1. ATF2 Status Background for the installation planning of Collimator
N.Terunuma, KEK
i-LINK2013 second collaboration meeting,
LAL, July 1st 2015

2. ATFでの研究開発に参加した共同研究者数(訪問者) Collaborators visiting ATF
ATF2ビームライン建設(Construction)
ナノビーム研究開発(ATF2 beam studies)
海外の大学・研究機関
Oversea Institutes
延べ人数(人日)
man-days
2014
Almost similar to 2013
国内の大学など/ Domestic Institutes
Accelerator Test Facility, KEK

3. 若手研究者の育成/Education of young researchers
博士号総数
53 Ph.D
Accelerator Test Facility, KEK

4. Goals of ATF2 project Produce and Confirm Small Beam Size (Goal-1)
Achievement of 37 nm (s) beam size (ey12 pm, by* 0.1 mm)
Demonstration of a compact final focus system based on local chromaticity correction
Maintaining the small beam size over an extended period of time
Produce and Confirm Stable Beam (Goal 2)
Demonstration of beam trajectory stabilization with nano-meter precision at the IP
Establishment of techniques for controlling beam jitter at the nanometer level with an ILC-like beam

5. History of ATF2 minimum beam size
Major improvements
Beam Monitors
Multi-OTR installed
Shintake Monitor upgrade
May 2010
Multi-pole field error
Skew Sextupoles (installed)
QF1 (exchanged)
Recovery from 3.11 Earthquake
No ATF2 operation
Sextupoles (exchanged)
Feb 2012
Wakefield mitigation,
stabilization of
laser, electron beam,…
Dec 2012
Mar 2013
44 nm
Jun 2014

6. Goal-2 Status Produce and Confirm Stable Beam

7. Installation at the ATF2 IP, 2014.11.8
IPBPM AB
IPBPM C

8. Bunch 1: not corrected, jitter ~ 400nm Bunch 2: corrected,
Best IPFB results
Bunch 1:
not corrected,
jitter ~ 400nm
Bunch 2:
corrected,
jitter ~ 67nm
 limited due to the present BPM resolution 47 nm
2015
Step by step improvement studies on the BPM signal processing
Results from Intra-train Feedback status, P.Burrows,
18th ATF2 project meeting, 25 February 2015

9. List of ATF2 R&Ds Collimator Goal1: toward the 37 nm
Goal2: nanometer beam stabilization
Wakefield-free steering
Grand Motion Studies
 Ground motion based orbit feed-forward
Diamond Sensor
Vertical scanner had been installed in May 2015.
Collimator
 Discussion for installation in this meeting

10. More CLIC related R&D Ultra-low b* OTR/ODR beam monitor
Aiming 20 nm small beam
Two Octupoles will be installed in FY2015 (winter?).
OTR/ODR beam monitor
Equipment will be installed in FY2015 too.

11. The first Diamond Sensor (horizontal) at ATF2:
Installed and tested with beam in 2014
The main purpose is to measure the beam halo distribution with high dynamic range (~106)
made by CIVIDEC Company
Four Sensor Strips

12. 14 Ground Motion sensors have been installed along ATF2
detection of the ground motion effect on the beam
development of a Ground Motion feedforward acting on the beam stability.
evaluation of the vibrational performances for nanometer stabilization.
Guralp 6T GM sensors

13. AWLC14, Americas Workshop on Linear Colliders 2014, May 12, Fermilab
Goal-1
Not sufficient?
Goal-2
Others
AWLC14, Americas Workshop on Linear Colliders 2014, May 12, Fermilab
N.Terunuma, KEK LC review, 7 Feb 2014

14. ATF operation for FY2015
The budget for the ATF operation is almost same as FY2014.
It may spend almost for the maintenance.
Not enough for R&D but some part of support or small improvement can be done
October run is canceled but keep January to March runs.

15. ATF Beam Plan for FY2015, 20 weeks
Canceled