Abstract
Instead of slip stacking, an alternate method of doubling the linear intensity of the Fermilab Main Injector is discussed. This method makes use of rf barriers to transfer 12 booster batches from the Fermilab Booster to the Main Injector in 12 consecutive booster cycles, totaling 800 ms. After that, adiabatic capture of the beam into 53 MHz buckets can be accomplished in about 10 ms. Because the beam is debunched during the injection process and no rf voltage is required, the beam loading voltages in the rf cavities are small and can be eliminated by a combination of counterphasing and mechanical shorts.
Highlights
In the Fermilab Run IIa, the Fermilab Main Injector is supposed to deliver one booster batch of 5.0 3 1012 protons (84 bunches each containing 6 3 1010 protons) to the target for the production of antiprotons in a 1.5 s acceleration cycle [1]
At the injection total energy of E 8.938 GeV, the Main Injector has a circumference in time of T0 11.13 ms, which is exactly seven booster batches long
The acceleration cycle time in Run IIb will be increased to 2.0 s
Summary
In the Fermilab Run IIa, the Fermilab Main Injector is supposed to deliver one booster batch of 5.0 3 1012 protons (84 bunches each containing 6 3 1010 protons) to the target for the production of antiprotons in a 1.5 s acceleration cycle [1]. The acceleration cycle time in Run IIb will be increased to 2.0 s This cycle time should be long enough to load the Main Injector with six booster batches each of length Tb 1.59 ms, slip stack one batch to be used for antiroton production, and extract the other five batches for the NuMI neutrino experiment. This will lengthen the Main Injector acceleration cycle significantly and is unacceptable Another method of doubling beam density by barriers was introduced by Griffin [9].
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