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Title: Fast Transverse Instability and Electron Cloud Measurements in Fermilab Recycler

Abstract

A new transverse instability is observed that may limit the proton intensity in the Fermilab Recycler. The instability is fast, leading to a beam-abort loss within two hundred turns. The instability primarily affects the first high-intensity batch from the Fermilab Booster in each Recycler cycle. This paper analyzes the dynamical features of the destabilized beam. The instability excites a horizontal betatron oscillation which couples into the vertical motion and also causes transverse emittance growth. This paper describes the feasibility of electron cloud as the mechanism for this instability and presents the first measurements of the electron cloud in the Fermilab Recycler. Direct measurements of the electron cloud are made using a retarding field analyzer (RFA) newly installed in the Fermilab Recycler. Indirect measurements of the electron cloud are made by propagating a microwave carrier signal through the beampipe and analyzing the phase modulation of the signal. The maximum betatron amplitude growth and the maximum electron cloud signal occur during minimums of the bunch length oscillation.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1251175
Report Number(s):
FERMILAB-CONF-14-566-AD-APC
1362690
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, East Lansing, MI, 11/10-11/14/2014
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Eldred, Jeffery, Adamson, Philip, Capista, David, Eddy, Nathan, Kourbanis, Ioanis, Morris, Denton, Thangaraj, Jayakar, Yang, Ming-Jen, Zwaska, Robert, and Ji, Yichen. Fast Transverse Instability and Electron Cloud Measurements in Fermilab Recycler. United States: N. p., 2015. Web.
Eldred, Jeffery, Adamson, Philip, Capista, David, Eddy, Nathan, Kourbanis, Ioanis, Morris, Denton, Thangaraj, Jayakar, Yang, Ming-Jen, Zwaska, Robert, & Ji, Yichen. Fast Transverse Instability and Electron Cloud Measurements in Fermilab Recycler. United States.
Eldred, Jeffery, Adamson, Philip, Capista, David, Eddy, Nathan, Kourbanis, Ioanis, Morris, Denton, Thangaraj, Jayakar, Yang, Ming-Jen, Zwaska, Robert, and Ji, Yichen. Sun . "Fast Transverse Instability and Electron Cloud Measurements in Fermilab Recycler". United States. doi:. https://www.osti.gov/servlets/purl/1251175.
@article{osti_1251175,
title = {Fast Transverse Instability and Electron Cloud Measurements in Fermilab Recycler},
author = {Eldred, Jeffery and Adamson, Philip and Capista, David and Eddy, Nathan and Kourbanis, Ioanis and Morris, Denton and Thangaraj, Jayakar and Yang, Ming-Jen and Zwaska, Robert and Ji, Yichen},
abstractNote = {A new transverse instability is observed that may limit the proton intensity in the Fermilab Recycler. The instability is fast, leading to a beam-abort loss within two hundred turns. The instability primarily affects the first high-intensity batch from the Fermilab Booster in each Recycler cycle. This paper analyzes the dynamical features of the destabilized beam. The instability excites a horizontal betatron oscillation which couples into the vertical motion and also causes transverse emittance growth. This paper describes the feasibility of electron cloud as the mechanism for this instability and presents the first measurements of the electron cloud in the Fermilab Recycler. Direct measurements of the electron cloud are made using a retarding field analyzer (RFA) newly installed in the Fermilab Recycler. Indirect measurements of the electron cloud are made by propagating a microwave carrier signal through the beampipe and analyzing the phase modulation of the signal. The maximum betatron amplitude growth and the maximum electron cloud signal occur during minimums of the bunch length oscillation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}

Conference:
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