applied geodesy group survey and alignment of the ilc an approach to cost calculation and network...

Applied Geodesy Group

Survey and Alignment of the ILCAn approach to cost calculation

and network simulations

VLCW06 Vancouver, British Columbia, July 2006

Johannes Prenting, Markus Schlösser,

DESY

J. Prenting, M. Schlösser Geodesy @ DESY July 2006

INTRODUCTION

ACCURACYCALCULATION

SURVEY & ALIGNMENT ISSUES FOR I LC

COST CALCULATION

LC Survey Challenge

Survey = multi step process with single tolerance budget driven by accelerator physics:

component construction component fiducialisation component survey machine alignment

Components Survey:

200µm vertical, 500µm horizontal = our slice of tolerance budget

over some 100m = O (betatron) wavelenght

INTRODUCTION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

accuracyrequirements met?

possible surveysolution for

XFEL

economicrequirements met?

surveysolution found

no

yes

no

yes

solutionunusable

solutionunusable

ILC

INTRODUCTION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION



XFEL



no

yes

no

yes

solutionunusable

solutionunusable

ILC

Accuracy demands:Linac:

transversal : s module =0.5mm, s cavity =s quad=0.3mm, s BPM = 0.3mm

vertical : s module =0.2mm, s cavity =s quad=0.2mm, s BPM = 0.2mm

over a range of some 100m length.

Injector: ??

damping rings: ??

beam delivery system: ??

final focus: ??

machine detector interface: ??

INTRODUCTION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION



XFEL



no

yes

no

yes

solutionunusable

solutionunusable

ILC

Accuracy demands:Linac:




Injector: ??

damping rings: ??

beam delivery system: ??

final focus: ??

machine detector interface: ??

What can we achieve with classical survey methods?

INTRODUCTION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

ACCURACYCALCULATION

Simulation of an ILC-tunnel network

The following basic assumptions have been made:

NO refraction (!), only the geometrical standard deviations have been taken into account. Refraction can – of course – make a much bigger error than shown here.

Lasertracker: sigma horizontal=0.15mgon, sigma vertical=0.15mgon, sigma distance=0.015mmTacheometer: sigma horizontal=0.3mgon, sigma vertical=0.3mgon, sigma distance=0.15mm

The FULL tunnel network consists of “rings” of 12 reference points (figure 1) which are located in cross-sections of the tunnel. These rings are positioned every 10m through the whole tunnel. Instrument stands are in the middle between two rings (figure2)

Observations are made from each instrument stand to the next two rings forward and backward. So one instrument stand generally consists of 48 measured points (figure 2) or 3*48=144 observations (horizontal and vertical angle and distance).

Reference „rings“, equidistance 10m

observations

figure 2: ground plan (FULL) with reference rings,instrument stands and observations

reference pointslasertracker or

tacheometer

figure 1: cross section of tunnel (FULL)


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

ACCURACYCALCULATION

Simulation of an ILC-tunnel network

When looking at existing accelerator tunnels the assumption, that a complete cross-section is available for the reference networks, seems rather optimistic. A more realistic approach would be that one half of the tunnel is permanently blocked by other installations. That leads to the following HALF tunnel network:

reference „rings“, equidistance 10m observations

otherinstallations

lasertracker or tacheometer

reference points

figure 3: cross section of tunnel (HALF) and instrument

figure 4: ground plan (HALF) with reference rings, instrument stands and observations


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

ACCURACYCALCULATION

Tacheometer: sigma h=0,3mgon, sigma v=0,3mgon, sigma d=0,15mm

full X-section available, (3mx3m)


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

ACCURACYCALCULATION

Tacheometer: sigma h=0,3mgon, sigma v=0,3mgon, sigma d=0,15mm

half X-section available, (1.5mx3m)


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

ACCURACYCALCULATION

Lasertracker: sigma h=0,15mgon, sigma v=0,15mgon, sigma d=0,015mm

full X-section available, (3mx3m)


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

ACCURACYCALCULATION

Lasertracker: sigma h=0,15mgon, sigma v=0,15mgon, sigma d=0,015mm

half X-section available, (1.5mx3m)


