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Title: The A0 abort system for the Tevatron upgrade

Abstract

The installation of electrostatic separator modules at B48 and C17 in the Tevatron necessitates changes to the Tevatron abort system. There will no longer be room for either the proton or antiproton kicker magnets used in the present system. The kickers at C17 will be permanently removed. The kickers at B48 will be temporarily removed for collider operation and will be replaced for fixed target operation. The existing proton abort system will remain unchanged during fixed target operation. This note describes a proposed abort system for operation in the collider mode for 22 on 22 bunches and provides details of specifications for the required components. In certain cases, for example in the case of the pulsers for the magnets and the absorber assembly, system components are designed with the option of upgrading to 44 on 44 bunch operation in mind. 8 refs., 14 figs.

Authors:
Publication Date:
Research Org.:
Fermi National Accelerator Lab., Batavia, IL (USA)
OSTI Identifier:
6473182
Report Number(s):
FNAL-TM-1564
ON: DE89009705
DOE Contract Number:
AC02-76CH03000
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; FERMILAB TEVATRON; MODIFICATIONS; CONTROL SYSTEMS; KICKER MAGNETS; POWER SUPPLIES; ACCELERATORS; CYCLIC ACCELERATORS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; ELECTRONIC EQUIPMENT; EQUIPMENT; MAGNETS; SYNCHROTRONS; 430300* - Particle Accelerators- Auxiliaries & Components

Citation Formats

Crawford, C. The A0 abort system for the Tevatron upgrade. United States: N. p., 1989. Web. doi:10.2172/6473182.
Crawford, C. The A0 abort system for the Tevatron upgrade. United States. doi:10.2172/6473182.
Crawford, C. 1989. "The A0 abort system for the Tevatron upgrade". United States. doi:10.2172/6473182. https://www.osti.gov/servlets/purl/6473182.
@article{osti_6473182,
title = {The A0 abort system for the Tevatron upgrade},
author = {Crawford, C.},
abstractNote = {The installation of electrostatic separator modules at B48 and C17 in the Tevatron necessitates changes to the Tevatron abort system. There will no longer be room for either the proton or antiproton kicker magnets used in the present system. The kickers at C17 will be permanently removed. The kickers at B48 will be temporarily removed for collider operation and will be replaced for fixed target operation. The existing proton abort system will remain unchanged during fixed target operation. This note describes a proposed abort system for operation in the collider mode for 22 on 22 bunches and provides details of specifications for the required components. In certain cases, for example in the case of the pulsers for the magnets and the absorber assembly, system components are designed with the option of upgrading to 44 on 44 bunch operation in mind. 8 refs., 14 figs.},
doi = {10.2172/6473182},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1989,
month = 3
}

Technical Report:

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  • The PEP-II project has two storage rings. The HER (High Energy Ring) has up to 1.48 A of election beam at 9 GeV, and the LER (Low Energy Ring) has up to 2.14 A of positron beam at 3.1 GeV. To protect the HER and LER beam lines in the event of a ring component failure, each ring has an abort kicker system which directs the beam into a dump when a failure is detected. Due to the high current of the beams, the beam kick is tapered from 100% to 80% in 7.33 {micro}S (the beam transit time aroundmore » the ring). This taper distributes the energy evenly across the window which separates the ring from the beam dump such that the window is not damaged. The abort kicker trigger is synchronized with the ion clearing gap of the beam allowing for the kicker field to rise from 0-80% while there is no beam in the kicker magnet. Originally the kicker system was designed for a rise time of 370nS [1], but because the ion clearing gap was reduced in half, so was the rise time requirement for the kicker. This report discusses the design of the system interlocks, diagnostics, and modulator with the modifications necessary to accommodate an ion clearing gap of 185nS.« less
  • A key feature of the Tevatron upgrade is the placement of proton and anti-proton bunches on the branches of a double helix which winds around the current closed orbit. Electrostatic separators will transfer the bunches on and off the double helix so that they experience head-on collisions only at the experimental areas, B0 and D0, all other encounters occurring at large transverse separation. In this way the number of bunches, and the luminosity, can be increased without a proportional growth in the beam-beam tune shift. The scenario raises a number of beam dynamics issues, especially (a) the consequences of samplingmore » magnetic fields far from the magnets' center lines, and (b) the effects of the long-range beam-beam interaction. This report presents the results of calculations and simulations done to date to explore (b); a Fermilab team have been studying (a), both experimentally and theoretically, but we shall not review those efforts here. 9 refs., 17 figs.« less