TARGET HALL OVERVIEW

I. Bailey Cockcroft Institute / University of Liverpool

Recap of Talks from RAL Positron Source Meeting, Sep 2006.

• Andriy Ushakov, DESY

•FLUKA simulations with simple target geometry.

•For baseline design, equivalent dose rate for a Ti ( W) alloy target wheel, 1 week after shutdown, after 5000 hours of running, 1m from wheel is ~170 (120) mSv/h

•NB 65m (43m) of undulator assumed (shorter than baseline).

•Reduction to level of 0.03mSv/h requires ~15cm of Pb shielding

•EU exposure limit is 20mSv/year

• See presentation in tomorrow’s target session.

Remote-handling needed (c.f. 20mSv/h manual worker limit at LHC)

• Tim Broome, RAL– Remote-handling orientation (vertical / horizontal)– Replacement strategy (modular / component)– Required time for exchanging targets?

Recap of Talks from RAL Positron Source Meeting, Sep 2006.

Handling Concepts - Horizontal

Services remain connected, target moved to an integral remote handling cell for replacement.

T. B

roome, R

AL, S

ep 2006

Handling Concepts - Vertical

Services disconnected and target removed to a storage facility. Later can be worked on in a separate remote handling facility

Smaller footprint than horizontal but transfer flasks are required

T. B

roome, R

AL, S

ep 2006

Comments on the proposed target design

• Remote Handling must be considered from the outset

• All service connections have to be remotely handled so choose a system with a minimum of connections

• Consider radiation cooling (to eliminate problems with the water systems (seals etc)

• If water cooling is used why not drive the wheel with the water and eliminate the motor

• Instrumentation is often a key item and can be the life limiting and present a significant remote handling challenge

• It looks like remote vacuum connections will be required. For a 10-8 mbar vacuum this will require development

• Definition of end of life of the target assembly is useful but very difficult

T. B

roome, R

AL, S

ep 2006

• Chris Densham, RAL– The ISIS Horizontal layout used as starting point – Complete target and services system to be on rails

and moved in and out of the beam– Vertical installation may have some advantages

(space, cost) but likely to be slower to change targets (days or weeks - not hours)

Recap of Talks from RAL Positron Source Meeting, Sep 2006.

Single Target Station - Side View

Target module

Remote handling cell

Services trolley(target cooling, cryogenics for solenoids)

Service lines

C. D

ensham, R

AL, S

ep 2006

Target hall layout

50 m

UPT

Target AMD Pre-Acceleration system A (Target module withdrawn into hot cell)

Target AMD Pre-Acceleration system B (in operation)Electron linac

C. D

ensham, R

AL, S

ep 2006

Topic Action Items: D. Target Hall Vinod

Bharadwaj

More activation/damage calculationsIdentify what numbers are needed from the calculationsFigure how to do the simulation – which program(s) etc.

identify people to do the simulationsinclude detailed layout of hardware:

OMD, SW RF, TW RF, solenoids, shielding

Define target hall dimension requirementstarget hall occupancy needsneeded shieldingwhat is in the hall and what is on the surfacescenarios for all the needed repair/replacement operationsKAS target hall

Does ILC plan to have a central hot cell facility? e+ , dumps etc.will it be useful for the positron stuff

Re-visit two/one target requirement (availability, R&R time,……)

Topic Summary - RAL positron source meeting, Sep 2006.

Progress Since RAL meeting

•More sophisticated activation simulations interfacing FLUKA to ASTRA, etc (see Andriy Ushakov’s presentation)

•More sophisticated FLUKA input geometry (L. Fernandez-Hernando, ASTeC, DL)

•Cost driven decision to adopt smaller target hall

•Vertical remote-handling concept (c.f. SNS and PSI) developed by RAL

•Fortnightly remote-handling and activation phone meetings started.

5 cell rf cavity.

e.g. s/c OMD

Target wheel (includes water channel) L. F

ern

an

de

z-He

rna

nd

o,D

L, 2

5/0

1/2

00

7

Drive shaft(includes water channel)

Target Geometry Drawn in SimpleGEO

•A few glitches found in exporting geometries between SimpleGEO and FLUKA.

