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Title: Low-Energy Emittance Studies with the new Allison Emittance Scanner

Abstract

The new SNS Allison emittance scanner measures emittances of 65 kV ion beams over a range of +/- 116 mrad. Its versatile control system allows for time-dependent emittance measurements using an external trigger to synchronize with pulsed ion beam systems. After an adjustable initial delay, the system acquires an array of equally-delayed beam current measurements, each averaged over a certain time span, where all three time parameters are user selectable. The zero offset of the beam current measurements is determined by averaging a fraction of 1 ms shortly before the start of the ion beam pulse. This paper discusses the optimization of the angular range. In addition it presents the first results and reports an unresolved artefact. Data are presented on the time evolution of emittance ellipses during 0.8 ms long H- beam pulses emerging from the SNS test LEBT, which is important for loss considerations in the SNS accelerator. Additional data explore the emittance growth observed with increasing beam current and/or increasing RF-power.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1004950
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: PAC'09, Vancouver, Canada, 20090503, 20090508
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; NEUTRON SOURCES; SPALLATION; BEAM SCANNERS; BEAM EMITTANCE; BEAM CURRENTS; CONTROL SYSTEMS; ION BEAMS; PERFORMANCE

Citation Formats

Stockli, Martin P, Blokland, Willem, Gorlov, Timofey V, Han, Baoxi, Long, Cary D, Pennisi, Terry R, and Assadi, Saeed. Low-Energy Emittance Studies with the new Allison Emittance Scanner. United States: N. p., 2010. Web.
Stockli, Martin P, Blokland, Willem, Gorlov, Timofey V, Han, Baoxi, Long, Cary D, Pennisi, Terry R, & Assadi, Saeed. Low-Energy Emittance Studies with the new Allison Emittance Scanner. United States.
Stockli, Martin P, Blokland, Willem, Gorlov, Timofey V, Han, Baoxi, Long, Cary D, Pennisi, Terry R, and Assadi, Saeed. 2010. "Low-Energy Emittance Studies with the new Allison Emittance Scanner". United States.
@article{osti_1004950,
title = {Low-Energy Emittance Studies with the new Allison Emittance Scanner},
author = {Stockli, Martin P and Blokland, Willem and Gorlov, Timofey V and Han, Baoxi and Long, Cary D and Pennisi, Terry R and Assadi, Saeed},
abstractNote = {The new SNS Allison emittance scanner measures emittances of 65 kV ion beams over a range of +/- 116 mrad. Its versatile control system allows for time-dependent emittance measurements using an external trigger to synchronize with pulsed ion beam systems. After an adjustable initial delay, the system acquires an array of equally-delayed beam current measurements, each averaged over a certain time span, where all three time parameters are user selectable. The zero offset of the beam current measurements is determined by averaging a fraction of 1 ms shortly before the start of the ion beam pulse. This paper discusses the optimization of the angular range. In addition it presents the first results and reports an unresolved artefact. Data are presented on the time evolution of emittance ellipses during 0.8 ms long H- beam pulses emerging from the SNS test LEBT, which is important for loss considerations in the SNS accelerator. Additional data explore the emittance growth observed with increasing beam current and/or increasing RF-power.},
doi = {},
url = {https://www.osti.gov/biblio/1004950}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2010},
month = {Fri Jan 01 00:00:00 EST 2010}
}

Conference:
Other availability
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