Diamond RF Status

Morten Jensen

ESLS RF2004

Latest constructional Status

Photo. by Angelos Gonias, DLS, Aug. 30th 2004

Contractual completion Dec. 12th

Buildings Status: Office Block

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

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

Concrete slab complete (apart from access zone to inner area)

3 cranes installed and operational

Experimental Hall

Buildings Status: Synchrotron

General RF PlantCryogenics

RF amplifiers

Rack mounted equipment

Platform

Waveguide

Cavity location

LLRF

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

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

Amplifier Update Cont.

IOTs

Hybrid combiners

Switchless combiner

Reject load

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!!

Amplifier Update Cont.

300 kW Circulator

300 kW load

Amplifier Update Cont.

Delivery by end of Dec 2004Installation to start in January 05Testing with water End of Feb 05

PSU

Secondary water circuit

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

ACCEL Update

Rust on cavity cells

ACCEL Update cont.

DLS Cavity components

ACCEL Update cont.

Vertical test of CLS modules at Cornell

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

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

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

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

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

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

Cryogenic Plant

Helial 2000 coldbox

Buffer Tanks

SRRC 1 (similar to Diamond installation)

Detailed RF Results and performance

ESLS RF 2005!

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

Thanks to

Alun WatkinsMatt MaddockAdam RankinSimon Rains