Proton driver front end test stand Plans and organisation for 2004–05 David Findlay ISIS...
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Transcript of Proton driver front end test stand Plans and organisation for 2004–05 David Findlay ISIS...
Proton driver front end test standPlans and organisation for 2004–
05
David FindlayISIS Accelerator Division
STVLTVS EST QVI ACCELERATORIBVS CVRANDIS VICTVM QVAERIT
22
Why a front end test stand?
Prove key elements of high power proton accelerators
ApplicationsGeneric Spallation neutron sources Neutrino factories Transmutation machines Tritium generators Energy amplifiers Training / Young people / Real
hardwareSpecific ISIS upgrades UKNF UK academic accelerator community
33
ISISWorld’s leading spallation neutron sourceNatural wish to stay at or near frontUpgrade strategies importantCCLRC funding through ASTeC
UK Neutrino FactoryStrong drive from UKNF communityPPARC support for proton driver R&DSynergies with possible ISIS upgrades
UK academic communityImperial-CCLRC joint appointmentExtend university accelerator centres to protons
44
What’s in a front end?Ion source, LEBT, RFQ and beam chopper
Why does it matter?Where beam quality set for entire machine
What has to be tested?New, high performance ion sources, RFQs and beam choppers
ISIS 0.16/0.24 MW RunningSNS 1 MW Running soonJPARC 1 MW Running soonISIS 1, 2, 5 MW PlansUKNF 4 MW — a big step! Plans
55
Proton driver front end test stand at RAL
ISIS Accelerator Division CCLRC/ASTeCImperial College PPARCWarwick University PPARC
CCLRC/ASTeC ~£500k per yearPPARC ~£500k over three years
+ 1¾ x ½ SY/year EU (HPRI-CT-2001-50021) (~£30k/year)+ 3 x ¾ SY/year EU (HIPPI/CARE/ESGARD) (~£50k/year)
£2–2½M total
66
Relationship with CERN test stand
Formal cooperation through HIPPIMeeting last week at CERN
Spreading bets on beam chopper
But differentCERN test stand for Linac4 then SPLProton / H– ion sourcesRAL test stand more genericDifferences reflect organisation’s missions
77
RFQ
Bunch +
accel-
erate
Chopper
Switch in 2 ns
for~0.1 ms
LEBT
Match ion
source to RFQ
Ion sourc
e
60 mA
2 ms
Beam
stop
Dia
gn
osti
cs
Transverse emittancesEnergy & energy spectrumBunch widthHalo
Or RFQ - chopper - RFQ ?
88
H– ion source — Development required Based on ISIS H– ion source
LEBT — Revision of new ISIS LEBT sufficient
RFQ — Base on ISIS & ESS 4-rod RFQs ISIS RFQ designed for 10% RF duty factor cf.
ISIS 2% Most expensive item: ~1 MW RF driver
Beam chopper — Development required Based on ESS concept Not necessarily ESS frequency (280
MHz)
But need ion source, LEBT and RFQ to test beam chopper
H– ion source R&D programme — for future high power proton accelerators (e.g. for future spallation neutron sources) — × ~10 output required
1 inch
Important milestone passed
Successful thermal modelling of world leading ISIS ion source — extraction of surface temperatures
Excellent agreement between calculated and measured thermocouple temperatures
Anode
200°C
Ab initio calc. Meas.°C °C
Anode t/c 456 400 – 600Cathode t/c 501 440 - 530Body t/c 416 390 - 460
600°C Cathod
e
Beam chopper R&D programme — specialised hardware — fast, high voltage pulser specified and procured
>1 kV rise in <2 ns
A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M
Overall philosophyRF frequency? One RFQ or two? Interactions with ISIS?
Ion sourceFix Bruker Extract Power SupplyExperiments: separate Penning field, neutralisation, electrode geometryTest new geometry, higher extract potential and separate Penning field 0.4 SY, £20kFurther mods. + testsDesign, build & test ×2 larger ion source EU funding stops Dec-05 0.7 SY, £30kDesign "operational" sourceBuild "operational" source
LEBT[Pretty well blanked out by RFQ installation & commissioning work]Review performance of existing test stand LEBTMagnetic or electrostatic?Design new LEBT (MAFIA, magnet design, particle tracking, vacuum)Build new LEBT
RFQ[Pretty well blanked out by RFQ installation & commissioning work]Re-visit physics designRe-visit mechanical/thermal/vacuum designAssessment of RF driverSpecification of RF driver
Beam chopperMeasurements with Kentech pulsers — to check computer codesHigh voltage, high current MOSFET switch developmentThermal calcs. for beam dumpsRepresentative prototype meander line testRepresentative prototype lumped line testPre-production meander line testPre-production lumped line testRF cavities and quadrupoles, low level RF systems
DiagnosticsReview ISIS RFQ test stand diagnosticsDesign beam current measurement apparatusRe-use magn. spectr., gas scatt. spectr., coax. target?Specify suite of diagnostics (incl. halo m's'ment) (also beam dump)
Beam dynamicsBeam dynamics for LEBT, RFQ, chopper lineError limits for RF phase and gradient, quadrupole gradient, etc.
