Abstracts Brochure - CERN

THPCH — Poster Session 29-Jun-06 16:00 - 18:00
Dark Current Reduction System for the SPring-8 Linac
In the SPring-8 linac, removal of dark currents
generated from an injector part has T. Kobayashi (JASRI/SPring-8)
been studied to enhance the bunch purity
of stored beam in the SPring-8 storage ring. We already succeeded in reduction of the dark currents from a thermionic
electron gun by a beam deflector of parallel plate electrodes. However, dark currents are also generated in accelerating
structures due to the high electric fields. We have been studying removal of the dark currents generated from the first
accelerating structure by solenoid coils covering it.
Control System of the Superconducting Insertion Devices at TLS
There are three superconducting insertion
devices installed at Taiwan Light Source.
Two is under construction. These insertions
enhance hard X-ray production to satisfy the
J. Chen, K.-T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Kuo, D. Lee, C.-J. Wang
(NSRRC)
research requirement of X-ray community. The control system is implemented to support the operation of all these
superconducting insertion devices. The control system coordinate the operation of the main power supply and the
trimming power supply to charge/discharge the magnets and provide essential interlock protection for the coils and
vacuum ducts. Friendly user interface supports routine operation. Various applications are also developed to aid the
operation of these insertion devices. Design consideration and details of the implementation will be summary in this
report.
Present Status of Beam Collimation System of J-PARC RCS
The precedence manufacture of the two
beam collimator was carried out. In these K. Yamamoto (JAEA/J-PARC)
two sets, we tested the heat transfer capacity
of cooling fins and remote clamp handling system. The vertical collimator was able to keep temperature under 120
degrees C by the design heat 400W, but in case of the horizontal collimator, it went over 200 degrees C by the design
heat 700W. The design was changed towards adding an air duct. About remote clamp handling system, it checked
that it could attach by the He leak below 5.*10-10Pa m3/sec as a result of the helium leak examination.
Timing and Laser System for the Tsinghua Thomson Scattering X-ray Source
Research on the Thomson scattering x-ray
source in Tsinghua University has a strict re- Q. Du, H. Chen, W.-H. Huang, C.-X. Tang (TUB)
quirement of timing performance. The rms
jitter between drive laser pulse and RF phase should be less than 250fs; and the arriving time of electron bunch and
terawatt laser pulse should be synchronized within 1ps. Considering the timing issue in modern x-ray facilities, this
paper analyzes jitter sensitivity in photocathode RF gun and describes our timing system together with the picosecond
drive laser system. A synchronization module reduces relative laser-RF timing jitter from several picosecond down
to 200 fs (rms). Based on phase noise modulation theory, a corresponding phase jitter measurement system with
50fs precision is designed and built using phase noise density spectrum analysis technology. Phase noise could be
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