uknf osc meeting @ ral – 30 st january 2012 uknf - status, high lights, plans j. pozimski

UKNF OsC meeting @ RAL – 30st January 2012

UKNF - Status, high lights, plans

J. Pozimski


WP1 - Major achievements

IDR written, edited and published ECFA review Costing meetings – UKNF leading activity on NF Redesign of Target area for risk mitigation Investigation of particle dynamics in the baseline muon front end lattice and

investigation of the performance of alternative lattices Studies of power deposition in the target and pion capture area due to secondary

radiation Studies of solid and liquidized power jet targets for mercury risk mitigation Multi-particle simulations of the muon linac using field maps, comparison of

gained results from various software packages with good agreement in transversal and longitudinal particle dynamics and particle loss pattern.

Detailed studies of beam injection and extraction into the FFAG, studies of kicker and septum design as well as kicker electronics.

Further studies of FFAG magnets and particle tracking in fieldmaps. Further progress on common proton driver work (ISIS upgrade)


Proton driver status:Bunch Compression

21/04/23 IDS-NF Plenary

Bunch compression simulation performed for RAL 3.2-9.6 GeV RCS

Simulated in ESME – 1D longitudinal code from Fermilab

ESME is simple, fast and has a long history but has weak feedback (RIRO)

Following plots: 500 particles, no space charge

3

UKNF OsC meeting @ RAL – 30st January 201221/04/23 IDS-NF Plenary

RF Waveform – 3.6 MVmax, in 0.01 sec

26.6 ns rms 2.52 ns rms

Simulation using ESME

4


Target station design evolution

Due to the increase field volume the particle capture was increased compared to the old target station, expected to become new baseline layout at IDS meeting in April


Front end design work

Muon Front End baseline description:

Longitudinal driftBuncher

Phase-Energy RotationIonisation Cooling

Risks and mitigations :

Transmission losses and secondary particles -> Chicane

RF break down in magnetic fields ->Bucket coil lattice


Chicane for secondary particle suppression

Heat deposition from secondaries is significant:

Three issues:

Activation of the linac

Heat load on superconductors

Radiation damage

Losses are 2-3 orders of magnitude too high → Mitigation:

Chicane for high momentum particles

Proton absorber for low momentum protons as protons stop quicker than pions/muons inmaterial

Transverse collimation


High power RF in magnetic field

Reduced magnetic field at RF cavities

May enable higheraccelerating voltage

Comparable transmissionFor identical number of cells(but longer footprint)

Increased magnetic field energy (and cost)

Newest results showimproved performance compared to study 2a

Expected to become new baseline in April meeting.

First indication of 6D cooling


Linac and RLAs. Linac and RLA1 design updated following discussions at the Mississippi meeting. Presented updated design at IPAC 2011.

Information has been input into the ADT for the linac.

RLA1 all beam elements designed and ready for costing,

RLA2 requires EM design of magnets (dipoles, QP & sextupoles).

First costing of Linac and RLA’s to be available before

Multiparticle tracking and performance analyses planned for Summer 2012,

Linac & RLA’s


Number of cells 67

Circumference 669 m

RF voltage 1.1956 GV

Max field in F magnet 4.4 T

Max field in D magnet 6.2 T

F magnet radius 11.3 cm

D magnet radius 13.1 cm

Muon decay 7.1 %

Injection energy 12.6 GeV

Extraction energy 25 GeV

0 0.25 0.5 0.75 1 1.25 1.5

14000

16000

18000

20000

22000

24000 [MeV]

time [ns]

High energy acceleration 12.6 -25 GeV (NS-FFAG)

Simulations of accelerationConceptual engineering layout of the NS-FFAG cell

• Lattice design has been updated.• Beam dynamics has been crosschecked using independent codes.• Preliminary magnet design was studied.• Injection/extraction has been designed.• Engineering studies has been initiated.•The principles of NS-FFAG are being tested at EMMA.• Chromaticity correction scenario still to be defined!


Muon Storage Ring work (D. Kelliher, J. Pasternak, C. Prior, Su Wan, Norbert

Collomb, Neil Bliss, A. Kurup)(July 2011 – December 2011)

Established injection scheme into the production straight with achievable septum and kicker strengths. (D.K.)

Identified injection timing problem - Kicker rise/fall time could be challenging with <500ns between bunches. (C.P., D.K.)

Document to allow costing of ring put together using accelerator design tool. (D.K, A.K.)

Design of insertion into arc to ease injection. (J.P, S.Y)

10 GeV design for LENF (J.P., S.Y)

Preliminary work for tunnel layout – consideration of module installation, access shafts, health & safety legislation, services etc (N.C., N.B)


Costing exercise

Costing of the Accelerator complex. Detailed definition of the breakdown structure for the whole facility. Development of the Accelerator Design Tool (ADT). Spreadsheet to

store the physics design and the costing information in the same format.

Development of macros for the ADT Translation macros needed to upload the information in the

format required by the CERN costing tool.

Macros to produce MADX and G4beamline input files to verify information in the ADT and feedback engineering considerations to accelerator physicists.


FETS Status

• Ion source operates at nearly design specs (2 ms, 50 mA) but persisting problems with heater electronics and spare parts• LEBT characterization nearly complete, but origin ofresidual source misalignment still unknown • Beam at injection into RFQ ~ 0.3-0.35 pimmmrad (measured)• Detailed study of influence of RFQ modulation on field flatness

finished and RFQ design adjusted.• RFQ manufacture started• Unitil 31 March, 1st section manufactured, section 2-4 roughing stage

finished• Preliminary cost estimate for manufacture 160-200 k£ - 6 month• Still expecting circulator to be delivered, high power RF distribution

ordered, setup to be finalized until summer• Work focus shifted towards MEBT.