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

angle of refraction

dssDDR

z

s

P

P

rad

)(][

mit = a = konstantyn

n = refractive index = local refractive coefficient

= f(P,T, ) f( )yT

yT

approximation equations

dsy

ndsy

n DP

P

rad

z

s

0

][2

2][

Darad thus and

8

2Daz

Achievable accuracy with conventional methods

in this application mainly depends on the

ACCURACYCALCULATION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

yT

Numerical examples for various

Entfernung Richtungsfehler Querabweichung Richtungsfehler Querabweichung[m] [mgon] [mm] [mgon] [mm]50 0,16 0,031 -0,10 -0,020

100 0,32 0,125 -0,21 -0,081150 0,48 0,281 -0,31 -0,183200 0,64 0,500 -0,41 -0,325250 0,80 0,781 -0,52 -0,508300 0,95 1,125 -0,62 -0,731600 1,91 4,500 -1,24 -2,9251200 3,82 18,000 -2,48 -11,700

Vergleich HöhenmessungSeitenrefraktion

mK

yT 065,0

m

Ky

T 1,0

distance angular error lateral error angular error lateral error

lateral refraction Comparison with altimetry

Standard solution to minimize effects of refraction: monitoring pillars alternating on either side of the tunnel.

=>Conventional optical methods not suitable here.

ACCURACYCALCULATION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

Complex & irregular layout of machine: Horizontally and vertically curved sections, (Rmin>500m) Some sections geometrically straight, others following geoid Sections with significant slopes

Many different sections (Linac, DR, BDS, FF, MDI) Possibly various beamlines in one tunnel Temp. & pressure gradients in tunnel Very tight working space (1m wide) Space serves as emergency escape route

Optical Survey methods are not precise enough for reference structureNeed new instrument RTRS (Rapid Tunnel Reference Surveyor)

• Provides regular reference structure• Uses regular markers at tunnel wall

• No long-term stable (>months) reference monuments at O(10 m) level• Need frequent surveys• Need automated process

LC Survey Challenge

Best solution is to split up the survey procedure into • a reference survey (along the tunnel)• and a stake out

transfers coordinates to the machine over short distances across the tunnel

ACCURACYCALCULATION

CONSEQUENCES


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION



XFEL



no

yes

no

yes

solutionunusable

solutionunusable

ILC

Accuracy demands:

Linac:




LiCAS: ~40µm transversal, ~100µm vertical

ACCURACYCALCULATION

CONSEQUENCES


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

Cost calculation (of reference system)

TCORef = Racc nsurv Lacc Tsd (ksd + Csurv) + Isurv + M surv

Racc : Lifetime of accelerator [years]nsurv : Number of surveys per year [1/year]Lacc : Length of accelerator [km]Tsd : SD-time required for 1 km survey [days/km]ksd : cost per shutdowntime [€/day]Csurv : cost of survey team(s) [€/day]Isurv : Investment costs for survey system [€]M surv : Maintenance costs for Survey instruments [€]

COST CALCULATION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

Cost calculation (conventional optical survey w. Lasertracker, 10 teams)

Racc : 20 yearsnsurv : 1.2 / yearLacc : 33 kmTsd : 5 days/kmksd : 800.000 € / dayCsurv : 1.120 € / dayIsurv : 100.000 € / teamMsurv : 2.500 € /instr./year

TCORef = 322 Mill. € (& 1.7 years downtime)COST

CALCULATION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION

TCORef = 90 Mill. € (& 99 days downtime)

Cost calculation (RTRS, 1 train)

TCORef = 0.8 Mill. € + 170 days downtime

Cost calculation (conventional optical survey w. Lasertracker, 40 teams)

COST CALCULATION


INTRODUCTION

ACCURACYCALCULATION


COST CALCULATION



XFEL



no

yes

no

yes

solutionunusable

solutionunusable

ILC

Economic requirements:

RTRS

Accuracy demands:

Linac:




LiCAS: ~40µm transversal, ~100µm vertical -> see talk of G.Grzelak

COST CALCULATION

Applied Geodesy Group

Survey and Alignment of the ILCAn introduction to the concept and open

questions

Johannes Prenting, Markus Schlösser, DESY

Thnx for your attention !

VLCW06 Vancouver, British Columbia, July 2006

applied geodesy group survey and alignment of the ilc an approach to cost calculation and network...

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