STABILIZATION STATUS AND PLANS

The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD

K. Artoos, C. Collette, R. Leuxe, C.Eymin, P. Fernandez, S. Janssens*

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Outline

Requirements Review status 2012 Plans for 2013, objectives Manpower & collaboration status

Requirements

Stability (magnetic axis):Nano-positioning

3992 CLIC Main Beam Quadrupoles:

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Type 4: 2m, 400 kgType 1: 0.5 m, 100 kg

A. Samoshkin

Main beam quadrupoles

Final Focus

Vertical1.5 nm > 1 Hz

Vertical0.2 nm > 4 Hz

Lateral5 nm > 1 Hz

Lateral5 nm > 4 Hz

Ground motion External forces Flexibility of magnet

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Other requirements

Available spaceIntegration in two beam module620 mm beam heightAccelerator environment- High radiation - Stray magnetic fieldPositioning-Steps of tens of nm +/- 1 nm

Stiffness-Robustness Applied forces (water cooling, vacuum, power leads, cabling, interconnects, ventilation, acoustic pressure)

-Compatibility alignment-Transportability/Installation

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Review status 2012MBQ Stabilisation

Type 1

Collocated pair

X-y proto

Seismometer FB max. gain +FF (FBFFV1mod): 7 % luminosity loss(no stabilisation 68 % loss)

Courtesy J. Snuverink, J. Pfingstner et al.

Main linac Req.: 1.5 nm r.m.s.

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Inertial Reference mass

No stabilization 68% luminosity lossInertial ref. mass 1Hz (V3mod)

11%

Inertial ref. mass 1Hz + HP filter (V3)

3%

Inertial ref. mass 7 Hz (V3 mod 1)

Orbit fb optimised V3: 0.7%

Courtesy J. Snuverink et al.

Stef Janssens

C. Collette

“Comparison of new absolute displacement sensors”, C. Collette et al. , ISMA 2012

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X-y prototype: Nano positioningResolution, precision, accuracy

Capacitive sensor

3 beam interferometer

Optical ruler

Actuators equipped with strain gauges

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X-y positioning: Study precision, accuracy and resolution

The precision required (0.25 nm): • demonstrated with

optical rulers• in a temperature stable

environment • for simultaneous x and y

motion.

Absolute accuracy:• calibrated within 10-8 m

Tests in a temperature unstable environment will be made (ISR re installation)

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X-y Positioning: roll

1&2Parasitic roll

• 2 legs 3 d.o.f. > parasitic roll• Measured with 3-beam interferometer• ~3 μm lateral movement > ~7 μrad

rotation• Early simulations suggest~100

μrad/0.5% luminosity loss (J. Pfingstner)

K.Artoos, Stabilisation WG , 21th February 2013

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2013 Build three “best available design” MBQ

modules

Functional performance testing + development time: Study and try assemblyRequires controlled stable environment (Temperature, Vibrations, Access)Demonstration feasibility + ultimate performanceWater cooling + powering magnet

Test module location not adapted for this.Magnetic measurements and fiducialisation

Type 1 Test module with dummy magnetIntegration in test module, connections to other modules, robust show case, transport, …Demonstration alignment and stabilization but not representative for CLIC tunnel

Type 1 ISR

Type 4 ISR

Type 1 CLEX

Type 4 Test module

MBQ modules upgradable (bolted together, no welds).

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Type 1 and Type 4 mechanical design

FE simulations are doneexpected (good) results

Production plans finished end of next week

K. Artoos, R. Leuxe, C. Eymin

Lateral mode:~139 Hz

Vertical mode:~315 Hz

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Combination of fast positioning and stabilization

Combining positioning and stabilization:

• Making error to requested position R as small as possible

• Additional displacement measurement for low frequency to DC

• Sensors separated in bandwidth• integrator at low frequency to eliminate drift• Simulations function > To be implemented on x-y

prototype

Stef Janssens

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Communication with Control Center

Labview communication program between magnet and simulated control room

Signals out:Geophone/position signalsSDI signal for DIG_POTSSignals in:CS signals for DIG_POTSCLK signals for DIG_POTSNew position X/Y

Signals out:New positionGain FF/FBFilter positionsSignals in:Transfer function (every 5 s)Rel./abs. PositionError signals

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Preparation test modules and CLEX:Two type 1 MBQ and one Type4

• Flexural joints machined. Actuators with amplifiers and sensors delivered January 2013.

• Electronic boards under construction,

• Design Type 1 and type 4 mechanical support ongoing (80% ready)

• Demonstrators T1 and T4 planned for April 2013.

• Issue: Reduction manpower stabilisation MME in 2013

EUCARD deliverable

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Manpower + collaborationstatus

CERN S.Janssens (PhD > Fellow) 100%K.Artoos (100% > 50%)M. Esposito (50%, 12/2012)P. Fernandez Carmona (August 12)Designers: R. Leuxe, C. Eymin (jobs)

MBQ stabilisation + nano-pos.Sensor development

CERN Networking with NIKHEF (PhD Stef, TNO, MI Partners, TU Delft,…) Synergy sensor development with LIGO, VIRGO. Contact Christophe Colette

Action CLIC : new collaboration agreements + K contracts

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Build and test 3 MBQ modules with controller hardwareType 1 ISR + CLEX (precursor PACMAN) Type 4 ISR + Test moduleType 1 Test module

