Strategy of detector solenoid construction

Yasuhiro Sugimoto

KEK

2013/5/28@ECFA2013

1

Introduction

• Among the detector components to be transported to the cavern, superconducting solenoid is the biggest one, and the construction method gives impacts to other issues of ILC– Surface assembly hall design– Road, tunnels, bridges, and port for the access to

the central region– Overall schedule

• Strategy of detector solenoid construction should be determined as soon as possible

2

Solenoid design

• Global parameters

ILD SiD

Coil outer radius [mm] 3970 3112

Coil length [mm] 7350 5586

Cryostat outer radius [mm] 4400 3392

Cryostat length [mm] 7810 6066

Cold mass [t] 168 130

Number of modules 3 2

Module length [mm] 2450 2793

Module weight [t] 56 65

Winding layers 4 6

3

Coil winding option 1

• Winding at a factory– Each module is made at a factory– Modules are transported to the surface assembly

hall on site, and assembled into one solenoid– Merits

• Construction of modules can be started before completion of the assembly hall construction

• We don’t need winding machine in the assembly hall less space is needed for the assembly hall

– Demerits• Module transportation issues

4

Coil winding option 2

• Winding on site– Superconducting cable is made at a factory– Spools of SCC for one layer of one module (2.6km for

ILD) is transported to the assembly hall on site– Coil winding and assembly of modules in the assembly

hall– Merit

• No transportation issue (a spool of SCC is much smaller than a coil module)

– Demerit• We have to wait for the completion of the assembly hall

construction on site

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Transportation issue

• Coil modules are large (f8mx2.5m for ILD) and heavy (65t for SiD)

• Access road (and tunnels) should be wide enough and bridges should be strong enough

8m

2.5m

8m

4m

3.8m

Solenoid module Anti-DID module 6

Access to the site

• A possible route for Kitakami site (street view available for >50%)

Bypass road under construction

Port

IR

© Google7

Access to the site

• Present bottle neck will be solved by the bypass road

© Google

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Access to the site

• Tunnel looks OK

© Google 9

Solenoid construction method

• Y.Makida and T.Okamura discussed construction of superconducting solenoid with people of a company

• Suggestions of the company– Both options are feasible– They showed a construction time line which is much

longer than we expected Coil winding on site has a risk of delay of overall schedule

– Coil winding on site might require an additional machine tool to make the mandrel cost increase

• They prefer coil winding at the factory rather than winding on site

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ID Name

1 Project approval2 CFS final design3 Bidding4 Ground breaking5 Underground cavern6 Access tunnel7 Cavern excurvation8 Exp hall interior/ facilities9 Exp hall ready10 Work off site11 Solenoid final design12 Bidding13 Winding machine14 SC cable15 Coil modules16 Work on surface17 Assembly hall construction18 Toolings for solenoid assembly19 Solenoid assembly/ surface test20 Modules of iron yoke (YB0) pre-assembly21 Modules of iron yoke (others) pre-assembly22 Assembly of detector modules23 Work uderground24 Iron yoke (YB0) assembly25 Cryogenics26 Solenoid transfer/ install27 Solenoid underground test28 Detector (CAL) install29 Field mapping30 Detector (tracker/ forward) install31 Detector checkout/ roll in32 Detector ready

01/01

12/29

06/30

12/31

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TD R

A possible scenario

TDR

TDR

Sub-det. construction off site

Det

ect

or P

ropo

sal

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Conclusion

• There are two options of superconducting solenoid construction: winding on site or winding at a factory

• Both options are feasible• Coil winding at a factory seems less risky and

preferable• Detailed dimensions of access road/tunnels should

be confirmed• More discussion on the time line is necessary

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