nsls-ii site vibration measurements...nsls-ii site vibration measurements c. spataro, mechanical...
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1 BROOKHAVEN SCIENCE ASSOCIATES
NSLS-II Site Vibration Measurements
C. Spataro, Mechanical Engineering Group, NSLS-II
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
2 BROOKHAVEN SCIENCE ASSOCIATES
Acknowledgement
L. Carr, W. Cheng, Y. Chu, R. Deng, L. Doom, T. Dilgen, J. Dvorak, N. Fukuto, I. Jarrige, B. Leonhardt, Shaftan, N. Simos, J. Skaritka, R. Smith, M. Sullivan, G. Wang, F. Willeke.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Many thanks to the following who’ve been instrumental in the hands-on vibration and thermal stability work over the past five years: J. Duff, A. Jain, F. Lincoln, V. Ravindranath, S. Sharma, W. Themann. An many thanks to the following who’ve offered their advice and support.
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Mechanical Stability Issues at BNL
High performance goals of the new light sources require stringent mechanical stability of their equipment such as magnets, BPMs, slits, mirrors, monochromators, and detectors. The mechanical stability of these components can be compromised by site-wide ground vibrations, local vibration sources (pumps, motors, etc.), and fluctuations in air and water temperatures. This presentation will highlight the results of several studies at the BNL site to characterize ground vibrations and their correlations with the nearby expressway and railroad.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
4 BROOKHAVEN SCIENCE ASSOCIATES
Outline 1. Introduction 2. Motivation for Stability Measurements 3. Sources of Instabilities 4. Ground Motion Measurements 5. Green Field Studies 6. NSLS-II Vibration Studies 7. Thermal Studies 8. BNL Site Studies 7. Mitigation Techniques 8. Future Improvements
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
5 BROOKHAVEN SCIENCE ASSOCIATES
Motivation for Stability Measurements Goal: Short term stability (AC) & Long term stability (DC ) •NSLS-II- low emittance and small beam size are needed to achieve greater intensity and brightness. Fast orbit correction can compensate for effects due to vibration and temperature but not all of it.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Mechanical RMS 4-50 Hz Thermal < 0.1 Hz.
Stability Requirements (Vibration and Thermal):
Requirements ΔX RMS(nm) ΔY RMS(nm)Magnet to Magnet < 157 < 22
Girder to Girder < 310 < 72BPMs < 100 < 100
Slits (over 8 hours) < 1 µm < 1 µm
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Sources of Instabilities- Natural, Cultural, Electrical, and Mechanical
Natural Sources •Lunar Tides (Long Island -1000 miles of linear coast). •Solar Tides (Half the magnitude of lunar tides). •Earthquakes. •Wind. •Barometric pressure. •Seasonal changes Cultural Sources •Aircraft, helicopters (BNL has a heliport). •Automobile Traffic. (6000 miles of roadways) •Trains (700 miles of tracks) •People (~ 8 million on Long Island) •Pager system in NSLS-II ring. •Thermal sources •Construction
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Electrical Sources • Power supply ripple (and
harmonics) • 60 Hz noise • Thermal sources – power
supplies,etc Mechanical Sources • AC handlers • Pump skids • Water flow/Liquid helium
induced vibrations • Water chiller tower • Vacuum pumps • Air temperature fluctuations
7 BROOKHAVEN SCIENCE ASSOCIATES
Ground Motion Measurements
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Analysis: FFT is performed on time domain data Results: Integrated Displacement Time Profiles Integrated Displacement vs Frequency Power spectrum density (PSD) vs Frequency Correlation vs Frequency Plot
Instrument ManufacturerLower
Frequenccy Limit (Hz)
Upper Frequency Limit (Hz)
Seismometer Guralp 0.005 50
Geophone Sercel 1 1000
Accelerometer PCB 0.06 450
Guralp Seismometer Sercel Geophone
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Ground Motion Measurements
• The ground motion below 4 Hz was assumed to be correlated over the length of the storage ring cell (25 m).
