Main Page
PREX Wiki
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".
Status and Plans
- Global Run Plan and Daily Run Plan
- COO and safety documents (COO, ESAD, RSAD, OSPs)
- A shutdown work list
- Notes from Run-related meetings
- more details on status
- ADCX Inventory (as of March 11, 2010)
- Compton to do status list DAQ and EDet
- Gem miscellanous informations,to do and status
Documents
- COO and safety documents (COO, ESAD, RSAD, OSPs)
- Helicity Control Board User's Guide
- Target info from Bob and Phil Adderley
- Target info from Meekins
Experiment HowTo and TroubleShooting
Physics Info
- 2005 Latest Proposal Update (PDF), and Same, postscript.
- PREX Web Site on hallaweb has more physics info.
Weekly Analysis Coordinator (WAC)
| 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.
| 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.
| 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.
| 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
- shift signup (password = "leadradius")
- PREX experiment web site
- Parity in Hall A
- Hall A
- Hall A Logbook
- 2008 PREX Workshop
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.
