MONALISA at ATF2 First installation report

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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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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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.

MONALISA at ATF2 First installation report

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