IMAGE ACQUISITION SYSTEM FOR THE INJECTION DUMP AT THE
SPALLATION NEUTRON SOURCE*W. Blokland†, A. Oguz, D. Willis, and N. Evans, Oak Ridge National Laboratory, Oak Ridge, TN, USA

Introduction

The camera installed in theshielding survived many
months of running, see Fig 3.

The Image Acquisition System for the Injection Dump visualizes
the different beamlets on the vacuum window for the upgradedinjection dump beam line (Fig 1):• The two species are “H0 beam” (partially stripped H− beam),and “H− beam” (beam that misses the primary foil).
• PXI platform with LabVIEW and EPCIS Channel Access
implements the data-acquisition including timing decoder.
• Non-radhard GigE camera with shielding.

Dosimeter location

Figure 3: The Camera image
after 1800 MWHrs of exposure at
1.4MW at 1 GeV. Left a close-upof the test image center.

Acquisition System
The system is based on PXIand LabVIEW (Fig 4):• The PXIe-8840• PXIe-4112 to reboot FLIR
Blackfly 23S6M-C• SNS Timing with PXIe-7971• BK Precision 1687B power
supply to power lamp
Figure 4: System Hardware

Figure 1. The Ring Injection Dump line with the calculated
projection of beam particles on dump window. The red letters
indicate dosimeter locations•••••

The software, see Fig 5 provides:
horizontal and vertical projections,centroid of the image,a circle overlay matching the edge of the coated area,an adjustable crosshair overlay, andan EPICS Channel Access interface.

Imaging Setup
The imaging system’s requirementsare:• Survive a 16-hour study to document
the new beamline’s behavior,• position resolution of < 4 mm,accuracy < 10 mm à Use fiducials(Fig 2), and• interface with the EPICS controls
systemFigure 2. Fiducials on window.

To evaluate the feasibility of the camera (FLIR Blackfly 23S6MC), we measured radiation doses at different locations and thefinal selected location with shielding, see Table1. We used
CERN HiRadMat results, [3], to convert doses to lifetimes.
Table 1. Doses, expected Time to Death (T2D), and Time toSignificant Event (T2SE) at 1.4 MW beam power.
Locat
Totalion(Gy/MWHr)
123
4
5/6

0.29
0.24
0.04
0.05
0.08

T2D(Hrs)
unshielded

T2SE (Hrs)
unshielded2853392246
1797
998

0.91
1.09
7.20
5.76
3.20

T2D (Hrs) T2SE (Hrs)shielded shielded
11,50037

Figure 5: The CSS Control Room interface (left) and the LabVIEW expert
screen (right).

Conclusions
An image acquisition system has been created for theinjection dump to visualize the waste beam from the stripping
foil using a shielded non-radhard camera to provide months ofoperation.
Unfortunately, the installation of the optics system was delayed
due to problems with the installation of the coated vacuum
window and no field measurements have yet been taken.
ACKNOWLEDGEMENTS:
The authors wish to thank Melissa Harvey for her work on the shielding.
REFERENCES:
A. Rakhman, D. Willis, D. Aikens, J. Mason, W. Blokland, N. Evans, N. Gerber, and M. Harvey, "Offaxis, Reflective Schmidt Telescope Design for Proton Beam Imaging Sys-tem*," in OSA Optical Design andFabrication 2021 (Flat Optics, Freeform, IODC, OFT), F. Capasso, et al., eds., OSA Technical Digest (Optica
Publishing Group, 2021), paper 120781K.
W. Blokland and A. Rakhman, “Feasibility Study of a Non-Rad Camera for the SNS* Ring InjectionDump Im-aging System”, Poster presented at the 9th Int. Beam In-strum. Conf. (IBIC'20), Santos, Brazil, Sep. 2020,
paper THPP32, unpublished.
S. Burger, “Scintillation Screens and Optical Technology for transverse Profile Measurements”,
Presentation at AR-IES-ADA Topical Workshop, Krakow, Poland, April 1 to 3, 2019.

* SNS is managed by UT-Battelle, LLC, under contract DEAC05-00OR22725 for the U.S. Department of Energy† blokland@ornl.gov