Abstracts Brochure - CERN

TUPCH — Poster Session 27-Jun-06 16:00 - 18:00
Very Small Beam Size Measurement by Reflective SR Interferometer at KEK-ATF
An SR interferometer with the Herschelian
reflective optics has been developed for the T. Naito, T. Mitsuhashi (KEK)
measurement of several um beam size. The
chromatic aberration of the optical system applied in the SR interferometer limits the resolution of SR interferometer.
We used objective lens of the SR interferometer by a focusing mirror. For the convenience of observation of the
interferogram, we applied Herschelian arrangement of the optics. The measured vertical beam size was less than
5um and the estimated vertical emittance was 1x10-11m at the KEK-ATF damping ring.
Dual Mode Beam Current Monitor
A new type HEREWARD-transformer is developed.
The original scheme connects
pickup coil to the low impedance input of
the amplifier to increase the time constant of
S. Ninomiya, T. Adachi, S. Fukumoto (KEK) S.H. Hatori, T. Kurita
(WERC)
the transformer. The new scheme employs negative impedance circuit which realizes perfect cancellation of the coil
resistance. Therefore DC component of the beam current can be observed. Since number of winding of the pick up
coil is only 100-turns, therefore by using the original scheme with a fast operational amplifier, the transformer can
be operated at fast CT mode. Thus the dual mode operation can be realized by single core; the first mode is the
slow beam intensity monitor, and the second is a fast response transformer. This operation mode realizes an accurate
observation of the beam injection process. In order to make installation easy, the core is divided into two pieces.
The magnetic shield from bending field is also installed. This monitor is developed at KEK, and installed into the
accelerator at the WAKASA WAN Energy Research Center.
Beam Collimator System in the J-PARC 3-50BT Line
For the J-PARC 50 GeV Main Ring Synchrotron
(MR), the design beam emittance is 54 M.J. Shirakata, H. Oki, T. Oogoe, Y. Takeuchi, M. Yoshioka (KEK)
pi mm mrad. On the other hand, the 3 GeV
beam from the Rapid Cycling Booster Synchrotron (RCS) may have a large halo component upto 216 pi mm mrad.
In order to absorb the halo component, a beam collimator system will be installed in the beam transport line called
as the 3-50BT, which connects the RCS and the MR. From the view of the hands-on maintenance, high endurance
structure is adopted. The beam collimator design including the beam optics is reported in this paper.
Installation of Beam Monitor Sensors in the LINAC Section of J-PARC
In the LINAC section of J-PARC, we have several
type of sensors of monitor, i.e, Beam Position
Monitor, Beam Profile Monitor, Beam
Size Monitor, Current Monitor, Beam Phase
S. Sato, H. Ao, T. Tomisawa, A. Ueno (JAEA/LINAC) H. Akikawa
(JAEA) Z. Igarashi, S. Lee (KEK)
Monitor, Beam Loss Monitor. Those sensors are being installed currently. The procedures, remarks during the installation,
status are described in this paper. As an examle, the beam postion monitors are one of sensors which are taken
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