Figure 5 - uploaded by Christopher Nantista
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Peak power meter measurements of high power waveforms. The black trace is the input power and the blue trace is the output of the pulse compressor
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Designs for a future X-band linear collider (NLC/GLC) require an rf unit that can produce 450 MW to feed eight 60 cm accelerator structures. The implementation of this rf unit is envisioned to include a dual-moded SLED-II pulse compression system, with a gain of approximately three at a compression ratio of four, followed by an overmoded transmissi...
Context in source publication
Context 1
... final result was a 400 ns flat compressed pulse of X-band rf with peak power exceeding half a gigawatt. The calibrated peak power meter waveforms can be seen in Fig. 5. Calorimetric power measurements were used to confirm the rf calibration. The gain through the dual- moded SLED-II for a compression ratio of four was approximately 3.1 out of an ideal lossless gain of ...
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Citations
... The structure's performance was limited by RF breakdown to about 40 MV/m. A decade later, in 2004, the second generation of RF systems was comprised of dual-mode SLED-II pulse compression and shorter structures, 60-90 cm using solid-state modulators[130],[131], and[132]. This ...
This article attempts to give a historical account and review of technological developments and innovations in radio frequency (RF) systems for particle accelerators. The evolution from electrostatic field to the use of RF voltage suggested by R. Wideröe made it possible to overcome the shortcomings of electrostatic accelerators, which limited the maximum achievable electric field due to voltage breakdown. After an introduction, we will provide reviews of technological developments of RF systems for particle accelerators.
... A design surface field limit of 50 MV/m was chosen based on tests of waveguide and a high-power SLED II prototype [5] [6]. A prototype dual-moded SLED II system for the linear collider was built at NLCTA in 2003 as part of the Eight Pack Project [7]. After high-power processing this system for three weeks, 580 MW, 400 ns pulses were achieved, limited only by the available klystron power. ...
In the mid-1990’ s, groups at SLAC and KEK began dedicated development of X-band (11.4 GHz) rf technology for a next generation, TeV-scale linear collider. The choice of a relatively high frequency, four times that of the SLAC 50 GeV Linac, was motivated by the cost benefits of having lower rf energy per pulse (hence fewer rf sources) and reasonable efficiencies at high gradients (hence shorter linacs). To realize such savings, however, requires operation at gradients and peak powers much higher than that hitherto achieved. During the past twelve years, these challenges were met through innovations on several fronts. This paper reviews these achievements, which include developments in the generation and transport of high power rf, and new insights into high gradient limitations.
... Tests at full power level can be performed at SLAC, the only laboratory where an 11.4 GHz source with a power of 500 MW in 400 nsec pulses is presently available [15]. ...
A phase shifter to be the key element of an active high‐power switch is described. This phase shifter employs ultra‐fast, electrically‐controlled ferroelectric elements. This high‐power switch will allow one to build an active Delay Line Distribution System (DLDS), which would provide substantial reduction in the length of waveguide, compared to what would be required for the traditional passive DLDS design for NLC. The results of preliminary optimization of the phase shifter at the NLC frequency of 11.424 GHz are presented showing the feasibility of building the switch to control a power of 500 MW. Initial tests at a power of up to 50 MW are planned using the Omega‐P/NRL X‐band magnicon. © 2004 American Institute of Physics
