Facility Advisory Committee BFW Calibration Test Results
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Transcript of Facility Advisory Committee BFW Calibration Test Results
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 1
Facility Advisory CommitteeBFW Calibration Test Results
on behalf of:
Jim BaileyKeith Caban
Clive FieldGeovanni Gordon
Tom NakashimaDanny Peterswright
Reggie RogersDonald Schafer
Yung-Yung Sung
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 2
BFW Assembly Mounted on Adjustable Support
Adjustable Mounting Support
(Modified since) Vacuum Pump Connector (2.75” Conflat Flange)
Card Position Monitor (Limit switches)
Air Supply Shut Off Valve
Pneumatic Solenoid Valve
Precision Screw
Electrical Connectors for Wire Signals
Vacuum Chamber Connection Flange
(NW-50 CeFix w/Clamp)
Beam Port
Pneumatic Cylinder
Alignment Fiducials
Frame
Compression Spring Positioner
Potentiometer
Housing
Assembly model courtesy: J. Bailey, ANL
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 3
BFW Card: Physics Overview (PRD 1.4-004-r1)
Parameter Value Status
Wires per BFW device 2 2
Wire perpendicularity 10 mrad ~1 mrad (early microscope test on prototype)
Wire diameter 0.03-0.04 mm 0.0345-0.0413 mm Carbon wires.
Vertical position of Y-wire from Girder Axis (GA) 0.20 mm 0.1899 mm [Sample average, BFW #7]
Horizontal position of X-wire from GA 0.40 mm 0.412 mm [Sample average, BFW #7]
Vacuum hardware clearance radius at target >2 mm >2 mm
Two independent methods to measure beam intensity at wire location: (1) beam induced wire current (2) Scattered particles
NA Only scattered particle detection in plan
Y-wire vertical insertion reproducibility 30 µm 1 µm [Sample RMS, BFW #7]
X-wire horizontal insertion reproducibility 65 µm 19 µm [Sample RMS, BFW #7]
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 4
Task Status/Dates (6/17/08)
Delivery of BFW assemblies from ANL11 revised design BFWs received at SLAC (+2 old design). 2 more shipped as
of 6/9/08
Fabrication of Bench Assembly for SLAC Alignment of BFW Used for alignment of BFWs
BFW electrical connections Electrical connections, ground connectors and RF shields: All RFI
Fabrication of 40 BFW cards (Macor) RFI
BFW Card Coating – Kovar (40 pieces) RFI
BFW Card Wiring – Carbon wire, 40 pieces RFI
BFW Card Installation and alignment RFI
BFW Assembly Pneumatics Boxes Put in system by P. Cutino for 33 BFW
90 psi airline Put in system by P. Cutino for 33 BFW
BFW Additional non-wired cards7 BFW cards fabricated, cleaned and coated. Waiting to be wired if needed.
BFW: Alignment & Assembly Status
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 5
BFW: Alignment & Assembly Status
Shipped from Argonne
Total Received at SLAC
In Transit
RFI QC Testing in process
Awaiting QC
Awaiting retesting
Old design BFWs
15 13 2
(#16,17)
7
(#4,5,6,9,7,12,29)
1
(#24)
2
(#15,32)
1
(#13)
2
(#1,2)
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 6
BFW Card Prototype DrawingPrototype material: Al-6061Actual material: MacorThickness: 3/16” (4.8 mm)Coating: Kovar [tooling in progress]
X-wire end point: 39.614 mmBeam center: 40 mmGap between beam and X-wire: 0.386 mm
Y-wire end point: 37.014 mmBeam center: 37.2 mmGap between beam and Y-wire: 0.186 mm
Courtesy: C. Field, R. Rogers
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 7
BFW Card Wiring: Tooling
Copper Tabs
Rods for hanging BFW wire with weights
Micrometer stage
BFW Card
Card holder
‘Carbon wire & weight’
• Wires soldered to copper tabs• Wires from copper tabs connect to BFW feedthrough• Feedthrough to be grounded and RF shieldedCourtesy: C. Field, Y.Sung
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 8
BFW Alignment Procedure at SLAC(outside Vacuum)
• Coordinate system definition• Wire card positioning and alignment• Transformation Factor from BFW tooling balls wire card QC Instruction List
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 9
BFW Alignment Procedure (in Vacuum)
• Wire position found using TB values• Repeatability check• Wire position check in virtual beamline coordinate system
QC Instruction List
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 10
BFW Test: Sample ‘Good’ Data, BFW #7
All Data, courtesy: SLAC QC, E. Lundahl, K. Caban, T. Nakashima
X (<65)
Y (<30)
Wire 19 1
TB5 4 9
TB6 4 10
TB7 3 3
TB8 1 8
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 11
BFW Test: Sample ‘Bad’ Data - old design of BFW #2
X (<65)
Y (<30)
Card Position (before vacuum)
141 156
TB5 31 78
TB6 32 88
TB7 18 75
TB8 18 18
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 12
BFW Test: Sample Data, BFW #12Vacuum Test 1
Measurement Method:• Under Vacuum• 200 cycles, 10 measurements, Random sampling
• Relaxation time between cycles: ~ 1 second
X (<65) Y (<30)
Wire 145 15
TB5 33 76
TB6 33 52
TB7 41 15
TB8 41 55
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 13
BFW Test: Sample Data, BFW #12Vacuum Test 2
BFW #12 RFI-ed• Tested for repeatability at ANL (All units are tested at ANL)• Wire position verified at SLAC• Wire repeatability verified with delayed cycles (small sample size) at SLAC• SLAC Procedure to calibrate devices using small sample size + delayed cycle measurement
X (<65) Y (<30)
ANL Wire Position Repeatability Test (100 cycles)
12 2
SLAC Wire Position (10 cycles) 31 3
TB5 19 22
TB6 18 16
TB7 11 6
TB8 11 15
Measurement Method:• Under Vacuum• Another 10 cycles, 10 measurements, Consecutive sampling
• Relaxation time between cycles: ~ 1 minute
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 14
BFW : Status Reminder
Shipped from Argonne
Total Received at SLAC
In Transit RFI QC Testing in process
Awaiting QC
Awaiting retesting
Old design BFWs
15 13 2
(#16,17)
7
(#4,5,6,9,7,12,29)
1
(#24)
2
(#15,32)
1
(#13)
2
(#1,2)
Process Time per Assembly: ~ 1 day
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 15
¼-20-UNC Screws 1 and 2
¼-20-UNC Screws 3 and 4
This precision screw remains fixed
Socket head screw loosens and tightens collar on precision screws
Socket head for adjusting the precision screws
Top View
X-Precision Screws. Do not touch
Y-Precision Screws 10, 11, and 12
¼-20-UNC Screws 5, 6 and 7 (Brass washers under heads are not
shown)
Assembly model courtesy: J. Bailey, ANL
Venkat SrinivasanFAC: BFW Test Update [email protected]
06/17/2008 16
BFW Assembly (Body Sectioned) Wire Card Down in Inactive Mode
Wire card(Down Position)
Lower Limit Switch(Actuated Position)
Pneumatic Solenoid Valve(Cylinder Vent Position)
Internal Return Spring(Expanded Position)
Electrical Connectors(Down Position)
Internal Kinematic Stop Plates
(Open Position)
Bellows Seal(Compressed Position)
BEAM
Potentiometer (Out Position)
Assembly model courtesy: J. Bailey, ANL