• Temperature fluctuation in the tunnel was specified to be ± 0.1º C.(in time)
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
1E-101E-091E-081E-071E-061E-051E-041E-031E-021E-011E+001E+01
1 10 100Dis
plac
emen
t PSD
(µm
2 /Hz)
Frequency (Hz)
NSLS-II Floor RMS Displacements on NSLS-II floor (2-30) Hz: 69 nm (30-100) Hz: 3 nm
9 BROOKHAVEN SCIENCE ASSOCIATES
Ground Motion Measurements– NSLSII SR Floor and Girder
The maximum day-time amplitude is ~ 5 times the minimum night-time amplitude
24 Hours
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
10 BROOKHAVEN SCIENCE ASSOCIATES
Green Field Vibration Studies- Locations
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Green field vibration measurements were made at a number of locations during the day.
The term ‘greenfield’ was originally used in construction and development to reference land that has never been used (e.g. green or new).
11 BROOKHAVEN SCIENCE ASSOCIATES
Green Field Measurements
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
The vibration amplitude and short term time variation decreased with increasing distance from the LIE. The BNL East location were found to have the lowest vibrations that were measured.
(nm
)
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NSLS-II Vibration Studies LIE Car Count
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
13 BROOKHAVEN SCIENCE ASSOCIATES
Absolute Floor Vibration and Traffic Count
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
LIE Traffic Count Data 6/24/09-6/25/09 (DST)
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RMS Floor Motion (2-100 hz) and LIE Traffic Count vs TimeCenter of Each Pentant
Pentant 5 Cell 19 Wednesday 1/9/13-Thurs. 1/10/13
Pentant 4 Cell 13 Friday 1/11/13-Saturday 1/12/13
Pentant 3 Cell 7 Wednesday 1/16/13-Thursday 1/17/13
Pentant 2 Cell 1 Friday 1/18/13-Saturday 1/19/13
Pentant 1 Cell 25 Friday 1/4/13-Saturday 1/5/13
LIE Traffic Count
LIE Traffic Count
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• Although the traffic data is from 2009, the current year’s basic traffic profile is expected to be similar.
• One possibility is that the main contribution to the increased vibrations is from heavy vehicles traffic, which may have a different time profile.
• DOT does not keep separate counts for heavy vehicles. • In June 2014, a private firm Tri-State Traffic Data, Inc. was contracted
to record and analyze via camera and software the east and west bound traffic on the LIE between exits 68 and 69.
• The traffic in each direction was further separated into 3 categories – motorcycles, cars or light trucks, and large trucks.
• Vibration measurements were carried out in parallel with these traffic count studies to facilitate a direct comparison of the vibration and traffic time profiles.
SR Floor Motion and Traffic Count
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
15 BROOKHAVEN SCIENCE ASSOCIATES
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Experimental Floor Vibrations Levels vs LIE Total Traffic Count
It’s obvious that the total traffic is uncorrelated to the vibration levels seen on the experimental floor.
16 BROOKHAVEN SCIENCE ASSOCIATES
0102030405060708090100
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RMS 2-100 Hz NSLS-II Floor EastBound Trucks
Exper. Floor Vibration Levels vs LIE Eastbound Truck Count
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
The eastbound truck traffic shows a peak in the morning consistent with the vibration pattern but does not explain the second vibration peak in the afternoon.
Truck traffic peak and vibration peak @ 9AM
Second vibration peak @ 3 pm
17 BROOKHAVEN SCIENCE ASSOCIATES
Exper. Floor Vibration Levels vs LIE Westbound Truck Count
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
The westbound truck traffic shows a peak in the afternoon consistent with the vibration pattern. The westbound traffic persists beyond the time the vibration levels have been reduced, It’s possible the westbound trucks are empty and do not contribute significantly to the vibration levels.
Truck traffic peak and vibration peak @ 3 PM
Vibration levels have dropped
18 BROOKHAVEN SCIENCE ASSOCIATES
-1.5
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oher
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CorrRe(0-1) CorrIm(0-1)
NSLS-II Studies 2-ID Correlation Measurement 0’ Separation Between Seismometers on Floor
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Courtesy of A. Jain
19 BROOKHAVEN SCIENCE ASSOCIATES
Integrated RMS displacement
Correlation between the two magnets Vibration measurement taken on two
farthest magnets on a single girder.
Good correlation between the two points for frequencies below 25 Hz
Relative Integrated RMS motion (vertical) between the magnets 2-100 Hz = 8 nm ;
Meets specification of < 25 nm.
