Progress towards the ERLP at Daresbury Neil Bliss ESLS Workshop 15 -16 th November 2004 Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Contents • Aims & Objectives of Project • Timescales • Collaborations • Technical priorities • Progress on Design & Construction • Funding Opportunities • Acknowledgements Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Research, Development and Design Four years of funding for the research, development and design work needed to address the key challenges of the 4 GLS facility. · establish and operate 4 GLS ERL prototype facility · undertake 4 GLS underpinning physics studies · collaborate where other international efforts are directed at addressing problems of common interest Aims: To enable the development of core skills and to gain ‘hands on’ experience to meet the 4 GLS challenge • • Timescale April 03 – March 07 £ 14 million Project Manager – Professor Elaine Seddon Project Sponsor – Professor Colin Whitehouse, Director of Daresbury Laboratory Neil Bliss ESLS Workshop 15 - 16 th Nov 04
4 GLS: The Vision A world-leading synchrotron radiation facility to enable internationally outstanding science by the ‘low-energy’ community in the UK 4 GLS combines, for the first time, superconducting ERL, SR and FEL technology in a multi-source facility Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Timescales Case prepared for 4 GLS Investment Decision Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Timescales Funded* Not yet funded Case prepared for 4 GLS Investment Decision Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Timescales • Answer key questions defining layout Dec 04 – FEL layout options – 180 Bend – Beamline layouts • Engineering Layouts start Jan 05 • Further questions resolved Mar 05 – Switching – High current operation Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Timescales • • 4 GLS User Meeting First review of costs Detailed design for CDR Revise Layout & Costs Produce Project Plan Produce CDR Document CDR Published TDR to follow … Neil Bliss ESLS Workshop 15 - 16 th Nov 04 April 05 July 05 April 05 to Nov 05 Dec 05 Jan 06 Feb 06 end Feb 06
Collaborations In October John Wood signed Mo. Us with SLAC Jefferson Laboratory The agreements cover a broad spectrum of activities from accelerator studies through fast pulse diagnostics to scientific exploitation of FEL sources. Already have links with DESY Links with FZ Rossendorf (ELBE) developing e 2 v Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Technical Priorities for the ERL Prototype 1. Demonstrate energy recovery 2. Operate a superconducting linac 3. Produce and maintain bright electron bunches from a photo-gun 4. Produce short electron bunches from a compressor 5. Demonstrate energy recovery with an insertion device that significantly disrupts the electron beam 6. Have an FEL activity that is suitable for the synchronisation needs 7. Produce simultaneous photon pulses from a laser and a photon source of the ERL Prototype that are synchronised at or below the 1 ps level Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Parameters • • • Neil Bliss Nominal Gun Energy Booster Energy Gain Injector Energy Linac Energy Gain Circulating Beam Energy Linac RF Frequency Bunch Duty Factor-1 Bunch Repetition Rate Bunch Spacing Max Bunch Charge Particles per Bunch ESLS Workshop 15 - 16 th Nov 04 350 ke. V 8 Me. V 8. 35 Me. V 26. 65 Me. V 35 Me. V 1. 3 GHz 16 81. 25 MHz 12. 3 n. S 80 p. C 5 E+08
Parameters at long Pulse mode • • • Neil Bliss Average Current Peak Current Average Power at Injector Energy Average Power at Full Energy Peak Power at Injector Energy Peak Power at Full Energy ESLS Workshop 15 - 16 th Nov 04 13 m. A 6. 5 m. A 108. 6 W 455 W 54. 3 k. W 227. 5 k. W
ERLP Building Layout Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Accelerator Layout Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Start-to-end Simulations Elegant ASTRA Gun to Booster to FEL 0 to 8. 35 Me. V 8. 35/35 Me. V 250 k particles GENESIS FEL Interaction Elegant FEL to Dump 35/8. 35 Me. V 106 particles 1 250 k particles 4 3 2 First case of modelling an ERL together with a FEL and energy recovery Neil Bliss ESLS Workshop 15 - 16 th Nov 04
ERLP output Neil Bliss ESLS Workshop 15 - 16 th Nov 04
ERL Prototype Photoinjector Neil Bliss ESLS Workshop 15 - 16 th Nov 04
