Beam/ Halo Diagnostics
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Beam/ Halo Diagnostics
R. Fiorito, A. Shkvarunets, H. Zhang
Institute for Research in Electronics and Applied PhysicsUniversity of Maryland
Presented (with apologies)
Michelle Shinn (JLab)
1
Goals: measure low intensity halo properties (distribution and emittance) in presence of high intensity but low emittance core
Approach: use OTR or OSR and optical masking to separate out halo and core
Two masking methods : I. Fixed (pinhole or stop); II. Adaptive (programable digital micromirror array)
OTR and OSR Halo Imaging Systems installed at FEL
Site of OTR and OSR diagnostics
experiments
Electron beam
OTR
Camera 2
Mask
beam imaging
camera
OTR farfield imaging camera
beam( pinhole
or stop )
(farfield OTR gives
localized divergence within
pinhole or outside stop)
I. Fixed Optical Mask (used with OTR station at FEL beam dump)
polarizer
II. Adaptive masking using digital micro-mirror array*
*DLPTM 1100 Texas Instruments Inc.
450
4
micromirror size: 13.68 m x 13.68 m
No of elements: 1024 X 768 pixels
Array switching rate: 9600 patterns / sec
PC interface: USB 2.0
micromirror
Rotation axis
DMA Imaging System Developed at UMD/ UMER
180 Frames
32 m
m
900 Frames
32 m
m
5
Halo measurements at UMER (7 mA beam) using DMA
Screenboundary
Dynamic Range Test of DMD with intense UMER beam and circular mask
20 275 1000
2000 3000
Integration Frames:
7Integration Frames:
32m
m
Dynamic Range Measurement using Circular Mask and intense 23 mA beam: DR ~10(5)
0 50 100 150 200 250 300 350 400 450 50010
-6
10-5
10-4
10-3
10-2
10-1
100
Pixel
Nom
aliz
ed C
ount
0
256
32m
m
8
Reconstructed beam profile
1000 mm
500 mm
OSRPort
(2F06)
Gallery optics: top view
1219
mm
457 mm
DMA
Camera
24o
Optics for DMA Halo Experiment using OSR
(Installed at FEL 8/2010 )
Vault Optics: side view
5 m PVC tube
FEL Vaultceiling
Gallery optics: side view
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