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UK Neutrino Factory WP2 - Proton Driver Front End Progress Report. Alan Letchford. UKNF Meeting, CR12, R68, RAL. 4 th May 2005. H - Ion Source Progress D Faircloth et al, RAL. Separate Penning field Longer discharge pulse Increased output beam current. 1. Separate Penning Field.

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UK Neutrino Factory

WP2 - Proton Driver Front End

Progress Report

Alan Letchford

UKNF Meeting, CR12, R68, RAL. 4th May 2005

h ion source progress d faircloth et al ral
H- Ion Source ProgressD Faircloth et al, RAL
  • Separate Penning field
  • Longer discharge pulse
  • Increased output beam current
variable penning field
Variable Penning Field
  • Allows easier start-up of source
  • Allows the source to operate in “non-standard” conditions
  • Improves arc stability
  • Allows better control of discharge noise
  • High Penning Field slightly increase beam current
2 longer discharge pulse
2. Longer Discharge Pulse

The discharge length has been increased by improving cooling.

1.75 msec achieved so far.

3 increased beam current

70mA beam current

3. Increased beam current

Increasing the beam aperture size gives H- currents up to 70 mA.


Increased aperture has little effect on beam emittance:

0.6 mm aperture width 0.8 mm aperture width


LEBT progress

J Back, Warwick, J Pozimski, Imperial/RAL

  • 3 solenoid magnetic LEBT adopted as baseline design.
  • KV envelope code ENVELPC converted to C++ for initial optimisation studies:
    • Sufficient drift space for pumping and diagnostics
    • ‘Sensible’ solenoids (l < 4 × rbore)of equal length
    • Field ≤ 0.6 T
    • Effective currents up to 10% of actual current due to partial neutralisation

RFQ Progress

A Kurup, Imperial, A Letchford, RAL

  • 324 MHz has been ‘officially’ adopted as the FETS frequency.
  • Choice dictated by ready availability of Toshiba E3740A 3MW pulsed klystron (J-PARC).

Initial investigations of a beam dynamics design at 324 MHz are encouraging.

  • A 3 MeV design giving 95% beam transmission in a 4 m long structure with only 80 kV electrode voltage.
  • The low voltage design means power dissipation is within the capability of the preferred 4-rod type of RFQ.
  • Resurection of the ESS 280 MHz resonator design forms the basis for initial electro-magnetic studies using MAFIA.
  • Integration of mechanical CAD, electromagnetic and thermodynamic codes to produce an integrated design procedure.

Chopper Progress

M Clarke-Gayther, RAL, G Bellodi, F Gerigk, Astec

The phase 2 fast pulser now meets the spec. for rise time, fall time, pulse duration …


… and pulse droop

Phase 1

Phase 2


A complete revision of the FETS chopper line optics has resulted in significant performance gains:

  • Deflection of fast & slow chopper is optically increased by defocusing quadrupoles.
  • More efficient deflection allows shifting the MEBT energy from 2.5 to 3.0 MeV, while using 10% less voltage than in the ESS scheme.
  • Chopped beam from fast & slow chopper is collected in 2 dedicated beam dumps, designed to take full beam power (no need for 2 identical chopper sections).
  • Now only 30% of original plate voltage for the slow chopper is required (6 kV → 2 kV),  faster rise time for slow chopper.
  • Larger apertures for all elements.

Original chopper line

Revised chopper line


Diagnostics Progress

J Pozimski, Imperial/RAL, P Savage, Imperial

A full suite of diagnostics is being to maximise the experimental capabilities of the FETS.

In addition to the usual beam current and emittance measurements, more advanced techniques such as non-destructive laser/optical measurements and residual gas ion spectroscopy are being investigated.


Hugh Rojanski type electrostatic spectrometer

Engineering designs of an HR type electrostatic spectro-meter for the FETS

HR type spectrometer built at IAP Frankfurt



  • Significant progress is being made on the FETS design work with contributions from RAL/ISIS, Astec, Warwick and Imperial.
  • The design is maturing with most of the design issues having been settled.
  • The FETS team is working well with considerable knowledge transfer taking place between the more established and newer members of the team.