IBIC2012 - List of Authors (Tauchi, T.)

Paper

Title

Page

Measurement of Nanometer Electron Beam Sizes with Laser Interference using IPBSM

1

J.N. Yan, S. Komamiya, M. Oroku, T.S. Suehara, Y. Yamaguchi, T. Yamanaka
University of Tokyo, Tokyo, Japan
S. Araki, T. Okugi, T. Tauchi, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan
Y. Kamiya
ICEPP, Tokyo, Japan

At ATF2, the Local Chromaticity Correction focusing scheme is to be verified through realizing its design vertical e^- beam size (σy ) of 37 nm. The 'IPBSM', installed at ATF2's virtual IP, is the only existing beam size monitor capable of measuring σy < 100 nm, making it indispensable for ATF's goals and R&D at future LCs. This owes to a novel technique of colliding e^- beam against laser interference fringes. σy is derived from the modulation depth of resulting Compton photons, which is large for small σy. The measurable range from O(10) nm ~ a few μm, is controlled by switching between laser crossing angles θ = 174° , 30°, and 2° - 8° . In early 2011, measuring σy < 300 nm was hindered by an immense earthquake and heavy signal jitters. The ensuing recovery and upgrades stabilized the laser system and improved resolution to 5%. In spring 2012, we commissioned advanced crossing angle modes by consistently measuring σy ≥ 150 nm. Our goals for the autumn 2012 run is to stably measure σy < 50 nm. Major hardware upgrades during the summer aim at more reliable alignment and optimization of specialized functions to suppress bias factors.

TUPA14

Development of Cavity-type Beam Position Monitors with High Resolution for ATF2

S.W. Jang, A. Heo, E.-S. Kim
KNU, Deagu, Republic of Korea
Y. Honda, T. Tauchi, N. Terunuma
KEK, Ibaraki, Japan
J.G. Hwang
Kyungpook National University, Daegu, Republic of Korea

We have developed a high resolution beam position monitors for ATF2 at KEK, which is an accelerator test facility for International Linear Collider(ILC). The main goals of ATF2 are achievement of 37nm beam size and 2nm beam position resolution for beam stabilization. For these goals, low-Q IP-BPM(Interaction Point Beam Position Monitor) with latency of 20 ns are being developed. In this paper, we will describe about design of Low-Q IP-BPM, the basics test results as RF test and BPM sensitivity test. An electronics for Low-Q IP-BPM will be also described.

Paper	Title	Page
TUCC04	Measurement of Nanometer Electron Beam Sizes with Laser Interference using IPBSM	1
	J.N. Yan, S. Komamiya, M. Oroku, T.S. Suehara, Y. Yamaguchi, T. Yamanaka University of Tokyo, Tokyo, Japan S. Araki, T. Okugi, T. Tauchi, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan Y. Kamiya ICEPP, Tokyo, Japan
	At ATF2, the Local Chromaticity Correction focusing scheme is to be verified through realizing its design vertical e^- beam size (σy ) of 37 nm. The 'IPBSM', installed at ATF2's virtual IP, is the only existing beam size monitor capable of measuring σy < 100 nm, making it indispensable for ATF's goals and R&D at future LCs. This owes to a novel technique of colliding e^- beam against laser interference fringes. σy is derived from the modulation depth of resulting Compton photons, which is large for small σy. The measurable range from O(10) nm ~ a few μm, is controlled by switching between laser crossing angles θ = 174° , 30°, and 2° - 8° . In early 2011, measuring σy < 300 nm was hindered by an immense earthquake and heavy signal jitters. The ensuing recovery and upgrades stabilized the laser system and improved resolution to 5%. In spring 2012, we commissioned advanced crossing angle modes by consistently measuring σy ≥ 150 nm. Our goals for the autumn 2012 run is to stably measure σy < 50 nm. Major hardware upgrades during the summer aim at more reliable alignment and optimization of specialized functions to suppress bias factors.

TUPA14	Development of Cavity-type Beam Position Monitors with High Resolution for ATF2
	S.W. Jang, A. Heo, E.-S. Kim KNU, Deagu, Republic of Korea Y. Honda, T. Tauchi, N. Terunuma KEK, Ibaraki, Japan J.G. Hwang Kyungpook National University, Daegu, Republic of Korea
	We have developed a high resolution beam position monitors for ATF2 at KEK, which is an accelerator test facility for International Linear Collider(ILC). The main goals of ATF2 are achievement of 37nm beam size and 2nm beam position resolution for beam stabilization. For these goals, low-Q IP-BPM(Interaction Point Beam Position Monitor) with latency of 20 ns are being developed. In this paper, we will describe about design of Low-Q IP-BPM, the basics test results as RF test and BPM sensitivity test. An electronics for Low-Q IP-BPM will be also described.