P.-R Kettle MEG Review July Beam Transport & Target Systems BTS Success Novosibirsk 24/5/ : A 300 A

P.-R Kettle MEG Review July Beam Line & Target Status Topics to be Addressed: Beam Transport System (i) Degrader / BTS optimization (ii) Layout - fixed Beam Line Components Status * (i) Separator- undergoing HV-conditioning * (ii) Beam Transport Solenoid BTS – being commissioned  E5 (iii) Vacuum System (beam line + BTS)- being assembled (iii) Cryogenic Transfer Lines LN 2 LHe – installed He-Bag & Target Systems Schedule 2005 Summary + Critical Points Topics to be Addressed: Beam Transport System (i) Degrader / BTS optimization (ii) Layout - fixed Beam Line Components Status * (i) Separator- undergoing HV-conditioning * (ii) Beam Transport Solenoid BTS – being commissioned  E5 (iii) Vacuum System (beam line + BTS)- being assembled (iii) Cryogenic Transfer Lines LN 2 LHe – installed He-Bag & Target Systems Schedule 2005 Summary + Critical Points

P.-R Kettle MEG Review July Beam Transport System Status Status Beam Transport System Status Status

P.-R Kettle MEG Review July Beam Transport System As previously reported Beam Line Commissioning 2004 concluded with phase space measurements In vacuum up to the INJECTION into the BTS (without BTS !!!) (without BTS !!!) As previously reported Beam Line Commissioning 2004 concluded with phase space measurements In vacuum up to the INJECTION into the BTS (without BTS !!!) (without BTS !!!) Using real data  SIMULATE Phase Space & Back-Track to Triplet II  Forward-Track with Fringe Field of BTS + COBRA up to Target in COBRA  Forward-Track with Fringe Field of BTS + COBRA up to Target in COBRA using GEANT using GEANT Input Data to GEANT to study Degrader/Target + BTS/COBRA layout Input Data to GEANT to study Degrader/Target + BTS/COBRA layout “waist”

P.-R Kettle MEG Review July Degrader + BTS/COBRA Optimization Studied: 1. BTS/COBRA Distance vs. Degrader segmentation & Bfield (Cryo.-Cryo. Gap): minimum (200 mm), intermediate(300 mm), maximum(400 mm) (Cryo.-Cryo. Gap): minimum (200 mm), intermediate(300 mm), maximum(400 mm) 2. BTS/COBRA Polarity (+/+), (-/+) radial de-focussing/focussing Studied: 1. BTS/COBRA Distance vs. Degrader segmentation & Bfield (Cryo.-Cryo. Gap): minimum (200 mm), intermediate(300 mm), maximum(400 mm) (Cryo.-Cryo. Gap): minimum (200 mm), intermediate(300 mm), maximum(400 mm) 2. BTS/COBRA Polarity (+/+), (-/+) radial de-focussing/focussing Max. B+ve Max. B-ve Weak Gap dependence (4%) Weak Gap dependence (4%) strong polarity dependence strong polarity dependence (15%) (15%) Weak Gap dependence (4%) Weak Gap dependence (4%) strong polarity dependence strong polarity dependence (15%) (15%) strong degrader segmentation strong degrader segmentation dependence (25%) dependence (25%) strong degrader segmentation strong degrader segmentation dependence (25%) dependence (25%) Gap 400 mm Gap 400 mm -/+ Polarity -/+ Polarity Degrader BTS Degrader BTS Gap 

P.-R Kettle MEG Review July Beam Transport System Layout SepSep Trip I Trip II ASCASC BTSBTS COBRACOBRA XX YY Distances Fixed: Platform + COBRA surveyed into Zone surveyed into Zone Distances Fixed: Platform + COBRA surveyed into Zone surveyed into Zone

P.-R Kettle MEG Review July Beam Line Component Status Status Beam Line Component Status Status

P.-R Kettle MEG Review July Component Status: Separator BeamUpstreamSide 2371 mm Properties V max 200kV D plates 19cm L eff 70cm Properties V max 200kV D plates 19cm L eff 70cm MEG Vertical Separator MEG Vertical Separator Delayed by ~ 8 weeks: due to HV feed-through problems – now solved due to HV feed-through problems – now solved HV (+ve) supply changed to (–ve) one - technical HV (+ve) supply changed to (–ve) one - technical HV-electrode on top, want e + deflected down HV-electrode on top, want e + deflected down !!! HV Conditioning Tests in front of  E5 !!! expected ready for beam time expected ready for beam time MEG Vertical Separator MEG Vertical Separator Delayed by ~ 8 weeks: due to HV feed-through problems – now solved due to HV feed-through problems – now solved HV (+ve) supply changed to (–ve) one - technical HV (+ve) supply changed to (–ve) one - technical HV-electrode on top, want e + deflected down HV-electrode on top, want e + deflected down !!! HV Conditioning Tests in front of  E5 !!! expected ready for beam time expected ready for beam time April 2005 May 2005 June 2005

