1

ATF2 Tuning and its application to ILC and CLIC FFS/IR region

• ASTeC and MAN : working together on tuning methods for the ATF2 and ILC IR/extraction design

• The aim is to test the developed tuning procedures experimentally at ATF2

• Based on the knowledge gained at ATF2, provide an important feedback to the ILC and CLIC final focus/IR tuning methods.

• Use presently developed simulation tools to provide optics and beam halo tracking input for the background studies.

2

Emittance Tuning Simulations• Developed a robust integrated simulation environment for analysis of various

methods of beam tuning simulations.

• Simulation structure works for both ILC and ATF2 with minimal changes.

• Investigated traditional and more novel methods of beam tuning on ILC and ATF2.

• Analysis shows viable methods can be created to remove the emittance dilution effects as seen at the IP, using only the final 5 sextupole magnets.

• Performed further investigations into the linearity of such tuning knobs, and the limits with position and field errors on the tuning magnets.

• Performed tolerance studies on both the ILC and ATF2 including the effects of trajectory correction.

J. Jones, A. Scarfe

3

BDS Collimation Optics Design

• Lattice optimisation demonstrates significant improvement in collimation efficiency

• Collimation depths for different detector concepts, different L* covering all the parameter ranges of the ILC

Collimated halo before optimisation

Collimated halo after optimisation

F. Jackson

4

The number of particles inside the laser spot ±100 µm is 44% of its number at IP

y offset (600 µm) y’ offset (12 µrad).The number of particles inside the laser spot ±100 µm is 0.1% of its number at IP.

Without detector field

With detector field

14 mrad baseline extraction optics

• To compensate the detector effect and to increase the number of particles inside the laser spot size.

• Include anti-solenoid, anti-DID (for different detector concepts)

• Include magnetic and beam errors to study the diagnostics performance and effect on beam losses at collimators

D.Toprek, R. Appleby

Beam at second focus

5

Deliverables

• Participation in commissioning of ATF2 final focus system to test final focus optics design

• Application of various tuning procedures and tuning knobs

• Based on the feedback at ATF2, make necessary changes in the ILC/CLIC BDS final focus and interaction region design. These studies will include the detector solenoid field, anti-solenoid and anti-DID for realistic machine and beam errors.

• Studies of machine induced backgrounds arising from beam transport in the extraction line utilizing simulation tools developed for the ILC.

6

FP7 Contribution + Request

MAN contribution is:

12 PM R. Appleby - Faculty member – guaranteed

36 PM RA post – requires approval by lab. Negotiations in progress

 12 PM – FP7 request

ASTEC contribution is: requires approval by lab

12 PM J. Jones – STFC permanent staff

3 PM F. Jackson – STFC permanent staff

3 PM D. Angal-Kalinin- STFC permanent staff

 12 PM – FP7 request

7

Resources (MAN)

Material [€] Integrated human resources

direct [€] Indirect [€] [FTE·months] direct [€] indirect [€]

Lab contribution (a) 0 0 48 268608 163648

Requested (b) 0 0 12 67152 40912

Total (a+b) 0 60 335760 204560

Resources (ASTEC)

Material [€] Integrated human resources

direct [€] Indirect [€] [FTE·months] direct [€] indirect [€]

Lab contribution (a) 0 0 18 105000 110250

Requested (b) 0 0 12 70000 73500

Total (a+b) 0 0 30 175000 183750

Travel request: 5k€ per year