IPAC2012 - List of Authors (Skowronski, P.K.)

Paper	Title	Page
TUPPR019	High Power Operation with Beam of a CLIC PETS Equipped with ON/OFF Mechanism	1852
	I. Syratchev, R. Corsini, A. Dubrovskiy, P. Skowroński CERN, Geneva, Switzerland R.J.M.Y. Ruber Uppsala University, Uppsala, Sweden
	One of the feasibility issues of the CLIC two-beam scheme is the possibility of rapidly switching off the RF power production in individual Power Extraction and Transfer Structures (PETS) in case of breakdowns, either in the PETS or one of the main beam accelerating structures. The proposed solution is to use a variable external reflector connected to the PETS. When activated, this scheme allows us to manipulate gradually the RF power transfer to the accelerating structure and to reduce the RF power production in the PETS itself by a factor of 4. Recently the first operation of the Two Beam Test Stand (TBTS) PETS equipped with an on-off mechanism has been performed in CTF3. In this paper we will present the results of the PETS operation when powered by the drive beam up to high peak power levels (>100 MW) and compare them to expectations.

TUPPR032	Beam Stability at CTF3	1888
	T. Persson, P. Skowroński CERN, Geneva, Switzerland
	The two beam acceleration tested in CTF3 imposes very tight tolerances on the drive beam stability. A description of the specialized monitoring tool developed to identify the drifts and jitter in the machine is presented. It compares all the relevant signals in an on-line manner for helping the operator to identify drifts or to log data for off-line analysis. The main sources for the drifts of the drive beam were identified and their causes are described. Feedbacks applied to the RF were implemented to reduce the effects. It works by changing the waveform for the pulse compression to compensate for the drifts.

WEPPP066	Performance Simulations of a Phase Stabilization System Prototype for CTF3	2858
	A. Gerbershagen, T. Persson, D. Schulte, P. Skowroński CERN, Geneva, Switzerland P. Burrows, G.B. Christian Oxford University, Physics Department, Oxford, Oxon, United Kingdom A. Gerbershagen, C. Perry JAI, Oxford, United Kingdom E. Ikarios National Technical University of Athens, Athens, Greece
	The CLIC drive beam provides RF power for acceleration of the main beam, and hence the drive beam’s longitudinal phase tolerances are very tight. A feedforward chicane consisting of four electromagnetic kickers is proposed as a correction system for the phase errors, which should allow loosening of the tolerances. A prototype of such a chicane system, developed by CERN, INFN and the University of Oxford, is planned to be installed at CFT3 in 2012. The present paper summarizes the parameters of the planned phase correction system and presents simulations, which are used to make predictions of the performance of such a feedforward system at CTF3.

Paper

Title

Page

High Power Operation with Beam of a CLIC PETS Equipped with ON/OFF Mechanism

1852

I. Syratchev, R. Corsini, A. Dubrovskiy, P. Skowroński
CERN, Geneva, Switzerland
R.J.M.Y. Ruber
Uppsala University, Uppsala, Sweden

One of the feasibility issues of the CLIC two-beam scheme is the possibility of rapidly switching off the RF power production in individual Power Extraction and Transfer Structures (PETS) in case of breakdowns, either in the PETS or one of the main beam accelerating structures. The proposed solution is to use a variable external reflector connected to the PETS. When activated, this scheme allows us to manipulate gradually the RF power transfer to the accelerating structure and to reduce the RF power production in the PETS itself by a factor of 4. Recently the first operation of the Two Beam Test Stand (TBTS) PETS equipped with an on-off mechanism has been performed in CTF3. In this paper we will present the results of the PETS operation when powered by the drive beam up to high peak power levels (>100 MW) and compare them to expectations.

TUPPR032

Beam Stability at CTF3

1888

T. Persson, P. Skowroński
CERN, Geneva, Switzerland

The two beam acceleration tested in CTF3 imposes very tight tolerances on the drive beam stability. A description of the specialized monitoring tool developed to identify the drifts and jitter in the machine is presented. It compares all the relevant signals in an on-line manner for helping the operator to identify drifts or to log data for off-line analysis. The main sources for the drifts of the drive beam were identified and their causes are described. Feedbacks applied to the RF were implemented to reduce the effects. It works by changing the waveform for the pulse compression to compensate for the drifts.

WEPPP066

Performance Simulations of a Phase Stabilization System Prototype for CTF3

2858

A. Gerbershagen, T. Persson, D. Schulte, P. Skowroński
CERN, Geneva, Switzerland
P. Burrows, G.B. Christian
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
A. Gerbershagen, C. Perry
JAI, Oxford, United Kingdom
E. Ikarios
National Technical University of Athens, Athens, Greece

The CLIC drive beam provides RF power for acceleration of the main beam, and hence the drive beam’s longitudinal phase tolerances are very tight. A feedforward chicane consisting of four electromagnetic kickers is proposed as a correction system for the phase errors, which should allow loosening of the tolerances. A prototype of such a chicane system, developed by CERN, INFN and the University of Oxford, is planned to be installed at CFT3 in 2012. The present paper summarizes the parameters of the planned phase correction system and presents simulations, which are used to make predictions of the performance of such a feedforward system at CTF3.