7T general info & troubleshooting: Difference between revisions
From SpinozaWiki
No edit summary |
No edit summary |
||
| Line 20: | Line 20: | ||
=== Power off and power on sequence(s) === | === Power off and power on sequence(s) === | ||
==== CDAS ==== | |||
* Reset CDAS: turn off green switch. Wait 5 seconds. Turn red switch. Wait 5 seconds. Turn on in reverse order. | * Reset CDAS: turn off green switch. Wait 5 seconds. Turn red switch. Wait 5 seconds. Turn on in reverse order. | ||
==== Main System ==== | |||
* Power off sequence: 1. scan computer. 2. CDAS. 3 Power gradient (right) and System (left), see [https://www.spinozacentre.nl/wiki2/images/2/25/7T_powersequence_Leiden.pdf Leiden document (original in scstaff)] | * Power off sequence: 1. scan computer. 2. CDAS. 3 Power gradient (right) and System (left), see [https://www.spinozacentre.nl/wiki2/images/2/25/7T_powersequence_Leiden.pdf Leiden document (original in scstaff)] | ||
* Power on sequence: in reverse order | * Power on sequence: in reverse order | ||
==== Compressors ==== | |||
Procedure testing/resetting compressors Helium pump: 2 small cubic devices in the far right corner. The green light on the left device should be flashing. | |||
Check messages on small LED-displays: scroll with arrow up/down buttons. Should all be OK, not ERR. | |||
Temperature of tubes should be below room temperature (i.e. cold). | |||
To reset: press OFF. You should hear it switching off. Wait, and press ON, again hearing it switching on. | |||
To hard reset: Press OFF. Wait. Turn small black switch from I to O. Wait. Turn back to I. Wait. Important: press ON to turn the compressor back on. | |||
=== Common malfunctions === | === Common malfunctions === | ||
Revision as of 16:05, 21 May 2015
General safety aspects
- differences with 3T
Table operation
Useful commands at console
(might move to separate page accessible to all users)
- permproc stop|start all stop|start all processes (NB including data transfer!).
- start_stop_procs.pl stop also stops background processes. Needed in case of hardware reset in service room.
- Communication with PRIDE (e.g. for image-based shimming): PrideXS_XML. In case of error Access denied, no SW key pressed, kill process pridexsproc_win_cs.exe in Task Manager.
- Export raw data: use gt pack 'n go utility
- Location shim parameters: E:\Export\PRIDE\shimtool\linear_shim.txt
Changed default settings
- Control parameter Reconstruction: Noise clip factor 1,2,3: 0.001. Avoids noise clipping of phase to -pi in case the SNR is too low.
- Increased maximum average power to 20: max_avg_pow: 20 in mpgcoil_mtx_tr.i, add file to patch folder to apply.
Power off and power on sequence(s)
CDAS
- Reset CDAS: turn off green switch. Wait 5 seconds. Turn red switch. Wait 5 seconds. Turn on in reverse order.
Main System
- Power off sequence: 1. scan computer. 2. CDAS. 3 Power gradient (right) and System (left), see Leiden document (original in scstaff)
- Power on sequence: in reverse order
Compressors
Procedure testing/resetting compressors Helium pump: 2 small cubic devices in the far right corner. The green light on the left device should be flashing. Check messages on small LED-displays: scroll with arrow up/down buttons. Should all be OK, not ERR. Temperature of tubes should be below room temperature (i.e. cold). To reset: press OFF. You should hear it switching off. Wait, and press ON, again hearing it switching on. To hard reset: Press OFF. Wait. Turn small black switch from I to O. Wait. Turn back to I. Wait. Important: press ON to turn the compressor back on.
Common malfunctions
- table
- coldhead compressors
- gradient amplifiers
Philips contacts (?)
Cor Romijn Anton ? Merel ?