P.-R Kettle MEG Review July Component Status BTS Beam Transport Solenoid BTS Beam Transport Solenoid BTS Schedule delayed by ~ 7 weeks: 5 weeks delay during manufacture 5 weeks delay during manufacture 2 weeks transportation (papers stolen at Russian border) 2 weeks transportation (papers stolen at Russian border) nevertheless nevertheless !!! Novosibirsk Crew did a “Very Good Job” !!! !!! Novosibirsk Crew did a “Very Good Job” !!! BTS arrived PSI 8th July BTS arrived PSI 8th July Beam Transport Solenoid BTS Beam Transport Solenoid BTS Schedule delayed by ~ 7 weeks: 5 weeks delay during manufacture 5 weeks delay during manufacture 2 weeks transportation (papers stolen at Russian border) 2 weeks transportation (papers stolen at Russian border) nevertheless nevertheless !!! Novosibirsk Crew did a “Very Good Job” !!! !!! Novosibirsk Crew did a “Very Good Job” !!! BTS arrived PSI 8th July BTS arrived PSI 8th July Coil Manufacture - epoxying End March 2005 End May 2005 Performance Tests – Novosibirsk Novosibirsk Crew

P.-R Kettle MEG Review July BTS Performance Tests - Novosibirsk Performance Tests Performance Tests BINP Novosibirsk th May 2005 BINP Novosibirsk th May 2005Tested: maximum Design Current (300 A) maximum Design Current (300 A) Quench Detection / Protection Systems Quench Detection / Protection Systems (fast switch 30 ms  Shunt Resistor 90% power load) (fast switch 30 ms  Shunt Resistor 90% power load) Linearity Response (max. dev. ~ 0.4%) Linearity Response (max. dev. ~ 0.4%) LHe Consumption Rate (3.6 l/hr) LHe Consumption Rate (3.6 l/hr) Magnetic Field Measurements Magnetic Field Measurements Performance Tests Performance Tests BINP Novosibirsk th May 2005 BINP Novosibirsk th May 2005Tested: maximum Design Current (300 A) maximum Design Current (300 A) Quench Detection / Protection Systems Quench Detection / Protection Systems (fast switch 30 ms  Shunt Resistor 90% power load) (fast switch 30 ms  Shunt Resistor 90% power load) Linearity Response (max. dev. ~ 0.4%) Linearity Response (max. dev. ~ 0.4%) LHe Consumption Rate (3.6 l/hr) LHe Consumption Rate (3.6 l/hr) Magnetic Field Measurements Magnetic Field Measurements Flexible Cryogenic Design via: dedicated transfer lines (PSI) dedicated transfer lines (PSI) dewar operation (BINP) dewar operation (BINP) both (emergency) both (emergency) Flexible Cryogenic Design via: dedicated transfer lines (PSI) dedicated transfer lines (PSI) dewar operation (BINP) dewar operation (BINP) both (emergency) both (emergency) 0.7  Shunt Resistor All measurements & tests successful tests successful except except Bfield measurements which were influenced by by steel support structure All measurements & tests successful tests successful except except Bfield measurements which were influenced by by steel support structure

P.-R Kettle MEG Review July Results BTS Performance Tests - Novosibirsk Main Specifications L Cryo 2810 mm D Bore 380 mm D Coil / mm D Coil / mm L Coil 2630 mm B Max <0.55 T B Max <0.55 T I max 300 amps L Max 0.98 H E Stored 44 kJ Main Specifications L Cryo 2810 mm D Bore 380 mm D Coil / mm D Coil / mm L Coil 2630 mm B Max <0.55 T B Max <0.55 T I max 300 amps L Max 0.98 H E Stored 44 kJ Coils: double layer double layer cable dia mm cable dia mm 1865 / 1980 windings 1865 / 1980 windings 40% NiTi 40% NiTi RRR ~ 100 RRR ~ 100Coils: double layer double layer cable dia mm cable dia mm 1865 / 1980 windings 1865 / 1980 windings 40% NiTi 40% NiTi RRR ~ 100 RRR ~ 100 Linearity (B vs. I) better 0.4% up to 300 A B TOT deviates from expected due to Steel support structure !!! Needs to be re-measured at PSI !!! “Acceptance Tests” “Acceptance Tests” B TOT deviates from expected due to Steel support structure !!! Needs to be re-measured at PSI !!! “Acceptance Tests” “Acceptance Tests”

