Attachment '0409_DetChar_MTG.txt'

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   1 * KAGRA Detchar meeting (2013.04.09)
   2 ** 参加者 端山、西澤、新谷、宮川、宗宮、譲原、山本
   3 ** 参考資料
   4 o http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1599
   5 o http://arxiv.org/abs/1303.2613
   6 o http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1604
   7 
   8 ** Agenda
   9 *** 相関磁場雑音 (西澤)
  10 o 地球表面に常に存在する磁場による雑音
  11 	地球一周およびその整数倍の波長の共振周波数
  12 	(7.83, 14.1, 20.3 Hz ...)
  13 o 磁場の大きさ
  14 	Stocastic 0.5-1.0 pT/rHz
  15 	Burst 10pT (頻度は2秒に1回程度)
  16 o 磁場のコヒーレント長 ~1000km
  17         コヒーレント長が長く、相関解析の感度を制限
  18 **** 議事録
  19 o 現状、磁場のモニタがある訳ではないこれから準備。
  20 o KAGRAサイトにどの程度の数のモニタが必要か?
  21 	今後検討。
  22 o 過去の観測データからみれないか?
  23 	地磁気と比べると高周波なので地磁気センサーで見えるかは不明
  24 o 磁気シールドを用いて低減できるか?
  25 	磁気シールドを入れるという話は今のところ無し。
  26 	シールドで何桁か落ちる例もあるので回避可能性がある
  27 o 一度伝達関数を測ってみる必要がある。
  28 	シールドを入れて伝達関数を測定すること自体は難しくない。
  29 	SAS単体で伝達関数は履かれる
  30 o シールドが我々の要求値を満たすのか?
  31 o シールドを入れて磁場が消えるか確認。消えなければ磁気モニタを導入する。
  32 o マグネットアクチュエータでは雑音レベルの要求が厳しくなる(LIGOは静電アクチュエータ)
  33 
  34 
  35 *** 環境モニタ
  36 o サンプルセンサで試験運転(CLIO)
  37 o 必要センサのアンケート(1年前)
  38 o 地物の収録システムは1台分がほぼ完成
  39 **** 議事録
  40 o 時刻同期に関して遅延は?
  41 	時刻はGPSアンテナで決め、伝送遅延はどこかの時刻に換算する。
  42 o 地物のGPSはできれば独立に用意する
  43 o 坑内ケーブルについて
  44 	穴の外にアンテナ、坑内はメタルケーブル
  45 	三代木さんと相談
  46 o 温度などゆっくりなモニタはラック組み込みのADCでとる。
  47 o 地震関係のはやいものはリアルタイムシステムでとる。
  48 o 予算的にどのくらい物が揃うのか?
  49 	購入センサの絞り込み
  50 	センサのプリアンブル・フィルタ・電源の調達
  51 o 磁力計に関して今後情報を集める
  52 	resolutionとresponseの要求レベルがあれば検討可能
  53 o GPSのタイムスタンプずれは検知できるのか?
  54 	何らかの補正は必要
  55 	組み込んでから、時計の擦り合わせをする
  56 	遅延の自動補正がどの程度のものか要確認
  57 
  58 
  59 *** シャドウセンサ
  60 o Q値が高くviolinモードが減衰しない。
  61 	観測期間中、励起されたままになってしまう。
  62 
  63 
  64 *** 防振系detchar
  65 o 防振系の天文台での期間、ゴールが決まっていない。
  66 	関口さん、高橋さんで決定した後、議論してdetcharも参加。
  67 
  68 
  69 *** ノイズバジェット
  70 o LIGOではmatlabベースのソフトウェアを使用

Attached Files

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  • [get | view] (2014-11-11 11:51:10, 342.5 KB) [[attachment:review_Littenberg_arXiv_1410.3852.pdf]]
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