C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

Positron generation

L. Rinolfi (CERN)

Contribution exceptionnelle de la France

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

Thermoinic gunUnpolarized e-

LaserDC gunPolarized e-

Pre-injector Linac for e-

200 MeV

Pre-injector Linac for e+

200 MeV

Primary beam Linac for e-

5 GeV

Inje

ctor

Lin

ac

2.2

GeV

e+ DR

e+ PDR

2.424 GeV365 m

Boo

ster

Lin

ac

6.6

GeV 4 GHz

e+ BC1 e- BC1

e+ BC2 e- BC2e+ Main Linac e- Main Linac

12 GHz, 100 MV/m, 21 km 12 GHz, 100 MV/m, 21 km

2 GHz

e- DR

e- PDR

2 GHz 2 GHz 2 GHz

4 GHz 4 GHz

12 GHz 12 GHz

9 GeV48 km

561 m

234 m

2.424 GeV365 m

RTMLRTML

110 m 110 m

50 m 50 m

e-/Target

e

Target

AMD

2.424 GeV365 m

2.424 GeV365 m

The CLIC Injector complex in 2008

3 TeV

Base line configuration

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

Conventional e+ source based on channelling

A e- beam impinges on the crystal: - energy of 5 GeV - beam size of 2.5 mm

crystalamorphous

e-e-

e+

Yield: 0.9 e+ / e-

@ 200 MeV

•A crystal e+ source :• - a 1.4 mm thick W crystal oriented along <111> axis• - a 10 mm thick W amorphous disk

•Charged particles are swept off after the crystal:only (> 2MeV) impinge on the amorphous target.

e-

e+

R. Chehab, A. Variola, A. Vivoli / LAL, V.M.Strakhovenko / BINP - Novosibirsk

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

The CLIC Injector complex (Compton)

3 TeV

Laser Compton ring configuration

Laser

Laser

DC gunPolarized e-

Pre-injector Linac for e-

200 MeVe+ Target

Pre-injector Linac for e+

200 MeV

Inje

ctor

Lin

ac

2.2

GeV

e+ DR2.424 GeV

Boo

ster

Lin

ac

6.6

GeV 4 GHz

e+ BC1 e- BC1

e+ BC2 e- BC2e+ Main Linac e- Main Linac

2 GHz

e- DR

e- PDR

2 GHz 2 GHz

4 GHz 4 GHz

12 GHz 12 GHz

9 GeV48 km

e- Drive Linac 1.3 GeV

Compton ring

e+ PDR and Accumulator

ring

2 GHz

RF

gun

Stacking cavity

2.424 GeV2.424 GeV

2.424 GeV

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

Fabry-Perot cavity developed at LAL

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

Collaboration for laser developments

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

Tests at ATF / KEK

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

CERN/LAL collaboration studies on CLIC e+ sources

L. Rinolfi (CERN), A. Variola (LAL)

Document written in August, dated 2 September 2008

Sent to the CERN DG on 3 September 2008

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

Proposal for e+ source studies for the CLIC Base Line (unpolarized e+)

Proposal for e+ source studies for the CLIC Compton ring (polarized e+)

Two proposals with corresponding deliverables

Deliverables by LAL for the CLIC Base Line studies: 1) Detailed characteristics of the targets and the corresponding geometry. 2) Provides the Peak Energy Deposition Density (PEDD) for each target and the heating consequences and verifies the possible mechanical stresses. 3) Detailed beam characteristics at the end of the e+ Pre-Injector Linac (bunch charge, transverses and longitudinal emittances, energy, energy spread, bunch length, ....)

Deliverables by LAL for the CLIC Compton ring studies: 1) Study if the existing design of the optical/stacking cavity could be rescaled for CLIC requirements after ATF results. 2) Detailed laser characteristics corresponding to the proposed stacking cavity. 3) Characteristics of the photons flux with the corresponding geometry (distance, collimation,....). 4) Assuming that a single target will be used, detailed characteristics of the target. 5) Provides the PEDD and parameters related to thermal and mechanical effects. 6) Results of simulations optimized at 200 MeV showing detailed beam characteristics at the end of the e+ Pre-Injector Linac (bunch charge, transverses and longitudinal emittances, energy, energy spread, bunch length, …..). 7) Results of experimental tests at ATF for the optical cavity and the laser system.

C L I CC L I C

1st October 2008Réunion sur la contribution exceptionnelle de la France

Positron generation

Man power and Schedule

October 2008 to October 2010

Schedule: (assuming green light from CERN DG this month)