Main Page 2010

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PREX Wiki circa 2010.

This was the state of the wiki in the 2010 PREX-I run. I'll leave the rest verbatim. Welcome to the Wiki for the Lead Radius Experiment ("PREX").   The purpose of this Wiki is to organize information relevant to the running experiment, and to foster communication and collaboration.

Shift Signup   Pw for signup = "leadradius".


Meetings

test

Status and Plans

Experiment   HowTo   and   TroubleShooting

Physics Info

Weekly Analysis Coordinator (WAC)

WAC instructions

WAC schedule
Dates (2010) WAC name
03/11 - 03/17 Mark Dalton
03/18 - 03/24 ZAFAR AHMED
03/25 - 04/03 Rupesh Silwal
04/04 - 04/10 Jon Wexler
04/11 - 04/17 Chun-Min(Mindy) Jen
04/18 - 04/24 Diancheng Wang
04/25 - 05/02 Abdurahim Rakhman
05/03 - 05/09 Xiaoyan Deng
05/10 - 05/17 Chun-Min (Mindy) Jen
05/18 - 05/24 Luis Mercado
05/25 - 05/30 ZAFAR AHMED
05/31 - 06/06 Jon Wexler
06/07 - 06/14 Chun-Min (Mindy) Jen
06/15 - 06/22 ZAFAR AHMED

Spectrometer Tunes

Tune A

The dipoles should be regulated at P0=1.063 GeV/c, don't regulate the quads. Input their currents as follows.

Tune A
Left Arm Right Arm
Magnet Current per momentum Actual current Current per momentum Actual current
Q1 " Same as Right 499.872 Amps/GeV 531.364 Amps
Q2 " Same as Right 408.565 Amps/GeV 434.305 Amps
Q3 " Same as Right 581.566 Amps/GeV 618.205 Amps

Tune B

Regulate all magnets. Choose prex_B from the menu and type 1.063 into the prex brown box.

Tune X

The dipoles should be regulated at P0=1.063 GeV/c, don't regulate the quads. Input their currents as follows.

Tune X
Left Arm Right Arm
Magnet Current per momentum Actual current Current per momentum Actual current
Q1 " Same as Right 547.583 Amps/GeV 582.081 Amps
Q2 " Same as Right 446.039 Amps/GeV 474.139 Amps
Q3 " Same as Right 500.956 Amps/GeV 532.516 Amps

Tune Y

The dipoles should be regulated at P0=1.063 GeV/c, don't regulate the quads. Input their currents as follows.

Tune Y
Left Arm Right Arm
Magnet Current per momentum Actual current Current per momentum Actual current
Q1 " Same as Right 588.4669 Amps/GeV 625.540 Amps
Q2 " Same as Right 414.8950 Amps/GeV 441.033 Amps
Q3 " Same as Right 523.7803 Amps/GeV 556.778 Amps

Useful Contact Numbers

How to Page People

For regular (non-alphanumeric) pagers, I think the "old" method still works. It's like 9-584-XXXX. On a JLab computer, type "staff fred" to look up the pager number for "fred".

  •   The Run Coordinator pager works with this method.

For alphanumeric or cell-based pagers, I think the only reliable way is to use the web interface, as follows:.

  •   To page anyone.   enter name, or username, and a dialog pops up. Click "Click to Page" and do the obvious.
  •   To page Bob

Pitfalls of the pager system (AFAIK):

  • If you use the web-based pager to page someone with a non-alphanumeric pager, it won't work. They get a beep but no information about who paged them nor the message.
  • If you page someone (like the hall A techs) with a cell-phone-based pager, using the old method (584-XXXX) it won't work: fails silently. The only way to page such people is via the web-based paging system.
  • The Telecommunications info is difficult to find on the web and not clear. If someone knows better, edit this line.

Related Links

How to Contribute to this PREX Wiki

  • To get a new account: click login (top right corner)
  • Where the page invites you to obtain an account click "request one" and follow the instructions.
  • I'll get an e-mail, will approve you and you'll get a password by e-mail.

Consult the User's Guide for information on using the wiki software.

General Info about Wiki

Fall 2016 HOWTO

Info about how to run the DAQ, analyze data, etc, in 2016 : Fall2016 HOWTO