ERL Prototype Photoinjector Shield wall LASER ROOM ACCELERATOR HALL DC Gun Based on Jlab design Optical Table Commercial 500 k. V (350 k. V) 8 m. A DC Power Supply (Glassman Europe) Power supply and gun enveloped by 0. 8 Bar SF 6 environment Booster Cavity Laser Beam Transport System Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Laser Requirements The commercial solution Cathode material Cs: Ga. As Nd: Vanadate Laser material Electron bunch charge 80 p. C - - Bunch length 20 ps - - Bunch repetition rate 81. 25 MHz Pulse repetition rate Pulse train length 1 bunch and 20 -100 s - - Pulse train repetition rate Single shot and 1 -20 Hz Cw mode-locked Pulse train rep. rate Cathode efficiency 1 % - - Laser wavelength 532 nm 1064 / 532 nm Laser wavelength Laser pulse energy at cathode 20 n. J 61. 5 n. J 532 nm output energy per pulse Average power at cathode <4 m. W 5 W Average power Pulse length <20 ps 7 ps Pulse length (FWHM) Beam diameter at cathode 2 -6 mm (FWHM) 0. 6 mm Beam diameter output Neil Bliss ESLS Workshop 15 - 16 th Nov 04
290. 94 mm Diagnostics Laser System Layout 1846. 06 mm 1802 mm 1102 mm f=1750 mm 2 w Diagnostics f=762 mm Analyser Pockelsell c Shutter Chopper f=793 mm l/2 plate f=610 mm laser Plan View Schematic of Optical Table Layout Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Beam Transport System 2 -6 mm beam size on the cathode Gaussian on day 1 Flat top in later phase Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Pulse Structure Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Light Box Cathode Vacuum Valve Light Box Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Gun Assembly Cathode ball Ceramic SF 6 Cathode Vessel removed Electrons laser XHV Stem Anode Plate Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Ceramic • Controlled Resistivity Ceramic – WESGO • • Surface Resistivity Dielectric Strength Colour Material Delivery Cost Neil Bliss 105 -1013 W/sq 1010 -1012 W/sq 27 DC k. V/mm Black Al 970 CD End of Jan 05 £ 36 K ESLS Workshop 15 - 16 th Nov 04
Buncher Cavity 70 mm FZ Rossendorf Design Buncher cavity being manufactured by Vacuum Generators UK, available for testing end of November 04. Neil Bliss • Single Cell • 1. 3 GHz • Longitudinal bunch compression • No Acceleration • Zero-phase crossing angle ESLS Workshop 15 - 16 th Nov 04
Booster & Linac Modules Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Booster & Linac Modules FZ Rossendorf Module Helium transfer line 100 W Shield at 80 K Liquid helium vessel 2 K Accelerating module Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Booster & Linac Modules • Tesla 9 -cell cavity • • • ELBE Type Cryostat with dual Tesla Linac Sections Neil Bliss ESLS Workshop 15 - 16 th Nov 04 Order placed in March 04 – on Accel FZ Rossendorf Module – two TESLA cavities Energy Gain 26. 65 Me. V Independent control of Qext Independent control of cavity phase Delivery of module 1 (booster) due 28/11/05 Delivery of module 2 (linac) due 6/3/06 Cost £ 1. 7 m
Cryogenics Static Duty Dynamic Duty Total Duty Time Averaged TOTAL SYSTEM Cavities 45. 1 Main transfer lines 206. 4 litres / hour 24. 4 litres / hour Other equipment 12. 8 litres / hour Total consumption 82. 3 1650 Neil Bliss 161. 3 243. 6 109 litres / hour 974 2620 litres / day ESLS Workshop 15 - 16 th Nov 04
Cryogenics Order placed on Linde (TCF 50) • • Neil Bliss ESLS Workshop 15 - 16 th Nov 04 Delivery due in May 05 Cost £ 1. 26 m
Inductive Output Tubes RF to be supplied by IOTs that are being developed by the RF group in collaboration with e 2 v • • • Higher frequency than standard IOT – High Frequency IOT – 1. 3 GHz & 1. 5 GHz Cathode - grid transit time effects – Grid gap required – 0. 125 mm – Standard IOT – 0. 18 mm – Grid process capability – Cathode – grid gap setting Integral output cavity – Ability to set / maintain the required frequency 50 KV DC Power supply commissioned IOT’s available Now Neil Bliss ESLS Workshop 15 - 16 th Nov 04
