novel accelerator and detector systems · 9/28/2007  · astromag (al-si) ssc/sdc (al-zn/si)...

Novel AcceleratorNovel Acceleratorandand

Detector SystemsDetector Systems

Roger RuberRoger Ruberruber@tsl.uu.seruber@tsl.uu.se

CAI WorkshopCAI Workshop28 September 200728 September 2007

2Roger Ruber, CAI Workshop, 28 September 2008

Novel Detector Systems

MEG

WASA

ATLAS

3Roger Ruber, CAI Workshop, 28 September 2008

To provide high field while minimizing wall material

• Develop high strength conductorNi-doped Aluminium-stabilizer:

– mechanical reinforcement whilekeeping quench stability

• Integrate solenoid in commoncryostat with LAr calorimeter

• Sophisticated design work:– high strength G10 triangular

support structure (sliding)– 3D current & cryogenics feeding– pure Al-strip quench propagator

ATLAS: How to Meet the Requirements?

0

50

100

150

200

1975 1980 1985 1990 1995 2000 200

Yie

ld S

treng

th [

MP

a]

Year

(Pure-Al)

ASTROMAG(Al-Si)

SSC/SDC(Al-Zn/Si)

LHC/ATLAS(Al-Ni)

BESS-Polar(Al-Ni)

Ordinal Copper

courtesy A. Yamamoto

4Roger Ruber, CAI Workshop, 28 September 2008

Novel Accelerator Systems

• Circular vs. Linear Collider– circular accelerator → synchrotron loss– higher acc. gradient → shorter linac

• Power Production– klystron → maintenance cost– two-beam acceleration

• Accelerating Gradient– superconducting → limit ~50 MV/m (Bc)– normal conducting → RF break down

• CTF3 international test facility– power production & high gradient

cost

energy

CircularCollider

LinearCollider

drive beam

main beam

RF power

pulsed RFpowersource

d

RF load

Electric fieldRF wall currents

courtesy H. Braun

5Roger Ruber, CAI Workshop, 28 September 2008

• reliability issue– operation stability– beam stability (kick)

• structure damage– conditioning to reach nominal– damage in high field areas

• physics phenomena to be investigated– electron & ion currents, radiation (visible, UV, X-ray)– microscopy & DC break down

RF Break Down

©© CERNCERN30 GHz30 GHz

©© CERNCERN

6Roger Ruber, CAI Workshop, 28 September 2008

Summary

• Broad physics & engineering experience

• Project management & collaborationwith CERN, KEK & industry

• Looking for collaborators in– particle & accelerator physics– material science &

surface physics– electromagnetism– electronics– software & control– design, construction & engineering– …

contactruber@tsl.uu.se