~9.4·1077 µ µ++/s/s(1.7·10(1.7·1088 µ+/s 6cm µ+/s 6cm
Tg.)Tg.)
NNee/N/Nµµ > 9 > 9NNee~ 8.7~ 8.7·10·108 8 ee++/s/s
Transmission Transmission FactorsFactors
TTSepSep= (71±5)%= (71±5)%TTColliColli= (90±5)%= (90±5)%
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Phase C Post SolenoidPhase C Post Solenoid
Remember !!! PSC only a Test SolenoidRemember !!! PSC only a Test Solenoid
PSC-Solenoid 20cm BorePSC-Solenoid 20cm BoreBeam Line 32 cm BoreBeam Line 32 cm Bore
Remember !!! PSC only a Test SolenoidRemember !!! PSC only a Test Solenoid
PSC-Solenoid 20cm BorePSC-Solenoid 20cm BoreBeam Line 32 cm BoreBeam Line 32 cm Bore
Triplet 2Triplet 2
11
SolenoidSolenoidWIENWIEN
FilterFilter
ColliColli..TripTrip..µµ++
ee++ee++µµ++
Integrated RateIntegrated RateAfter SolenoidAfter Solenoid
4cm Tg.E @ 4cm Tg.E @ 18001800µAµA
NNµµ~6.1·10~6.1·1077 µ µ++/s/s(1.1·10(1.1·1088 µ+/s 6cm µ+/s 6cm
Tg.)Tg.)
Beam Spot:Beam Spot:σσXX ~ 5.3 mm ~ 5.3 mmσσYY~ 6.5 mm~ 6.5 mm
Transmission Transmission Factor SolenoidFactor Solenoid
TTSolSol= 71 %= 71 %
Integrated RateIntegrated RateAfter SolenoidAfter Solenoid
4cm Tg.E @ 4cm Tg.E @ 18001800µAµA
NNµµ~6.1·10~6.1·1077 µ µ++/s/s(1.1·10(1.1·1088 µ+/s 6cm µ+/s 6cm
Tg.)Tg.)
Beam Spot:Beam Spot:σσXX ~ 5.3 mm ~ 5.3 mmσσYY~ 6.5 mm~ 6.5 mm
Transmission Transmission Factor SolenoidFactor Solenoid
TTSolSol= 71 %= 71 %
Single Node SNMSingle Node SNMSingle Node SNMSingle Node SNM
Double Node DNMDouble Node DNMDouble Node DNMDouble Node DNM
Previous Excitation Previous Excitation Curve DNM confirmedCurve DNM confirmed DNM focus ZDNM focus Z00 14.53 A 14.53 APrevious U-Branch Previous U-Branch 14.56 A14.56 A With larger Bore i.e. BTS T>71%With larger Bore i.e. BTS T>71%
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Degrader & Stopping Distribution Degrader & Stopping Distribution MeasurementsMeasurements
µµ++
CHCH2 2 TgTg
ee++Foils CHFoils CH22
at focusat focus
Michel Range Curve using NaI:Michel Range Curve using NaI:
Measurement Measurement Simulation SimulationFix Degrader 600 µ Fix Degrader 600 µ Geant say 580µGeant say 580µNearly all Stopped in 400µNearly all Stopped in 400µ
R ~ 870 R ~ 870 µ CHµ CH22
DegraderDegrader
TargetTarget
AIRAIR
Target Thickness vs. NaI RateTarget Thickness vs. NaI Rate
VACVAC
TargetTarget
GivesGives RRMeanMean = 1150 = 1150µµEquiv GEANT + TRIMEquiv GEANT + TRIM88% STOP in 400µ 88% STOP in 400µ Tg !!!Tg !!!
SolenoidSolenoid
Fix DegraderFix DegraderVar. TgVar. Tg
88% stopped88% stoppedin 400in 400µ CHµ CH22 Tg. Tg.
P.-R. KettleP.-R. Kettle MEG Review July 2003MEG Review July 2003 1010
Beam Transport Solenoid BTSBeam Transport Solenoid BTS
Design in conjunction with NovosibirskDesign in conjunction with Novosibirsk + PSI Magnet Group + Tokyo+ PSI Magnet Group + Tokyo Superconducting solution ChosenSuperconducting solution ChosenPresent Design under studyPresent Design under studyLLCRYO CRYO = 2800 mm= 2800 mmLLCOILSCOILS = 2630 mm = 2630 mmDDBOREBORE = 320 mm = 320 mmBBCENTCENT = 0.347 T = 0.347 TOptics + further simulations underwayOptics + further simulations underway
Modified COBRA Axial Bfield
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
50 70 90 110 130 150 170 190 210 230 250
Axial Distance from COBRA centre {cm}
Axi
al B
field
{T}
COBRA Bfield
COBRA(+)Tran SOL(+)
Trans. Sol.