P.-R Kettle MEG Review July BTS Preparations PSI Preparations for BTS Installation in  E5 Preparations for BTS Installation in  E5 cryogenic lines for LHe & LN 2 ready for connection cryogenic lines for LHe & LN 2 ready for connection valve chamber ready for mounting on BTS valve chamber ready for mounting on BTS power supply tested & ready power supply tested & ready Preparations for BTS Installation in  E5 Preparations for BTS Installation in  E5 cryogenic lines for LHe & LN 2 ready for connection cryogenic lines for LHe & LN 2 ready for connection valve chamber ready for mounting on BTS valve chamber ready for mounting on BTS power supply tested & ready power supply tested & ready Valve Chamber Couples BTS to LHe transfer Line contains containsJoule-Thompson Valves for control Valve Chamber Couples BTS to LHe transfer Line contains containsJoule-Thompson Valves for control LHe Transfer Line Refrigerator unit Above  E5 LHe Transfer Line LHe line

P.-R Kettle MEG Review July BTS arrival PSI BTS arrival PSI BTS arrival PSI *** 8th July *** *** 8th July *** Acceptance Tests Acceptance Tests assembly / survey assembly / survey vacuum / leak tests  vacuum / leak tests  cryogenic installation  cryogenic installation  electrical installation electrical installation cool-down cool-down quench detection / quench detection / protection tests protection tests Bfield measurements Bfield measurements BTS arrival PSI BTS arrival PSI *** 8th July *** *** 8th July *** Acceptance Tests Acceptance Tests assembly / survey assembly / survey vacuum / leak tests  vacuum / leak tests  cryogenic installation  cryogenic installation  electrical installation electrical installation cool-down cool-down quench detection / quench detection / protection tests protection tests Bfield measurements Bfield measurements “ On route PSI” “ On route PSI” ~ 6500 km ~ 6500 km Novosibirsk - PSI “ On route  E5” “ On route  E5” 8th July th July 2005  E5  E5 14th July 2005  E5  E5 !!! Problems !!! !!! Problems !!! welding joint tower / cryostat welding joint tower / cryostat damaged in transport damaged in transport  Re-welded OK  Re-welded OK cryogenic connection valve- cryogenic connection valve- chamber / LHe transfer line chamber / LHe transfer line not compatible  To workshops  To workshops Use dewar system LHe Use dewar system LHe !!! Problems !!! !!! Problems !!! welding joint tower / cryostat welding joint tower / cryostat damaged in transport damaged in transport  Re-welded OK  Re-welded OK cryogenic connection valve- cryogenic connection valve- chamber / LHe transfer line chamber / LHe transfer line not compatible  To workshops  To workshops Use dewar system LHe Use dewar system LHe LN 2 Valve Valvechamber *** Dmitry Reports: 18th July 11:00 coil superconducting 20:00 *** 283A reached *** (nominal ~ 200A ) (nominal ~ 200A ) *** Dmitry Reports: 18th July 11:00 coil superconducting 20:00 *** 283A reached *** (nominal ~ 200A ) (nominal ~ 200A )

P.-R Kettle MEG Review July He-Bag & Target System Status Status He-Bag & Target System Status Status