X-Y guide:Continue tests stopped in 2012Test absolute sensorsDevelop and test positioning controllerTest inertial sensors prototypes + stabilisation controller

Vibration measurements module + pulsed dipole correctors

• Outsource: • Construction of adapted sensors

(transfer function, AE compatible, noise level)• Collocated sensor-actuators

If time permits: Ground motion measurements around CMS

Objectives 2013 at CERN

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SPARES

S. Janssens, CLIC Workshop, January 2013

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Controller ElectronicsHybrid Second generation

2 d.o.f. Position input terminal Switchable

(displacement/velocity) Manual or Digital gain/filter

control FPGA control digital part

started Improved radiation hardness

(choice components Tested for SEU and induced

noise at H4HIRRAD

P. Fernandez Carmona

H4IRAD test stand

No damage nor SEU after 18 GyTest not completeReport to be finalized

Piezo amplifier not radhard

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CERN “team”: Build and test 3 MBQ modules Type 1 ISR + CLEX (precursor PACMAN) Type 4 ISR + Test moduleType 1 Test module

Outsource:• Construction of adapted sensors (transfer function, AE compatible, noise level) (in progress)• High stiffness actuators (done)• Collocated sensor-actuators• Characterization existing systems • ? Study pre-isolator Final Focus (Model (almost) done=>Test beam simulations)• High load high range high resolution actuators• Construction electronics (in progress (soldering components))• Implementation of custom digital slow control (in progress)• Construction mechanics: flexural joints, monolithic , machining, assembly,…• Displacement sensors and their implementation (in progress)• Development Radiation hard components

Objectives 2013

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Stabilization with Interferometer based geophone

Interferometer based geophone built and tested:-Very high sensitivity, high resolution-Wider bandwidth-Proof of concept

Issue:

Due to higher bandwidth, actuator slew rate gives instabilities in the loop

-> New batch of actuator amplifiers have a higher slew rate

Measured open loop on x-y guide

Stef Janssens

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Comparison sensors

Sensor Resolution Main + Main -

Actuator sensor 0.15 nm No separate assembly

ResolutionNo direct measurement of magnet movement

Capacitive gauge 0.10 nm Gauge radiation hard Mounting tolerancesGain change w. Orthogonal coupling

Interferometer 10 pm Accuracy at freq.> 10 Hz

CostMounting toleranceSensitive to air flowOrthogonal coupling

Optical ruler 0.5*-1 nm Cost1% orthogonal couplingMounting toleranceSmall temperature driftPossible absolute sensor

Rad hardness sensor head not knownLimited velocity displacements

Seismometer (after integration)

< pm at higher frequencies

For cross calibration

S. Janssens, CLIC Workshop, January 2013

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Five R&D themes :

S. Janssens, CLIC Workshop, January 2013

1. Performance increase →Reach requirements from higher background vibrations + include direct forces

→ Increase resolution (Final focus)

2. Compatibility with environment → Radiation, magnetic field, Operation, Temperature

3. Cost optimization → Standardize and optimize components, decrease number of components, simplify mounting procedures,…

4. Overall system analysis → Interaction with the beam-based orbit and IP feedback to optimise luminosity Integration with other CLIC components

→ Adapt to changing requirements

5. Pre-industrialization → Ability to build for large quantities

S. Janssens, CLIC Workshop, January 2013

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Extra slide:Measured slew rate of actuator

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Bill of Materials

Amplifiers LMP2022MA: Zero Drift, Low Noise, EMI Hardened Amplifier AD8230YRZ:  Zero-Drift, Precision Instrumentation Amplifier AD8691AUJZ: Low Cost, Low Noise, CMOS Rail-to-Rail Output

Operational Amplifier Power regulator ICs: TPS76550, REG1117-2.5, TPS72325,

UCC284-5 FLASH Digital potentiometers: AD5231, AD5204 Diodes: BAV199 Capacitors: Tantalum Resistors: Thin film 1% Potentiometers: Cermet Digital slow control

National Instruments PXI with DAQmx card FPGA: Spartan 6 evaluation board (under development)

S. Janssens, CLIC Workshop, January 2013

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Controller electronics: Hybrid

2 analogue chains+ positioning offset

Local electronics ADCs digitize signalsFor remote monitoring

Communication to remote control center with optical fiber

S. Janssens, CLIC Workshop, January 2013

SPI

P. Fernandez Carmona(until end of August)

S. Janssens, CLIC Workshop, January 2013

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Inertial reference mass proto (v3): With interferometer/with capacitive gauge

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Active Stabilization

B10

No stab. 53%/68%

Current stab.

108%/13%

Future stab. 118%/3%

Luminosity achieved/lost [%]

Machine modelBeam-based feedback

Code

Typical quadrupole jitter tolerance O(1nm) in main linac and O(0.1nm) in final doublet

Final Focus QD0 Prototype

Close to/better than target

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3D simulated Kinematics

M. Esposito, IWAA 2012 Fermilab

PITCH YAW

T1 MBQ

T4 MBQ

• No loss of translation range for T4• About 25% of loss of vertical translation range for T1 pitch• About 80% of loss of lateral translation range for T1 yaw

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Roll simulations

S. Janssens, CLIC Workshop, January 2013

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The influence of the orbit feedback is in general small. For the main linac the tolerance for 0.5% lumi loss is about 100urad (already provided by Daniel before). Including also the BDS without the final doublet, since not actuated by the tripot, (dashed pink curve), the tolerance is about 1um.