IOT 116 LS Test Results Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Magnets • • • Being procured on a Performance Based Specification Preliminary modelling has taken place with FEA codes; minimal engineering design Field quality is responsibility of supplier. Magnets accepted on basis of magnetic measurements Large quantity (40%) of the magnets being loaned from JLAB 66 magnets in total required, 39 to procure • 9 Dipoles • 26 Quadrupoles • 4 Sextupoles + 28 H/V Correctors Tender Notice published OJEU 16 th September Return Date 3 rd November Bids received from 3 companies Currently evaluating bids Contract cost approx. £ 350 K Two delivery stages planned – Stage 1 (TL 2) end of May 05 – Stage 2 (Arcs & Dump) end of July 05 Neil Bliss ESLS Workshop 15 - 16 th Nov 04 Dipole A Good field: +/- 1 x 10 -4 over +/- 33 mm Quad D Good gradient: +/- 1 x 10 -3 over +/- 42. 5 mm
ERLP Layout New Magnets (39 off) Neil Bliss JLAB Magnets (27 off) ESLS Workshop 15 - 16 th Nov 04
Power Converter Ratings & Performance Family Number of magnets Rated Voltage (Volts) Rated Current (Amps) Dipole A 3 20 10 Dipole B 4 6. 3 40 Dipole C 2 5. 75 40 Dipole D 6 20 75 Dipole E 4 7. 5 90 Quad A 8 8 5 Quad B/C 16 18 10 Quad D 12 12 10 Quad E 3 16. 6 20 Quad F 4 12 5 Sext A 4 12 5 Total Neil Bliss 66 Plus 28 Bipolar Corrector power converters. • Quantity - All 66 magnets are individually powered. • Unipolar – Dipoles fitted with changeover circuit. • Interface – Remotely operated with analogue control. • Standardisation – Magnet ratings matched to reduce converter spares. • Operating range - 0 to 100% rated O/P current. • Stability - ± 100 ppm long term, measured at ± 20 ppm over 4 hrs. • Reproducibility - ± 200 ppm over a 24 hr period. • Resolution – 16 bit (15 ppm) ESLS Workshop 15 - 16 th Nov 04
Diagnostics Summary Beam position monitor (¾ ) - beam position - longitudinal bunch structure - current measurement - beam loss reference measurement. Unit A: H& V Slits/ pepper pot/ viewer - beam size directly - emittance measurement. Transverse kicker cavity - longitudinal characterisation of the beam. Analyser magnet - energy and energy spread Neil Bliss Units B: Viewer and vertical slit - emittance - image the beam - energy spread measurement. Unit C/E: Viewers - energy spread measurements - emittance measurements at the position of the first accelerating cell Faraday Cup - temporal structure of the pulse - total charge in the pulse - energy and energy spread ESLS Workshop 15 - 16 th Nov 04
Diagnostics Summary • 14 Optical Transition Radiation (OTR’s) Beam Viewers • 3 Florescent Screens (YAG’s) • Stripline EBPM 14 locations • Button EBPM 12 locations • Faraday Cup (in TL 2) • Total Current Monitor • Electro–optic sampling monitor Pneumatic operated mechanism Beam impedance screen Al foil OTR Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Stripline EBPM / Corrector coils Section Corrector Coils Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Arc EBPM Arc Dipole Magnet EBPMs Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Building Work Progress • Renovation of old SF 6 tanks for gaseous He • Laser room approaching completion • Ventilation system for control and diagnostics rooms being installed • Rack room well advanced • Bulk internal shielding complete (more than 2000 tonnes of concrete moved) • Plinths for external labyrinths laid Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Laser & Diagnostics Rooms Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Assembly Building Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Magnet Test Room Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Module 1 - Transfer Line 2 • Modular OTR Quadrupole Magnet Dipole Magnet • Majority of vacuum joints made in clean room • Services can be fitted • Modules can be built in parallel Lifting Points Girder Ion Pump Neil Bliss Corrector Coil and EBPM Assembly ESLS Workshop 15 - 16 th Nov 04 Support Pedestal
Module 4 - Injection Chicane Vessel OTR Ion Pump DV Magnet Neil Bliss ESLS Workshop 15 - 16 th Nov 04 DU Magnet Camera Tube
Module 16 - Compression Chicane Port for OTR Compression Chicane Chamber Support Magnet Support Quadrupole Magnet Neil Bliss Dipole Magnet DW ESLS Workshop 15 - 16 th Nov 04 Bolt on castors for use in assembly area
Assembly Philosophy, Supports and Adjustment Systems Survey points 1 st position the Magnets in their modules in the assembly building. 4 survey points per magnet Position of survey points to magnetic centre accurately known. Magnet Adjustment 2 nd Locate and drill pedestals in the Tower – position not critical 3 rd Survey modules into position in the tower Survey grid as global reference 4 survey points per girder Girder adjustment Pedestal This philosophy ensures that the magnetic centres of all the magnets are accurately positioned with respect to each other. Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Survey Equipment Faro Laser Tracker Repeatability 1 m +1 m /m Accuracy 10 m + 0. 8 m /m Uncertainty ≈ 10 m /m Portable Robust Spatial Analyzer Metrology Software Error Simulations Multiple instruments/types Automation Neil Bliss ESLS Workshop 15 - 16 th Nov 04
