Some estimation concerning crossing transition of the main injector
Abstract
We estimate some parameters pertaining to the transition crossing of the Main Injector. These include the nonadiabatic time, bunch length and bunch height at transition, the microwave growth across transition driven by a longitudinal impedance, and the parameters that govern the Umstaetter's and the Johnsen's effects. 9 refs., 1 tab.
- Authors:
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab., Batavia, IL (USA)
- Sponsoring Org.:
- DOE/ER
- OSTI Identifier:
- 6708339
- Alternate Identifier(s):
- OSTI ID: 6708339; Legacy ID: DE90014880
- Report Number(s):
- FNAL-TM-1670
ON: DE90014880; TRN: 90-028710
- DOE Contract Number:
- AC02-76CH03000
- Resource Type:
- Technical Report
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; BEAM INJECTION; BEAM BUNCHING; ELECTRIC IMPEDANCE; SPACE CHARGE; BEAM DYNAMICS; IMPEDANCE 430302* -- Particle Accelerators-- Injection & Extraction Systems
Citation Formats
Ng, King-Yuen. Some estimation concerning crossing transition of the main injector. United States: N. p., 1990.
Web. doi:10.2172/6708339.
Ng, King-Yuen. Some estimation concerning crossing transition of the main injector. United States. doi:10.2172/6708339.
Ng, King-Yuen. Fri .
"Some estimation concerning crossing transition of the main injector". United States.
doi:10.2172/6708339. https://www.osti.gov/servlets/purl/6708339.
@article{osti_6708339,
title = {Some estimation concerning crossing transition of the main injector},
author = {Ng, King-Yuen.},
abstractNote = {We estimate some parameters pertaining to the transition crossing of the Main Injector. These include the nonadiabatic time, bunch length and bunch height at transition, the microwave growth across transition driven by a longitudinal impedance, and the parameters that govern the Umstaetter's and the Johnsen's effects. 9 refs., 1 tab.},
doi = {10.2172/6708339},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 1990},
month = {Fri Jun 01 00:00:00 EDT 1990}
}
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Recent transition crossing results from the Fermilab Main Ring
This paper outlines the known mechanisms for emittance dilution and beam loss during transition crossing. These include scraping, Johnsen`s nonlinear effect, bunch length mismatch, microwave and negative-mass instabilities, and beam loading. A recent experiment on transition crossing performed with 13 proton bunches injected into the Main Ring is discussed. -
Transition crossing in the main injector
This report summarizes the study of various longitudinal problems pertaining to the transition-energy crossing in the proposed Fermi Lab Main Injector. The theory indicates that the beam loss and bunch-area growth are mainly caused by the chromatic non-linear effect, which is enhanced by the space-charge force near transition. Computer simulation using the program TIBETAN shows that a {gamma}{sub T} jump'' of about 1.5 unit within 1 ms is adequate to achieve a clean'' crossing in the currently proposed h{equals}588 scenario. 19 refs., 4 figs. -
Simulations of transition crossing in the main injector
The design goal for the Fermilab Main Injector (FMI) is to accelerate a minimum of 6{times}10{sup 10} protons per bunch through the transition. We present here the results from simulation studies of the transition crossing in the FMI using the particle tracking code ESME.