Ian Bailey Lancaster University / Cockcroft Institute Baseline Target Prototype Status TILC09, Japan.

Slides:



Advertisements
Similar presentations
I.R. Bailey, J.B. Dainton, L.J. Jenner, L.I. Malysheva (University of Liverpool / Cockcroft Institute)
Advertisements

Target Wheel Prototype Progress LC-ABD / LCUK – Apr Leo Jenner & Ian Bailey Cockcroft Daresbury Laboratory.
A Study of Mechanical and Magnetic Issues for a Prototype Positron Source Target The positron source for the International Linear Collider (ILC) comprises.
I.R. Bailey, J.B. Dainton, L.J. Jenner, L.I. Malysheva (University of Liverpool / Cockcroft Institute)
30/10/09 Positron Workshop 1 Future Work Plan, Action Items, Future Meetings Jim Clarke ASTeC & Cockcroft Institute Daresbury Laboratory.
ILC positron source simulation update Wanming Liu, Wei Gai ANL 03/20/2011.
Ian Bailey University of Liverpool / Cockcroft Institute Target Design and Photon Collimator Overview EUROTeV: WP4 (polarised positron source) PTCD task.
Using Realistic Photon Spectra Mike Jenkins Lancaster University and The Cockcroft Institute.
Simulations with ‘Realistic’ Photon Spectra Mike Jenkins Lancaster University and The Cockcroft Institute.
Ian Bailey University of Liverpool / Cockcroft Institute UK EUROTeV Photon Conversion Target Project EUROTeV: WP4 (polarised positron source) PTCD task.
Ian Bailey Cockcroft Institute/ Lancaster University October 30 th, 2009 Baseline Positron Source Target Experiment Update.
Mike Jenkins Lancaster University and The Cockcroft Institute.
Jan '09Positron Target Status1 Positron Target Prototype - Status Leo Jenner.
ILC Target Wheel Rotordynamics Lisle Hagler 5/23/2007 UCRL-PRES This work was performed under the auspices of the U.S. Department of Energy by University.
Prototype Status. 2 Status Update Safety Cage arriving soon Safety Cage arriving soon Torque transducer up and running Torque transducer up and running.
Tues Mar 24LC-ABD / LCUK, Bristol1 Positron Target Prototype - Status Leo Jenner.
Liverpool Accelerator Physics Group International Linear Collider (ILC) R&D The Cockcroft Institute The University of Liverpool is the lead organisation.
Status of the HELICAL contribution to the polarised positron source for the International Linear Collider The positron source for the International Linear.
06 Apr 09Target Prototype Metting1 Positron Target Prototype – Hardware Status Leo Jenner (T-25)
STFC Technology Target wheel eddy current modelling James Rochford On behalf of the Helical collaboration.
MICE Target Review Chris Booth Sheffield 12 th June 2006.
Mon Oct 27LC-ABD, Dundee1 Positron Target Prototype - Status Leo Jenner.
Tues Mar 24LC-ABD / LCUK, Bristol1 Positron Target Prototype - Status Leo Jenner.
Thu Oct 30ILC Positron Workshop, DL1 Positron Target Prototype – Current Status Leo Jenner Jim Clarke, Ian Bailey Ken Davies, Andy Gallagher, Lei Zang.
Status of Undulator-based Positron Source Baseline Design Leo Jenner, but based largely on a talk given by Jim Clarke to Positron DESY-Zeuthen,
Target Wheel Prototype Progress Zeuthen meeting – Apr 7-9 Leo Jenner & Ian Bailey Cockcroft Daresbury Laboratory.
Radiation Cooling of the ILC positron target LCWS 2014, Belgrade, Serbia 7 th October 2014 Sabine Riemann, DESY, Peter Sievers, CERN/ESS, Andriy Ushakov,
Initial wave-field measurements in the Material Diagnostic Facility (MDF) Introduction : The Plasma Research Laboratory at the Australian National University.
Ian Bailey University of Liverpool / Cockcroft Institute Positron Source Target Development Update Collaborators STFC Daresbury Laboratory, STFC Rutherford.
Undulator Based ILC Positron Source Studies Wei Gai Argonne National Laboratory CCAST ILC Accelerator Workshop Beijing, Nov 5 – 7, 2007.
Helical Undulator Based Positron Source for LC Wanming Liu 05/29/2013.
Ian Bailey University of Liverpool / Cockcroft Institute ILC Baseline Target Collaborators STFC Daresbury Laboratory, STFC Rutherforord Appleton Laboratory,