P.-R Kettle MEG Review July He-Bag / Target System - General (I) Desired Beam Characteristics (I) Desired Beam Characteristics transport maximum number µ + to the target (vacuum / He, large ΔP) transport maximum number µ + to the target (vacuum / He, large ΔP) maximize µ + stopping-rate in the target (small ΔP, vacuum /He) maximize µ + stopping-rate in the target (small ΔP, vacuum /He) minimize beam spot size & multiple scattering (vacuum / He, degrader close to target) minimize beam spot size & multiple scattering (vacuum / He, degrader close to target) minimize background from decays or Bremsstrahlung (degrader far from away, vacuum / He) minimize background from decays or Bremsstrahlung (degrader far from away, vacuum / He) (II) Desired Target Requirements (II) Desired Target Requirements depolarizing target (isotropic e +, non-metal) depolarizing target (isotropic e +, non-metal) minimum target size (low-Z) minimum target size (low-Z) minimize material traversed by decay e + &  (slanted target) minimize material traversed by decay e + &  (slanted target) minimize generation of annihilation photons (large X 0, low-Z e.g. CH2) minimize generation of annihilation photons (large X 0, low-Z e.g. CH2) (I) Desired Beam Characteristics (I) Desired Beam Characteristics transport maximum number µ + to the target (vacuum / He, large ΔP) transport maximum number µ + to the target (vacuum / He, large ΔP) maximize µ + stopping-rate in the target (small ΔP, vacuum /He) maximize µ + stopping-rate in the target (small ΔP, vacuum /He) minimize beam spot size & multiple scattering (vacuum / He, degrader close to target) minimize beam spot size & multiple scattering (vacuum / He, degrader close to target) minimize background from decays or Bremsstrahlung (degrader far from away, vacuum / He) minimize background from decays or Bremsstrahlung (degrader far from away, vacuum / He) (II) Desired Target Requirements (II) Desired Target Requirements depolarizing target (isotropic e +, non-metal) depolarizing target (isotropic e +, non-metal) minimum target size (low-Z) minimum target size (low-Z) minimize material traversed by decay e + &  (slanted target) minimize material traversed by decay e + &  (slanted target) minimize generation of annihilation photons (large X 0, low-Z e.g. CH2) minimize generation of annihilation photons (large X 0, low-Z e.g. CH2)   Consequences: Consequences: vacuum window interface to COBRA vacuum window interface to COBRA He-atmosphere inside COBRA He-atmosphere inside COBRA slanted, non-metallic, low-Z, large X 0 target slanted, non-metallic, low-Z, large X 0 target Consequences: Consequences: vacuum window interface to COBRA vacuum window interface to COBRA He-atmosphere inside COBRA He-atmosphere inside COBRA slanted, non-metallic, low-Z, large X 0 target slanted, non-metallic, low-Z, large X 0 target  

P.-R Kettle MEG Review July COBRA-EnvironmentCOBRA-Environment (III) COBRA Environment Requirements (III) COBRA Environment Requirements thin vacuum window at entrance COBRA (190µ Mylar) thin vacuum window at entrance COBRA (190µ Mylar) safety measures against vacuum window rupture (safety seals !!!) safety measures against vacuum window rupture (safety seals !!!) must maintain DC & TC dimensions & insertion concepts must maintain DC & TC dimensions & insertion concepts stringent constant differential He-pressure between DCs & COBRA (~few µb) stringent constant differential He-pressure between DCs & COBRA (~few µb) no He-leakage to TC PMs (N 2 -Bag) no He-leakage to TC PMs (N 2 -Bag) frequent / less frequent access to Downstream side for calibration frequent / less frequent access to Downstream side for calibration & monitoring purposes ( e.g. Cockroft-Walton,  - CEX) & monitoring purposes ( e.g. Cockroft-Walton,  - CEX) possibility to exchange targets ( LiF, LH 2, CH 2 etc.) possibility to exchange targets ( LiF, LH 2, CH 2 etc.) (III) COBRA Environment Requirements (III) COBRA Environment Requirements thin vacuum window at entrance COBRA (190µ Mylar) thin vacuum window at entrance COBRA (190µ Mylar) safety measures against vacuum window rupture (safety seals !!!) safety measures against vacuum window rupture (safety seals !!!) must maintain DC & TC dimensions & insertion concepts must maintain DC & TC dimensions & insertion concepts stringent constant differential He-pressure between DCs & COBRA (~few µb) stringent constant differential He-pressure between DCs & COBRA (~few µb) no He-leakage to TC PMs (N 2 -Bag) no He-leakage to TC PMs (N 2 -Bag) frequent / less frequent access to Downstream side for calibration frequent / less frequent access to Downstream side for calibration & monitoring purposes ( e.g. Cockroft-Walton,  - CEX) & monitoring purposes ( e.g. Cockroft-Walton,  - CEX) possibility to exchange targets ( LiF, LH 2, CH 2 etc.) possibility to exchange targets ( LiF, LH 2, CH 2 etc.) COBRA Target System Target Insertion tube tube EndCapUSEndCapDSVacuumwindow Consequences Consequences 1.Thin beam line Vacuum Window 2.COBRA End-Cap Flanges + HE-seals (US,DS) 3.Target Insertion Tube & support system (separate He-environment) (TISS) system (separate He-environment) (TISS) 4.Target System (TS)  *** PSI staged Engineering Design Project *** PSI staged Engineering Design Project started – design & construction *** started – design & construction *** (i)US-flange, (ii) DS-flange, (iii) TISS, (iv) TS (i)US-flange, (ii) DS-flange, (iii) TISS, (iv) TS – design & Construction ready – Feb – design & Construction ready – Feb Consequences Consequences 1.Thin beam line Vacuum Window 2.COBRA End-Cap Flanges + HE-seals (US,DS) 3.Target Insertion Tube & support system (separate He-environment) (TISS) system (separate He-environment) (TISS) 4.Target System (TS)  *** PSI staged Engineering Design Project *** PSI staged Engineering Design Project started – design & construction *** started – design & construction *** (i)US-flange, (ii) DS-flange, (iii) TISS, (iv) TS (i)US-flange, (ii) DS-flange, (iii) TISS, (iv) TS – design & Construction ready – Feb – design & Construction ready – Feb. 2006

