monalisa at atf2 first installation report
DESCRIPTION
MONALISA at ATF2 First installation report. 15 July 09. Overview. Installation progress ATF2 roof: Initial tests with wooden frame Initial test results ATF2 FF: Mounted at IP in Final Focus Vacuum test Force tests Tilt tests Magnet lateral movement tests. Good progress. - PowerPoint PPT PresentationTRANSCRIPT
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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MONALISA at ATF2 First installation report
15 July 09
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Overview
• Installation progress– ATF2 roof: Initial tests with wooden frame
• Initial test results
– ATF2 FF: Mounted at IP in Final Focus• Vacuum test• Force tests• Tilt tests• Magnet lateral movement tests
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Good progress• We kept within our proposed schedule
– As set out in ATF2 meeting 17 Jun 09
• All items arrived at KEK 1st July 2009– Brought to ATF2 roof within 15 mins of arrival
• On ATF2 roof– System assembled and retested
• Brought to ATF2 Final focus tunnel – Reassembled at IP Thursday 9th July and
tested
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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On the roof of the ATF2
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Preliminary tests
• Closed the vacuum system– Pumped out to 25 Pa– Limited by small leak (1 Pa/s)
• Due to lower angled tube• Will be fixed in future by
replacing lower angled tube• Vacuum sufficient for test
programme
• Reassembled wooden frame on ATF2 roof
• Benoit measured vibrations (see his talk)
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Schematic Layout of Pneumatics • Vacuum in end boxes connected through inner bellows• High pressure only connected to outer bellows chamber
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Recalibrated force sensors
• Retested force sensor – Applying loads using spring balance
• Force sensor rather noisy– Produces signals up to +/- 10 mV
• Readout with NI USB 6009 ADC (14 bit)– Sampled at 5kSa/s– Used LabVIEW to average 5000 readings
together
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Forces on frame during pumping
• Cycled bellow chamber pressures– Inner chamber 100 kPa to 25 Pa to 100 kPa– Outer chamber 100 kPa to 140 kPa to 100kPa
• Measured forces– Using recalibrated force sensor
• Independently calculated forces– Based on SMC pressure sensors
• One for each chamber
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Sensor readout during pumping
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Over-pressure regulation• Over-pressure regulator does not behave
as we would like
Control Signal /V
Overpressure / kPa
0
40
Vmax0
No response for over-pressure requests less than (50 mbar)
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Required over-pressure regulation• Would want a straight line relationship
even for very low over-pressure
Control Signal /V
Overpressure / kPa
0
40
Vmax0
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Into the ATF2 tunnel
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Tunnel preparation
Terunua-san installed pipe across the inside of the ATF2 final focus tunnel roof
Equipped with 2 hoists
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Mounting Shintake components• Plate mounted using M30 hooks
• End box mounted using hoist
Cables
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Mounting QD0 end box• Beeswax was placed on QD0 surface
– To ensure good vibration coupling to magnet
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End boxes mutually aligned
• Laser light projected along accelerator axis
• Shintake end box – (left-right adjustable)– Moved to match QD0
end box
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The DBS was hoisted into placeFull assembly completed well
within one day
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Tilt sensor• Tilt change on Shintake ~5+5 rad
– After MONALISA DBS installed at IP
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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DBS pumped out: with rods in
• Reached 28 Pa with a different pump– vacuum integrity was unaltered
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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Forces measured pumping down when mounted at ATF2 IP
Regulator cycle ~225 s
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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(x,y,z) Physicists coordinates• In the following we’re using the physicists
coordinate frame
Y
X
Z
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Tracking QD0 motion in Z• Set MONALISA at operational pressure
– Pumped out vacuum vessel– Over-pressure in outer bellowed chamber
• Set up independent tracking of QD0– Used FARO to survey QD0 position changes– Keyence laser meter tracked QD0 mounted
on SD0 base plate
Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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KEYENCE tracking QD0 Z
Readout sensor in mV
10 V = 5 mm
1 mV = 0.5 m
Readout with ourADC/LabVIEW DAQ
QD0
Supported from SD0
KEYENCE
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FARO survey instrument
FARO
Retro
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Comparison of FARO & KEYENCE
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FARO compared with KEYENCE
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FARO tracking X and Z
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Tracking QD0 motion in Z
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Tracking QD0 motion in X
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Left-right QD0 mover tests
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Left-right QD0 mover tests
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Left-right QD0 mover tests
DBS spring constant is small enough to let QD0 move freely
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What to learn from this measurements?
• We are told that static tolerances for QD0:– 100μm in x,y,z
• Our measurements show that even with the current pressure control system we meet this tolerance.
• The low spring constant of the DBS allows the QD0 mover to move the magnet unhindered.
• Dynamic tolerances: vertical: 10 nm, (between Shintake and QD0) horizontal: 500 nm
along beam: 10 μm• The question about dynamic motion and impact on the
Shintake table will be answered in the next two talks.
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Summary & Outlook
• MONALISA vacuum system worked well– Many thanks for the wonderful support we got!
• The next step is to do optics tests with the vacuum system in place to gain calibration constants.
• Our goal is to get first position measurements to the Shintake group late next spring.