Key luminosity issues of the positron source Wei Gai.
Positron Source General Update M. Kuriki(Hiroshima U./KEK) ALCW2015, April 2015,Tsukuba/Tokyo, Japan.
Status of target and photon collimator work for polarized e+ LCWS 2014, Belgrade, Serbia 7 th October 2014 Sabine Riemann, Friedrich Staufenbiel, DESY.
Current standing of the undulator based ILC positron source Wei Gai AWLC 14 FNAL, May
Development of a Positron Production Target for the ILC Positron Source Capture Optics Positron beam pipe/ NC rf cavity Target wheel Vacuum feedthrough.
Ian Bailey University of Liverpool / Cockcroft Institute UK Target Update EUROTeV: WP4 (polarised positron source) PTCD task I. Bailey, J. Dainton, L.
20 April 2009 AAP Review Global Design Effort 1 The Positron Source Jim Clarke STFC Daresbury Laboratory.
Pump design Raimonds Nikoluskins CERN – LIEBE project coordination meeting.
CONVERSION EFFICIENCY AT 250 GeV A.Mikhailichenko Cornell University, LEPP, Ithaca, NY Presented at Positron Source Meeting Daresbury Laboratory,
Eddy current modelling for ILC target ILC meeting 31 st Jan- 3 rd Feb 2007 IHEP-Beijing James Rochford.
Welcome and Introduction to the Workshop Jim Clarke ASTeC & Cockcroft Institute Daresbury Laboratory ILC Positron Source Collaboration Meeting 29 – 31.
Discussion, Action Items, & Future Work Plan Jim Clarke ASTeC & Cockcroft Institute Daresbury Laboratory ILC Positron Source Collaboration Meeting 29 –
10/9/2007 Global Design Effort 1 Optical Matching Device Jeff Gronberg / LLNL October 9, 2007 Positron source KOM - Daresbury This work performed under.
Ian Bailey Cockcroft Institute/ Lancaster University IWLC October 21 st, 2010 Overview of Undulator-Based Sources for LC.
Parameters of the NF Target Proton Beam pulsed10-50 Hz pulse length1-2  s energy 2-30 GeV average power ~4 MW Target (not a stopping target) mean power.
Status: Cooling of the ILC e+ target by thermal radiation LCWS 2015, Whistler, Canada 3 rd November 2015 Felix Dietrich (DESY), Sabine Riemann (DESY),
F.Staufenbiel / EuCARD 2 / Heat load and stress studies of the ILC collimator G. Moortgat-Pick 1;2 S. Riemann 2, F. Staufenbiel 2, A. Ushakov.
Positron Source Target Update Tom Piggott Jeff Gronberg Lisle Hagler Dain Holdener Marty Roeben This work was performed under the auspices of the U.S.
Photon Conversion Target Wheel Eddy Current Simulations - Update Ian Bailey and Ayash Alrashdi Lancaster University / Cockcroft Institute.
Positron Source Update Jim Clarke ASTeC & Cockcroft Institute Daresbury Laboratory ILC 08, University of Illinois at Chicago, 17 th November 2008.
Undulator Based ILC positron source for TeV energy Wanming Liu Wei Gai ANL April 20, 2011.
ILC e - and e + sources overview Jim Clarke STFC Daresbury Laboratory, UK On behalf of ILC Positron Sources Group.
ILC Positron Production and Capturing Studies: Update Wei Gai, Wanming Liu and Kwang-Je Kim Posipol Workshop, Orsay, France May 23-25, 2007 Work performed.
Ian Bailey Cockcroft Institute/ Lancaster University September 30 th, 2009 Baseline Positron Source Target Experiment Update LCWA09.
Oct. 6, ILC Positron Source Group Meeting Short report by S. Riemann September 2006, RAL.
Positron Source for Linear Collider Wanming Liu 04/11/2013.
Progress with Zeuthen Meeting Actions Jim Clarke ASTeC, STFC Daresbury Laboratory.
325 MHz Superconducting Spoke Cavity Coupler status. T. Khabiboulline Power Coupler design for Superconducting Spoke cavities. Originally.
Photon Collimator and Conversion Target Status I. Bailey University of Liverpool / Cockcroft Institiute Cockcroft Institiute.
Polarised Positron Source Target and Collimator
University of Liverpool / Cockcroft Institute
A Positron Target Concept for the ILC
Pair-Production Target
NC Accelerator Structures
CLIC Undulator Option for Polarised Positrons
Future Work Plan and Action Items
ILC RDR baseline schematic (2007 IHEP meeting)
Helical Undulator Insertion Device The heLiCal collaboration
Presentation transcript:

