Abstracts Brochure - CERN

MOPCH069
MOPCH070
MOPCH071
26-Jun-06 16:00 - 18:00 MOPCH — Poster Session
*R. Geng. Adsorption of Residual Gases in the SRF System for CESR, Proc of the 1999 Part Accel Conf Vol 2, p2317-
2319. **J. Benesch. CEBAF’s SRF cavity manufacturing, IEEE Transactions in Applied Superconductivity, Vol 5, p834
– 836.
Lattice Design for the Fourth Generation Light Source at Daresbury Laboratory
B.D. Muratori, M.A. Bowler, H.L. Owen, S.L. Smith (CCLRC/DL/
ASTeC) S.V. Miginsky (BINP SB RAS)
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The proposed Fourth Generation Light
Source (4GLS) has three electron transport
paths, an energy recovery loop containing
the main linac, IDs and a VUV-FEL, a sepa-
rate branch after the main linac for an XUV-FEL and a transport path for an IR-FEL. The first two present major
challenges in lattice design. The energy recovery loop will be fed by a high average current gun, with bunches of
charge of about 80 pC. High charge (1nC) bunches from a high brightness gun will be accelerated prior to the main
linac and split into the XUV-FEL branch using energy separation after the main linac. We present a lattice design
and results from numerical modelling of the electron bunch transport. The requirements of the machine are short
bunches, a small emittance for both branches and an overall topology which gives a reasonable dimension for the
building. Different transport and compression schemes were assessed to meet these requirements whilst balancing
the disruptive effects of longitudinal and transverse space charge, CSR, wakefields and BBU. Investigations into all of
these instabilities are summarized together with other transport issues and the resulting requirements on all IDs.
The Status of the Daresbury Energy Recovery Prototype Project
S.L. Smith, J.A. Clarke, D.M. Dykes, M.W. Poole (CCLRC/DL/
ASTeC) N. Bliss (CCLRC/DL) E.A. Seddon (CCLRC/DL/SRD)
The major component of the UK’s R&D programme
towards an advanced energy recovery
linac-based light source facility is a 35
MeV technology demonstrator called the en-
ergy recovery linac prototype (ERLP). This is based on a combination of a DC photocathode electron gun, a superconducting
linac operated in energy recovery mode and an IR FEL. The current status of the of this project is presented,
including the construction and commissioning progress and plans for the future exploitation of this scientific and
technical R&D facility.
Optimization of Optics at 200MeV KEK-ERL Test Facility for Suppression of Emittance
Growth Induced by CSR
Energy Recovery Linac (ERL) gets a lot of
M. Shimada, A. Enomoto, T. Suwada, K. Yokoya (KEK)
attention as a next period light source instrument.
To produce high-brightness and short
pulse synchrotoron lights, it is necessary to pass through high current and short bunch electron beams to the insertion
part of ERL with keeping the low emittance and the low energy spread. However, it is challenging because Coherent
Synchrotorn Radiation (CSR) generated at bending magnets is potential sources of the emittance growth which is
enomous especially for high current, short bunch and a low energy beam. Therefore, it is benefit to a gradual bunch
compression in the arc after accelerating the beam up to the full energy. The beam optics and lattice design of 200MeV
ERL Test Facility is optimized to suppress the emittance growth caused by CSR at the arc section on two conditions,