A VERY Informal Note on Cooling Pbars from the Main Injector

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For the Accelerator Upgrade (Phase I), we have chosen to upgrade the cooling in the following ways: (A) Increasing the existing 800 W system to 1600 W. (B) Adding momentum cooling (2x reduction in {Delta}p). (C) Increasing the electrode gap by {radical}(30/20). The electrode gap increase makes the yield greater at the price of reducing the cooling efficiency. The performance of the cooling system has been calculated in the approximation that the cooling process can be described by a Fokker-Planck equation. It appears that the existing anti-proton source can do fairly well with the anti-proton flux which is expected from ... continued below

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11 pages

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Marriner, J. July 3, 1989.

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Description

For the Accelerator Upgrade (Phase I), we have chosen to upgrade the cooling in the following ways: (A) Increasing the existing 800 W system to 1600 W. (B) Adding momentum cooling (2x reduction in {Delta}p). (C) Increasing the electrode gap by {radical}(30/20). The electrode gap increase makes the yield greater at the price of reducing the cooling efficiency. The performance of the cooling system has been calculated in the approximation that the cooling process can be described by a Fokker-Planck equation. It appears that the existing anti-proton source can do fairly well with the anti-proton flux which is expected from the main injector. The Debuncher cooling will be noticeably inefficient, but probably acceptable. Improvements can be made by changing the Debuncher bandwidth to 4-8 GHz (perhaps several M$) or by increasing the accumulator aperture (15{pi} would be ambitious, but maybe not crazy). The existing 1-2 GHz stack tail system performs surprisingly well on paper - capable of fluxes up to 1.4 x 10{sup 11} per hour. However, it is not clear that our 'as built' stack tail system is really that good - having achieved a maximum of 0.6 x 10{sup 11} to date. Futhermore, there are noticeable problems with stability and roll-off of the stacking rate at high intensities (beyond 200 mA!). In order to increase the stacking rate beyond 1.4 x 10{sup 11} per hour, one must consider a higher bandwidth system. The simplest way to implement the system would be to change {gamma}t such that =.01 (half its current value of 0.02). Clearly changing {gamma}t and upgrading the cooling system would also run in the multi-M$ range.

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11 pages

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  • Report No.: FERMILAB-PBAR-NOTE-511
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/983971 | External Link
  • Office of Scientific & Technical Information Report Number: 983971
  • Archival Resource Key: ark:/67531/metadc1014347

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  • July 3, 1989

Added to The UNT Digital Library

  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 25, 2017, 4:08 p.m.

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Marriner, J. A VERY Informal Note on Cooling Pbars from the Main Injector, report, July 3, 1989; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1014347/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.