Ian Bailey Lancaster University / Cockcroft Institute Baseline Target Prototype Status TILC09, Japan

PPS Schematic - ILC RDR RDR Parameters Relevant for Target and Collimator  Centre of undulator to target: 500m  Active (K=0.92, period=1.21mm) undulator length: 147m  Photon beam power: 131kW (~doubled if QWT adopted)  First harmonic: 10MeV  Beam spot: >1.7 mm rms

RDR Target Design Wheel rim speed (100m/s) fixed by thermal load (~8% of photon beam power) Rotation reduces pulse energy density (averaged over beam spot) from ~900 J/g to ~24 J/g Cooled by internal water-cooling channel Wheel diameter (~1m) fixed by radiation damage and capture optics Materials fixed by thermal and mechanical properties and pair-production cross- section (Ti6%Al4%V) Wheel geometry (~30mm radial width) constrained by eddy currents. 20cm between target and rf cavity. Axial thickness ~0.4 radiation lengths. T. Piggott, LLNL Drive motor and water union are mounted on opposite ends of through-shaft.

Complete Eddy current tests at Daresbury – Ian/Leo Nov 08 (store properly afterwards!) Generate simulations to compare with experimental results – Jeff / RAL? Nov 08 Guarding thickness verification – Tom (now) Pressure shock wave analysis – Stefan (next meeting) and numerical modelling – Tom (later) Ensure consistency between ANL/DESY simulations – Wei/Andriy (next meeting) –Energy compression before DR Lifetime studies of target (LLNL) Engineered solution, including prototype tests – water, vacuum, … Alternative liquid metal (BINP/KEK tests) – Junji Where are ferrofluidic seals used – Ian (next meeting) Simulations started at both LLNL (C. Brown) and RAL (J. Rochford). Prototype guarding in place. Target Actions from Zeuthen Meeting (2008) Data-taking ongoing (see this talk)

Target Wheel Eddy Current Simulations  Alternative capture optics, alternative materials, prototyping Immersed target  up to a factor 2.5 increase in capture efficiency c.f. QWT For 1T static field at ~2000rpm RAL predicts ~6.6kW ANL predicts ~9.5kW S. Antipov PAC07 proceedings LLNL predicts ~15kW?

Target Prototype Design Prototype I - eddy current and mechanical stability Ken Davies - Daresbury Laboratory Torque transducer 15kW motor Dipole magnet m wheel ~18kg Accelerometers

Target Prototype with Local Guarding Support Structure Ken Davies - Daresbury Laboratory Wheel design supported by rotordynamic and fatigue calculations from LLNL. Cross- checks carried out at RAL. Guarding design (5mm st steel) supported by FEA studies at LLNL and analytical studies at the CI.

Target Prototype Status Experimental area at DL allocated and caged (Summer 2007) Services rerouted (water and electricity) Magnet and support structure installed – model GMW water-cooled electromagnet –variable pole gap (0mm to 160mm) –variable target immersion (~70mm) Drive motor (15kW) installed Ti alloy wheel manufactured and installed –Also possible Al wheel (grade 5083). DAQ design finalised –Accelerometers installed and interlock fitted. –Torque transducer installed. –Thermal cameras awaiting installation –Hall probes available Cooling system implemented. Local guarding installed Sep 08. Data-taking underway.