P.-R Kettle MEG Review July End-Cap Flanges & He-Bag seals COBRAcryostat US US End-Cap End-Cap Flange Flange N 2 -Bag Beam pipe pipe Engineering Design Concept Upstream End-Cap BeamCOBRA Design Design Allows open access to TCs + withdrawal withdrawal without affecting He-environment Mounting Mounting 1.N 2 -Bag 2.TC-rails 3.End-Cap + He-Bag He-Bag 4.TCs 5.Beam pipe with BTS with BTS 6.Couple He- Bag rings to Bag rings to vac. window vac. window Design Design Allows open access to TCs + withdrawal withdrawal without affecting He-environment Mounting Mounting 1.N 2 -Bag 2.TC-rails 3.End-Cap + He-Bag He-Bag 4.TCs 5.Beam pipe with BTS with BTS 6.Couple He- Bag rings to Bag rings to vac. window vac. window He-Bag He-Bagcomposition Sandwich Sandwich CH 2 /EVAL/CH 2 He-Bag He-Bagcomposition Sandwich Sandwich CH 2 /EVAL/CH 2 Insertion TCs TCsHe-BagRupture Seals Seals He-Baginnersealingrings

P.-R Kettle MEG Review July Target Optics - momentum Goal: maximize stop-density (min. target size) Question: optimum beam momentum? Answer: 28.2 MeV/c Goal: maximize stop-density (min. target size) Question: optimum beam momentum? Answer: 28.2 MeV/c Momentum-Spectrum: Momentum-Spectrum:Data: whole Beam Line optimized for each data point + 2-D Scan for each point !!! Theory:  -Kinematic Edge (29.79 MeV/c)  -Kinematic Edge (29.79 MeV/c) Theoretical func. P 3.5 folded with Gaussian ΔP/P + Const. Cloud µ + contribution  Fitted to data  2 /dof = 0.94 P cent = (28.16  0.02) MeV/c  P/P = (7.7  0.3) % FWHM P beam = (28.2  0.9) MeV/c  2 /dof = 0.94 P cent = (28.16  0.02) MeV/c  P/P = (7.7  0.3) % FWHM P beam = (28.2  0.9) MeV/c  + range vs. P  + range vs. P (fixed  P/P~ 7.7% FWHM) straggling ~11 % straggling ~11 % characteristic P 3.5 characteristic P 3.5  + range vs. P  + range vs. P (fixed  P/P~ 7.7% FWHM) straggling ~11 % straggling ~11 % characteristic P 3.5 characteristic P 3.5  + Stopping Rate vs. P  + Stopping Rate vs. P (fixed  P/P~ 7.7% FWHM fixed 400  CH 2 target) as p > relative stop rate relative stop rate < as p > beam rate > as p > beam rate > Optimal Stop Rate Optimal Stop Rate at P~28.2 MeV/c at P~28.2 MeV/c  + Stopping Rate vs. P  + Stopping Rate vs. P (fixed  P/P~ 7.7% FWHM fixed 400  CH 2 target) as p > relative stop rate relative stop rate < as p > beam rate > as p > beam rate > Optimal Stop Rate Optimal Stop Rate at P~28.2 MeV/c at P~28.2 MeV/c straggling ~ 11% P 3.5 Rel.  stops P 3.5 Norm.  -stops Norm.

