| Paper |
Title |
Page |
| TH201 |
IOT RF Power Sources for Pulsed and CW Linacs
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574 |
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- H.P. Bohlen
CPI, Palo Alto, California
- Y. Li, R.N. Tornoe
CPI/EIMAC, San Carlos, California
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For many years, klystrons have been the preferred RF power amplifiers for both pulsed and CW linacs at UHF and higher frequencies. Their properties have earned them that position. But in recent years in UHF terrestrial television transmitters the earlier predominant klystron has been replaced the Inductive Output Tube (IOT) because the IOT provides higher efficiency and, due to its excellent linearity, can handle the simultaneous amplification of both the vision and the sound signal. Its robustness and life expectancy equals that of a klystron, and it more than compensates its lower gain by a lower price and a smaller size. For linac operation, derivates of UHF TV IOTs, capable of up to 80 kW CW output power, are already available and operating. In L-Band, they are presently joined by recently developed 15 to 30 kW CW IOTs. HOM-IOTs are expected to extend the CW range in UHF to 1 MW and beyond. Pulsed operation of an IOT can be achieved without a high-voltage modulator. Since the beam current is grid-controlled it is sufficient to pulse the drive power.
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Transparencies
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| TH202 |
Review of Fast Beam Chopping
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578 |
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Several types of fast beam chopping systems in use or under construction are presented. Emphasis is given to their specific technologies and in particular their various fields of application. Important parameters are duty cycle, rise-and falltime, ringing and overall bandwidth. Certain systems have very specific driver concepts since the generation of multi kW peak power with nanosecond transients, high repetition rate and very good pulse shape fidelity is not a trivial issue. The design of driver amplifier and actual chopper structure are not always mutually independent and thus some of the limiting aspects will be discussed.
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Transparencies
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| TH203 |
High Power Targets
|
583 |
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- H. Kirk
BNL, Upton, Long Island, New York
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The accelerator physics community is responding to developing theoretical arguments for the search of new physics beyond the Standard Model by conceiving and proposing new high-intensity proton machines in the multi-megawatt class. These new machines will allow for the production of a variety of useful secondary beams but only if the proper target configurations are first developed and then implemented. In this paper, important target issues will be discussed and world-wide approaches and prospects for new targets will be reviewed.
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Transparencies
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| TH204 |
End-to-End Beam Dynamics Simulations for the ANL-RIA Driver Linac
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584 |
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- P.N. Ostroumov
ANL/Phys, Argonne, Illinois
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The proposed Rare Isotope Accelerator (RIA) Facility consists of a superconducting (SC) 1.4 GV driver linac capable of producing 400 kW beams of any ion from hydrogen to uranium. The driver is configured as an array of ~350 SC cavities, each with independently controllable rf phase. For the end-to-end beam dynamics design and simulation we use a dedicated code, TRACK. The code integrates ion motion through the three-dimensional fields of all elements of the driver linac beginning from the exit of the electron cyclotron resonance (ECR) ion source to the production targets. TRACK has been parallelized and is able to track large number of particles in randomly seeded accelerators with misalignments and a comprehensive set of errors. The simulation starts with multi-component dc ion beams extracted from the ECR. Beam losses are obtained by tracking up to million particles in hundreds of randomly seeded accelerators. To control beam losses a set of collimators is applied in designated areas. The end-to-end simulations with the TRACK code have been extremely useful for studies of different options of the driver linac design with respect to beam quality, beam losses and sensitivity of beam parameters to various types of errors.
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Transparencies
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