5 m
NSLS-II Vibration Studies Relative Motion Between Magnets on a Single Girder-G4
Girder- Cell 7 G-4
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
0.00.10.20.30.40.50.60.70.80.91.01.11.2
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or C
oher
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1E-04
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Inte
g. R
MS
Dis
p.-V
(µm
)
Frequency (Hz)
Magnet1
Magnet2
Magnet1-Magnet2
20 BROOKHAVEN SCIENCE ASSOCIATES
Correlation Plot Vibration measurement taken on two farthest magnets
on two separate girders: Cell 7, G2 and G4 Good correlation between the two points for frequencies
below 5 Hz Relative Integrated RMS motion between the magnets 2-
100 Hz = 28.8 nm,
Meets Girder-Girder Specification < 70 nm.
13 m
NSLS-II Vibration Studies Relative Motion Between Magnets on Two Separate Girders
Integrated RMS displacement
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
0.00.10.20.30.40.50.60.70.80.91.01.1
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oher
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p.-V
(µm
)
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Magnet2
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21 BROOKHAVEN SCIENCE ASSOCIATES
NSLS-II Vibration Studies - Floor Motion Correlation
~ 13 m
• Floor motion correlated up to 4-5 Hz over a distance of ~ 13 m. • Preliminary data indicated good floor motion correlation below 2 Hz over a distance of 30 m
(covering one cell length). • Vibration amplification factor, from floor to girder/magnet in 2-100 Hz is approximately one. • Above 2 Hz, relative motion between magnet-magnet and girder-girder are within
acceptable limits. •
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
22 BROOKHAVEN SCIENCE ASSOCIATES
NSLS-II SR Tunnel Thermal Stability
Locations of the Temperature Sensors
Temperature Stability Specifications: • ± 0.1 ºC in time with 1-hour cycling. (Time) • ± 1 ºC over the entire tunnel. (Space) • 0.1 ºC/m Gradient
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
23 BROOKHAVEN SCIENCE ASSOCIATES
24.0024.1024.2024.3024.4024.5024.6024.7024.8024.9025.0025.1025.2025.3025.4025.5025.6025.7025.8025.9026.00
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20130508 Temperature Run Pentant 1 Temperature vs Time 1 Hour Period
RTD1RTD2RTD3RTD4RTD5RTD6RTD7RTD8RTD9RTD10RTD11RTD12RTD13RTD14RTD15RTD16RTD17RTD18RTD19RTD20RTD21RTD22RTD23RTD24RTD25RTD26RTD27RTD28RTD29RTD30
0.1⁰C
2013 Temperature Stability in Pentant 1
Temperature variation over entire pentant = ±0.75C
A study at APS showed a strong correlation between temperature and corrector strength which led to an upgrade in their temperature control system.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
SR tunnel temperature meets the full specification.
24 BROOKHAVEN SCIENCE ASSOCIATES
2017 Temperature Stability in Pentant 2
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Current data shows a stability of 1.4 degrees which is clearly out of specification range. This is under investigation and could be a temperature control feedback issue.
1.4 Degree F
25 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Vibration Studies from 2011-2016 • SEB2 Building • Bldg 703 Lab • 23-ID- 90 mm dipole and vacuum chamber • 2-ID Monochromator • NSLS-II All pentants and service buildings • NSLS-II Mezzanine • 23-ID Chiller • Bldg 725 Computer Room • NSLS-II Cooling Tower • SLM Diagnostic girder • NSLS-II XBPM • Green field locations • X-Y Slit stages
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
26 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies NSLS-II SR Floor and Girder
Spike in vibration data at 2:30 A.M. Previously thought to be hardware/software glitch.
24 Hours
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
27 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies- RMS Displacement vs Time 1/15-1/16 Data taken in the SR Floor in Pentant 3 Cell 7
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20140115P3CELL7_B RMS Displacement vs Time 1/16/14-1/17/14
23 minute duration
21 minute duration
10 minuteduration
16 minute duration
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
28 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies- Increased Acquisition Time to 57 Minutes RMS Displacement (2-100 Hz)= 151 nm
Large Vibration duration= 12 minutes
• The duration and shape of the large vibration suggests a moving vibration source that approaches close to the BNL site and then moves farther away.
