Mini Workshop on Head-on IR

Wednesday 17 May 2006, 09:30 → 18:00 Europe/Zurich

am session: room 100, bldg 208; pm session : room 101, bldg 200 (LAL-Orsay)

Deepa Angal-Kalinin (AsTec Daresbury), Olivier Napoly (CEA/Saclay)

A working day, following the EUROTeV meeting, to review the status of the optics and simulation work which supports the 0 mrad crossing angle interaction region of the ILC. A telephone conference will be set up with SLAC starting at 3pm CET (6am Pacific). The main topics to be discussed: - final focus optics optimisation - extraction optics design - beam-beam background and beam loss studies - stability of collisions with parasitic crossings

Organisation of the EPAC'06 contribution

We will review the proposed plan of the EPAC'06 paper and we will identify main contributors for each sections.

EPAC Paper Outline EPAC Paper Outline EPAC_plan.pdf

Introduction (X) Motivations to study Alternative IR: machine, detector Final focus optics (Payet) Optimization : CCS, R34 @ PticXing, Doublet strength Dependence on parameter sets and CM Energy Tracking results Beam-Beam (Bambade) Pairs Low energy particle sprectrum : Pairs + Bhabhas + Spent Beam Extraction optics (Appleby) Optics design : space for Fast Feedback kickers (30 cm ??) Parameter of ES separator (20 m vs 25 m) Instrumentation Beam losses Dependence on parameter sets and CM Energy Parasitic crossings (Napoly) Limits on stability Effect of beam tail Conclusion (Y)

Review of the Existing Scientific Material

Preparation of the agenda of the presentations post 3 pm

We will finalize the agenda of the presentations for afternoon teleconference with SLAC at 3 pm CET (6 am Pacific)

12:30 break

Lunch Break

Simulation methods of parasitic crossings and beam stability

We will discuss the methods for modelling the beam-beam collisions at the main and parasitic crossings, and for calculating their impact on the collision stability and on luminosity. The effect of beam tails will be investigated.

Teleconference with SLAC

The actual timing is left to the speakers. The goal is to have thorough discussions.

1 Final Focus Optimisation

Speaker: Dr Jacques Payet (CEA/Saclay)

Slides

• J-Payet.pdf
• J-Payet.pdf
• Slides

2 Tracking Studies of the Final Focus

Speaker: Dr Maria Carmen Alabau Pons (LAL-Orsay)

Slides Slides trackingBDS_17may2006.pdf

3 Progress on head-on extraction optics

Speaker: Dr Julien Brossard (LAL-Orsay)

Slides J-Brossard.pdf Slides

4 Beam-beam background

Speaker: Dr Cécile Rimbault (LAL-Orsay)

Slides Slides

5 Beam losses in the separators

Speaker: Dr Olivier Napoly (CEA/Saclay)

Slides O-Napoly.pdf Slides

6 Evaluation of beam losses up to the 5 mrad dipole

Speaker: Dr Lewis Keller (SLAC)

Slides L-Keller.pdf Slides

7 Effect of a separator breakdown

Speaker: Dr Lewis Keller (SLAC)

8 Discussion on parasitic crossings and collision stability

Speakers: Dr Olivier Napoly (CEA-Saclay), Dr Stefan Tsenov (AsTec Daresbury)

9 Discussion and iteration on the organisation of the EPAC'06 paper

We will present the organisation plan made in the morning to our SLAC colleagues and iterate on the material and contributors

Slides EPAC_plan.pdf Slides