g g option

　 T.Takahashi Hiroshima

option

T.Takahashi Hiroshima Univ.

June 28 2006

Principle of , e Collider

e beam e beam

laser

laser

cp ip

Spectrum, polarization, depends on electron/laser polarization

h

electron polarization is essential,,,, both beam should be electron

T.Takahashi Hiroshima

Physics

• (h->)Br(h->bb) ~ 2%

– sensitive to heavy partilces

• Heavy Higgs– reach up to 0.8Sqrt(ee)– H coupling sensitive to SUSY parameters– sesitive to CP properties

• Linear pol, HA mixing– But need experimental studies

• SUSY– large cross section but large BG

• WW, tt coupling

h/H/A


Lasers for Photon Colliders

• have to meet– 5J/pulse– 337ns separaton 3000bunches/train – 5Hz

• simple estimate of cost for the laser– to pump 5J ×3000 pulses in 1ms

5 300050 $250

1 (0.3)

Jpumping power MW M

ms eff

$5/w


Technical Issues

• Lasers and optics– high power, high repetition– pulse stacking cavity

• larger beam crossing angle– 25mr?

• beam dump – collimated gamma beam– spent e- beam w/ large angular spread

• Optics at IP region – < 5-7degree dead


current idea

Gronberg

Nanobeams 2005 – Kyoto – October 17-21, 2005J. Gronberg - LLNL

The MERCURY laser already has more average power than we need

Goal:• 100 J• 10 Hz • 10% Efficiency• 2-10 ns • < 5X Diffraction limit • > 108 shots

Output

Diode arrays• 8 diode arrays• 6624 diodes total• 730 kW peak power

Front-end• 300 mJ

Gas-cooledamplifier heads• Helium gas flow at 0.1 Mach

Cavity Laser:• 764 W average power• 119 kW peak power

Gronberg

requirement for Cavity

~$10M for each ( need 2+


a detector w/ cavity


beam crossing angle

• Bottom line

10d mr QD0

d

Qx

*L

QR

x d Q

e-

Laser

beam simulation

Q depend on QD and FF optics

20x mr strawman design by MDI group


20-25

new bend for additional

2.5mr

move detector 1.8m

new tunnel for beam dump


work for 25mr


Beam extraction

e-

Laser

e-

beamstrahluong

Compton

out going electron 10mr-12mr

beamstrahlung 3-4mr 1m at 250m from IP

Compton g ~40rx15r 1cmx0.35cm at 250m


beam dump


Detector modification


Klaus


switching e+e- ＜－＞

• move beam line and detector to 25mr• replace forward/backward region of detector• Install laser system• replace beam dump • position to electron

a lot of job,,,, takes years?

When should we go to ?


When go to

• Indication of Heavy Higgs• some hints of CP violation in higgs sector?• something unexpected

after 500 GeV e+e- then back to e+e- at 1TeV?

go to 1TeV e+e- anyway then switch to

or

or

,,,,,,,,,,,,,,


Summary• Options have to be read when needed but switching

takes some,,,• technical issues to be developed

– pulse stacking cavity – beam dump

• issues to be decided – linac configurations for large crossing angle– compatibility of detector

• low angle region can be removable?• never mind?

– entire end-cap or detector will be replaced

depends on physics (time scale for the switching)

g g option

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