Abstracts Brochure - CERN

THPLS033
THPLS034
29-Jun-06 16:00 - 18:00 THPLS — Poster Session
layered approach. The main layers provide a set of different views or abstractions of the underlying accelerator:
field layer, machine layer, and optics layer. The field layer handles all the access and communications with the
actual devices of the accelerator, e.g., power supplies, instrumentation, etc. The machine layer handles the machine
layout description, functional constraints like the association of a string of magnets with one power supply, and the
conversion from actual values acquired from the field into values meaningful to beam dynamics problems. The optics
layer performs all the actual calculations concerning the beam like beta functions, damping times, etc. An important
characteristic of the new library is the unified management of all the needed calibrations and configurations by means
of a relational database.
*“Elettra New Full Energy Injector Status Report”, these proceedings.
Elettra New Full Energy Injector Status Report
M. Svandrlik, S. Bassanese, F.C. Cargnello, A. Carniel, K. Casarin, P.
Craievich, G. D’Auria, R. De Monte, S. Di Mitri, A. Fabris, R. Fabris,
M. Ferianis, A. Gambitta, F. Giacuzzo, F. Iazzourene, G.L. Loda,
M. Lonza, F.M. Mazzolini, D.M. Morelli, G. Pangon, C. Pasotti, G.
Penco, L.P. Pivetta, L. Rumiz, C. Scafuri, G. Tromba, A. Vascotto, R.
Visintini, D. Zangrando (ELETTRA)
456
The Elettra new full energy injector will be
based on a 100 MeV linac pre-injector, a 2.5
GeV booster synchrotron and two new beam
transfer lines. It will replace the existing
1.2 GeV linac injector and transfer line. Full
funding was finally available in 2005, which
allowed to start, or in some cases to re-start,
the construction activities. The status of the
project will be presented in this paper, in particular the progress of the fabrication of various components, like
magnets, power supplies, vacuum chambers; also the status of the construction of the building and technical plants
will be given. Results of recent optimization studies will also be outlined. The commissioning of the new injector is
scheduled to start in Spring 2007, while the first ELETTRA operation for user’s with the new full energy injector is
expected for the last quarter of 2007.
Top-up Operation of SPring-8 Storage Ring with Low Emittance Optics
H. Tanaka, N. Kumagai, M. Masaki, S. Matsui, H. Ohkuma, T.
Ohshima, M. Oishi, J. Schimizu, K. Soutome, S. Takano, M. Takao,
H. Takebe, K. Tsumaki, H. Yonehara, T. Yorita, C. Zhang (JASRI/
SPring-8)
We have succeeded in providing stable and
three-times more brilliant x-ray to users by
combining top-up operation with low emittance
optics. The optics with the low emittance
of 3nmrad was first applied to the user
operation in November 2002. Although the
low emittance provided the brilliant x-ray, the extremely short beam lifetime much disturbed the precise experiments.
Moreover, the aborted electron beam damaged the part of vacuum chamber at the beam injection section. The low
emittance operation was thus suspended in October 2003. By improving design of the vacuum chamber and introducing
the top-up injection, the problems for the stable operation were resolved, and then the top-up operation with
the low emittance optics has been first achieved at SPring-8. This paper illustrates how we achieved this sophisticated
operation by explaining the following three essential investigations: (1) reduction of natural emittance for a storage
ring with four magnet-free long straight sections, (2) protection of vacuum chamber from aborted electron beam, and
(3) consistency to the top-up operation. The obtained performance is also described in the paper.