Infrastructure / Overall practicalitiesEstimate footprint for 2–3 MeV test stand / Clash with synch. RF area?Estimate radiation shielding incl. beam losses in RFQ, chopper)Estimate services requirements and ancillary apparatus requirementsProduce outline specification and drawing of test standExtend lead shed 0.025 SY, £50kBuild and install stands and supports
0.1 SY
1.0 SY, £50k
1.0 SY, £20k
0.3 SY, £20k0.2 SY, £50k
2.0 SY, £200k
0.2 SY, £5k0.1 SY, £5k
1.0 SY, £50k
0.1 SY, £50k
0.2 SY0.1 SY
0.1 SY, £5k
1.0 SY, £50k
0.05 SY1.25 SY, £20k
0.2 SY, £5k
0.2 SY, £15k
0.4 SY
0.05 SY0.025 SY
0.025 SY0.2 SY
0.2 SY
0.5 SY, £30k
0.5 SY, £25k
2004 2005 2006
0.2 SY
0.1 SY
0.8 SY, £50k0.4 SY, £50k
0.3 SY, £10k
2007
0.8 SY, £30k0.3 SY, £30k
Overall philosophyRF frequency? One RFQ or two? Interactions with ISIS?
Ion sourceFix Bruker Extract Power SupplyExperiments: separate Penning field, neutralisation, electrode geometryTest new geometry, higher extract potential and separate Penning fieldFurther mods. + testsDesign, build & test ×2 larger ion sourceDesign "operational" sourceBuild "operational" source
LEBT[Pretty well blanked out by RFQ installation & commissioning work]Review performance of existing test stand LEBTMagnetic or electrostatic?Design new LEBT (MAFIA, magnet design, particle tracking, vacuum)Build new LEBT
RFQ[Pretty well blanked out by RFQ installation & commissioning work]Re-visit physics designRe-visit mechanical/thermal/vacuum designAssessment of RF driverSpecification of RF driver
Beam chopperMeasurements with Kentech pulsers — to check computer codesHigh voltage, high current MOSFET switch developmentThermal calcs. for beam dumpsRepresentative prototype meander line testRepresentative prototype lumped line testPre-production meander line testPre-production lumped line testRF cavities and quadrupoles, low level RF systems
DiagnosticsReview ISIS RFQ test stand diagnosticsDesign beam current measurement apparatusRe-use magn. spectr., gas scatt. spectr., coax. target?Specify suite of diagnostics (incl. halo m's'ment) (also beam dump)
Beam dynamicsBeam dynamics for LEBT, RFQ, chopper lineError limits for RF phase and gradient, quadrupole gradient, etc.
Infrastructure / Overall practicalitiesEstimate footprint for 2–3 MeV test stand / Clash with synch. RF area?Estimate radiation shielding incl. beam losses in RFQ, chopper)Estimate services requirements and ancillary apparatus requirementsProduce outline specification and drawing of test standExtend lead shedBuild and install stands and supports
SY £k SY £k SY £k
0.200
0.300 300.800 300.400 20
0.500 300.700 300.100 7 0.200 13
0.200 50
0.1000.025 0.025
1.000 16 0.250 40.667 67 1.333 133
0.133 3 0.067 20.100 50.100 3 0.100 3
0.100 5
0.800 500.267 33 0.133 170.100 3 0.100 7
1.000 500.500 25 0.500 25
1.000 500.500 25
0.500 10 0.500 10
0.0500.0250.019 0.006
0.200
0.109 0.146 0.1460.100 0.100
0.2000.050 0.050
0.1000.200 150.025 50
0.100 50SY £k
3.534 170 6.156 332 5.235 368 14.9 870
2006–07
Total
2004–05 2005–06
Resources available
SY £k SY £k SY £k
Clarke-Gayther, Mike 1.00 1.00 1.00Faircloth, Dan 0.50 0.50 0.50Findlay, David 0.10 0.10 0.10HIPPI engineering 0.70 0.70 0.70 Assumed FTEs payable by €464k/2 over 3 years
Letchford, Alan 0.20 0.40 0.40Whitehead, Mark 0.25 0.25 0.25
Long, Ken 0.10 0.10 0.10Joint IC-RAL lecturer 0.20 0.40 0.40 50% on RAL work starting Oct-04
Post-doc. (IC) 0.25 1.00 1.00Half a post-doc. (IC) 0.50 0.50Mechanical engineer (IC) 0.25 0.75 0.75RF/Electrical engineer (IC) 0.75 0.75Half a post-doc. (Warwick) 0.25 0.25
3.55 6.70 6.70ASTeC/CCLRC 200 300 400 Hope to get more money as time goes on
Cf. 3.53 170 6.16 332 5.24 368 Requirements from first sheet
Additional resources available for these three years and beyondItem WorthDanfysik arc driver 12 Total of £49k (in three orders) for four
Bruker pulser 50Selection of 500 l/s TMPs 50 Bought ~2 years ago
Stand 5Gas scatt. spectr. 25Magnetic spectr. 251 pair emittance scanners 35 3 pairs cost £105k
Data acq. for emitt. scan. 15 Reasonable guess
Odds and ends 33250
2004–05 2005–06 2006–07
1414
At end of three years, i.e. by March 2007, expect to have
Dedicated area (in R8 (probably))Lead shed (shield against RFQ X-rays)Support structure / StandsOperational ~60 mA ion source availableLEBT assembledDesign for RFQSpecification for RF driverProven electrical design for beam chopperDesign for quadrupoles and cavities for chopperSpecification of diagnostics
2020
Also have hardware available for subsequent three years
Danfysik arc driver 12Bruker pulser 50Selection of 500 l/s TMPs 50Stand 5Gas scatt. spectr. 25Magnetic spectr. 251 pair emittance scanners 35Data acq. for emitt. scan. 15Odds and ends 33
250
Area in R8 is well providedSpace, electricity, water, air, crane, loading bay, on ISIS controls circuit, …
2121
2004–2007
Overall scheme, design, infrastructure, specifications, some hardware
£2–2½M
2007–2010
Complete scheme
£5M more — but would have world-class facility
[End]
RAL beam chopper design
Robust design with explicit provision for high power beam collection
Slow transmission line
Lumped line — thermally hardened
0
1
0
12 ns 8
ns
Up to 100 µs