First Results from the ERL Prototype (ALICE) at Daresbury David Holder, on behalf of the ALICE team. LINAC'08 Victoria, BC.

Slides:



Advertisements
Similar presentations
Low Alpha & CSR in the MLS (PTB) G. Wüstefeld (BESSY) et al, ESLS XVI, Daresbury, Nov 28th Low Alpha Optics and Coherent Synchrotron Radiation.
Advertisements

Injection system of the 4GLS light source B.L. Militsyn on behalf of 4GLS team ASTeC STFC Daresbury Laboratory ERL07 Workshop, Daresbury,
Compression Scenarios for the European XFEL Charge and Bunch Length Scope Igor Zagorodnov 1st Meeting of the European XFEL Accelerator Consortium DESY,
Diamond Field-Emission Cathodes as High- Brightness Electron Sources Bo Choi, Jonathan Jarvis, and Charles Brau Vanderbilt University.
S. N. HOM Impedance in Vacuum … 1 of 40 Sasha Novokhatski SLAC, Stanford University Machine-Detector Interface Joint Session April 22, 2005 HOM Impedance.
FEL Beam Dynami cs FEL Beam Dynamics T. Limberg Short Bunches at FLASH.
Status and Future of BESSY RF BESSY II operating since 1999 Willy Wien Laboratory groundbreaking 9/2004 HoBiCaT Testfacility for sc cavities Commissioning.
The development of ultra bright electron sources: An overview B.L. Militsyn Accelerator Science and Technology Centre Science & Technology Facility Council,
H – Ion Source Development at RAL & FNAL PASI Meeting, RAL 3 rd April 2013 Scott Lawrie & Dan Faircloth (RAL) Dan Bollinger (FNAL)
ERLP / ALICE: a bit of history Yuri Saveliev. ... how all this started SRS DIAMOND ERLP 4GLS... to greener pastures.... Oh yes ! We get there Hmmmm.
February 17-18, 2010 R&D ERL Dmitry Kayran R&D: G5 test and Commissioning Plan Eduard Pozdeyev, Dmitry Kayran BNL R&D ERL Review February 17-18, 2010 R&D.
Diagnostics and commissioning on ERLP Yuri Saveliev ASTeC CONFORM Project: EMMA Design Review Workshop February 2007, Daresbury Laboratory.
ERLP Overview Hywel Owen ASTeC Daresbury Laboratory.
Commissioning August & September. 2 Agenda 11:20 Coffee 11:30 Introduction Sue S 11:35 Controls (an overview) Brian M 10:55 Controls & Data Acquisition.
ALICE : Superconductive Energy Recovery Linac (ERL)
ALICE Status and News Susan Smith Director of ASTeC, STFC E lectron M odel for M any A pplications.
Before aperture After aperture Faraday Cup Trigger Photodiode Laser Energy Meter Phosphor Screen Solenoids Successful Initial X-Band Photoinjector Electron.
Generation and Characterization of Magnetized Bunched Electron Beam from DC Photogun for MEIC Cooler Laboratory Directed Research and Development (LDRD)
ALICE Commissioning Successes S.L.Smith, and of course the rest of the ALICE team!
SRF Results and Requirements Internal MLC Review Matthias Liepe1.
New Electron Beam Test Facility EBTF at Daresbury Laboratory B.L. Militsyn on behalf of the ASTeC team Accelerator Science and Technology Centre Science.
Modelling of the ALICE Injector Julian McKenzie ASTeC STFC Daresbury Laboratory IOP Particle Accelerators and Beams Group Status and Challenges of Simulation.
Peter McIntosh (STFC Daresbury Laboratory) 2 nd PASI Workshop, RAL April 3 - 5, 2013.
Low Emittance RF Gun Developments for PAL-XFEL
ASTRA Injector Setup 2012 Julian McKenzie 17/02/2012.
High Current Electron Source for Cooling Jefferson Lab Internal MEIC Accelerator Design Review January 17, 2014 Riad Suleiman.
Recent Experiments at PITZ ICFA Future Light Sources Sub-Panel Mini Workshop on Start-to-End Simulations of X-RAY FELs August 18-22, 2003 at DESY-Zeuthen,
Lee Jones Accelerator Physics Group ASTeC STFC Daresbury Laboratory
FLASH II. The results from FLASH II tests Sven Ackermann FEL seminar Hamburg, April 23 th, 2013.
Accelerator Science and Technology Centre Extended ALICE Injector J.W. McKenzie, B.D. Muratori, Y.M. Saveliev STFC Daresbury Laboratory,
