Target Assembly and Installation Update

20th August 2009

Paul Hodgson

The University of Sheffield

Overview

• Assemble and test two complete target systems in time for installation during August 2009 shutdown

• Status of components

• Assembly plan and progress

• Commissioning plan

MICE Target Mechanical Design

• Jason Tarrant – STFC– Working on upgrade of Target Mechanics

• Many key components redesigned

• Particular emphasis on the shaft and bearings

• Tighter control of component alignment, tolerances and QA

• Key changes– Circular tube lower section– Shorter length with extra dip depth– Balanced vane assembly

5.95/4.55mmTi gr2 tube

Slot & fixingsfor read-out

vane

Doubleflat for

anti-rotation

4mmSolid Ti gr2 rod

Stop

Bearingsurfaces

Status of Upgraded Shaft

Coated Shafts• Two shafts back from TecVac with DLC coating• CoC from TecVac says we have 4 µm DLC coating• Metrology shows one shaft slightly misaligned• 200 µm out of true• The 200 µm measured from ends so real effect is less that half this• Decision to use perfect shaft in T1 and straighten other for use on T2

in R78

• Surfaces look OK overall• Talking to TecVac wrt slight mottling

on lower shaft• Upper shaft flat region shows one

good side and one with evidence of machining marks

• Not a problem but will ensure best side in contact with bearing follower Lower shaft region showing some

mottling

Upper shaft region (flat) showing tooling marks Other side of flat with less visible tooling marks

Status of Upgraded Bearings• Single piece main section• Improved alignment• Reduced tolerances/clearances• New anti-rotation design

• Two pairs of bearings coated and ready for assembly• Metrology and visual inspection seem fine

Bearing hole

Removable wedge

Rotation stop

Dowel & angle faces for location

DLC set-up: wedge removed = line of sight to

bearing surface

Upper bearing Lower bearing

Again some evidence of minor tooling marks on all bearings but the engineers are happy with finish

Status of Upgraded Core Assembly

• Simpler bolt together design• Independent stator assembly• Added active packing to top of stator• Main body assembly shorter by 41mm,

shaft tube section shorter by 31mm - gain 10mm dip depth

Stator = independent assembly

Bearing extension reducing length of unsupported target shaft

Compact core with solid bolt together interfaces

Status of Upgraded Vane

• Ruggedized & balanced• Individual slots with guard edge• Successfully tested with optical block

New balanced vane with guarded teeth and slot for reset

The Clean roomAll components laid out prior to assembly

First assembly of shaft and bearings in main body

The Plan

• Assemble 1st target system in clean room – 2 days• Simultaneously commission electronics in R78 – 2 days• Install T1 in R78 – 3 days• Simultaneously commission electronics in MLCR – 2

days• Test T1 in R78 for ~50k pulses then remove and install

in ISIS – 25/26th Aug• Simultaneously assemble then install T2 in R78 – 2 days• Longer test of T2 ~300k pulses – 4 days• Removal and close inspection of T2

Started on time

ISIS installation

T1 assembly underway but approx 1 day late

Key Elements

• Items from previous meeting

• Stator Main Body assembly in clean roomo Stator body with the new end plates welded. RAL Ready

o Optics block (calibrated) with laser safety covers. Sheffield Ready

o Coated bearings, upper and lower. RAL Ready

o Shaft, vane and magnets RAL Ready

• Final assembly in R78:o Power, Water, Fibre Optics Sheffield Ready

o Chiller - Second chiller RAL Ready

o Bellows RAL Ready

o DAQ PC Sheffield Ready

o Control PC Daresbury Ready

Key Elements

• Points from previous meeting• Power Electronics in R78 and VacRack area - DONE• Control software for power electronics needs upgrading

in R78 and MLCR – DONE• Spare fibres laid to Synchrotron - DONE• All connections to target assembly to be clearly labelled

and documented - DONE• Health and safety documentation - DONE• Appropriate people involved need to be aware of the

schedule and timescale - DONE

Commissioning Plan• There is a clear plan for commissioning in beam in

early September• Key target team people identified and available for

shiftsday status action remarkstart end tot time experts

POINT -2COMPLETION of Magnet SOAK TEST during AUGUST and BEFORE Sept 2nd MA+MOM+MC/MHthis is a pre-condition for future runs: see word document for details

1 POINT -12 a) GVA1 + TOF0 + BLM re-commissioning BEFORE taking data with target 8 h JSG (DAQ+GVA1), MB (TOF0), AD (BLM)3 b) dry run with TARGET 8 h TGT-Group (TGT)45 POINT 06 TARGET COMMISSIONING: complete run with GVA1+TOF0+BLM in action 12 h TGT-Group (TGT)7 2 shifts 12 h8 DEPTH & TIME scan (as in 2008). 1shift 8h9 TIME FIXED, scan in DEPTH ONLY: BLM Scan Run: 50,100,200,....,1000 V 8h AD (BLM/GVA1 beam loss studies)

10 (11 runs X 20min = 4hrs) to study BLM vs GVA1 vs tgt depth correlation. 11 LMON commissioning (if any). 1shift 8h PS (LMON)12 Beam Loss HIGH INTENSITY STUDY: try to reach maximum LOSS (25 V = 500x50 mV) 8h MoM, TGT-Group13 1 shift. RADIATION SURVEY TO FOLLOW. 1shift

mach

ine ph

ysics

Conclusion

• All components here and checked

• Assembly begun

• Some issues but no show stoppers

• Should be on track for installation 25-26th