SNS/BNL Accelerator Systems group 

CA-Department Bldg 817
Upton, NY 11973, USA
The Spallation Neutron Source project is a collaboration between six national laboratories of the United states to build a MegaWatt neutrons source driven by a  proton accelerator. The complex is going to be build in Oak Ridge (Tennessee) and consists of a full energy (1GeV) linac, an accumulator ring and a mercury target with several instruments for neutron scattering. All the information in the project can be found here.

At Brookhaven national laboratory we work mainly in the accumulator ring and transfer lines. Our group is part or the Collider Accelerator Division also in charge of RHIC and the AGS complex.  If you are looking for information in a particular topic you can contact the persons working on it. Here is a list of the accelerator physics group at BNL
 
 
RING WEB PAGE (Yannis Papaphilippou)

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Members of the Accelerator Physics group at  BNL/SNS
Mike Blaskiewicz RF, Impedance, Instabilities blaskiewicz@bnl.gov
Nuria Catalan-Lasheras Ring commissioning team leader. Collimation systems, losses and activation (now at CERN)
Nuria.Catalan.Lasheras@cern.ch
Daniele Davino Impedance measurements davino@bnl.gov
Alexei Fedotov Beam dynamics team leader. Space-Charge, dynamic aperture fedotov@bnl.gov
Yong Y. Lee Injection foil, kicker impedance yylee@bnl.gov
Wuzheng Meng Magnet design and simulation meng@bnl.gov
Seteven Tepikiak Ring team leader.  magnet quality, ring commissioning tem leader,  tepikian@bnl.gov
Deepak Raparia Group Leader: Transport  lines and commissioning team leader.  HEBT and RTBT Transport lines
raparia@bnl.gov
Nick Tsoupas Injection & Extraction channels tsoupas@bnl.gov
Jie Wei STL, Group Leader, Beam dynamics team leader wei1@bnl.gov
S.Y. Zhang Impedances, instabilities syzhang@bnl.gov
Collaborators
Robert Gluckstern  
Ingo Hofmann i.hofmann@gsi.de
George Parzen parzen@bnl.gov

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Technical reports 
Technical reports at BNL.
Technical reports at ORNL.
Technical reports at LANL.
ICFA Beam Dynamics Newsletter, No. 20 including a  Special Section - High Intensity High Brightness Hadron Beams


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Accelerator physics meeting minutes
BNL AP goup weekly meeting
12th March 2001        19th March 2001            26th March 2001           07th May 2001        21st May 2001

March 4, 2002    March 11, 20002     March 18, 2002      March 25, 0    April 1 ,2002 

 April 15, 2002     April 22, 2002    April 29, 2002    May 11, 2002    July 08,2002

July 15, 2002        July 22, 2002     July 29, 2002    August 05, 2002    August 12, 20002

August 26, 2002    September 09, 2002    September 16, 2002    September 30, 2002

October 07, 2002    October 14, 2002  October 21, 2002    October 28, 2002    

November 04, 2002   November 19, 2002  November 25, 2002    December 02,2002

December 09, 2002,    December 16, 2002    December 23, 2002    January 06, 2003

January 13, 2003    January 27,2003       February 24, 2003,      March 03, 2003

March 17, 2003      March 24, 2003    April 07, 2003     April 14, 2003    April 21, 2003

June 02, 2003  June 09, 2003     June 16, 2003    June 23, 2003    June 30, 2003

July 07, 2003    July 28, 2003    August 18, 2003     August 25, 2003   September 8,2003

September 29, 2003     October 13, 2003    October 20, 2003     October 27, 2003

November 10, 2003    November 24,2003     December 01, 2003    December 08, 2003

December 22, 2003      January 05, 2004    January 26, 2004

  

SNS AP Video conference
Page maintained by J. Galambos and J. Holmes at ORNL

Mechanical group weekly meeting
21th March 2001          March 13 2002        April 4, 2002       April 17, 2002        May 16, 2002    June 12, 2002

July 10, 2002    July 25, 2002    July 31, 2002    August 07, 2002    September 18,2002    October 2, 2002    

October 16,2002     November 20, 2002    December 04, 2002    December 18, 2002

May 21, 2003    June 3, 2003    June 26, 2003    July 22, 2003     August 7, 2003    

August 19, 2003    September 3, 2003    September 17, 2003    October 1, 2003

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Other SNS Link
Main entry page for the SNS project at BNL
The page maintained by the controls group at BNL is here
The page maintained by Penny lo Presti for the BNL/SNS group is  here.
The accelerator physics group at Oak Ridge.
Page of Deepak Raparia about the SNS transfer lines HEBT and RTBT.
Page of N. Catalan-Lasheras in Beam losses and collimation
Beam diagnostics web page
ASD weekly reports at Oak Ridge
 
Here are links to the home page of the Laboratories implicated in the construction of the SNS
Argonne National Laboratory
Brookhaven national Laboratory
Lawrence Berkeley National Laboratory
Los Alamos National Laboratory
Oak Ridge National laboratory
Thomas Jefferson National Accelerator Facility
Other links related to high intensity rings
 
ICFA High Intensity Hadron Beams Working Group
LANSCE at LANL (USA)
ISIS at RAL (UK)
AGS at BNL (USA)
CONCERT project page at CEA (France)
Proton Driver at Fermilab (USA)
European Proton Drivers for the Neutrino factory page at CERN (Switzerland)
BNL Proton Driver for the neutrino factory and muon collider at BNL (USA)
JKJ Project (Japan)


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The accumulator ring and transfer lines


The accumulator ring and transfer lines  are responsibility of Brookhaven National laboratory. Here is one of the older versions of the machine. Thanks to Jacques Negrin. The superconducting Linac would be at the left. The second target station is a future upgrade possibility but is not in currently in the baseline. Here you can also find all the released mechanical drawings and photo library
The ring, of 248m of perimeter has a 4-fold symetry. Every arc has four FODO cells and the straight sections are made up from doublet cells with three long ininterrupted straight sections. In the four straight sections we find (clockwise):  injection collimation extraction and the RF cavities. Diagnostics are provided all along the ring.

An approximate and always changing table of parameters that helps to have an idea of what we are talking about here. Compared with other machines of the same energy or size the first thing to note is this is an awful amount of protons!! Here is a link to the official parameter list for the whole accelerator.
 
Particle  Protons
Energy 1 GeV
Intensity 1.4e14
Beam power 1.5 MW
Length 248 m
Dipole Magnetic field 0.7935 T
Tunes (Qx / Qy) 6.4  / 6.3
Natural chromaticity (x / y)  -8.1 / -7.0
Number of injected turns 1060
RF frequency 1058 MHz
Space charge tuneshift 0.15

For a complete description refer to the article published in Physical Review Special Topics
Low-loss design for the high-intensity accumulator ring of the Spallation Neutron Source

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