104th ATF2 weekly meeting
June 24 14:30- 18:00, ATF LC meeting room, KEK.
International phone/webex meeting
Monalisa vacuum test results in Oxford university, David Urner, Paul Coe (University of Oxford)
file : ppt, pdf (pdf, 14pages, 608KB) and report (PDF)
David reported recent results of vacuum test as promised at previous meeting. Measurements consist of lateral spring constant, longitudinal forces in free and attached to frame. Wooden frame has been made to mimic a system of Shintake monitor and QD0. All the results are satisfactory. Therefore, the schedule of shipment will not be changed.
- C : We are pleased to see the results, and appreciate efforts at Oxford university.
- Q : Are the results same without support rods in the double bellow system ?
- A : The rods do not effect them .
- Q : How much can QD0 move ?
- A : The double bellow system allows the movement within ±5mm .
- Q : When will QD0 be aligned ?
- A : It will be done at the same time of Monalisa's test.
- Q : How much is the weight on QD0 ?
- A : It is 40 to 50Kg on QD0.
- Q : How to install the Monalisa system ?
- A : Concrete ceilling will be removed to use the crane for lifting .
- Q : The wooden frame will not be sent back.
- A : It is OK. We will make it if necessary at Oxford .
- Q : Also, we would like to ask you for complete list (invoice) as soon as possible.
- A : Yes, we will.
- Q : Is any compressed air available near the IP?
- A : There is a valve near the area. The pressure is 0.5MPa, i.e. 5atm.
There was a short discussion on the price for tax at custom, where 5% of the price is paid.
KEK site meeting
file :Yamanaka's ppt, Yamanaka's pdf (16pages, 3.9MB) , Oroku's ppt, Oroku's pdf (4pages, 124KB)
Schedule during summer shutdown is made.
- Screen monitors and knife edge
- Two design of linear motion stage were presented. Seiwa one is selected.
- How to adjust the screens and knife edges at the IP?
-- movable mechanics is needed but should be rigid
- Additional collimator after the bending magent flange
- it should be after the detector for wire scanner.
- need to negotiate Aryshev with the position of the detector and additional collimator.
- Laser injection path to the IP-BSM vertical table
- to use the present laser path, EXT LW laser should inject at the upstream in the table.
- to do so, pass the EXT LW laser in beam height from the north wall to the table,
drop just beside the table and inject from the lower height
- Detector upgrade
- Gain monitoring system is planned with existing fiber bundles at Tokyo university.
There was a suggest to study the background which has been observed during the beam studies such as dependence of QD0 current, horizontal beam size, offset of beam orbit near the last bending magnet etc. .