Design and Characterisation of the Focusing Solenoidal System for the CLARA High Repetition Rate Electron Source

Scott, Duncan; Bainbridge, Alexander; Cash, Ryan; Edmonds, Christopher; Jones, Thomas; Marinov, Kiril; Militsyn, Boris; Shepherd, Ben

doi:10.18429/JACoW-IPAC2017-THPIK107

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RIS citation export for THPIK107: Design and Characterisation of the Focusing Solenoidal System for the CLARA High Repetition Rate Electron Source

TY - CONF
AU - Scott, D.J.
AU - Bainbridge, A.R.
AU - Cash, R.J.
AU - Edmonds, C.S.
AU - Jones, T.J.
AU - Marinov, K.B.
AU - Militsyn, B.L.
AU - Shepherd, B.J.A.
ED - Schaa, Volker RW
ED - Arduini, Gianluigi
ED - Pranke, Juliana
ED - Seidel, Mike
ED - Lindroos, Mats
TI - Design and Characterisation of the Focusing Solenoidal System for the CLARA High Repetition Rate Electron Source
J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017
C1 - Copenhagen, Denmark
T2 - International Particle Accelerator Conference
T3 - 8
LA - english
AB - One of the critical components of electron injectors based on RF photoelectron sources is the focusing system. The system typically consists of a Main Focusing Solenoid and a Bucking Coil. Combination of these two solenoids should provide proper focusing of the beam at the exit of the RF cavity and zero longitudinal magnetic field in the photocathode plane to minimise the beam emittance. Imperfection of the solenoid design, manufacturing and alignment frequently leads to asymmetry of the focusing field which has to be compensated with additional coils. In order to eliminate mechanical and magnetic misalignment the CLARA photoinjector solenoids are mounted on one integrated bench and before installation into the beamline have been aligned in the magnet laboratory with simultaneous measurement of the magnetic field. In order to define multipole field components, dedicated measurements of the transverse magnetic field have been done. The amplitudes of the multipoles have been obtained from analysis of the transverse field map. We present here the results of field characterisation.
PB - JACoW
CP - Geneva, Switzerland
SP - 4346
EP - 4348
KW - solenoid
KW - multipole
KW - simulation
KW - alignment
KW - cathode
DA - 2017/05
PY - 2017
SN - 978-3-95450-182-3
DO - 10.18429/JACoW-IPAC2017-THPIK107
UR - http://jacow.org/ipac2017/papers/thpik107.pdf
ER -