P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 11

MEG Beam Line StudiesMEG Beam Line Studies

E5 Z-BranchE5 Z-Branch NOW !!!NOW !!!

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 22

Topics to be AddressedTopics to be Addressed

• Summary of Status at the time of the last ReviewSummary of Status at the time of the last Review

• Current Component StatusCurrent Component Status

• Summary/ConclusionsSummary/Conclusions

• Beam Line ScheduleBeam Line Schedule

• Summary of Status at the time of the last ReviewSummary of Status at the time of the last Review

• Current Component StatusCurrent Component Status

• Summary/ConclusionsSummary/Conclusions

• Beam Line ScheduleBeam Line Schedule

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 33

Summary Status (Review July Summary Status (Review July 2003)2003)

• Beam Line Milestone just achievedBeam Line Milestone just achieved – – Successful test of optics up to point of injection into COBRA Solenoid Successful test of optics up to point of injection into COBRA Solenoid As well as beam propertiesAs well as beam properties (Phase Space, Stopping rate, Separation Quality, etc.)(Phase Space, Stopping rate, Separation Quality, etc.) matching the proposed valuesmatching the proposed values … … using temporary components !!!using temporary components !!!

Triplet I Separator II Triplet II PSC-SolenoidTriplet I Separator II Triplet II PSC-Solenoidin: Nov. 2002 Defect !!! most Last Run Temporary Temporaryin: Nov. 2002 Defect !!! most Last Run Temporary Temporaryout: Jun. 2003 out: Jun. 2003 out: Jun. 2003 out: Jun. 2003 out: Jun. 2003 out: Jun. 2003 out: Jun. 2003 out: Jun. 2003 -> LEM -> New -> Shorter -> Too Short Bore too small-> LEM -> New -> Shorter -> Too Short Bore too small

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 44

Summary Status (Review July 2003) – Summary Status (Review July 2003) – cont.cont.

• Beam Transport SolenoidBeam Transport Solenoid BTS - BTS - under studyunder study estimated earliest delivery …early summer 2004estimated earliest delivery …early summer 2004

• LNLN2 2 + LHe transfer Lines+ LHe transfer Lines under discussionunder discussion

• Remaining Beam ElementsRemaining Beam Elements - - under discussion under discussion

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 55

Current Component Status – Triplet I + Current Component Status – Triplet I + SeparatorSeparator

• Triplet I: Triplet I:

- - QSB Quadrupole magnetsQSB Quadrupole magnets being removed being removed during re-build of during re-build of µµE4 AreaE4 Area during during current Shutdown, will be assembled current Shutdown, will be assembled as tripletas triplet

- - WagonWagon for triplet being constructed fromfor triplet being constructed from lower-part of shielding wagonlower-part of shielding wagon

- - High Acceptance +-slit Vacuum ChamberHigh Acceptance +-slit Vacuum Chamber under designunder design

Insertion Shutdown 2004 (~April)Insertion Shutdown 2004 (~April)

• Triplet I: Triplet I:

- - QSB Quadrupole magnetsQSB Quadrupole magnets being removed being removed during re-build of during re-build of µµE4 AreaE4 Area during during current Shutdown, will be assembled current Shutdown, will be assembled as tripletas triplet

- - WagonWagon for triplet being constructed fromfor triplet being constructed from lower-part of shielding wagonlower-part of shielding wagon

- - High Acceptance +-slit Vacuum ChamberHigh Acceptance +-slit Vacuum Chamber under designunder design

Insertion Shutdown 2004 (~April)Insertion Shutdown 2004 (~April)

• Separator :Separator :- - New Vertical Separator New Vertical Separator was approved for MEG was approved for MEG design underway & HV-parts ordereddesign underway & HV-parts ordered

not expected before October 2004 !!!not expected before October 2004 !!!

• Separator :Separator :- - New Vertical Separator New Vertical Separator was approved for MEG was approved for MEG design underway & HV-parts ordereddesign underway & HV-parts ordered

not expected before October 2004 !!!not expected before October 2004 !!!

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 66

Current Component Status – Triplet II + Current Component Status – Triplet II + BTSBTS

• Triplet II:Triplet II: -- QSK Triplet + VacuumQSK Triplet + Vacuum Chamber removed from Chamber removed from µµE4 beam line E4 beam line

during current shutdownduring current shutdown Available after shutdown 2004 (April)Available after shutdown 2004 (April)

• Triplet II:Triplet II: -- QSK Triplet + VacuumQSK Triplet + Vacuum Chamber removed from Chamber removed from µµE4 beam line E4 beam line

during current shutdownduring current shutdown Available after shutdown 2004 (April)Available after shutdown 2004 (April)

• Beam Transport Solenoid BTS:Beam Transport Solenoid BTS: - New superconducting solenoid which - New superconducting solenoid which replaces PSC-test Sol. used in Beam Testsreplaces PSC-test Sol. used in Beam Tests