P.-R Kettle MEG Review July Target Optics - degrader Many solutions studied – 2 main categories Single Node SNM SNM Double Node DNM DNM BTS DMNDMN  Beam envelope (cm)  Beam divergence (mrad ) Momentum Profile (MeV/c) BTS COBRA (1) DNM – Solution (190  Mylar Window) (190  Mylar Window) BTS / COBRA unlike BTS / COBRA unlike polarities polarities B BTS = kG B BTS = kG degrader 480  CH 2 at degrader 480  CH 2 at centre BTS centre BTS beam  ~ 12.5 mm beam  ~ 12.5 mm (1) DNM – Solution (190  Mylar Window) (190  Mylar Window) BTS / COBRA unlike BTS / COBRA unlike polarities polarities B BTS = kG B BTS = kG degrader 480  CH 2 at degrader 480  CH 2 at centre BTS centre BTS beam  ~ 12.5 mm beam  ~ 12.5 mm  P ~ 4.2 MeV/c  P ~ 2 MeV/c  P ~ 4.5 MeV/c Transmission Efficiency (%) Efficiency (%)Transmission T BTS ~ 98% T BTS+COBRA ~ 88% 3% decays 9% straggling TransmissionEfficiency T BTS+Deg = 98% T BTS+Deg = 98% T BTS+deg+COBRA = 88% T BTS+deg+COBRA = 88% T Sep+TII+Clli = 86.5% T Sep+TII+Clli = 86.5% Expected Stopping Rate R  = 9.6·10 7  + /s at 1.8mA 4cm Tg at 1.8mA 4cm Tg (1.7·10 8  + /s at 1.8mA 6cm Tg) BTS COBRA

P.-R Kettle MEG Review July Target Optics – degrader cont. (2) SNM Solutions ( no degrader in BTS) (2) SNM Solutions ( no degrader in BTS) (125  Mylar Window) (125  Mylar Window) either combine Degrader + Target (asymmetric stop distribution) either combine Degrader + Target (asymmetric stop distribution) or move degrader slightly upstream of target (e.g. use as end-wall of target insertion tube) or move degrader slightly upstream of target (e.g. use as end-wall of target insertion tube) (2) SNM Solutions ( no degrader in BTS) (2) SNM Solutions ( no degrader in BTS) (125  Mylar Window) (125  Mylar Window) either combine Degrader + Target (asymmetric stop distribution) either combine Degrader + Target (asymmetric stop distribution) or move degrader slightly upstream of target (e.g. use as end-wall of target insertion tube) or move degrader slightly upstream of target (e.g. use as end-wall of target insertion tube)targettarget e+e+e+e+ beam degraderdegrader  e+e+e+e+ targettarget beam SNM SNM DNM DNM unlikepolarityunlikepolarity like polarity like polarity COBRA Spot size vs B BTS Combined Tg + Deg upstream Deg. 15 cm Conclusions SNM (no BTS degrader) Conclusions SNM (no BTS degrader) Combined Sol n : gives  ~ 10 mm for 125  Mylar Window Combined Sol n : gives  ~ 10 mm for 125  Mylar Window with 190  Mylar  ~ 11.5 mm with 190  Mylar  ~ 11.5 mm no straggling loss only 3% decay loss no straggling loss only 3% decay loss Expected Rate R  ~ 1.06·10 8  + /s at 1.8mA 4 cm Tg. Expected Rate R  ~ 1.06·10 8  + /s at 1.8mA 4 cm Tg. BUT annihilation radiation potential worse - needs to be simulated BUT annihilation radiation potential worse - needs to be simulated Upstream Sol n : gives similar results to DNM  ~ 12.5 mm Upstream Sol n : gives similar results to DNM  ~ 12.5 mm annihilation radiation potential worse - needs to be simulated annihilation radiation potential worse - needs to be simulated Conclusions SNM (no BTS degrader) Conclusions SNM (no BTS degrader) Combined Sol n : gives  ~ 10 mm for 125  Mylar Window Combined Sol n : gives  ~ 10 mm for 125  Mylar Window with 190  Mylar  ~ 11.5 mm with 190  Mylar  ~ 11.5 mm no straggling loss only 3% decay loss no straggling loss only 3% decay loss Expected Rate R  ~ 1.06·10 8  + /s at 1.8mA 4 cm Tg. Expected Rate R  ~ 1.06·10 8  + /s at 1.8mA 4 cm Tg. BUT annihilation radiation potential worse - needs to be simulated BUT annihilation radiation potential worse - needs to be simulated Upstream Sol n : gives similar results to DNM  ~ 12.5 mm Upstream Sol n : gives similar results to DNM  ~ 12.5 mm annihilation radiation potential worse - needs to be simulated annihilation radiation potential worse - needs to be simulated

