IBIC2013 - List of Authors (Cullinan, F.J.)

Paper

Title

Page

Cavity Beam Position Monitor System for ATF2

120

S.T. Boogert
Royal Holloway, University of London, Surrey, United Kingdom
S.T. Boogert, F.J. Cullinan, Y.I. Kim, A. Lyapin, J. Snuverink
JAI, Egham, Surrey, United Kingdom
T. Tauchi, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan
G.R. White
SLAC, Menlo Park, California, USA

The Accelerator Test Facility 2 (ATF2) in KEK, Japan, is a prototype scaled demonstrator system for the final focus required for a future high energy lepton linear collider. The ATF2 beam-line is instrumented with a total of 38 C- and S- band resonant cavity beam position monitors (CBPM) with associated mixer electronics and digitizers. The current status of the BPM system is described, including a study of the CBPM performance over a three week period, including systematic effects such as charge, bunch length and beam offset dependence. The BPM system is routinely used for beam based alignment, wakefield kick measurements and dispersion measurements, the operational experience and example measurements are also reported.

TUPC19

First Beam Tests of a Prototype Cavity Beam Position Monitor for the CLIC Main Beam

411

F.J. Cullinan, S.T. Boogert, A. Lyapin, J.R. Towler
JAI, Egham, Surrey, United Kingdom
W. Farabolini, T. Lefèvre, L. Søby, M. Wendt
CERN, Geneva, Switzerland

Beam position monitors (BPMs) throughout the CLIC (Compact Linear Collider) main linac and beam delivery system must routinely operate at 50 nm resolution and be able to make multiple position measurements within a single 156 ns long bunch train. A prototype cavity beam position monitor, designed to demonstrate this performance, has been tested on the probe beamline of CTF3 (the CLIC Test Facility). Sensitivity measurements of the dipole mode position cavity and of the monopole mode reference cavity have been made. The characteristics of signals from short and long bunch trains and the dominant systematic effects have also been studied.

TUPC20

Technologies and R&D for a High Resolution Cavity BPM for the CLIC Main Beam

415

J.R. Towler, T. Lefèvre, L. Søby, M. Wendt
CERN, Geneva, Switzerland
S.T. Boogert, F.J. Cullinan, A. Lyapin
JAI, Egham, Surrey, United Kingdom

The Main Beam (MB) LINAC of the Compact Linear Collider (CLIC) requires a beam orbit measurement system with a high spatial (50 nm) and high temporal (50 ns) resolution to resolve the beam position within the 156 ns long bunch train, traveling on an energy-chirped, minimum dispersive trajectory. A 15 GHz prototype cavity BPM has been commissioned in the probe beam-line of the CTF3 CLIC Test Facility. The performance and technical details of this prototype installation are discussed in this paper, including the 15 GHz analog down-converter, the data acquisition and the control electronics and software. An R&D outlook is given for the next steps, which requires a system of 3 cavity BPMs to investigate the full resolution potential.

FRWAJ5

CBPM Waveform Deconvolution

F.J. Cullinan
JAI, Egham, Surrey, United Kingdom

Francis presented simulations on the deconvolution of the cavity BPM response to a single bunch from signals obtained for a bunch train stimulus, based on the CTF3 beam parameters. In this case the bunch spacing is always short compared to the decay time τ of the BPM resonator. He tried to resolve individual bunches by the deconvolution method. Applying a random position jitter along the bunch train, he compared a simple downconversion procedure and a combination of downconversion and deconvolution to the original beam position. The DDC/deconvolution method seems to better resolve the beam position along the bunch train. He finally presented his method on measured ATF2 data.

Slides FRWAJ5 [0.217 MB]

Paper	Title	Page
MOPC27	Cavity Beam Position Monitor System for ATF2	120
	S.T. Boogert Royal Holloway, University of London, Surrey, United Kingdom S.T. Boogert, F.J. Cullinan, Y.I. Kim, A. Lyapin, J. Snuverink JAI, Egham, Surrey, United Kingdom T. Tauchi, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan G.R. White SLAC, Menlo Park, California, USA
	The Accelerator Test Facility 2 (ATF2) in KEK, Japan, is a prototype scaled demonstrator system for the final focus required for a future high energy lepton linear collider. The ATF2 beam-line is instrumented with a total of 38 C- and S- band resonant cavity beam position monitors (CBPM) with associated mixer electronics and digitizers. The current status of the BPM system is described, including a study of the CBPM performance over a three week period, including systematic effects such as charge, bunch length and beam offset dependence. The BPM system is routinely used for beam based alignment, wakefield kick measurements and dispersion measurements, the operational experience and example measurements are also reported.

TUPC19	First Beam Tests of a Prototype Cavity Beam Position Monitor for the CLIC Main Beam	411
	F.J. Cullinan, S.T. Boogert, A. Lyapin, J.R. Towler JAI, Egham, Surrey, United Kingdom W. Farabolini, T. Lefèvre, L. Søby, M. Wendt CERN, Geneva, Switzerland
	Beam position monitors (BPMs) throughout the CLIC (Compact Linear Collider) main linac and beam delivery system must routinely operate at 50 nm resolution and be able to make multiple position measurements within a single 156 ns long bunch train. A prototype cavity beam position monitor, designed to demonstrate this performance, has been tested on the probe beamline of CTF3 (the CLIC Test Facility). Sensitivity measurements of the dipole mode position cavity and of the monopole mode reference cavity have been made. The characteristics of signals from short and long bunch trains and the dominant systematic effects have also been studied.

TUPC20	Technologies and R&D for a High Resolution Cavity BPM for the CLIC Main Beam	415
	J.R. Towler, T. Lefèvre, L. Søby, M. Wendt CERN, Geneva, Switzerland S.T. Boogert, F.J. Cullinan, A. Lyapin JAI, Egham, Surrey, United Kingdom
	The Main Beam (MB) LINAC of the Compact Linear Collider (CLIC) requires a beam orbit measurement system with a high spatial (50 nm) and high temporal (50 ns) resolution to resolve the beam position within the 156 ns long bunch train, traveling on an energy-chirped, minimum dispersive trajectory. A 15 GHz prototype cavity BPM has been commissioned in the probe beam-line of the CTF3 CLIC Test Facility. The performance and technical details of this prototype installation are discussed in this paper, including the 15 GHz analog down-converter, the data acquisition and the control electronics and software. An R&D outlook is given for the next steps, which requires a system of 3 cavity BPMs to investigate the full resolution potential.

FRWAJ5	CBPM Waveform Deconvolution
	F.J. Cullinan JAI, Egham, Surrey, United Kingdom
	Francis presented simulations on the deconvolution of the cavity BPM response to a single bunch from signals obtained for a bunch train stimulus, based on the CTF3 beam parameters. In this case the bunch spacing is always short compared to the decay time τ of the BPM resonator. He tried to resolve individual bunches by the deconvolution method. Applying a random position jitter along the bunch train, he compared a simple downconversion procedure and a combination of downconversion and deconvolution to the original beam position. The DDC/deconvolution method seems to better resolve the beam position along the bunch train. He finally presented his method on measured ATF2 data.
	Slides FRWAJ5 [0.217 MB]