ATF2-straightness monitor meeting

July 3 13:30- , July 4 15:00- , ATF LC meeting room, KEK.

3rd July

Participants : Mike, Urakawa, Terunuma, Araki, Okugi, Kubo and Tauchi

1. Introduction to an Interferometric Straightness Monitor, Michael Hildreth (University of Notre Dame)

file , ppt, pdf ( 14 pages, 2.9MB)

There is some concern for water cooling pipe makes vibrations. We use one inch optics, where a laser beam is transported in fibers. The optics system is mounted on two 25 x 30cm bread board. Present fibers have 20m length. The laser system is 50-60cm long and 5mW, class 2, visible light. The laser light is measured by a CCD camera ( 100um pixel size). Mirror with 200g will be mounted on the BPM.

Q : How much BPM resolution is required for the MFB2 ?
A : It is about 10nm for pulse to pulse feedback system, where the vertical beam size (&sigma_y=400nm).
Q : How many BPMs can be monitored?
A : 2 BPMs at present.
Q : Do you need beam ?
A ; Yes, BPM signals can be compared with the straightness monitor.
Q : What is requirement of beam ?
A : no specific requirement.
Q : Is it parasitic run?
A : Yes, it can be completely parasitically run.
Q : How much is the resolution?
A : It is 0.3nm in principle.
Q : The system must be synchronized. So, how do you do?
A : We will have help from Stewart who is preparing QBPM readout system.
C : Yes, please ask Stewart for synchronization.
Q : How mush is the dynamic range of position adjustment ? , where QBPM is mounted on the FFTB mover.
A : several mm

2. possible location, Toshiaki Tauchi (KEK)

file , pdf ( 4 pages, 1.2MB)

4th July

Participants : Mike, Urakawa, Terunuma, Araki, Kuroda and Tauchi

1. Sketches of potential installation, Michael Hildreth (University of Notre Dame)

file , ppt, pdf ( 9 pages, 2.5MB)