• This suggests a freight train.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
29 BROOKHAVEN SCIENCE ASSOCIATES
Date Time Interval Probable Train12/4/2013 9:29-9:34 PM LIRR Leaf Crusher Eastbound12/5/2013 12:27-12:32 AM NYA RS-60 Eastbound12/12/2013 12:11-12:23 AM NYA RS-60 Eastbound12/12/2013 1:30-1:38 AM NYA RS-61 Westbound12/12/2013 2:44-2:50 AM LIRR Leaf Crusher Westbound
BNL Site Studies Investigating Source of Intermittent Late Night Vibrations on the NSLS-II SR Floor
•New York & Atlantic Rail (NY & A) who run the freight trains on the LIRR lines were contacted. •The freight train schedule is irregular but usually runs between the hours of 12- 3 AM. •Dates and the time intervals in question were sent to them. •Five out of five large vibration intervals matched their freight train schedule.
*
* * A leaf crusher train is used to wash and clean the tracks of an oily residue left by crushed leaves on the rail.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
30 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies - IR Video Capture of LIRR Close to BNL
IR Camera 1 IR Camera 2
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
IR cameras positioned about 50 feet away from tracks on BNL property. Simultaneous vibration data was taken on experimental floor.
31 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies -Vibration Levels Measured on Experimental Floor and Timings of Various Types of Trains Passing Close to BNL Site.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
32 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies NSLS-II Effects of Shaker On 17-BM Experimental Floor
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Goal: Measure increase of RMS displacement of Experimental floor due to presence of chiller. Chiller cycled on and off every half hour.
Shaker Location in sample prep area
Geophone location near 17-ID hutch
Shaker
Steel table
Sercel Geophones
Distance between seismometer on floor next to shaker and the 17ID floor location is 25’
Vert Vert Horiz Horiz
DateTime Shaker Status Floor-17ID Floor Floor 17-ID Floor
2017/05/10 09:15:24 ON 117.8 108.2 49.2 57.12017/05/10 09:24:45 OFF 123.4 117.0 45.7 60.9
Note: Variation in absolute displacement over time is due to local disturbance and/or cultural background vibration source, ie, LIE truck traffic, local traffic, freight trains.
Conclusion: No dramatic increase in floor vibration when shaker is turned on.
33 BROOKHAVEN SCIENCE ASSOCIATES
1E-04100 150 200 250 300In
teg.
RM
S D
ispl
acem
ent
(µm
)Frequency (Hz)
Vertical Horizontal
_ _ _
BNL Site Studies NSLS-II Cell 25 Experimental Floor
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
A noise spike at a frequency of 250 Hz was seen at cell 25 in the NSLS-II ring by the accelerator physics group. Goal: A vibration study was undertaken to see if this was observed on the experimental floor adjacent to cell 25
Conclusion : 250 Hz signature it is not coming from natural ground motion but probably induced from an unknown source.
1E-071E-061E-051E-041E-031E-021E-011E+001E+011E+02
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t (µm
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Examination of the RMS displacement does reveal there is a small sub-nanometer vertical disturbance at 250 Hz. (circled in red)
34 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies NSLS-II 3-ID HXN Goal: HXN 3-ID Experimenters are seeing a 0.13 Hz noise spike that is affecting their imaging resolution. Previous data taken in Pentant 3 Cell 7 with a Gurlap seismometer with a very low bandwidth (0.008 Hz) was examined.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
According to C. Montag (BNL) & J. Rossbach (DESY) , this ‘7 second hum’ appears in all spectra at various labs around the world and is a ‘Microseismic peak around 1/7 Hz; caused by ocean waves hitting coasts.’- Handbook of Accelerator Physics and Engineering, Chao,et al. A spike is seen at a frequency of 0.12 Hz
1.00E-151.00E-141.00E-131.00E-121.00E-111.00E-101.00E-091.00E-081.00E-071.00E-061.00E-051.00E-041.00E-031.00E-021.00E-011.00E+00
0.1 1 10 100
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grat
ed V
ertic
al R
MS
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plac
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Integrated RMS Vertical Displacement vs FrequencyPentant 3 Cell 7 (20140225_105008)
Ch0
0.12 hz
Guralp Upper Bandwidth Limit =50 HzLower Bandwith Limit= .0083 Hz
35 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies NSLS-II 11-BM Vibration Study
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Goal: Study the vertical vibration signature on the 11BM FOE and Hutch during the maintenance period to locate the source that’s causing a 200 micron fluctuation of the beam at rate of a 1 Hz during operations.