-- Delayed !!! – due toDelayed !!! – due to

(i)(i) COBRA coupling problems more COBRA coupling problems more complexcomplex than envisagedthan envisaged

(ii) non-negligible amount of time (ii) non-negligible amount of time invested in beam & detector setupinvested in beam & detector setup simulation for LXe Large Prototype simulation for LXe Large Prototype test in test in 1 Oct.1 Oct. end Dec.2003 end Dec.2003

• Beam Transport Solenoid BTS:Beam Transport Solenoid BTS: - New superconducting solenoid which - New superconducting solenoid which replaces PSC-test Sol. used in Beam Testsreplaces PSC-test Sol. used in Beam Tests

-- Delayed !!! – due toDelayed !!! – due to

(i)(i) COBRA coupling problems more COBRA coupling problems more complexcomplex than envisagedthan envisaged

(ii) non-negligible amount of time (ii) non-negligible amount of time invested in beam & detector setupinvested in beam & detector setup simulation for LXe Large Prototype simulation for LXe Large Prototype test in test in 1 Oct.1 Oct. end Dec.2003 end Dec.2003

BTSBTSCOBRACOBRA

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 77

Current Component Status – BTS Current Component Status – BTS cont.cont.

BTS – Complications:BTS – Complications:(i)(i) focusing optics at Collimator found focusing optics at Collimator found to be to be v. sensitivev. sensitive to to STRAY FIELDSTRAY FIELD solenoid excitation curvesolenoid excitation curve DESTROYED DESTROYED if Bfieldif Bfield TOO LARGE TOO LARGE

50% of Stray Field from COBRA 50% of Stray Field from COBRA 5m away !!!5m away !!! Compensation Coil Needed Compensation Coil Needed

upstream of BTSupstream of BTS under Design…under Design…

BTS – Complications:BTS – Complications:(i)(i) focusing optics at Collimator found focusing optics at Collimator found to be to be v. sensitivev. sensitive to to STRAY FIELDSTRAY FIELD solenoid excitation curvesolenoid excitation curve DESTROYED DESTROYED if Bfieldif Bfield TOO LARGE TOO LARGE

50% of Stray Field from COBRA 50% of Stray Field from COBRA 5m away !!!5m away !!! Compensation Coil Needed Compensation Coil Needed

upstream of BTSupstream of BTS under Design…under Design…

Triplet 2Triplet 2Triplet 2Triplet 2

1111

SolenoidSolenoidSolenoidSolenoidWIENWIENWIENWIEN

FilterFilterFilterFilter

ColliColli..ColliColli..TripTrip..TripTrip..

µµ++µµ++

ee++ee++ee++ee++µµ++µµ++

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 88

Current Component Status – BTS cont.Current Component Status – BTS cont.

Modified COBRA Axial Bfield

0.00

0.10

0.20

0.30

0.40

0.50

0.60

125 145 165 185 205 225 245 265 285

Axial Distance from COBRA centre {cm}

Axi

al B

fiel

d

{T}

COBRA Bfield

COBRA(+)Tran SOL(+)

Trans. Sol.

COBRA(+)Tran Sol(-)

BTS – Complications:BTS – Complications:

(ii) (ii) Requirements:Requirements: - BTS Bfield must have min. influence - BTS Bfield must have min. influence on COBRA field in fiducial regionon COBRA field in fiducial region- Min. beam-spot size at TargetMin. beam-spot size at Target contradictory!!!contradictory!!! Only free parameters (coupled):Only free parameters (coupled): BBBTSBTS & & ΔΔLLCOBRA-BTSCOBRA-BTS

Focus also dependent on how split Focus also dependent on how split degrader (M.S. vs. Background)degrader (M.S. vs. Background)

Full Simulation underway:Full Simulation underway: TRANSPORT, TURTLE, Track TRANSPORT, TURTLE, Track Optics Optics GEANT GEANT spot-size, resolution spot-size, resolution ANSYS ANSYS Magnetic influenceMagnetic influence

Delivery BTS not before ~Nov. 2004Delivery BTS not before ~Nov. 2004

BTS – Complications:BTS – Complications:

(ii) (ii) Requirements:Requirements: - BTS Bfield must have min. influence - BTS Bfield must have min. influence on COBRA field in fiducial regionon COBRA field in fiducial region- Min. beam-spot size at TargetMin. beam-spot size at Target contradictory!!!contradictory!!! Only free parameters (coupled):Only free parameters (coupled): BBBTSBTS & & ΔΔLLCOBRA-BTSCOBRA-BTS

Focus also dependent on how split Focus also dependent on how split degrader (M.S. vs. Background)degrader (M.S. vs. Background)

Full Simulation underway:Full Simulation underway: TRANSPORT, TURTLE, Track TRANSPORT, TURTLE, Track Optics Optics GEANT GEANT spot-size, resolution spot-size, resolution ANSYS ANSYS Magnetic influenceMagnetic influence

