RF Module Integration Colin Whyte University of Strathclyde on behalf of the MICE collaboration 1RF Review 9th & 10th Sept '15 Abingdon.

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Presentation transcript:

RF Module Integration Colin Whyte University of Strathclyde on behalf of the MICE collaboration 1RF Review 9th & 10th Sept '15 Abingdon

2 Outline Interfaces High power RF co-axial lines Vacuum Window protection Vacuum volume dimensions and pumping Temperature - control Cavity tuning – air Connections to magnets Bellows Flange bolt pattern Quench force Sliding platforms Clean room End flanges Controls and Monitoring Interlocks RF Power amplifiers Vacuum Temperature – independent Cavity tuning – LabView LLRF – offline test Muon Timing Safety Ionising radiation High voltage for RF amplifiers

Demonstration of Ionisation Cooling 3RF Review 9th & 10th Sept '15 Abingdon RF power transmission overhead SF6 filled co-ax lines Relatively easily de- mountable

Flexible coax Line Trimmers Hybrid Splitter Directional Coupler in each line 4616 Pre Amplifier TH116 Amplifier 500kW Load Directional Coupler 6 inch RF Power 4RF Review 9th & 10th Sept '15 Abingdon Simplified distribution network- overhead Off-centre mounting of hybrid takes up phase shift Minimised length of 4” line- minimises losses

Co-axial line support 5RF Review 9th & 10th Sept '15 Abingdon Coax support structure Drill and tap PRY for 2 off vertical upright supports Steve Plate & Holger don’t see this as a problem Fasten Coax support frame to uprights

Offline support frame 6RF Review 9th & 10th Sept '15 Abingdon

7 NEW RF SUPPORT PILLAR POSITIONS RF MODULE Co-Axial line trimmer supports SUPPORT PILLAR POSITIONS TAKEN FROM DRG NO TD DOWNSTREAM AFC UPSTREAM AFC

RF module vacuum 8RF Review 9th & 10th Sept '15 Abingdon Large, complicated vacuum volume – 2 large turbo-pumps mounted to central spool, located behind south side of PRY with large bore pump path Note T Anderson talk on Be window protection.

Cavity temperature 9RF Review 9th & 10th Sept '15 Abingdon Cavity on frequency at 36.5 degrees Water flow rates on cavity restricted due to small cooling pipes 0.05 degrees cavity temperature stability can be achieved RF trips result in cavity detuning which can again take 5 minutes to recover from RF is always applied at effectively maximum Temperature stabilisation system with heater, cold water and mixing valve control by high resolution process controller that self learns

MTA Cavity results 10 B=0 0.5M+ pulses at >11MV/m 14MV/m for short periods. No evidence of breakdown B=5T >7.5M pulses 8MV/m MV/m MV/m MV/m No breakdown below ~14MV/m RF Review 9th & 10th Sept '15 Abingdon

Cavity Tuning 11RF Review 9th & 10th Sept '15 Abingdon 0.5M pulses 5Hz, B=5T, 1.6MW (10.3MV/m) 1.4kW ave, 1Hz update interval

Vacuum connections 12RF Review 9th & 10th Sept '15 Abingdon mm OD x mm ID nested bellows : Extended length 66mm Closed length 14mm Stroke 52mm nom free length 40mm Axial stiffness 200N/mm. 316L, 0.91mm thk. End terminals: 316.

Quench Forces 13RF Review 9th & 10th Sept '15 Abingdon

14RF Review 9th & 10th Sept '15 Abingdon RF CAVITY MODULE MOVING PLATFORM (TOP VIEW) EXISTING AFC MOVING PLATFORM ARRANGEMENT RF MODULE C of G LINE RF MODULE FRAME FOOTPRINT EXISTING SS TIE-DOWN ARRANGMENT (DOWNSTREAM) PLATFORM TRANSIT ROLLERS SPACED AT MAX. SPAN IN AVAILABLE ENVELOPE BETWEEN FLOOR BEAMS HOWEVER MODULE LOAD OFFSET OFFSET CTR

RF Review 9th & 10th Sept '15 Abingdon RF CAVITY MODULE MOVING PLATFORM ARRANGEMENT OPTIONS (TOP VIEW) EXISTING AFC MOVING PLATFORM ARRANGEMENT PROPOSED RF MODULE MOVING PLATFORM ARRANGEMENT EXISTING SS TIE-DOWN ARRANGMENT EXISTING AFC MOVING PLATFORM ARRANGEMENT PROPOSED RF MODULE MOVING PLATFORM ARRANGEMENT EXISTING SS TIE- DOWN ARRANGMENT 15 OPTION 1OPTION 2 DOWNSTREAM SPECTROMETER UPSTREAM SPECTROMETER

Cooling Demonstration 16RF Review 9th & 10th Sept '15 Abingdon

Partial Return Yoke (PRY) 17 Flux return path to protect sensitive equipment from fringe field of magnet chain. 100mm thick soft iron plate Step IV PRY re-used and extended for cooling demonstration. Extension also made in the USA, drawings complete, ready to go to contract. New, extended support structure made in UK. New floor fixings required RF Review 9th & 10th Sept '15 Abingdon

RF Module End Plates 18RF Review 9th & 10th Sept '15 Abingdon RF Module end plates are heavy, 3-400kg. Require hoist/frame in clean room. Cannot flow significant clean gas to preserve cleanliness because of fragile windows. Replace Vac flanges with thin/light ‘clean’ plates which allow insertion into beamline. Build structure around magnets and fit to clean room extension.

19RF Review 9th & 10th Sept '15 Abingdon RF system overall control State machine control RF measurements Important vacuum /voltage/ temperature parameters Interlock status and trips Illustration shows the main operator panel for ALICE more in-depth control pages are clickable from this main screen

Off-line Testing 20RF Review 9th & 10th Sept '15 Abingdon RF Module RF Amplifier Area

Cooling Demonstration Installation start 1 st June RF cavities, 2 secondary absorbers bracketing main absorber 21RF Review 9th & 10th Sept '15 Abingdon Extended Partial Return Yoke – USA 2 x 201MHz cavities - USA Be windows Tested in B field to 14MV/m 2 x 2MW 201MHz amplifier chains – UK RF infrastructure support - UK RF controls and monitoring – UK Muon phase determination - UK

i RF Review 9th & 10th Sept '15 Abingdon22