diamond rf status morten jensen esls rf2004. latest constructional status photo. by angelos gonias,...
TRANSCRIPT
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Diamond RF Status
Morten Jensen
ESLS RF2004
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Latest constructional Status
Photo. by Angelos Gonias, DLS, Aug. 30th 2004
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Contractual completion Dec. 12th
Buildings Status: Office Block
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Concrete works and painting complete,
A/c ductwork and survey monuments in place
DLS has taken over control of these areas.
Linac tunnel Booster tunnel
Buildings Status: Synchrotron
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Concrete work complete (apart from access zone to inner area)
Painting of walls, floors and soffits in progress
A/c ductwork and survey monuments being installed
Storage ring tunnel
Buildings Status: Synchrotron
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Concrete slab complete (apart from access zone to inner area)
3 cranes installed and operational
Experimental Hall
Buildings Status: Synchrotron
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General RF PlantCryogenics
RF amplifiers
Rack mounted equipment
Platform
Waveguide
Cavity location
LLRF
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Reminder of Key RF Requirement
Operating Frequency 500 MHzNumber of Cavities 2 (3 eventually)Superconducting TechnologyIOT based amplifiers 300 kW eachWR 1800 waveguide450 W Liquid Helium Refrigeration plant
No IDs Day 1 IDs 22 IDs
Energy (GeV) 3 3 3
Energy lost in dipoles (MeV/turn)
1.0 1.0 1.0
Total losses (MeV/turn) 1.05 1.25 1.78
Beam Current (mA) 300 500 300 500 300 500
Beam Power (kW) 315 525 375 625 534 890
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Amplifier Update – 3 off amplifiers from Thales
Air and water cooling calibratedLow power calibratedCombiner set up and low power balancedIOT switch-on next week
Problems encounteredThalesSwitches in switching modules changed
Poor match on reject loadsDelayed deliveryTypical calibration and wiring etc
DLS Delay on drive amplifiersDelay to hand over of areaSerious delay to water cooling supply
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Amplifier Update Cont.
IOTs
Hybrid combiners
Switchless combiner
Reject load
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Coax load return loss (40% glycol) 28 dB or betterCombiner (IOT inputs) return loss 33 to 39 dB Isolation between IOTs 30 dB
Amplifier Update Cont.
Hot off the Press!!
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Amplifier Update Cont.
300 kW Circulator
300 kW load
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Amplifier Update Cont.
Delivery by end of Dec 2004Installation to start in January 05Testing with water End of Feb 05
PSU
Secondary water circuit
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Cavity Update – 3 off cavities from ACCEL
Cavity straight – based on Cornell type cavitiesTaper 5:1 or betterIncreased thickness of waveguide and stiffer grade of NiobiumMulti-channel transfer lines for helium supplySpace limited, hence mechanical modifications to inter cavity pieces and boot-box
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ACCEL Update
Rust on cavity cells
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ACCEL Update cont.
DLS Cavity components
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ACCEL Update cont.
Vertical test of CLS modules at Cornell
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Drive Amplifiers – 9 off from Wessex Electronics
500 W IOT Drive Amplifier and Control Unit
• Designed to deliver 500 W at 500 MHz CW
• Control Unit φ & G control allow balancing of all four drive amps
• Control unit provides remote control of φ & G settings and system monitoring
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Performance Data
Wessex Electronics manufacture test results:-
• Nominal Gain 57 dB (ie 0dBm for 500 W O/P)
• SS Gain Flatness 0.3 dB (over 4 MHz bandwidth)
• LS Gain Flatness 0.15 dB (over 4 MHz bandwidth)
• Max output power @ 500 MHz 509 - 540 W
• Harmonic Content -50.8 dBc
• Spurious @ 0 dBm input -75.6 dBcFirst completed unit is with Thales for IOT testing.No testing at DLS yet!
Drive Amplifiers cont
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Waveguide
Order placed with Microwave Marketing (MEGA) for two waveguide runs
Each run includes • 3-stub tuner• Short circuit switch• Two flexible sections• Arc detector• Reflectometer (dual coupler)• Camera port
Delivery by end of December 2004
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Master Oscillator• Phase noise specification is being derived from allowable bunch
jitter & SNR required for cavity regulation• Possible sources are: MA2040, SML01, PTS620
LLRF - Phase, Gain and frequency control
Main parameters:• Amplitude regulation 0.5%, resolution 0.05% step• Phase stability 0.2°, resolution 0.5° step• Dynamic range 26 dB• Variable control of bandwidth• +/- 180° static phase control
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Matlab model of cavity and RF plant is being developed to:• understand cavity drive requirements• optimise LLRF control loop dynamics• obtain transfer function from MO to cavity
LLRF
5 Tender Returns received and under evaluation
Wide variety of implementations including:• IQ mod/demod, analog conditioning, VME control• Amp/Φ detection, possible IF, digital control (powerPC), IQ remod• Amp/Φ detect, VME DSP control• Cartesian loop (amps & IOT) + cavity loop: Amp/Φ detect, DSP
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Cryogenic Plant – Turn key contract with Air Liquide
Refrigeration (Helial 2000) 450 WSufficient for two (and possibly 3) cavity operation
Design for cryostat pressure of 1.2 bar ASingle compressor with variable frequency driver2000 L liquid helium dewar3 off 8 m buffer tanks (liquid equivalent ~ 2000 L)Multi-channel transfer line to ACCEL ValveboxAtmospheric heat exchanger for warm-up and cool-downPermanent gas analysis cabinet
Additional entries on Dewar for superconducting Wiggler
System being designed for possible upgrade for further coldbox
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Cryogenic Plant
Helial 2000 coldbox
Buffer Tanks
SRRC 1 (similar to Diamond installation)
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Detailed RF Results and performance
ESLS RF 2005!
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SummaryBuilding – related to RF• Access to RF Hall on 29th October• Chilled raw water supply late (August 2005?)• Install temporary chiller with associated pipe work• Platform to be installed by end of Dec (Nov?)
RF Plant• AL to make first delivery of compressors by end of Dec• Thales to deliver by end of Dec• Full complement of drive amplifiers by end of Dec• Remaining cryo plant March/April 2005• Cavity 1 delivery April 2005
Key timescales• Thales Installation to start January 2005• Amplifiers commissioned by 25th April – 12 July 2005• LN2 commissioned by 25th March (from Dewars)• Cryo plant installation to start 13th April 2005, commissioned
by 13th June• First cavity fully tested 1st August, 2nd by 20 August
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Thanks to
Alun WatkinsMatt MaddockAdam RankinSimon Rains