•Should be able to begin simulations in a few weeks.

Alternative Target Hall Layout

Mini target hall

• 2 target stations

•Surface reprocessing

•~25% of full target hall size (~250m2)

V. B

haradwaj, 17

th October 2006

Alternative Target Hall LayoutV

. Bharadw

aj, 17th O

ctober 2006

Micro target hall

• 1 target station

•Surface reprocessing

•~8% of full target-hall size (~100m2)

New baseline.

Remote Handling and Target Removal

EUROTeV: WP4 (polarised positron source) PTCD task

I. Bailey, J. Dainton, L. Zang (Cockcroft Institute / University of Liverpool)

D. Clarke, K. Davies, N. Krumpa, J. Strachan (CCLRC Daresbury Laboratory)

C. Densham, J. Rochford, B. Smith, M. Woodward (CCLRC Rutherford Appleton Laboratory)

J.L. Fernandez-Hernando, D.J. Scott (CCLRC ASTeC Daresbury Laboratory / Cockcroft Institute)

P. Cooke, P. Sutcliffe (University of Liverpool)

In collaboration with

Jeff Gronberg, David Mayhall, Tom Piggott, Werner Stein (LLNL)

Vinod Bharadwaj, John Sheppard (SLAC)

Target Removal/Replacement Showing Storage CellM

. Woodw

ard, 24th Jan 2007

Beam Pipe

M. W

oodward, 24

th Jan 2007Target Module and Plug with Support Services

Cryocooler

(if required)

+ vacuum pump

+ water pump

Details of vertical drive for target wheel not yet considered.

M. W

oodward, 24

th Jan 2007Target Module and Plug with Support Services (2)

Estimated Target Changeover Times

Remove

1. Switch off and isolate electric power to magnets (overhead cable system)

8

2. Switch off and isolate power to Target Wheel motor

8

3. Stop Target Wheel coolant pump

4. Blow out Target Wheel

5. Remove/disconnect water supply

6. Close actuated vac valves on beam line each side of target station.

1

7. Close actuated vac valve on AMD side of target station

2

8. Close actuated vac valve on NC Accelerating Cavity side of target station.

9. De-pressurise both pillow seal units 2

10. Attach lifting rods 4

11. Attach lifting beam

12. Lift target station complete with shielding, vac pump running and cryocooler running

2

13. Place into parking enclosure

14. Disconnect from crane 1

~28 Hours Removal

M. W

oodward, 24

th Jan 2007

Estimated Target Changeover Times

~25 Hours Replacement

Replacement

15. Connect lifting rods and beam to new unit with shielding, vac pump and cryocooler running – already under vacuum and cold

2

16. Lower into position – locate 2

17. Pressurise and activate both pillow seal units 4

18. Open actuated vac valve on NC Accelerating cavity side of target station

2

19. Open actuated vac valve on AMD side of target station

20. Test target station vacuum for leaks 1

21. Open actuated vac valves on beam line each side of target station

2

22. Replace/reconnect water supply 1

23. Reconnect power to target wheel motor 1

24. Test wheel motor.Test water flow through target wheel

2

25. Connect electric power supply to magnets 8

TOTAL REMOVAL + REPLACEMENT 53

M. W

oodward, 24

th Jan 2007

DiscussionTopic Action Items:

D. Target Hall Vinod Bharadwaj

More activation/damage calculationsIdentify what numbers are needed from the calculationsFigure how to do the simulation – which program(s) etc.

identify people to do the simulationsinclude detailed layout of hardware:

OMD, SW RF, TW RF, solenoids, shielding

Define target hall dimension requirementstarget hall occupancy needsneeded shieldingwhat is in the hall and what is on the surfacescenarios for all the needed repair/replacement operationsKAS target hall

Does ILC plan to have a central hot cell facility? e+ , dumps etc.will it be useful for the positron stuff

Re-visit two/one target requirement (availability, R&R time,……)

Sufficiently understood?

FLUKA + …?

Regular meetings between DESY, DL, Liverpool, ANL, SLAC

Underway between DL and DESY

Started this process

Any progress?