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| MOP002 |
Efficient Long-Pulse, Fully Loaded CTF3 Linac Operation
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31 |
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- P. Urschütz, H.-H. Braun, R. Corsini, S. Doebert, E. Jensen, F. Tecker
CERN, Geneva
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An efficient RF to beam energy transfer in the accelerating structures of the drive beam is on of the key points of the Compact Linear Collider (CLIC) RF power source. For this, the structures are fully beam-loaded, i.e. the accelerating gradient is nearly zero at the downstream end of each structure. In this way, about 96% of the RF energy can be transferred to the beam. To demonstrate this mode of operation, 1500 ns long beam pulses are accelerated in six fully loaded structures in the CLIC Test Facility (CTF3) Linac. In the paper we present the results of experimental studies on this mode of operation, compare them with theoretical predictions and discuss its potential use in CLIC.
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| THP077 |
A High-Gradient Test of a 30-GHz Copper Accelerating Structure
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761 |
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- S. Doebert, R. Corsini, R. Fandos, A. Grudiev, E. Jensen, T. Ramsvik, J. A. Rodriguez, J. P.H. Sladen, I. Syratchev, M. Taborelli, F. Tecker, P. Urschütz, I. Wilson, W. Wuensch
CERN, Geneva
- Ö.M. Mete
Ankara University, Faculty of Engineering, Tandogan, Ankara
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The CLIC study is investigating a number of different materials at different frequencies in order to find ways to increase achievable accelerating gradient and to understand what are the important parameters for high-gradient operation. So far a series of rf tests have been made with a set of identical-geometry 30 GHz and X-band structures in copper, tungsten and molybdenum. A new test of a 30 GHz copper accelerating structure has been completed in CTF3 with pulse lengths up to 100 ns. The new results are presented and compared to the previous structures to determine dependencies of quantities such accelerating gradient, material, frequency, pulse length, power flow, conditioning rate, breakdown rate and surface damage.
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| THP078 |
High-Gradient Test of a Tungsten-Iris X-Band Accelerator Structure at NLCTA
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764 |
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- S. Doebert, A. Grudiev, S. T. Heikkinen, J. A. Rodriguez, I. Syratchev, M. Taborelli, W. Wuensch
CERN, Geneva
- C. Adolphsen, L. Laurent
SLAC, Menlo Park, California
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The CLIC study group at CERN has built two X-band accelerating structures to be tested at SLAC in NLCTA. The structures consist of copper cells with insert irises made out of Molybdenum and Tungsten, clamped together and installed in a vacuum tank. These structures are exactly scaled versions from structures tested previously at 30 GHz and with short pulses (16 ns) in the CLIC Test Facility at CERN. At 30 GHz these structures reached gradients of 150 MV/m for Tungsten and 195 MV/m for Molybdenum. These experiments were designed to provide data on the dependence of rf breakdown on pulse length and frequency. This paper reports in particular on the high-gradient test of the tungsten-iris structure. At a pulse length of 16 ns a gradient of 125 MV/m was reached at X-band, 20 % lower than the 150 MV/m measured at 30 GHz in the CLIC Test Facility. The pulse length dependence and the dependence of the break down rate as a function of gradient were measured in detail. The results are compared to data obtained from the Molybdenum-Iris experiment at X-band which took place earlier as well as to 30 GHz data.
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