Cryopayload's Action Item List

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General Descriptions

This is a list of action items identified in the cryopayload meeting after its kick-off (2013 Nov 15). If you want to know the previous information or historical path to the cryopayload meetings, please refer to CRY-AOS meeting.

Action Items

A/I#

Identified on

Assigned to

Status/Output

Related to

Description

Due date

001

2013 Nov. 19

Sekiguchi, Hirose

Closed. Takanori and Osamu Miyakawa found the document about OSEM (it includes the schematic design of circuit) by themselves.

Control

Ask somebody in LIGO details of the circuit for OSEM.

2013 Nov. 26

002

2013 Nov. 19

R. Takahashi

Urgent! He has already asked, but no reply so far. If he will not receive anything by the next meeting, we must make drawings by ourselves (we copy Type B design and rewrite and so on).

Overall design

3-D design drawing of Type-A is necessary (ASAP!). Ask to Gianni.

2013 Nov. 26

003

2013 Nov. 19

R. Takahashi

Closed. Ryutaro explained. However, further discussion is necessary.->(#011)

Vertical spring

About blade metal spring (vertical spring), the schedule and strategy and so on will be summarized by R. Takahashi, Ishizaki, Sekiguchi, and K. Yamamoto, and reported in the next meeting.

2013 Nov. 26

004

2013 Nov. 19

K. Yamamoto

Urgent! (1)Eric is busy. Kazuhiro will ask again to send Eric’s file to Kazuhiro. Eric stays in Japan on the next week. Kazuhiro also will ask Yoichi Aso whether he can with COMSOL. (2)No files remain in Ando lab.

Material

About the masses, including a recoil mass, intermediate mass, intermediate recoil mass, and platform, the evaluation of the eddy current damping is necessary. K. Yamamoto will ask (1) to Eric Hennes how much he can make his effort for this problem and whether he can provide files for Finite Element Analysis. (2) to Ando or Aso whether Nishi's file for eddy current damping still remains.

2013 Nov. 26

005

2013 Nov. 19

D. Chen

Closed. The Picomotor didn’t work at 77K. But that might be because of the cooling shock. So we will have quick cooling test.

Control

D. Chen will ask Uchiyama whether a picomotor can survive at cryogenic temperature.

2013 Nov. 26

006

2013 Nov. 19

D. Chen

Closed. He received the design drawing from Takanori.

Control

D. Chen looks for design drawing of a stage for Type-B, and some commercial stages.

2013 Nov. 26

007

2013 Nov. 19

K. Yamamoto

Closed. Kazuhiro rewrote it.

Control

The schedule for the control system should be considered again.

2013 Nov. 26

008

2013 Nov. 19

K. Yamamoto

Urgent! By the beginning of the next week, Kazuhiro must tell Ryutaro how many he orders (Kazuhiro must take extra pieces into account).

Control

About the procurement of the OSEMs, K. Yamamoto will consult R. Takahashi.

2013 Nov. 26

009

2013 Nov. 19

T. Suzuki

Urgent! He asked Kimura-san, but no reply so far. The cryogenic test is necessary. (Thrust bearing is about 50mm in diameter and 300kg load).

Control

Check whether the thrust bearing can work at the cryogenic temperature.

2013 Nov. 26

010

2013 Nov. 19

D. Chen (?)

Urgent!(i)In order to fix LED and PD, PCB is used. We must check PCB is OK at low temperature. (ii)Dan shows 7m cable increases the noise. Long cable can generates oscillation at high frequency region. The length of cables for cryo payload is 20m in length. We must check how much the long (flat) cable generates noise. If it is a problem, satellite boxes in vacuum are necessary. (iii)Window of photo detector will be removed because nitrogen gas is in Photo Diode.

Control

About OSEM, (i)check about out gas; (ii)check noises by 10-m long line; (iii)check whether the window of photodiode be removed.

2013 Nov. 26

011

2013 Nov. 26

T. Sekiguchi

Urgent!

Vertical spring

For the basis of discussion, Takanori will summarize the vibration via heat link until this weekend. After that, he and Ryutaro circulate their ideas about vertical spring and we discuss.

2013 Dec. 1

012

2013 Nov. 26

K. Yamamoto

Urgent!

Vertical spring

Kazuhiro rewrites schedule.

2013 Dec. 3

013

2013 Nov. 26

K. Yamamoto

Urgent!

Sapphire monolithic suspension

Kazuhiro will summarize the details of schedule for monolithic sapphire suspension based on above discussion by the next meeting.

2013 Dec. 3

014

2013 Nov. 26

T. Suzuki and K. Yamamoto

Urgent!

Sapphire monolithic suspension

Suzuki-san and Kazuhiro will report the serious lack of human resources on the next year to SEO and EO.

2013 Dec. 3

015

2013 Nov. 26

R. Kumar

Urgent!

Sapphire monolithic suspension

Rahul investigates how much the lowest frequency of sapphire spring is. After that, we ask it is a problem for observation to Data Analysis group.

2013 Dec. 10