The FETS ion source can deliver 60 mA H– to the RFQ @1 ms 50 Hz or @2 ms 25 Hz

Normalised rms emittances: H 0.49 πmm.mRadV 0.29 πmm.mRad

Focus now on ion source plasma investigations. First spectroscopic analyses finished, and further activities in collaboration with CERN and university of Jyväskylä (UV spectroscopy).

Dan Faircloth, Scott Lawrie, ISIS


Emittances for 50 mA beam calculated for

experimental parameters using GPT

LEBT Experimental ResultsComparison of emittance measurements with

simulations

Transverse emittances for 50 mA beam measured in

diagnostics vessel

J. Back Warwick


The machine shown is typical of the type of machine required to produce the RFQ. Large, rigid and precise – not a combination that many manufacturers invest in.

RFQ Manufacture


RFQ Manufacture

NAB Precision Engineering Ltd machined the outer face of one major vane block flat and then machined one roughing pass of the internal vane profile maintaining a distance of at least 10mm from the finished profile.

This was done to assess the deformation due to the internal stresses that are induced during the hot rolling production process.

A sufficient number of roughing passes will be required tuntil the copper is stable to less than the finished tolerances.

This deformation of the outer face was measured after the vane profile machining was performed. The result was a very encouraging 0.10mm.


Stress analyses for assembly procedure

To avoid deformation of RFQ vane pieces in the assembly process a specialCarrier for assembly is made. The projected deformation is far below the tolerances.

Ready for RFQ production - Request of quotes this month, delivery until March 2012.

P. Savage Imperial


High power RF system

Klystron and waterload delivered and tested to 1 MW, circulator expected to be delivered, RF distribution system on order, structural support in preparation.


1. RFQ manufacture2. RFQ ancillaries3. RFQ assembly4. Klystron power delivery5. RGIS6. MEBT Engineering7. Downstream of the MEBT

MEBT Engineering

Who? Ciprian, Mike, Pete

We are planning a three year Engineering program starting April 2012:Year 1: Engineering DesignYear 2: Engineering drawings and preparation for manufacture.Year 3: Manufacture, procurement and installation.

The SNS MEBT shown here gives an idea how the finished FETS MEBT will look.


FETS proposal and Review

PROJECT: FETS Overview of project costsIssue Date: 24/06/2011

Manager: A. LetchfordStart Date: 2012End Date: 2014

Work package 2012/13 2013/14 2014/15 TotalId Name Fraction £k Fraction £k Fraction £k Fraction £kStaff effort, summary by instituteFront-end test stand

1Front-end test standSTFC-Fellow 0.50 46.58 0.50 48.21 0.50 49.89 1.50 144.67

STFC-ASTEC 1.00 79.88 1.00 82.68 1.00 85.57 3.00 248.13STFC-ISIS 6.30 533.06 5.75 519.92 3.80 364.68 15.85 1417.66

Huddersfield 1.05 6.27 1.05 6.49 1.05 6.72 3.15 19.48Imperial-Physics 5.19 322.25 5.15 335.83 4.55 318.66 14.89 976.74

RHUL 0.50 41.40 0.50 42.85 0.50 44.35 1.50 128.60UCL 0.20 23.12 0.20 23.93 0.10 12.39 0.50 59.44

Warwick 0.35 40.93 0.35 42.37 0.35 43.85 1.05 127.15Staff sub-totals 15.09 1093.49 14.50 1102.27 11.85 926.11 41.44 3121.88Staff totals 15.09 1093.49 14.50 1102.27 11.85 926.11 41.44 3121.88

Non-staff cost summaryFront-end test stand

1Front-end test stand 582.65 523.08 367.79 1473.52Non-staff sub-totals 582.65 523.08 367.79 1473.52Non-staff totals 582.65 523.08 367.79 1473.52

Total staff and non-staff by work packageFront-end test stand

1Front-end test stand 1676.14 1625.35 1293.90 4595.39Sub-totals 1676.14 1625.35 1293.90 4595.39

Grand totals 1676.14 1625.35 1293.90 4595.39

Findings:• FETS is of strategic importance for Proton based research in Europe, e.g. ISIS upgrade, ESS. • Synergies exist with the LHC injector upgrade. • FETS is well aligned with the UK strategy.• FETS is unique in Europe since it is linked with an operating facility and it may directly impact the proposed ISIS upgrade.

Comments:• FETS could become a core piece of a “proton centre”.• Although previously underfunded, which has hampered progress, the present request is well justified. • Contribution from and to other European projects would be easier to align if the standard European Frequency of 352 MHz was

used.Recommendations :

• Fund the completion of FETS as a high priority. • Consider the next stage to be a conceptual layout of a CH linac and prototyping of such

structures.


Summary

The IDR and numerous Publications, invited talks, PhD's, etc. 1 IDS plenary meeting EUROnu Costing workshop EUROnu safety workshop this week Work package meetings and workshops Significant contribution to EMMA commissioning UKNF overall on schedule and budget. Overall good progress on

all fields Momentary focus on RFQ and RF distribution MEBT engineering design started, will intensify as soon as RFQ

is in production CH structure from 3 MeV onwards in first design phase Expecting funding decision for a 3 year period. Strengthen collaborations with ESS, CERN, FNAL.

uknf osc meeting @ ral – 30 st january 2012 uknf - status, high lights, plans j. pozimski

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