Performance of the Debuncher Momentum Cooling Notch Filters
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Pbar stacking rate is controlled by the speed of stochastic cooling in the Debuncher and the momentum spread of freshly injected pbars to the Accumulator. The Main Injector is capable of 1.5-second repetition rates. It is currently ramping at a 2 to 2.2 second rate due to limitations of the cooling systems. To attain the maximum possible stacking rate, cooling needs to be optimized to take advantage of the faster rep rate. The Debuncher momentum-cooling systems have reached an asymptotic momentum spread that is believed to be higher than expected. An investigation to understand the performance of the notch filters, which control the momentum cooling systems, was undertaken. Each of the four notch filters was measured in situ by using the network analyzer and switch tree that connects the cooling systems. The filters were calibrated on the short leg and data taken for the long leg. The result is a vector measurement that captures the amplitude and phase balance for each filter. The phase is delay adjusted for the revolution frequency. The delay and effective notch filter frequency are displayed. The delay is adjusted to minimize the integral signal notch depth parameter. This is a summation of the notch depth over the signal bandwidth for each filter as displayed by the dotted lines on the graphs. This value of delay is also used to calculate the notch filter dispersion, which, overall, looks very good. The dispersion is a measure of the variation in notch frequency from true harmonic behavior. Finally, the effective notch depth (taking into account the effects of dispersion) at harmonics of the revolution frequency is plotted for each filter.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1985064
- Report Number(s):
- FERMILAB-PBAR-NOTE--672; oai:inspirehep.net:864176
- Country of Publication:
- United States
- Language:
- English
Similar Records
Momentum precooling in the debuncher ring for the Fermilab Tevatron I project
Phasing of Debuncher Stochastic Cooling Transverse Systems
Debuncher Energy Mismatch
Conference
·
Mon Aug 01 00:00:00 EDT 1983
· IEEE Trans. Nucl. Sci.; (United States)
·
OSTI ID:5436251
Phasing of Debuncher Stochastic Cooling Transverse Systems
Technical Report
·
Wed Mar 08 23:00:00 EST 2000
·
OSTI ID:984628
Debuncher Energy Mismatch
Technical Report
·
Mon Jan 24 23:00:00 EST 2000
·
OSTI ID:984606