COBRA(+)Tran Sol(-)
BTSBTS
COBRACOBRA
BTSBTS
COBRACOBRA
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Future Future
Priorities:Priorities:
•Finish simulations for design BTS Finish simulations for design BTS end Julyend July
•Complete BTS Design together with Novosibirsk, PSI, TokyoComplete BTS Design together with Novosibirsk, PSI, Tokyo Manufacture + Delivery by late Spring 2004Manufacture + Delivery by late Spring 2004
•Start Design for new Triplet 1 Wagon + Quads (Start Design for new Triplet 1 Wagon + Quads (µE4 Beam)µE4 Beam) ready for Insertion Shutdown 2003/2004ready for Insertion Shutdown 2003/2004
•Start Design of Target System for Experiment & choose optimal Start Design of Target System for Experiment & choose optimal Degrader positioningDegrader positioning
•Continue Data Analysis of Beam Data Continue Data Analysis of Beam Data
• New vertical Separator requested ( MEG, µLAN, µSR) New vertical Separator requested ( MEG, µLAN, µSR) vertical WIEN Filter MANDATORY for MEGvertical WIEN Filter MANDATORY for MEG
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Summary/ConclusionsSummary/Conclusions
Satisfactory Beam Line Solution has been achieved for MEGSatisfactory Beam Line Solution has been achieved for MEGwith a complete test of components up to COBRA injectionwith a complete test of components up to COBRA injection
•Separator Separator Transmission of (71Transmission of (71±5)%±5)% achieved achieved
•Rate of Rate of 8.58.5·10·107 7 µµ++/s at 1.8mA with 4cm Target/s at 1.8mA with 4cm Target at I/P Solenoid at I/P Solenoid (1.5(1.5·10·1088 µ µ++/s at 1.8mA 6cm Tg Proposal)/s at 1.8mA 6cm Tg Proposal)
•µ/e Separation of µ/e Separation of 11.8cm11.8cm at Collimator at Collimator 7.27.2σσ achieved achieved
•Using a small Bore Solenoid a Using a small Bore Solenoid a Transmission of 71%Transmission of 71% obtainedobtained rate rate 6.16.1·10·1077 µ µ++/s at 1.8mA with 4cm Target/s at 1.8mA with 4cm Target (1.1·10(1.1·108 8 µµ++/s at 1.8mA 6cm Tg PROPOSAL!!!)/s at 1.8mA 6cm Tg PROPOSAL!!!)
• Spot-size post Solenoid of Spot-size post Solenoid of σσXX=5.3mm=5.3mm, , σσYY=6.5mm=6.5mm achieved achieved equivalent to spot-size in Proposal at Targetequivalent to spot-size in Proposal at Target
• 88%88% of ALL of ALL µµ++ STOPPEDSTOPPED in in Thin Target of PROPOSALThin Target of PROPOSAL• Lots more work still needed e.g. BTS, Target SystemLots more work still needed e.g. BTS, Target System
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Time Schedule Beam lineTime Schedule Beam line
2002 2003 2004 2005
2003:2003:
Test
Milestone
AssemblyDesign Manufacture
Studies
Solenoid BTS
Triplet 1
Target
MilestoneMilestoneChoice “U”/”Z” Choice “U”/”Z” ++ MethodMethod
JanuaryJanuary FebruaryFebruary MarchMarch AprilApril MayMay JuneJuneShutdownShutdown
PMC + Laser Hut PMC + Laser Hut + Sindrum 2 + Sindrum 2 removalremoval
Insertion Triplet 1Insertion Triplet 1 COBRA installationCOBRA installation BTSBTS
Beam LineBeam LineCommission-Commission-ing startsing starts
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E5 Area LayoutE5 Area Layout
Following Slides from Stefan RittFollowing Slides from Stefan Ritt
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• Permanent installation of MEG experiment• Concurrently run other experiments• No need of rail system if
– Beam line elements are removed– Concrete wall in front of MEG detector
• COBRA + most electronics on platform• LXe storage tanks on separate platform• Calorimeter on small rail system• 500 kg crane on top of platform• “curtain” and A/C around platform
• Permanent installation of MEG experiment• Concurrently run other experiments• No need of rail system if
– Beam line elements are removed– Concrete wall in front of MEG detector
• COBRA + most electronics on platform• LXe storage tanks on separate platform• Calorimeter on small rail system• 500 kg crane on top of platform• “curtain” and A/C around platform
Ideas for Ideas for E5 areaE5 area
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Area LayoutArea Layout
optional wall
small rail
electronics
LXestorage compressor
LN2 line
Trigger & DAQ
HV
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Platform DesignPlatform Design
150100
COBRA
RACKS
floor cover(removable)
“double floor”
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COBRA
LXeCalorimeter
curtain(transparent plastic)
removablecover (wood)
crane
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ElectronicsElectronics
HV HV
splitter
DRS
splitter
DRS signal
HVfiber
HV: Splitter: DRS:
800 Lxe 800 Lxe 1920 DC160 Timing Cnt 160 Timing Cnt 800 Lxe
40 Chamber 160 Timin Cnt
1000 channels 960 channels 2880 channels100 modules 30 modules 180 modules5.6 crates 2.5 crates 9 crates1.4 racks 0.6 racks 2.3 racks
sum: 4.3 racks
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