# Presentation: 822637

## Fundamental Neutron Physics Beamline

*The*
*Fundamental Neutron Physics Beamline*

*at the*
*Spallation Neutron Source*

## Slide 2

## Slide 3

## Drift Tube Linac

***System includes 210 drift tubes, transverse focusing via PM quads, 24 dipole correctors, and associated beam diagnostics***

## Coupled-Cavity Linac

*System consists of 48 accelerating segments, 48 quadrupoles, 32 steering magnets and diagnostics*

***Bridge Coupler 44 final machining ***

***Installation Complete August 2004 ***

## Superconducting Linac

***11 Medium - ************ cryomodules***
***12 High - ************ cryomodules ***
***Cavities exceed gradient specifications***

**Medium beta cavity**

**High beta cavity**

## High-Power RF

***High-Power RF***

***Four CCL systems ***
***81 SCL klystrons****** ***

## Target, Reflectors, and Moderators

*Proton Beam*

*Mercury*
*target*

## Target, Reflectors, and Moderators

*Steel reflector*

*Be reflector*

*Mercury*
*target*

*Proton Beam*

## Target, Reflectors, and Moderators

*Be reflector*

*Steel reflector*

*Cryogenic*
*H**2 **moderators*

*Ambient*
*H**2 **0 moderator*

*Mercury*
*target*

*Proton Beam*

##           Target-Moderator System

## First SNS Beam on Target  - April  28, 2006

*First SNS Beam on Target  - April  28, 2006*

## FNPB Power Ramp-Up

***FNPB Power Ramp-Up***

- First SNS Beam
- 23 Apr 2006

## Slide 14

## Initial Instrument Suite will utilize 16 of 24 Beamlines 

**1B - Disordered Mat’ls**
**Commission 2010**

**2 - Backscattering Spectrometer Commission 2006**

**3 - High Pressure Diffractometer **
**Commission 2008**

**4A - Magnetism Reflectometer **
**Commission 2006**** **

**4B - Liquids Reflectometer**
**Commission 2006**** **

**5 - Cold Neutron Chopper  Spectrometer Commission 2007**

**18 - Wide Angle Chopper  Spectrometer **
**Commission 2007**

**17 - High Resolution Chopper  Spectrometer**
**Commission 2008**

**13 - Fundamental Physics Beamline **
**Commission 2007**

**11A - Powder Diffractometer **
**Commission 2007**

**12 - Single Crystal Diffractometer **
**Commission 2009**

**7 - Engineering Diffractometer **
**IDT CFI Funded **
**Commission 2008**

**6 - SANS **
**Commission 2007**

**14B - Hybrid Spectrometer  **
**Commission 2011**

**15 – Spin Echo**

**9 – VISION**

***Initial Instrument Suite will utilize 16 of 24 Beamlines***

## Beamline 13 Has Been Allocated for Nuclear Physics

**1B - Disordered Mat’ls**
**Commission 2010**

**2 - Backscattering Spectrometer Commission 2006**

**3 - High Pressure Diffractometer **
**Commission 2008**

**4A - Magnetism Reflectometer **
**Commission 2006**** **

**4B - Liquids Reflectometer**
**Commission 2006**** **

**5 - Cold Neutron Chopper  Spectrometer Commission 2007**

**18 - Wide Angle Chopper  Spectrometer **
**Commission 2007**

**17 - High Resolution Chopper  Spectrometer**
**Commission 2008**

**13 - Fundamental Physics Beamline **
**Commission 2007**

**11A - Powder Diffractometer **
**Commission 2007**

**12 - Single Crystal Diffractometer **
**Commission 2009**

**7 - Engineering Diffractometer **
**IDT CFI Funded **
**Commission 2008**

**6 - SANS **
**Commission 2007**

**14B - Hybrid Spectrometer  **
**Commission 2011**

**15 – Spin Echo**

**9 – VISION**

***Beamline 13 Has Been Allocated for Nuclear Physics***

## Two Classes of Experiments

*1. ****Cold Neutron, Broad Band,**** *
*	**Optimal Beam:*
*	**	**Large X-section (10x12 cm**2**), *
*	**	**Large Divergence (> m=3 supermirror)*
*	**	**Broad Wavelength Band (short flight path ~15m)*
*	*
*2. ****Monochromatic Beam at 8.9******Å ******for Ultra Cold Neutrons***
*	**Optimal Beam:*
*	**	**Large X-section (~10x12 cm**2**), *
*	**	**Large Divergence (> m=3 supermirror)*
*	**	**Long Flight Path (~40m)*
*	**	**Low Background Experimental Area** *
*	*

## Slide 18

## FNP DESIGN OVERVIEW

- STARTING POINT

- neutrons

## FNP DESIGN OVERVIEW

-  Super-mirror guide begins in the core vessel, 1m from the moderator
-  CV guide is straight, 6061 Alum
-  100 mm X 120 mm
-  Installed in CV October 04

## FNP DESIGN OVERVIEW

-  Super-mirror _bender_ guide begins in the shutter insert
-  100 mm X 120 mm; 5-channel
-  Installed September 2005.

## FNPB DESIGN - Phase 1

## FNPB Installation as of May 2006

*First ~4m of neutron guides and benders*
*First chopper housing*
*Shielding sufficient for low power SNS Operation*

## FNPB Schedule

***FNPB Schedule***

- Early Finish Date
-  Fund. Phys. Beam

- First SNS Beam
- 23 Apr 2006

- “UCN” Beamline
- Available

***End of Presentation***