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Abstracts Brochure - CERN

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TUPCH132<br />

TUPCH133<br />

TUPCH134<br />

27-Jun-06 16:00 - 18:00 TUPCH — Poster Session<br />

Higher Order Mode (HOM) Damper of 500MHz Damped Cavity for ASP Storage Ring<br />

J. Watanabe, K. Nakayama, K. S. Sato, H. Suzuki (Toshiba) M. Izawa<br />

(KEK) A. Jackson, G. LeBlanc, K. Zingre (ASP) T. Koseki (RIKEN/<br />

RARF/CC) N. Nakamura, H. Sakai, H. Takaki (ISSP/SRL)<br />

198<br />

TOSHIBA has delivered the storage ring<br />

RF system for the Australian Synchrotron<br />

Project(ASP). Two pairs of the 500MHz<br />

Higher Order Mode(HOM) damped cavities<br />

were applied for this system. Two on-cen-<br />

tered and one off-centered dampers were attached for damping the longitudinal HOM impedance down to less than<br />

20kOhm/GHz. In order to reduce the coupling of off-center damper for accelerating mode and improve cooling<br />

power of damper, New HOM damper was designed by optimizing SiC absorber structure and damper antenna length<br />

using HFSS code. The design and manufacture of the new HOM damper and the test are described.<br />

Comparison of Measured and Calculated Coupling between a Waveguide and an RF Cavity<br />

Using CST Microwave Studio<br />

J. Shi, H. Chen, S. Zheng (TUB) D. Li (LBNL) R.A. Rimmer, H.<br />

Wang (Jefferson Lab)<br />

Accurate predications of RF coupling between<br />

an RF cavity and ports attached to<br />

it have been an important study subject for<br />

years for RF coupler and higher order modes<br />

(HOM) damping design. We report recent progress and a method on the RF coupling simulations between waveguide<br />

ports and RF cavities using CST Microwave Studio in time domain (Transit Solver). Comparisons of the measured<br />

and calculated couplings are presented. The simulated couplings and frequencies agree within ∼ 10% and ∼ 0.1%<br />

with the measurements, respectively. We have simulated couplings with external Qs ranging from ∼ 100 to ∼ 100,<br />

000, and confirmed with measurements. The method should also work well for higher Qs, and can be easily applied<br />

in RF power coupler designs and HOM damping for normal-conducting and superconducting cavities.<br />

RF Characteristics of the PEFP DTL<br />

A conventional 20 MeV Drift Tube Linac<br />

H. S. Kim, Y.-S. Cho, H.-J. Kwon, K.T. Seol (KAERI)<br />

(DTL) for the Proton Engineering Frontier<br />

Project (PEFP) has been developed as a low<br />

energy section of a 100 MeV accelerator. The 20 MeV DTL consists of 4 tanks with 152 cells. The machine has a<br />

unique feature of driving the 4 tanks with a single klystron. Therefore it has several control knobs to compensate the<br />

errors of each tank during operation. To develop the RF control scheme, the variations of the RF parameters of each<br />

tank were measured under various environmental conditions such as wall temperature, cooling water temperature,<br />

and cooling water pressure. In addition, the behaviors of the RF parameters among the tanks were also monitored<br />

during high power operation. In this paper, the measurement results are discussed and the control scheme based on<br />

the results are proposed.

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