skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: THE LINAC LASER NOTCHER FOR THE FERMILAB BOOSTER

Abstract

In synchrotron machines, the beam extraction is accomplished by a combination of septa and kicker magnets which deflect the beam from an accelerator into another. Ideally the kicker field must rise/fall in between the beam bunches. However, in reality, an intentional beam-free time region (aka "notch") is created on the beam pulse to assure that the beam can be extracted with minimal losses. In the case of the Fermilab Booster, the notch is created in the ring near injection energy by the use of fast kickers which deposit the beam in a shielded collimation region within the accelerator tunnel. With increasing beam power it is desirable to create this notch at the lowest possible energy to minimize activation. The Fermilab Proton Improvement Plan (PIP) initiated an R&D project to build a laser system to create the notch within a linac beam pulse at 750 keV. This talk will describe the concept for the laser notcher and discuss our current status, commissioning results, and future plans.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3]
  1. Fermilab
  2. PriTel, Inc
  3. Optical Engines, Inc
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:
1329669
Report Number(s):
FERMILAB-CONF-16-388-AD
1492686
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 22nd International Symposium on Spin Physics, Urbana, IL, USA, 09/25-09/30/2016
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Johnson, David E,, Duel, Kevin, Gardner, Matthew, Johnson, Todd, Slimmer, David, Patil, Screenvias, and Tafoya, Jason. THE LINAC LASER NOTCHER FOR THE FERMILAB BOOSTER. United States: N. p., 2016. Web.
Johnson, David E,, Duel, Kevin, Gardner, Matthew, Johnson, Todd, Slimmer, David, Patil, Screenvias, & Tafoya, Jason. THE LINAC LASER NOTCHER FOR THE FERMILAB BOOSTER. United States.
Johnson, David E,, Duel, Kevin, Gardner, Matthew, Johnson, Todd, Slimmer, David, Patil, Screenvias, and Tafoya, Jason. 2016. "THE LINAC LASER NOTCHER FOR THE FERMILAB BOOSTER". United States. doi:. https://www.osti.gov/servlets/purl/1329669.
@article{osti_1329669,
title = {THE LINAC LASER NOTCHER FOR THE FERMILAB BOOSTER},
author = {Johnson, David E, and Duel, Kevin and Gardner, Matthew and Johnson, Todd and Slimmer, David and Patil, Screenvias and Tafoya, Jason},
abstractNote = {In synchrotron machines, the beam extraction is accomplished by a combination of septa and kicker magnets which deflect the beam from an accelerator into another. Ideally the kicker field must rise/fall in between the beam bunches. However, in reality, an intentional beam-free time region (aka "notch") is created on the beam pulse to assure that the beam can be extracted with minimal losses. In the case of the Fermilab Booster, the notch is created in the ring near injection energy by the use of fast kickers which deposit the beam in a shielded collimation region within the accelerator tunnel. With increasing beam power it is desirable to create this notch at the lowest possible energy to minimize activation. The Fermilab Proton Improvement Plan (PIP) initiated an R&D project to build a laser system to create the notch within a linac beam pulse at 750 keV. This talk will describe the concept for the laser notcher and discuss our current status, commissioning results, and future plans.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • A report on the challenges confronting the Fermilab Linac and Booster accelerators is presented. Plans to face those challenges are discussed. Historically, the Linac/Booster system has served only as an injector for the relatively low repetition rate Main Ring synchrotron. With construction of an 8 GeV target station for the 5 Hz MiniBooNE neutrino beam and requirements for rapid multi-batch injection into the Main Injector for the NUMI/MINOS experiment, the demand for 8 GeV protons will increase more than an order of magnitude above recent high levels. To meet this challenge, enhanced ion source performance, better Booster orbit control, amore » beam loss collimation/localization system, and improved diagnostics are among the items being pursued. Booster beam loss reduction and control are key to the entire near future Fermilab high energy physics program.« less
  • The FNAL LINAC will soon be asked to produce beam at 7.5 Hz. FNAL LINAC extraction involves sweeping the H-minus beam over a Lambertson magnet. The higher repetition rates are expected to activate the Lambertson magnet. A pulsed laser has been installed to make a notch in the beam so that beam will not sweep over the magnet.
  • In July 1988 a small working group was formed to develop a conceptual design for a high field superconducting dipole magnet suitable for use in the Phase III upgrade at Fermilab. The Phase III upgrade calls for replacement of the existing Tevatron with higher field magnets to boost the energy of the fixed target program to 1.5 TeV and to add a 1.8 TeV collider program. As the work of this group evolved it became clear that the resulting design might be applicable to more than just the proposed upgrade. In particular, it seemed plausible that the work might bemore » applicable to the high energy booster (HEB) for the SSC. At the Breckenridge Workshop in August 1989 interest in a third project began to surface, namely the revamping of an earlier proposal for a dedicated collider at Fermilab. We refer to this proposal as the FNAL Independent Collider. The requirements for the dipole magnets for this independent collider appear to be remarkably similar to those proposed for the Phase III upgrade and the SSC HEB. The purpose of this report is to compare the conceptual design of the dipoles developed for the Phase III proposal with the requirements of those for the SSC HEB, the FNAL Independent Collider, and a hybrid design which could serve the needs of both. The Phase III design will be used as the reference point for parameter scaling. 4 figs., 3 tabs.« less
  • A Linac Afterburner is proposed to raise the energy of the beam injected into the Femrilab Booster from 400 MeV to about 600 MeV, thereby alleviating the longitudinal and transverse space-charge effects at low energy that currently limit its performance. The primary motivation is to increase the integrated luminosity of the Tevatron Collider in Run II, but other future programs would also recap substantial benefits. The estimated cost is $23M.
  • The transition at 116 MeV between tank 5 of Fermilab's 200 MeV H/sup /minus// linac and a proposed 400 MeV 805 MHz side coupled linac requires both longitudinal and transverse phase plane beam matching. The design of the transition section is based on a 90/degree/ longitudinal phase oscillation at intermediate gradient combined with a sufficient number of quadrupoles to match transverse beam ellipses and simultaneously limit extreme beam width in the matching process. Both doublet and FODO variants of the transverse matching are satisfactory in concept; the choice is part of current design work. 4 refs., 2 figs., 3 tabs.