p.-r. kettlemeg review july 20031 meg beam line studies

P.-R. KettleP.-R. Kettle MEG Review July 2003MEG Review July 2003 11

MEG Beam Line StudiesMEG Beam Line Studies


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


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


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


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


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”


Phase B Separation QualityPhase B Separation QualityTriplet 2Triplet 2

11


FilterFilter


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



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)%


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


FilterFilter


ee++ee++µµ++

Integrated RateIntegrated RateAfter SolenoidAfter Solenoid



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



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%


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.


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


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


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


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


E5 Area LayoutE5 Area Layout

Following Slides from Stefan RittFollowing Slides from Stefan Ritt


• 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


Area LayoutArea Layout

optional wall

small rail

electronics

LXestorage compressor

LN2 line

Trigger & DAQ

HV


Platform DesignPlatform Design

150100

COBRA

RACKS

floor cover(removable)

“double floor”


COBRA

LXeCalorimeter

curtain(transparent plastic)

removablecover (wood)

crane


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


Current design status (June 24th)

p.-r. kettlemeg review july 20031 meg beam line studies

Documents

zbranch beam time aprilmay

phase c of z

review beam time aprilmay

weeks of beam time

beam test

branch measurements

week phase b

meg beam line studies