Paper |
Title |
Page |
TUPME047 |
Sub-Harmonic Bunching System of CLIC Drive Beam Injector |
1670 |
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- S. Sanaye Hajari, S. Döbert, S. Döbert, H. Shaker
CERN, Geneva, Switzerland
- S. Sanaye Hajari, H. Shaker
IPM, Tehran, Iran
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In the Compact Linear Collider (CLIC) the RF power for the acceleration of the Main Beam is extracted from a high-current Drive Beam that runs parallel with the main linac. The sub-harmonic bunching system of the drive beam injector has been studied in detail and optimized. The model consists of a thermionic gun, three travelling wave sub-harmonic bunchers followed by a tapered travelling wave buncher. The simulation of the beam dynamics has been carried out with PARMELA with the goal of optimizing the overall bunching process and in particular capturing particles as much as possible in the buncher acceptance and decreasing the satellite population.
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TUPME052 |
Sub-harmonic Buncher Design for the CLIC Drive Beam Injector |
1685 |
|
- H. Shaker, S. Döbert, R. Leuxe, S. Sanaye Hajari
CERN, Geneva, Switzerland
- L. Dassa
Università di Brescia, Brescia, Italy
- S. Sanaye Hajari, H. Shaker
IPM, Tehran, Iran
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The CLIC (Compact LInear Collider) is based on two beam concept where a high current drive beam provides the energy needed for acceleration of the main beam. The CLIC drive beam accelerator starts with a high current injector using a sophisticated sub-harmonic bunching system. This paper will focus on the design of the Sub Harmonic Bunchers (SHBs) the first RF components of the injector. A backward traveling wave structure has been optimized for this task. It will be shown also how to avoid asymmetrical fields inside the coupler cells and how to compensate beam loading by changing the phase velocity in comparison to the beam velocity.
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TUPME053 |
General Beam Loading Compensation in a Traveling Wave Structure |
1688 |
|
- H. Shaker, S. Döbert
CERN, Geneva, Switzerland
- H. Shaker
IPM, Tehran, Iran
|
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The well-known beam loading in a traveling wave structure is in fact a resistive beam loading which bunches travel on the crest. This type of beam loading could be compensated by increasing RF feed power. But generally, bunches could travel on each phase. General beam loading compensation is well-known for a single cell cavity and it is done by changing the RF feed power and detuning the structure together. In this paper, the concept of detuning for a TW structure will be shown and the evolution of fundamental mode beam-induced field will be derived and finally, it will be shown how to compensate beam loading by changing the phase velocity in comparison to the beam velocity.
|
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|
TUPME052 |
Sub-harmonic Buncher Design for the CLIC Drive Beam Injector |
1685 |
|
- H. Shaker, S. Döbert, R. Leuxe, S. Sanaye Hajari
CERN, Geneva, Switzerland
- L. Dassa
Università di Brescia, Brescia, Italy
- S. Sanaye Hajari, H. Shaker
IPM, Tehran, Iran
|
|
|
The CLIC (Compact LInear Collider) is based on two beam concept where a high current drive beam provides the energy needed for acceleration of the main beam. The CLIC drive beam accelerator starts with a high current injector using a sophisticated sub-harmonic bunching system. This paper will focus on the design of the Sub Harmonic Bunchers (SHBs) the first RF components of the injector. A backward traveling wave structure has been optimized for this task. It will be shown also how to avoid asymmetrical fields inside the coupler cells and how to compensate beam loading by changing the phase velocity in comparison to the beam velocity.
|
|
|
TUPME053 |
General Beam Loading Compensation in a Traveling Wave Structure |
1688 |
|
- H. Shaker, S. Döbert
CERN, Geneva, Switzerland
- H. Shaker
IPM, Tehran, Iran
|
|
|
The well-known beam loading in a traveling wave structure is in fact a resistive beam loading which bunches travel on the crest. This type of beam loading could be compensated by increasing RF feed power. But generally, bunches could travel on each phase. General beam loading compensation is well-known for a single cell cavity and it is done by changing the RF feed power and detuning the structure together. In this paper, the concept of detuning for a TW structure will be shown and the evolution of fundamental mode beam-induced field will be derived and finally, it will be shown how to compensate beam loading by changing the phase velocity in comparison to the beam velocity.
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|
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