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ANAC - Assessment of Novel

Accelerator Concepts

(Work package 11)

Objectives:

This WP merges three important topics regarding novel accelerator concepts in three different fields: high luminosity colliders (Task 2), technologies required by neutrino facilities (Task 3) and plasma wave accelerator techniques (Task 4). Existing infrastructures used in the three Tasks:

DAΦNE e+e- storage ring, INFN Frascati National Laboratories
LHC collider, CERN
EMMA FFAG Ring, Daresbury Laboratories
SPARC LAB, INFN-Frascati National Laboratories
LOA, CNRS

Task 1. ANAC Coordination and Communication.

Coordination and scheduling of the WP tasks
Monitoring the work, informing the project management and participants within the JRA
WP budget follow-up

Task 2. Design of Interaction Regions for high luminosity colliders.

Feasibility study of a new IR based on the Crab Waist concept for the upgraded KLOE experiment at DAΦNE.
Study the possible integration of the Crab-Waist collision scheme into the LHC collider upgrade

Task 3. Upgrade of the EMMA FFAG Ring.

Design, build and test the external diagnostics systems for EMMA.
Commission EMMA using the diagnostics and perform the necessary experiments to evaluate non-scaling optics for a variety of applications.

Task 4. Instrumentations for novel accelerators.

Design, build and test of detectors for emittance measurements of electron beams delivered by laser plasmas accelerators.

Description of work:

Task 1. ANAC Coordination and Communication.

The activities of this task are to oversee and co-ordinate the work of all the other tasks of the work package concerned, to ensure the consistency of the WP work according to the project plan and to coordinate the WP technical and scientific tasks with the tasks carried out by the other work packages when it is relevant. The coordination duties also include the organization of WP internal steering meetings, the setting up of proper reviewing, the reporting to the project management and the distribution of the information within the WP as well as to the other work packages running in parallel.

The task also covers the organization of and support to the annual meetings dedicated to the WP activity review and possible activity workshops or specialized working sessions, implying the attendance of invited participants from inside and outside the consortium.

Task 2. Design of Interaction Regions for high luminosity colliders.

The main purpose is to prove the compatibility of large detectors with a novel Interaction Region (IR) design relaying on large Piwinski angle, low–β and crab waist, a configuration capable to provide for the DAΦNE electron/positron collider a significantly larger luminosity than in the original configuration and a collision scheme which can be applied to other existing and future lepton colliders in order to reach unprecedented luminosities. Compatibility between the conflicting requirements of high luminosity IRs and experimental detectors is also an issue in terms of IR mechanical structure design, collider optics, beam dynamics and background rejection. The KLOE detector at DAΦNE will be upgraded in order to cope with the higher luminosity rates expected from the improved collision scheme. The study proposed is aimed at designing a new IR fitting inside the KLOE detector and implementing the new collision configuration, which will be tested at DAΦNE in 2008 with the SIDDHARTA detector. The experience gathered on the DAΦNE collider will be crucial to address possible issues in view of successful runs with more demanding detectors as KLOE, FINUDA or other possible future experiments. This activity will be of interest also the most advanced non-EU Laboratories, such as the Japanese KEK and the Chinese IHEP, as well as for the hadron collider LHC coming into operation at CERN, for which several approaches are under study in order to increase the collider luminosity beyond Phase-I.

Sub-task 1: DAΦNE IR design for the upgraded KLOE detector. INFN will provide the infrastructure and perform beam parameter optimization, beam-beam simulations, Touschek lifetime calculations, background remediation studies. BINP will contribute with dynamic aperture optimization, beam-beam simulations, intra-beam scattering (IBS) and Touschek computation. CNRS will take part to the design of the luminosity monitor and to the beam measurements.
Sub-task 2: Study of an IR design with large Piwinski angle and crab waist collision scheme for the LHC upgrade. CERN will take care of beam parameter optimization, IR design and bb simulations

Task 3. Upgrade of the EMMA FFAG Ring.

The Electron Model of Many Applications (EMMA) ring will be the world’s first so-called non-scaling FFAG. It is being constructed at the STFC Daresbury Laboratory to prove the principle of this type of accelerator and its successful operation could have far reaching consequences. Construction of the EMMA ring is due for completion in early to mid-2009. As EMMA is a proof-of-principle accelerator, diagnostic devices to measure all aspects of the machine operation are very important. The EMMA ring will be instrumented with devices to measure the beam position, transverse profile, time of flight and beam intensity. However, certain measurements can only be made in an external beamline, for example emittance, longitudinal profile and momentum. In this project, we plan to design, prototype, test, construct, install and commission the diagnostics devices for these measurements. In addition, an emittance measurement system will be constructed for the injection line to allow a study of emittance growth in the ring.

Sub-task 1: External diagnostics design, construction and testing. The requirements for the diagnostics will come from tracking studies performed by CNRS-Grenoble and STFC at the Daresbury Laboratory. The design, construction and testing of the devices will be undertaken by staff in STFC. The installation in the beam-lines will also be done by STFC staff.
Sub-task 2: Commissioning and experimental running. Commissioning of EMMA using diagnostics will be undertaken by staff from STFC and CNRS. The experimental measurements with these devices required to determine the applicability of non-scaling optics for the applications being studied will also be made by staff at STFC and CNRS.

Task 4. Instrumentations for novel accelerators.

The need of new instrumentation to diagnose parameters of electron beam produced by laser plasma accelerator is extremely important. An experimental methodology in needed to investigate their parameters, such as emittance or relative energy spread, since they are not today produced with a very high shot to shot reproducibility than the one currently produced using RF cavities based accelerators. We propose to study the different approaches for measuring emittance of these electron beam delivered by laser plasmas accelerators. The emittances are expected to be in the mm.mrad range. The diagnostic which satisfies the best criteria will be then developed and tested using ultra short electron beams produced in European accelerator facilities or laser based accelerators.

Different approaches for measuring the beam emittance have also been suggested or tested in the past. To avoid errors induced shot to shot fluctuation in the emittance measurement INFN will develop a single shot emittance measurement or a specific technique to reduce those errors. This diagnostics will be tested at the SPARC Lab in Frascati, where a low emittance RF gun is available. The selected technique will be then tested and used at LOA where a laser plasma accelerator will be developed for this purpose.

QUICK LINKS
ANAC Website | ANAC Publications | ANAC Intranet

New Interaction Regions for KLOE2 at DAΦNE (WP11.2). Image courtesy of INFN Frascati.