Initial Torque Data (no magnetic field) The upper figure shows the measured torque (Nm) as a function of time (s). The lower figure shows the measured speed over the same period of time. The torque is sampled at a rate of 2.4kHz. The speed is sampled at a rate of 0.6kHz. Torque (Nm) Speed (rpm)

Understanding the Torque Data Without magnetic field expect average torque given by dark blue line. Motor controller and structure of motor coils, bearings, etc add oscillations (yellow line) Magnetic field causes eddy currents to flow in rim (purple line) Additionally, eddy currents can flow in spokes when they are close to the magnet poles (light blue line). Toy model

Resonances 198 rpm 174 rpm Left figure: wheel accelerated past 198 rpm and then decelerated. Right figure: wheel accelerated to 174 rpm and then decelerated. Resonances correspond to mechanical excitations of the wheel assembly. L. Zang - Liverpool

Nominal Design Basis Bearing + Mount Stiffnesses Support Translational Stiffness = 1,000,000 lbf/inSupport Rotational Stiffness = 10,000 lbf*in/rad Sources of Rotor Excitation Lorentz 5/rev 1/rev Major Critical Speeds 1 st Wheel ~ 200 RPM 2 nd Wheel ~ 1100 RPM Cylindrical ~ 3200 RPM Forward Tilt ~ 5000 RPM Reverse Tilt ~ 4200 RPM Operating Speed Range Rotor Whirl Frequency (rad/s) Tilt Whirl Mode Cylindrical Whirl Mode Wheel Out-of-Plane Flex Mode (FM) 5/rev 1/rev --- Critical Speed Location Wheel Out-of-Plane Flex Mode Campbell Diagram Predicted Critical Speeds Lisle Hagler - LLNL

Torque Fourier Spectra Duncan Scott - DL Origin of peak at ~135Hz not yet understood.

Characterising Frictional Forces Wheel has not yet been operated above 500 rpm In this regime friction shows approximately linear increase with velocity Extrapolates to ~3Nm at 2000rpm, but behaviour may change at higher velocity.

Characterising Frictional Forces (2) Immersion depth of wheel in magnetic field is varied from 40mm to 20mm, 20mm to 90mm and 90mm to 40mm. Data sets at 40mm immersion show disagreement. Interpretation: heating effects in bearing cause friction to alter with time… 250 rpm 0.485T

B Dependence of Torque Black line shows extrapolation from data using quadratic fit.

Carmen (spoke) Model Mesh distribution in wheel J. Rochford, RAL I-1 I-4 I-2 I-3 I-0 I-0=I I-3+I-4=590A I-1=I-4=265A 1-2=I-3=30A

Carmen Model (2) J. Rochford, RAL

CARMEN Model Prediction J. Rochford, RAL

CARMEN Model Prediction (2) Peak (yellow), average (magenta) and minimum (blue) torques as predicted by the CARMEN model for rim immersed in 0.489T field. Data at 250rpm gives average torque due to field = 2.07Nm Nm friction = 0.94Nm c.f. CARMEN average 2.08Nm… Corresponds to ~7.8kW Corresponds to ~3.9kW Corresponds to ~1.3kW

Summary Prototype complete. Data-taking began Nov 08. CARMEN model developed at RAL. –Consistent with earlier ELECTRA (rim-only) model. –Effect of spokes expected to be large. –Preliminary analysis of data (<500 rpm) does not show spoke effect in either average torque or torque spectrum.

Further Work Complete characterisation of friction. Proceed to higher speeds. Eddy current model for cross-checking being developed at LLNL. Remove motor-controller from torque signal by allowing the wheel to coast down from high speeds with the motor electrically disconnected. Use Fourier spectrum to analyse spoke effects. Rotordynamic analysis. Thermal analysis. Sufficient to measure average torque.