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Place: Hongo, Kamioka, eZuce <<BR>>
Time: May 31, 10:00-13:00 <<BR>>		 Place: Hongo (Science Building 1 East (new building), 6th floor, Room 677), Kamioka, eZuce <<BR>>
Time: May 31, 10:00-12:30 <<BR>>
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Expected participants: <<BR>>
 * Masayuki Nakano (from Hongo)
 * Keiko Kokeyama (from Kamioka)
 * Shinji Miyoki
 * Kentaro Somiya
 * Yoichi Aso (cannot attend first half)
 * Osamu Miyakawa
 * Kiwamu Izumi
 * Matteo Leonardi (from Kamioka)
 * Norikatsu Mio (from Hongo)
 * Yuta Michimura (from Hongo)
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 The aim of this meeting is to share and review the design of PSL. The goal is to finalize the PSL layout and share our knowledge on high power handling towards 40 W operation for Phase-2. The main topics are The aim of this meeting is to share and review the design of PSL. The goal is to finalize the PSL layout and share our knowledge on high power handling towards 40 W operation for Phase-2. The main topics are
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 * RF AM generation scheme (KAGRA original)
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 * Participants:
  * Hongo: Norikatsu Mio, Yuta Michimura, Masayuki Nakano, Rei Sakakibara, Kentaro Somiya
  * Kamioka: Keiko Kokeyama, Kohei Yamamoto, Yutaro Enomoto, Osamu Miyakawa, Stefan Ballmer, Matteo Leonardi, Yoichi Aso
  * eZuce: Shinji Miyoki
 * Presentation file: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8331|JGW-G1808331]]
 * Presentation file for MZI: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8335|JGW-G1808335]]

=== High power laser ===
 * Some people say it's not convenient, but LabView interface is good for safety because only few people can access. LIGO also uses LabView for laser control. [Izumi]
 * We have to prepare remote control system, interlock system (and realtime watchdog system), interface to extract important channels
 * Fiber amp has an automatic shutdown system using a connector (turns off if the connector is not grounded). [Nakano]
 * Who will make a laser safety plan?
 * PSL commissioning will be done with the beam attenuated at the output of the laser. And then we move on to 40 W operation. Power to IMC is controlled at the very last stage of PSL. [Nakano]
 * HWP for power controls should be motorized, and should be quiet when not rotating. [Ballmer, Leonardi]
  * We are using the same one as Virgo [Kokeyama]
 * Water cooling of the beam dump "bd5" will create vibration. Move bd5 to the edge of the table (or put it on a different table) [Leonardi]
  * Mio Lab has unused two chiller. He can donate to KAGRA. [Mio]
  * There is a camera to monitor the temperature of the whole PSL [Keiko]
   * It cannot be used for alarms. We need specific temperature sensors [Ballmer]

=== Intensity stabilization system ===
 * ISS AOM should be put before PMC. AOM output is dirty (interference).
 *

=== MZI ===

=== General remarks ===

=== Action items ===

== Related Documents ==
 * Previous summary: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3547|JGW-T1503547]]
 * EOM Layout: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3189|JGW-D1503189]]
 * EOM modulation index: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5611|JGW-T1605611]]
 * Pre-mode cleaner (PMC): [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3515|JGW-G1503515]]
 * Reference cavity (Ref``Cav): [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3493|JGW-T1503493]]
 * Intensity stabilization system (ISS) status: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8291|JGW-G1808291]]
 * Frequency stabilization system (FSS) schematic: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7771|JGW-T1807771]]

PSL Design Meeting (PSL Review)

Information

Place: Hongo (Science Building 1 East (new building), 6th floor, Room 677), Kamioka, eZuce
Time: May 31, 10:00-12:30
Language: English

eZuce

Title: KAGRA PSL Design Meeting
Description:
Community: KEK Community

Agenda

The aim of this meeting is to share and review the design of PSL. The goal is to finalize the PSL layout and share our knowledge on high power handling towards 40 W operation for Phase-2. The main topics are

  • Overall PSL layout
  • Layout of intensity stabilization system (which is different from aLIGO)
  • RF AM generation scheme (KAGRA original)
  • High power compatibility (optics, cleanliness)
  • Safety issues for high power operation

Minutes

  • Participants:
    • Hongo: Norikatsu Mio, Yuta Michimura, Masayuki Nakano, Rei Sakakibara, Kentaro Somiya
    • Kamioka: Keiko Kokeyama, Kohei Yamamoto, Yutaro Enomoto, Osamu Miyakawa, Stefan Ballmer, Matteo Leonardi, Yoichi Aso
    • eZuce: Shinji Miyoki

  • Presentation file: JGW-G1808331

  • Presentation file for MZI: JGW-G1808335

High power laser

  • Some people say it's not convenient, but LabView interface is good for safety because only few people can access. LIGO also uses LabView for laser control. [Izumi]

  • We have to prepare remote control system, interlock system (and realtime watchdog system), interface to extract important channels
  • Fiber amp has an automatic shutdown system using a connector (turns off if the connector is not grounded). [Nakano]
  • Who will make a laser safety plan?
  • PSL commissioning will be done with the beam attenuated at the output of the laser. And then we move on to 40 W operation. Power to IMC is controlled at the very last stage of PSL. [Nakano]
  • HWP for power controls should be motorized, and should be quiet when not rotating. [Ballmer, Leonardi]
    • We are using the same one as Virgo [Kokeyama]
  • Water cooling of the beam dump "bd5" will create vibration. Move bd5 to the edge of the table (or put it on a different table) [Leonardi]
    • Mio Lab has unused two chiller. He can donate to KAGRA. [Mio]
    • There is a camera to monitor the temperature of the whole PSL [Keiko]
      • It cannot be used for alarms. We need specific temperature sensors [Ballmer]

Intensity stabilization system

  • ISS AOM should be put before PMC. AOM output is dirty (interference).

MZI

General remarks

Action items

KAGRA/Subgroups/IOO/Meeting/Meeting20180601 (last edited 2018-06-01 01:27:53 by YutaMichimura)