ERLP Positional Tolerances Local zone within ± 2. 5 m Global within ± 15 m Transverse X, Z ± 0. 1 mm ± 0. 5 mm Y ± 0. 5 mm ± 2. 5 mm Pitch Roll Yaw ± 0. 2 m. R Z ± 0. 05 m. R/m measuring length ± 0. 5 m. R for 150 mm long quadrupoles Yaw Pitch X Roll Y Co-ordinate System Neil Bliss ESLS Workshop 15 - 16 th Nov 04
ERLP – 1 st Grid Simulation 1 st Simulation of proposed reference grid in SA 76 Grid reference points 40 Instrument positions Each point measured by a minimum of 3 instruments Faro Tracker Grid reference points Neil Bliss ESLS Workshop 15 - 16 th Nov 04
ERLP – Simulation Results Most points can be surveyed to within +/- 50 m Worst point within +/- 82 m Instruments reference multiple points, worst Instrument position +/-13 m Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Vacuum Vessels Arc Straight chambers OTR chambers Bellows Dipole chambers OTR chambers Neil Bliss ESLS Workshop 15 - 16 th Nov 04 Taper transition
Rectangular to Circular Transition Taper Bellows circular cross-section Diameter 50 mm - NO RF SCREENING Arc rectangular aperture 80 mm hor. X 42 mm vert. Neil Bliss ESLS Workshop 15 - 16 th Nov 04
General Considerations To minimise the following: • Build up of contaminant layers on opticallyreflecting surfaces. • Cryodeposition of contaminant layers on the cold surfaces of superconducting cavities • System particles by: – using low particle production components – particle control measures during preparation and installation. Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Class 100 (ISO 5) Clean Room Monitoring LASAIR II Model 310/510 Particle sizing sensitivities from 0. 3 – 25 microns Vacuum Chamber Monitoring LASAIR II Model 110 Particle sizing sensitivities from 0. 1 – 5 microns Neil Bliss ESLS Workshop 15 - 16 th Nov 04
ERLP Vacuum Regions Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Example Pressure Profile • Numerical Method Using Math. Cad and/or Molflow to Generate Pressure Profiles –Input data includes dimensions and vacuum surface performance Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Control System - Options • SRS control system (based on CERN ISOLDE) • Very familiar design and techniques • Re-use of some hardware and software from SRS • Not supported outside of DL • EPICS – DL work on DIAMOND • Specifically designed for accelerator control systems • free and widely supported (used at JLAB) • Can re-use designs and systems developed for Diamond • SCADA (several systems) • Quick and easy to get going • Expensive licensing • More suited to process control applications & standalone systems Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Control System - Overview • The control system will use EPICS, VME and PC Consoles • Re-use designs already developed for SRS and Diamond • Limit control and monitoring of devices to a minimum • Ensure maximum flexibility and low development cost • Combine general control system with stand-alone and proprietary systems where necessary Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Current Funding Opportunities EU funding to help support the underpinning physics studies… § EUROFEL, FP 6 Design Studies Call, awarded, EU 9 M single pan European FEL bid on underpinning technical activities (top in Peer Review) North West Science Fund…. § £ 4 M outline bid successful: detailed bid submitted Sept 17 th Hope to hear in Dec 2004 Neil Bliss ESLS Workshop 15 - 16 th Nov 04
NW Science Fund bid: £ 4. 036 M If funded: • 3 year programme starting 2005 • X-ray generation by Thomson scattering • Laser-SR synergy • THz and tissue culture facility Other things were considered but were rejected – disruption to ERLP too great Neil Bliss ESLS Workshop 15 - 16 th Nov 04
Acknowledgments • All the team working on the Project • 4 GLS IAC • Collaborators n. bliss@dl. ac. uk http: //www. 4 gls. ac. uk e-mail Neil Bliss ESLS Workshop 15 - 16 th Nov 04
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