Tevatron proton injection kicker waveform analysis
On July 25, 1995 a shift of Tevatron beam studies was devoted to examining the shape of the E17 kicker waveform. The purpose of this study was to determine how the kicker may effect the emittance of the Protons once collider operation changed to 36 bunch operation. The kicker was setup to give the most uniform flattop with approximately the correct flattop length. To do this, all 22 cells of the pulse forming network were connected and the predets for the tube timing were set as follows: Main = 1.0 {micro}sec; Clip = 6.0 {micro}sec; and Dump = 4.0 {micro}sec. The data was collected by varying the trigger of the kicker and observing the response of the beam with the BPM system. This timer, the beam synch delay out of a 279 module, only has 7 bucket resolution. Thus any waveform variation smaller than 131 nsec (or greater than 7.6 MHz) will not be observed. The data for the flattop was collected in a different way than the data for the rising edge and falling edge. To collect the flattop data the injection closure was tuned to give a minimum turn by turn oscillation. Under these conditions, a first turn flash frame was recorded as a reference. As the kicker timing was varied, the positions at E17, E19 and E26 were recorded. Also, the amplitude of turn by turn oscillation as measured by the beam line tuner system at D49 was recorded. The effect of the kick given by the timing change was recorded for times that map out the complete flattop of the kicker wave form. In figure 1, the turn by turn amplitude is shown vs kicker trigger setting (in units of MREV). Because the kicker is being delayed, and the beam is always arriving at the same time, the rising edge of the kicker is actually on the right side of the plot, and the end of the flattop is on the left. The x's show the points in time that Protons will pass during 36 bunch operation. The first bunch will pass as the initial transient has stabilized at 1.925 MREV. it can be seen that the flattop is about 400 nsec short, so the clip tube timing will have to be adjusted. Note that this is feasible in that the maximum allowable rise time is 2.617 micro-sec while the rise time to where the oscillation dies out if 2.605 micro-sec.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 15017302
- Report Number(s):
- FERMILAB-EXP-191 FERMILAB-EXP-180; TRN: US200621%%122
- Country of Publication:
- United States
- Language:
- English
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