P.-R Kettle MEG Review July Target & Insertion Tube Target Geometry ( for beam  = 10mm) L PROJ = mm,  = 21.8 °, a = 60.3 mm, L TRUE = mm material: CH 2 + Rohacell / Mylar Slanted Target must be thicker – multiple scattering loss on downstream-side !!! Target Simulation underway: check of optimum angle  check of optimum angle  dependence on target thickness (multiple scattering, dependence on target thickness (multiple scattering, background, acceptance, timing, resolution) background, acceptance, timing, resolution) material considerations material considerations decay particle hit distributions on end-cap materials & decay particle hit distributions on end-cap materials & associated background acceptance associated background acceptance Target Geometry ( for beam  = 10mm) L PROJ = mm,  = 21.8 °, a = 60.3 mm, L TRUE = mm material: CH 2 + Rohacell / Mylar Slanted Target must be thicker – multiple scattering loss on downstream-side !!! Target Simulation underway: check of optimum angle  check of optimum angle  dependence on target thickness (multiple scattering, dependence on target thickness (multiple scattering, background, acceptance, timing, resolution) background, acceptance, timing, resolution) material considerations material considerations decay particle hit distributions on end-cap materials & decay particle hit distributions on end-cap materials & associated background acceptance associated background acceptance L PROJ L TRUE

P.-R Kettle MEG Review July Target & Insertion Tube + survey Target Insertion Tube & Support System (TISS) Material: Rohacell (PMI) closed cell foam, maybe + EVAL foil? Rohacell (PMI) closed cell foam, maybe + EVAL foil? wall thickness probably 2 mm Rohacell 31 wall thickness probably 2 mm Rohacell 31 length ~ 1500 mm length ~ 1500 mm dia. ~150 mm dia. ~150 mm  Weight ~ 51 g  Weight ~ 51 g simulations concerning background from simulations concerning background from e + interactions in TISS underway e + interactions in TISS underway Target Insertion Tube & Support System (TISS) Material: Rohacell (PMI) closed cell foam, maybe + EVAL foil? Rohacell (PMI) closed cell foam, maybe + EVAL foil? wall thickness probably 2 mm Rohacell 31 wall thickness probably 2 mm Rohacell 31 length ~ 1500 mm length ~ 1500 mm dia. ~150 mm dia. ~150 mm  Weight ~ 51 g  Weight ~ 51 g simulations concerning background from simulations concerning background from e + interactions in TISS underway e + interactions in TISS underway Target Insertion Tube Flange lateral + verticalmove-ment Survey aspects: target plane determined outside wrt. survey markers target plane determined outside wrt. survey markers on rohacell support rings (laser tracker) on rohacell support rings (laser tracker) possible temporary thin cross-wires on support rings possible temporary thin cross-wires on support rings for axial + radial alignment (break afterwards) for axial + radial alignment (break afterwards) radial adjustment made with TISS end-flange radial adjustment made with TISS end-flange axial position set by TISS (self-positioning) axial position set by TISS (self-positioning) Survey aspects: target plane determined outside wrt. survey markers target plane determined outside wrt. survey markers on rohacell support rings (laser tracker) on rohacell support rings (laser tracker) possible temporary thin cross-wires on support rings possible temporary thin cross-wires on support rings for axial + radial alignment (break afterwards) for axial + radial alignment (break afterwards) radial adjustment made with TISS end-flange radial adjustment made with TISS end-flange axial position set by TISS (self-positioning) axial position set by TISS (self-positioning)  -target system

P.-R Kettle MEG Review July Schedule 2005 Changes 2005: (compared to previous schedule) Changes 2005: (compared to previous schedule) Separator schedule + 8 weeks Separator schedule + 8 weeks BTS Schedule + 7 weeks BTS Schedule + 7 weeks COBRA end-cap + target design + manufacture extended COBRA end-cap + target design + manufacture extended Changes 2005: (compared to previous schedule) Changes 2005: (compared to previous schedule) Separator schedule + 8 weeks Separator schedule + 8 weeks BTS Schedule + 7 weeks BTS Schedule + 7 weeks COBRA end-cap + target design + manufacture extended COBRA end-cap + target design + manufacture extended Critical Path Critical Path Commissioning Part 1 too short for BTS/COBRA Commissioning Part 1 too short for BTS/COBRA phase space measurements  Dec. Part 2 final Target measurements  first beam 2006 final Target measurements  first beam 2006 Critical Path Critical Path Commissioning Part 1 too short for BTS/COBRA Commissioning Part 1 too short for BTS/COBRA phase space measurements  Dec. Part 2 final Target measurements  first beam 2006 final Target measurements  first beam 2006

