Patent or Perish? Presented By: John F. Letchford Archer & Greiner, P.C. October 19, 2006.
The RAL Front End Test Stand David Findlay for Alan Letchford Accelerator Division, ISIS...
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Transcript of The RAL Front End Test Stand David Findlay for Alan Letchford Accelerator Division, ISIS...
The RAL Front End Test StandDavid Findlay for Alan LetchfordAccelerator Division, ISIS DepartmentRutherford Appleton Laboratory
HIPPI-05, Cosener’s House, Abingdon, 28–30 September 2005
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RAL Front End Test Stand (FETS)Part of CCLRC’s generic R&D programme on high power proton acceleratorsSpecifically, demonstration of some key technologies for the front ends of
Spallation neutron sourcesNeutrino factoriesWaste transmutersTritium productionEnergy amplifier
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FETS is a collaborative effort amongstCCLRC RAL ISISCCLRC ASTeC Intense Beams GroupDept. Physics, Imperial College, LondonDept. Physics, University of Warwick
Promotion of accelerator science in UK universities
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FETS collaboratorsJohn Back, Giulia Bellodi,Mike Clarke-Gayther, Dan Faircloth, Graham Gosling, Stephen Jolly,Ajit Kurup, Alan Letchford,Eddie McCarron, Ben Pine,Dan Ciprian Plostinar, Jürgen Pozimski, Peter Savage, Mark Whitehead,Trevor Wood
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FETS fundingCCLRC, through ASTeC
ISIS and ASTeC staff + hardwarePPARC, through ASTeC
UK university staffCCLRC, through Infrastructure Fund
Reconfiguration of test stand areaEU, through HIPPI programme
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RFQ
Chopper
FETS main components:High brightness H— ion sourceMagnetic LEBTHigh current, high duty factor RFQVery high speed beam chopperComprehensive diagnostics
RFQ
Chopper
Building R8 — being reconfigured for FETS
FETS builds on experience from ISIS RFQ test stand
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FETS specification60 mA H—, 2 ms, 50 pps75 keV 3-solenoid LEBT3 MeV, 324 MHz RFQ2 ns choppingComprehensive diagnosticsTest stand in practice
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H— surface Penning ion source35 mA, 200 µs (ISIS) 60 – 70 mA, 1 – 2 msIncrease largely achieved
Separate Penning fieldThermal modellingElectromagnetic modellingExtensive experimental work on dedicated ion source development rig
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0 500 1000 1500 2000Time (us)
Beam Current (mA)Discharge Current (A)Extract Volts (kV)
Good extraction over 1.75 ms arc at 50 pps
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3-solenoid magnetic LEBTDesign proceeding well
Beam chopper[Other talks]
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RFQ — 3 MeV, 324 MHzReady availability of Toshiba E3740A 3 MW pulsed klystron (J-PARC)Electromagnetic DTL quadrupoles
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RFQ beam dynamics at 324 MHz encouraging
3 MeV, 4 metre design95% transmission, 80 kV electrode voltage
Low voltage design 4-rod type possible4-rod and 4-vane designs being investigated
4-rod RFQ has at least one operational advantage
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DiagnosticsFull suite of diagnostics to maximise the experimental capabilities
Beam currentsEmittancesEnergy spectra (magnetic + gas scattering spectrometers)Non-destructive laser/opticalResidual gas ion spectroscopy
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Possible beam halo monitor?Activate scandium annulus?45Sc(p,n)45TiEthresh 2.8 MeV, 45Ti t½ 3 hours, 85% β+ decay
Low background2.5 mA mean, 10—5 halo, 100 seconds → 30 BqSc melts
1540°C
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Radiation shielding60 mA, 2 ms, 50 pps, 3 MeV into copper
2 – 3 × 1010 neutrons/second ~100 mSv/hour at 1 metre
Say lose 3% ~1 mSv/hour at 2 metres~1 metre concrete ~1 µSv/hour
C (graphite) or Al(-Si alloy) for beam dump?C: 13C(p,n) threshold 3.00 MeV (13C (1.1%)); 10-minute 13N from 12C (p,γ)Al-Si: (p,n) > 5 MeV; no activity from (p,γ)
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ConclusionsRAL Front End Test Stand will make an important contribution to HPPA R&DGood progress from RAL/ISIS, ASTeC, Warwick and ImperialBuilds on experience gained with ISIS RFQpre-injector upgradeFirst LEBT beam anticipated for 2006