ICFA-HB 2004 Commissioning Experience for the SNS Linac A. Aleksandrov, S. Assadi, I. Campisi, P. Chu, S. Cousineau, V. Danilov, G. Dodson, J. Galambos,
1 ALICE and EMMA Yuri Saveliev … and many others at DL and beyond ASTeC, STFC Daresbury Laboratory IOP Particle Accelerators and Beams Annual Conference.
Electron Sources for ERLs – Requirements and First Ideas Andrew Burrill FLS 2012 “The workshop is intended to discuss technologies appropriate for a next.
Christopher Gerth DL/RAL Joint Workshop 28-29/4/04 Modelling of the ERLP injector system Christopher Gerth ASTeC, Daresbury Laboratory.
Commissioning and Utilisation of ERLP David Holder ASTeC, Daresbury Laboratory.
The Next Generation Light Source Test Facility at Daresbury Jim Clarke ASTeC, STFC Daresbury Laboratory Ultra Bright Electron Sources Workshop, Daresbury,
FLS2010 Workshop, Stanford, March 1-5, 2010 Florian Loehl (Cornell University) Commissioning of the High Current ERL Injector at Cornell Florian Loehl.
1 CTF3 CLEX day July 2006 CLEX day 2006 Introduction G.Geschonke CERN.
Future Circular Collider Study Kickoff Meeting CERN ERL TEST FACILITY STAGES AND OPTICS 12–15 February 2014, University of Geneva Alessandra Valloni.
Awake electron beam requirements ParameterBaseline Phase 2Range to check Beam Energy16 MeV MeV Energy spread (  ) 0.5 %< 0.5 % ? Bunch Length (
First Electrons at the Fermilab superconducting test accelerator Elvin Harms Asian Linear Collider Workshop 2015, Tsukuba 24 April 2015.
Development of High Current Bunched Magnetized Electron DC Photogun MEIC Collaboration Meeting Fall 2015 October 5 – 7, 2015 Riad Suleiman and Matt Poelker.
Experience with Novosibirsk FEL Getmanov Yaroslav Budker INP, Russia Dec. 2012, Berlin, Germany Unwanted Beam Workshop.
ALBA RF Systems Francis Perez.
Superconducting Magnet, SCRF and Cryogenics Activities at VECC *, Kolkata Shekhar Mishra Rakesh Bhandari *Department of Atomic Energy, Government of India.
PAL-XFEL Commissioning Plan ver. 1.1, August 2015 PAL-XFEL Beam Dynamics Group.
Electron Beam Test Facility (EBTF) & Photocathode R&D programme at Daresbury Laboratory Deepa Angal-Kalinin ASTeC, Daresbury Laboratory 27 th January’12,
Development of High Brightness Electron Photoinjectors at ASTeC B.L. Militsyn Accelerator Science and Technology Centre Science & Technology Facility Council,
Capabilities and Programmes of STFC’s Accelerator Science & Technology Centre (ASTeC)
Seesion1 summary Unwanted Beam Workshop (UBW 2012) Dark Current Issues for Energy Recovery Linacs.
An Electron source for PERLE
Beam Commissioning Adam Bartnik.
ALICE Commissioning Successes
Linac beam dynamics Linac dynamics : C. Bruni, S. Chancé, L. Garolfi,
Degradation and Recovery of Cavity Performance
Beam dynamics for an X-band LINAC driving a 1 keV FEL
Sara Thorin, MAX IV Laboratory
UK-XFEL WP1 – Electron Injector Development
BUNCH LENGTH MEASUREMENT SYSTEM FOR 500 KV PHOTOCATHODE DC GUN AT IHEP
Accelerators in a new light
DC Injector and Space Charge Simulation Status
Joint Accelerator Research JGU & HZB
Magnetized Bunched Electron Beam from DC High Voltage Photogun
MIT Compact X-ray Source
Center for Injectors and Sources
Advanced Research Electron Accelerator Laboratory
Jim Clarke ASTeC Daresbury Laboratory March 2006
Selected simulations for XFEL photo injector
LCLS Injector/Diagnostics David H. Dowell, SLAC April 24, 2002
Injector for the Electron Cooler
Presentation transcript:

First Results from the ERL Prototype (ALICE) at Daresbury David Holder, on behalf of the ALICE team. LINAC'08 Victoria, BC

2 Contents Introduction Overview of Gun Commissioning Cryogenics, Superconducting Modules & RF System Status Next Steps Summary Credits

3 Introduction: –New Name –ALICE & EMMA Layout Overview of Gun Commissioning Cryogenics, Superconducting Modules & RF System Status Next Steps Summary Credits