Delivery BTS not before ~Nov. 2004Delivery BTS not before ~Nov. 2004

BTSI

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

BTSH

3.418

COBR

5.071

COBR

5.564

COBR

6.036

COBR

6.471

COBR

6.861

COBR

7.200

COBR

7.488

COBR

7.727

COBR

7.923

COBR

8.082

COBR

8.212

COBR

8.322

COBR

8.423

COBR

8.531

COBR

8.661

COBR

8.831

COBR

9.059

COBR

9.360

COBR

9.739

COBR

10.193

COBR

10.708

COBR

11.254

COBR

11.785

COBR

12.392

COBR

12.548

COBR

12.657

COBR

12.630

COBR

12.392

COBR

11.785

COBR

11.254

COBR

10.708

COBR

10.193

COBR

9.739

COBR

9.360

COBR

9.059

COBR

8.831

COBR

8.661

COBR

8.531

COBR

8.423

COBR

8.322

COBR

8.212

COBR

8.082

COBR

7.923

COBR

7.727

COBR

7.488

COBR

7.200

COBR

6.861

COBR

6.471

COBR

6.036

COBR

5.564

COBR

5.071

DL1

DL2

CENT

BTSBTS COBRACOBRA

Deg1Deg1 Deg2Deg2

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 99

Current Component Status – Cryo. Lines + Current Component Status – Cryo. Lines + TargetsTargets

• LNLN2 2 & LHe& LHe Transfer Lines:Transfer Lines:

In planning phaseIn planning phase

• Targets:Targets: simulation work concerning size underway in conjunctionsimulation work concerning size underway in conjunction

with BTS studies, after which mechanics & He-Bag questionwith BTS studies, after which mechanics & He-Bag question

will be tackledwill be tackled

• LNLN2 2 & LHe& LHe Transfer Lines:Transfer Lines:

In planning phaseIn planning phase

• Targets:Targets: simulation work concerning size underway in conjunctionsimulation work concerning size underway in conjunction

with BTS studies, after which mechanics & He-Bag questionwith BTS studies, after which mechanics & He-Bag question

will be tackledwill be tackled

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 1010

Summary/ConclusionsSummary/Conclusions

• Shutdown 2004 Shutdown 2004 until mid Apriluntil mid April

• Initially only Triplet I used for Timing-counter beam time whileInitially only Triplet I used for Timing-counter beam time while

COBRA installation runs in parallel (behind Concrete wall)COBRA installation runs in parallel (behind Concrete wall)

• Old Separator + new Triplet II used for commissioning up to Old Separator + new Triplet II used for commissioning up to

BTS injection BTS injection (June/July)(June/July)

• New Separator not until, at least New Separator not until, at least October October

• BTS not before BTS not before November November so that commissioning 2nd part of so that commissioning 2nd part of

beam line (beam line (Need ~6 weeks for thisNeed ~6 weeks for this) at end of year ) at end of year i.e. BTS musti.e. BTS must

arrive by beginning Nov. to use time effectively, otherwise Gottaarrive by beginning Nov. to use time effectively, otherwise Gotta

(PROBLEM GOTTA et al. 6 weeks BT end-of-year)(PROBLEM GOTTA et al. 6 weeks BT end-of-year)

• If beam line commissioned by end December If beam line commissioned by end December

Bfield Mapping COBRA during Shutdown 2004/5Bfield Mapping COBRA during Shutdown 2004/5

• Shutdown 2004 Shutdown 2004 until mid Apriluntil mid April

• Initially only Triplet I used for Timing-counter beam time whileInitially only Triplet I used for Timing-counter beam time while

COBRA installation runs in parallel (behind Concrete wall)COBRA installation runs in parallel (behind Concrete wall)

• Old Separator + new Triplet II used for commissioning up to Old Separator + new Triplet II used for commissioning up to

BTS injection BTS injection (June/July)(June/July)

• New Separator not until, at least New Separator not until, at least October October

• BTS not before BTS not before November November so that commissioning 2nd part of so that commissioning 2nd part of

beam line (beam line (Need ~6 weeks for thisNeed ~6 weeks for this) at end of year ) at end of year i.e. BTS musti.e. BTS must

arrive by beginning Nov. to use time effectively, otherwise Gottaarrive by beginning Nov. to use time effectively, otherwise Gotta

(PROBLEM GOTTA et al. 6 weeks BT end-of-year)(PROBLEM GOTTA et al. 6 weeks BT end-of-year)

• If beam line commissioned by end December If beam line commissioned by end December

Bfield Mapping COBRA during Shutdown 2004/5Bfield Mapping COBRA during Shutdown 2004/5

Delay in Full Commissioning of MEG beam Line now expected Delay in Full Commissioning of MEG beam Line now expected Though Should NOT Delay Experiment Start !!!Though Should NOT Delay Experiment Start !!!

P.-R. KettleP.-R. Kettle MEG-Review February 2004MEG-Review February 2004 1111

Provisional MEG Beam ScheduleProvisional MEG Beam Schedule

Gotta et al. ???Gotta et al. ???