Abstracts Brochure - CERN

THPLS — Poster Session 29-Jun-06 16:00 - 18:00
Radiation Dose Related to ANKA Operation Mode
Radiation doses in the ANKA hall are
measured by area monitoring and Albedo
dosimeters. In August 2004 the machine optics
was replaced by a new optics with re-
I. Birkel, MH. Hagelstein, E. Huttel, A.-S. Müller, P. Wesolowski
(FZK)
duced emittance and higher brightness. Measurements of the beam lifetime and the related radiation doses show a
strong correlation between the operation mode of the machine and the dose distribution in the hall.
Wake Computations for the Beam Positioning Monitors of PETRA III
At DESY it is planned to convert the PE-
TRA ring into a synchrotron radiation facility,
called PETRA III, in 2007. For proper
design of PETRA III it is very important to
A.K. Bandyopadhyay, A. Joestingmeier, A.S. Omar (Otto-Von-Guericke
University) K. Balewski, R. Wanzenberg (DESY)
estimate the wakes due to various discontinuities along the beam pipe. This article is on the wake computations
for the beam positioning monitors (BPMs) in the PETRA III beam pipe. Two computer codes, namely MAFIA and
Microwave Studio, were used for the electromagnetic field computations. Convergence tests and the agreement
between the results of both softwares were taken as criteria in order to validate the results.
Controlling the Vertical Emittance Coupling in CAMD
The vertical beam size in the CAMD Light
Source, as measured with an x-ray pinhole
camera, indicates an emittance coupling ratio
of 3%. This is consistent with the coupling
V.P. Suller (CCLRC/DL/ASTeC) M.G. Fedurin, P. Jines, D.J.
Launey, T.A. Miller, Y. Wang (LSU/CAMD)
ratio as measured by the betatron tune split when the coupling resonance is fully engaged. It has been shown that the
coupling is mainly produced in the 7T wiggler, which is known to produce non-linear fields. To correct this coupling,
it is proposed to install up to four skew quadrupoles. The results of testing a prototype skew quadrupole in the lattice
are presented. It is shown that the coupling will be substantially corrected by suitably distributing and powering the
four skew quadrupoles.
Diamond Light Source Vacuum System Commissioning
Diamond Light Source is a new 3 GeV light
source currently being commissioned in the
UK. The main vacuum systems are a 561.6
m circumference electron storage ring and a
M.P. Cox, B. Boussier, S. Bryan, B.F. Macdonald, H.S. Shiers (Diamond)
158.4 m circumference booster ring. The storage ring target operating pressure is 1·10 -9 mbar with 300 mA of stored
beam after 100 A.h of beam conditioning. The booster ring target operating pressure is up to an order of a magnitude
higher. Pumping is provided by discrete noble diode ion pumps, supplemented by titanium sublimation pumps and
NEG cartridge pumps. Vacuum vessel construction is mainly from 316LN stainless steel. There is no in situ bakeout
except for the 24 storage ring straights and the front ends. An ex situ bakeout process is used for the storage ring
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