4 ERLP (Energy Recovery Linac Prototype) –conceived as a prototype of an energy recovery-based 4 th generation light source... now called... ALICE (Accelerators and Lasers In Combined Experiments) –An R&D facility dedicated to accelerator science and technology development; –Offering a unique combination of accelerator, laser and free-electron laser sources; –Enables studies of photon beam combination techniques; –Provides a suite of photon sources for scientific exploitation. New Name No, not THAT ALICE…

5 ALICE & EMMA Layout Nominal Gun Energy350 keV Injector Energy8.35 MeV Beam Energy35 MeV RF Frequency1.3 GHz Bunch Rep Rate81.25 MHz Nom Bunch Charge80 pC Average Current 6.5 mA (over the 100 µ s bunch train)

6 Introduction Overview of Gun Commissioning –Photoinjector –Gun Problems –Gun Diagnostic Layout –Gun Commissioning Results –Gun Commissioning Summary Cryogenics, Superconducting Modules & RF System Status Next Steps Summary Credits

7 Photoinjector Gun ceramic – major source of delay – at Daresbury (~1 year late) Copper brazed joint (First electrons August 2006)

8 Gun Problems High voltage breakdown problems after cathode caesiation and from braze disintegration; Vacuum failures during bake-out of large diameter flange seals, feedthrough, valve and braze (again!); Contamination (caesium again?) and hydrocarbons; – impaired XHV conditions, field emission, halo, poor cathode lifetime.

9 Gun Diagnostic Layout Injector commissioned with dedicated diagnostic line (now removed):

10 Gun Commissioning Results (1 of 3) RMS emittance (pi-mm-mrad) RMS emittance vs. bunch charge Bunch 0.1 ( micrometres) ASTRA Bunch Charge, pC ASTRA Bunch length (at 10% of peak value) vs. bunch charge

11 Gun Commissioning Results (2 of 3) Energy spread (at 10% of peak value) vs. bunch charge Compensated = buncher ON

12 Gun Commissioning Results (3 of 3) Beam size vs. solenoid 1 & 2 current, at Q=54 pC, compared to ASTRA model

13 Gun Commissioning Summary Results: –The gun can now be routinely HV conditioned to 450kV; –QE above ~3% is normally achieved after cathode activations (bunch charges of well above 100pC have been achieved); –The beam was fully characterised (emittance, bunch length, etc.) for bunch charges between 1 to 80pC; –A good agreement between the ASTRA simulations and the experimental data was found for the bunch length and the energy spread but not for the emittance; –Bunch characteristics were investigated at two different laser pulses of 7ps and 28ps: At low Q<20pC, no significant difference was observed; –The importance of a smooth longitudinal laser profile for minimisation of the beam emittance was demonstrated. Remaining gun-related issues: –Ensure the absence of FE spots on the cathode; –Increase the cathode lifetime with QE >1.5%; –Resolve transverse emittance discrepancy (FE? QE non-uniformity?).

14 Introduction Overview of Gun Commissioning Cryogenics, Superconducting Modules & RF System Status: –Cryosystem Commissioning –Booster Module & RF Layout –Module Commissioning Results –Field Emission Radiation Issue –Mitigating Strategies Next Steps Summary Credits

15 Cryosystem Commissioning Partial system procured from Linde; 4 K commissioning completed May 06; SRF Module delivery April and July 06; Problems with excessive system heat leaks (lack of capacity) and heater failure; Cryosystem output: –Specification 118 W at 2 K with 1 mbar stability; –Measured 118 W at 2 K with ± 0.03 mbar stability in May 07; Static load: –Specification < 15 W per module; –Measured 5 W for both modules (i.e. ~2.5 W each); System has operated successfully at 1.8 K – needs further optimisation.

16 Cavity 1, 4.8 MV/m Booster Module & RF Layout Cavity 2, 2.9 MV/m

17 Module Commissioning Results 7.0 x MV/m 1.9 x MV/m 1.3 x MV/m 3.5 x MV/m QoQo Max E acc (MV/m) FE QuenchRF PowerFE Quench Limitation 5 x Cavity 2 5 x Cavity 1 Booster 5 x 10 9 QoQo E acc (MV/m) Cavity 2Cavity 1 Linac Vertical Tests at DESY (Jul – Dec 2005) Module Acceptance Tests at Daresbury (May – Sept 2007)

18 Field Emission Radiation Issue At 9 MV/m (c.f. required value of 13.5), radiation monitor in linac LLRF rack goes into saturation. Predicted electronics lifetime only around 1000 hrs.