Conclusion : The spring-loaded screws for the kinematic mount for the 1st crystal were tightened resulting in the dampening of the vertical motion.
Before After
Measurements taken along the entire length of the beamline from the Front End to the sample chamber did not reveal a 1 Hz frequency.
11-BM Layout
(Photos taken from video - courtesy of Masafumi Fukuto)
36 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies NSLS-II SEB 2 Floor
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
Goal: Study the vertical vibration signature on the SEB2 floor in the approximate location of the future source and target for a two week period.
Seismometers were located 13.1 M apart between source and target locations.
Conclusion : Vibration results led to a re-design of the experiment.
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SEB2 Floor RMS Displacement 2-100 Hz vs Time 11/17/14-12/1/14Seismometer Separation Distance =13.1 M
Ch0 Detector
Ch1 Sample
Monday Tuesday Wednesday Thursday Friday Saturday Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sunday Monday
Thanksgiving Day
Lab Closed
Black Friday
Vertical displacement varied from 15 to 100 nm (not counting vibration spikes)
37 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies- SIX Spectrometer
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
(Courtesy of Ignace Jarrige)
38 BROOKHAVEN SCIENCE ASSOCIATES
BNL Site Studies- SIX Spectrometer
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
(Courtesy of Ignace Jarrige)
39 BROOKHAVEN SCIENCE ASSOCIATES
Detected Sources of Instabilities • Lunar Tides • Wind • Local automobile traffic • LIE truck traffic • Freight train traffic • People • 60, 120 Hz noise • Vacuum pumps • Water flow • Air temperature fluctuations
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
40 BROOKHAVEN SCIENCE ASSOCIATES
Mitigation Techniques • Perform vibration and thermal studies before the installation of
equipment as was done with the SIX spectrometer. • Re-pave BNL roads and portions of the LIE if possible. • Implement mechanical vibration reduction techniques on beam
components (tables, XY Stage, stands, BPMs, etc). • Redesign/reroute plumbing and adjust water flow to minimize
mechanically induced vibrations. • Pour deeper foundations to minimize vibrations. • Minimize equipment with high heat load (power supplies, etc) • If specifications change or traffic increases in the future, other mitigation
techniques should be studied.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
41 BROOKHAVEN SCIENCE ASSOCIATES
Future Developments • Develop a non-contact interferometer-based inertial displacement
sensor that can feed the BPM motion information to the control system in real time to compensate for ground motion.
• As a first step, implement a BNL vibration early warning system for experimenters which would be used to insure the data they are taking is valid.
• Eventually develop a permanent vibration monitoring system throughout the BNL site available to all scientific facilities and users.
• Installation is underway to install permanent RTDs in tunnel floor above the vehicle tunnel to study the temperature gradient in the concrete slab.
• Install permanent thermal sensors to study temperature fluctuations inside and outside of buildings.
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
42 BROOKHAVEN SCIENCE ASSOCIATES
The End
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
43 BROOKHAVEN SCIENCE ASSOCIATES
Supplemental Slides
Electron and X-ray Beam Stability Review, January 18-19, 2018, Brookhaven National Laboratory, Upton, NY
44 BROOKHAVEN SCIENCE ASSOCIATES
Courtesy: Animesh Jain, Superconducting Magnet Division, BNL , (3/20/2013) Electron and X-ray Beam Stability Review, January 18-19, 2018,
Brookhaven National Laboratory, Upton, NY
45 BROOKHAVEN SCIENCE ASSOCIATES
Courtesy: Animesh Jain, Superconducting Magnet Division, BNL, (3/20/2013) Electron and X-ray Beam Stability Review, January 18-19, 2018,
Brookhaven National Laboratory, Upton, NY
46 BROOKHAVEN SCIENCE ASSOCIATES
Courtesy: Animesh Jain, Superconducting Magnet Division, BNL, (3/20,2013) Electron and X-ray Beam Stability Review, January 18-19, 2018,
Brookhaven National Laboratory, Upton, NY