P.-R Kettle MEG Review July Summary + Critical Path Summary: beam transport system up to COBRA defined beam transport system up to COBRA defined COBRA + Platform surveyed into position COBRA + Platform surveyed into position All beam transport elements now manufactured All beam transport elements now manufactured MEG Separator being conditioned MEG Separator being conditioned BTS successfully tested in Novosibirsk & delivered PSI (8th July) BTS successfully tested in Novosibirsk & delivered PSI (8th July) BTS reached current of 283A during commissioning at PSI (18th July) BTS reached current of 283A during commissioning at PSI (18th July) All cryogenic lines installed to zone All cryogenic lines installed to zone all vacuum system available all vacuum system available engineering project for COBRA end-caps + target Insertion & support system underway engineering project for COBRA end-caps + target Insertion & support system underway manufacture to be completed Feb manufacture to be completed Feb. 2006Summary: beam transport system up to COBRA defined beam transport system up to COBRA defined COBRA + Platform surveyed into position COBRA + Platform surveyed into position All beam transport elements now manufactured All beam transport elements now manufactured MEG Separator being conditioned MEG Separator being conditioned BTS successfully tested in Novosibirsk & delivered PSI (8th July) BTS successfully tested in Novosibirsk & delivered PSI (8th July) BTS reached current of 283A during commissioning at PSI (18th July) BTS reached current of 283A during commissioning at PSI (18th July) All cryogenic lines installed to zone All cryogenic lines installed to zone all vacuum system available all vacuum system available engineering project for COBRA end-caps + target Insertion & support system underway engineering project for COBRA end-caps + target Insertion & support system underway manufacture to be completed Feb manufacture to be completed Feb Critical Points: COBRA phase space measurement delayed until Dec (delays Separator + BTS) COBRA phase space measurement delayed until Dec (delays Separator + BTS) Final measurements with target delayed until first beam 2006 Final measurements with target delayed until first beam 2006 Critical Points: COBRA phase space measurement delayed until Dec (delays Separator + BTS) COBRA phase space measurement delayed until Dec (delays Separator + BTS) Final measurements with target delayed until first beam 2006 Final measurements with target delayed until first beam 2006

P.-R Kettle MEG Review July  -Beam Results (re-cap) First  - Beam Studies with MEG Beam: for calibration purposes in the experiment  - p→  0 n,  - p →  n 55 → 83 MeV  s and 129 MeV  s Data taken from: P-spectrum measurements MeV/c P-spectrum measurements MeV/c  s detected above 30 MeV/c (pulse-ht. + RF tof)  s detected above 30 MeV/c (pulse-ht. + RF tof) dedicated  - runs at 56 MeV/c & 103 MeV/c dedicated  - runs at 56 MeV/c & 103 MeV/c 56 MeV/c interesting since max. momentum 56 MeV/c interesting since max. momentum that can be transported to COBRA with that can be transported to COBRA with good optics SNM in BTS good optics SNM in BTS dedicated CEX run at 112 MeV/c dedicated CEX run at 112 MeV/c First  - Beam Studies with MEG Beam: for calibration purposes in the experiment  - p→  0 n,  - p →  n 55 → 83 MeV  s and 129 MeV  s Data taken from: P-spectrum measurements MeV/c P-spectrum measurements MeV/c  s detected above 30 MeV/c (pulse-ht. + RF tof)  s detected above 30 MeV/c (pulse-ht. + RF tof) dedicated  - runs at 56 MeV/c & 103 MeV/c dedicated  - runs at 56 MeV/c & 103 MeV/c 56 MeV/c interesting since max. momentum 56 MeV/c interesting since max. momentum that can be transported to COBRA with that can be transported to COBRA with good optics SNM in BTS good optics SNM in BTS dedicated CEX run at 112 MeV/c dedicated CEX run at 112 MeV/c Provisional Results Provisional Results  - Integral Spot Rates MHz  - Integral Spot Rates MHz for 1,8mA Proton Current & 4cm Target E Normalized to Momentum Slit Settings: FS41L/R 250/280 FS43L/R 240/220 FS41L/R 250/280 FS43L/R 240/ MeV/c R  = 7.6 ·10 6  - /s slits open R  = 7.2 ·10 5  - /s slits70/70 R  = 7.2 ·10 5  - /s slits70/70 56 MeV/c R  = 7.6 ·10 6  - /s slits open R  = 7.2 ·10 5  - /s slits70/70 R  = 7.2 ·10 5  - /s slits70/70 e-e-e-e- μ-μ-μ-μ- ----