19 Mitigating Strategies Lead shielding installed around linac; New linac module (collaborative design); Further aggressive processing: –Over longer conditioning periods; –Varying frequency, pulse width and pulse repetition rate; –CW conditioning (only possible at lower power levels); –Possibly condition the cavity when warm; –Introduce helium into the vacuum (risky!)

20 SC Module Commissioning Summary All 5 IOTs are successfully commissioned; All 4 cavities show unexpected limitations due to field emission; ALICE operation at 35 MeV is still possible; Measurements of cryogenic losses at intermediate gradients show significant reduction compared with vertical test results; High levels of FE radiation measured and mitigating strategies implemented.

21 Introduction Overview of Gun Commissioning Cryogenics, Superconducting Modules & RF System Status Next Steps: –Accelerator (short term) –Science Programme –Accelerator Developments –EMMA Summary Credits

22 Accelerator (short term) First energy recovery (Fall 2008): –Without FEL, installation planned Spring 2009; Fine tuning: –Injector tuning for minimum emittance; –Optimisation of energy recovery at nominal beam parameters; –Beam diagnostics; Short pulse commissioning stage: –Longitudinal dynamics, electro-optical diagnostic studies; Energy recovery with FEL (Spring 2009): –First light! –Energy recovery of a disrupted beam. Then the fun really starts …

23 Science Programme IR FEL, CBS x-ray source and terahertz radiation research programme, including pump – probe research programme with all ALICE light sources: –Terawatt laser (~10TW, 100 / 35 fs, 10Hz); –Infrared FEL (~4 µ m, ~15MW peak, ~1ps, ~10mJ); –Femptosecond tunable laser; –Terahertz radiation (broadband); –CBS x-ray source (15-30keV, 10 7 – 10 8 photons/pulse, <1ps); –Tissue Culture Laboratory (TCL).

24 Mobile laser CBS TW Laser Phase I Phase II Wiggler E-BEAM EO diagnostic IR FEL 4-6 µ m THz IR FEL 4-6um CBS X-ray 532 nm Photogun laser Science Programme

25 Accelerator physics research: –Photocathode research and testing (upgraded load-lock system for cathode exchange & activation); –New linac module; –Re-establishment of gun diagnostic line. EMMA - Electron Machine with Many Applications: –Non-scaling fixed field alternating gradient accelerator; Accelerator Developments Why FFAG ? fast acceleration (e.g. muons) high power beam acceleration variable electron energy Why Non-Scaling ? compact beamline vacuum chamber hence, compact magnets

26 EMMA Applications : medical (oncology) muon acceleration Accelerator-Driven Sub-critical Reactor (ADSR)

27 Introduction Overview of Gun Commissioning Cryogenics, Superconducting Modules & RF System Status Superconducting Module Status Next Steps Summary Credits

28 Summary Accelerator commissioning has now reached a critical stage; ALICE has provided the UK with an opportunity to develop generic technologies and skills important for the delivery of advanced accelerator-driven facilities, including: –Photoinjector, SCRF, cryogenics, diagnostics, synchronisation etc. ALICE will provide a unique R&D facility in Europe, dedicated to accelerator science & technology development: –Offering a unique combination of accelerator, laser and free- electron laser sources; –Enabling essential studies of beam combination techniques; –Providing a suite of photon sources for scientific exploitation.

29 Introduction Overview of Gun Commissioning Cryogenics, Superconducting Modules & RF System Status Superconducting Module Status Next Steps Summary Credits

30 Credits The ALICE technical team: –Controls: Brian Martlew et al. –Vacuum: Tom Weston & Keith Middleman et al. –Installation engineering: Phil Atkinson et al. –Mechanical engineering: Neil Bliss et al. –Electrical engineering: Steve Griffiths et al. –Diagnostics: Rob Smith et al. –FEL: Jim Clarke et al. –Compton Back Scatter: Gerd Preibe et al. –THz Science: Mark Surman et al. –Running, Safety: Stephen Hill et al. –Photoinjector laser: Steve Jamison & Graeme Hirst et al. –Elaine Seddon, Mike Poole and Paul Quinn Our international collaborators including: –J Lab (George Neil, Fay Hannon, Kevin Jordon, Carlos Hernandez-Garcia, Tom Powers et al. – FZD Rossendorf (Peter Michel, Frank Gabriel et al.) –Cornell (Bruce Dunham) –Stanford University (Todd Smith) –Institute of Semiconductor Physics, Novosibirsk (Alex Terekhov)

31 Thanks for listening