PresentationColour

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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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Buildings Status Office Block
Contractual completion Dec. 12th
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Buildings Status Synchrotron
Linac tunnel
Booster tunnel
Concrete works and painting complete, A/c
ductwork and survey monuments in place DLS has
taken over control of these areas.
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Buildings Status Synchrotron
Storage ring tunnel
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
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Buildings Status Synchrotron
Experimental Hall
Concrete slab complete (apart from access zone to
inner area) 3 cranes installed and operational
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General RF Plant
Cryogenics
Waveguide
RF amplifiers
Cavity location
Rack mounted equipment
Platform
LLRF
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Reminder of Key RF Requirement
Operating Frequency 500 MHz Number of
Cavities 2 (3 eventually) Superconducting
Technology IOT based amplifiers 300 kW each WR
1800 waveguide 450 W Liquid Helium Refrigeration
plant
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Amplifier Update 3 off amplifiers from Thales
Air and water cooling calibrated Low power
calibrated Combiner set up and low power
balanced IOT switch-on next week Problems
encountered Thales Switches in switching modules
changed Poor match on reject loads Delayed
delivery Typical calibration and wiring
etc DLS Delay on drive amplifiers Delay to
hand over of area Serious delay to water
cooling supply
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Amplifier Update Cont.
Switchless combiner
Reject load
Hybrid combiners
IOTs
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Amplifier Update Cont.
Hot off the Press!!
Coax load return loss (40 glycol) 28 dB or
better Combiner (IOT inputs) return loss 33 to
39 dB Isolation between IOTs 30 dB
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Amplifier Update Cont.
300 kW load
300 kW Circulator
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Amplifier Update Cont.
PSU
Delivery by end of Dec 2004 Installation to start
in January 05 Testing with water End of Feb 05
Secondary water circuit
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Cavity Update 3 off cavities from ACCEL
Cavity straight based on Cornell type
cavities Taper 51 or better Increased thickness
of waveguide and stiffer grade of
Niobium Multi-channel transfer lines for helium
supply Space 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 f G control allow balancing of all
  four drive amps
• Control unit provides remote control of f G
  settings and system monitoring

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Drive Amplifiers cont
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 _at_ 500 MHz 509 - 540 W
• Harmonic Content -50.8 dBc
• Spurious _at_ 0 dBm input -75.6 dBc

First completed unit is with Thales for IOT
testing. No testing at DLS yet!
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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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LLRF - Phase, Gain and frequency control

• Master Oscillator
• Phase noise specification is being derived from
  allowable bunch jitter SNR required for cavity
  regulation
• Possible sources are MA2040, SML01, PTS620

• 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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LLRF

• 5 Tender Returns received and under evaluation
• Wide variety of implementations including
• IQ mod/demod, analog conditioning, VME control
• Amp/F detection, possible IF, digital control
  (powerPC), IQ remod
• Amp/F detect, VME DSP control
• Cartesian loop (amps IOT) cavity loop
  Amp/F detect, DSP

• 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

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Cryogenic Plant Turn key contract with Air
Liquide
Refrigeration (Helial 2000) 450 W Sufficient for
two (and possibly 3) cavity operation
Design for cryostat pressure of 1.2 bar A Single
compressor with variable frequency driver 2000 L
liquid helium dewar 3 off 8 m buffer tanks
(liquid equivalent 2000 L) Multi-channel
transfer line to ACCEL Valvebox Atmospheric heat
exchanger for warm-up and cool-down Permanent 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
SRRC 1 (similar to Diamond installation)
Buffer Tanks
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Detailed RF Results and performance
ESLS RF 2005!
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Summary

• Building 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 Watkins Matt Maddock Adam Rankin Simon Rains