IBIC2013 - List of Authors (Shea, T.J.)

Paper	Title	Page
TUPC01	Overview of the European Spallation Source Warm Linac Beam Instrumentation	346
	B. Cheymol, C. Böhme, I. Dolenc Kittelmann, H. Hassanzadegan, A. Jansson, T.J. Shea, L. Tchelidze ESS, Lund, Sweden
	The normal conducting front end of the European Spallation source will accelerate the beam coming for the ion source up to 90 MeV. The ESS front end will consist in an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line and a drift tube linac. The warm linac will be equipped with beam diagnostics to measure the beam position, the transverse and longitudinal profile as well as beam current and beam losses. This will provide efficient operation of ESS, and ensure keeping the losses at a low level. This paper gives an overview of the beam diagnostics design and their main features.

TUPC02	Proton Beam Measurement Strategy for the 5 MW European Spallation Source Target	349
	T.J. Shea, C. Böhme, B. Cheymol, H. Hassanzadegan, E.J. Pitcher ESS, Lund, Sweden S.D. Gallimore STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom H.D. Thomsen ISA, Aarhus, Denmark
	Approaching construction phase in Lund, Sweden, the European Spallation Source (ESS) consists of a superconducting linear accelerator that delivers a 2 GeV, 5 MW proton beam to a rotating tungsten target. As a long pulse neutron source, the ESS does not require an accumulator ring, so the 2.86 ms pulses, with repetition rate of 14 Hz arrive directly from the linear accelerator with low emittance. To avoid damage to target station components, this intense beam must be actively expanded by quadrupoles that produce a centimetre size beamlet, combined with a fast rastering system that paints the beamlet into a 160 mm by 60 mm footprint. Upstream of and within the target station, a suite of devices will measure the beam's density, halo, position, current, and time-of-arrival. Online density measurements are particularly important for machine protection, but present significant challenges. Diverse techniques will provide this measurement within the target station, based upon secondary emission grids, ionisation monitors, luminescent coatings, and Helium gas luminescence. Requirements, system descriptions, and performance estimates will be presented.

WEPF10	Wire Scanner Design for the European Spallation Source	830
	B. Cheymol, A. Jansson, T.J. Shea ESS, Lund, Sweden
	The European Spallation Source (ESS), to be built in the south of Sweden, will use a 2 GeV superconducting LINAC to produce the world's most powerful neutron source with a beam power of 5 MW. The beam power is a challenge for interceptive beam diagnostics like wire scanner, the thermal load on intercepting devices implies to reduce the beam power in order to preserve the device integrity. For nominal operation, non-disturbing techniques for profile measurements are planned, while for the commissioning phase, accurate measurements and cross checking, wire scanners will be used. This paper describes the preliminary design of the wire scanner system in the normal conducing LINAC as well as in the superconducting LINAC.

Paper

Title

Page

Overview of the European Spallation Source Warm Linac Beam Instrumentation

346

B. Cheymol, C. Böhme, I. Dolenc Kittelmann, H. Hassanzadegan, A. Jansson, T.J. Shea, L. Tchelidze
ESS, Lund, Sweden

The normal conducting front end of the European Spallation source will accelerate the beam coming for the ion source up to 90 MeV. The ESS front end will consist in an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line and a drift tube linac. The warm linac will be equipped with beam diagnostics to measure the beam position, the transverse and longitudinal profile as well as beam current and beam losses. This will provide efficient operation of ESS, and ensure keeping the losses at a low level. This paper gives an overview of the beam diagnostics design and their main features.

TUPC02

Proton Beam Measurement Strategy for the 5 MW European Spallation Source Target

349

T.J. Shea, C. Böhme, B. Cheymol, H. Hassanzadegan, E.J. Pitcher
ESS, Lund, Sweden
S.D. Gallimore
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
H.D. Thomsen
ISA, Aarhus, Denmark

Approaching construction phase in Lund, Sweden, the European Spallation Source (ESS) consists of a superconducting linear accelerator that delivers a 2 GeV, 5 MW proton beam to a rotating tungsten target. As a long pulse neutron source, the ESS does not require an accumulator ring, so the 2.86 ms pulses, with repetition rate of 14 Hz arrive directly from the linear accelerator with low emittance. To avoid damage to target station components, this intense beam must be actively expanded by quadrupoles that produce a centimetre size beamlet, combined with a fast rastering system that paints the beamlet into a 160 mm by 60 mm footprint. Upstream of and within the target station, a suite of devices will measure the beam's density, halo, position, current, and time-of-arrival. Online density measurements are particularly important for machine protection, but present significant challenges. Diverse techniques will provide this measurement within the target station, based upon secondary emission grids, ionisation monitors, luminescent coatings, and Helium gas luminescence. Requirements, system descriptions, and performance estimates will be presented.

WEPF10

Wire Scanner Design for the European Spallation Source

830

B. Cheymol, A. Jansson, T.J. Shea
ESS, Lund, Sweden

The European Spallation Source (ESS), to be built in the south of Sweden, will use a 2 GeV superconducting LINAC to produce the world's most powerful neutron source with a beam power of 5 MW. The beam power is a challenge for interceptive beam diagnostics like wire scanner, the thermal load on intercepting devices implies to reduce the beam power in order to preserve the device integrity. For nominal operation, non-disturbing techniques for profile measurements are planned, while for the commissioning phase, accurate measurements and cross checking, wire scanners will be used. This paper describes the preliminary design of the wire scanner system in the normal conducing LINAC as well as in the superconducting LINAC.