Download - MONALISA at ATF2 First installation report
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Wed 15 Jul 2009 ATF2 weekly meetingOxford MONALISA
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MONALISA at ATF2 First installation report
15 July 09
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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
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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
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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
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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
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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)
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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
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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
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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
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Tilt sensor• Tilt change on Shintake ~5+5 rad
– After MONALISA DBS installed at IP
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DBS pumped out: with rods in
• Reached 28 Pa with a different pump– vacuum integrity was unaltered
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Forces measured pumping down when mounted at ATF2 IP
Regulator cycle ~225 s
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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
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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.