Passive Shim (S-V Magnets Only)

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	-	-	-

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
· LVshim Phantom Assembly	1	-	2125245	-
· Nesting Plate Assembly	1	-	2125247	-

Table 3. Safety

Warning

POISON HAZARD!

THE PHANTOM CONTAINS NICKEL, A SUSPECT CARCINOGEN.

DO NOT INGEST! DISPOSE OF AS A HAZARDOUS WASTE ACCORDING TO STATE AND FEDERAL REGULATIONS.

This procedure applies to S-V magnets only.

Perform a 12-plane, 500 Hz, LVshim scan. For TwinSpeed, use GradMode=WHOLE.

Click here if you need to see the basic LVShim scan protocol . Hint: right click and select “Open in new window” if you would like the scan protocol not to replace the page you are currently viewing.
After the scan is complete, go to the Service Desktop and open the Service Browser if it's not already running.
Start the LVShim tools as shown in .

Figure 1. STARTING THE LVSHIM TOOL FROM THE SERVICE BROWSER
TwinSpeed, highlight WHOLE and click on OK.
Continue as follows:
Install passive shims per the LVshim analysis.
Re-enter S/C shim currents from last iteration.
Perform another LVshim scan, analyze the results, and perform another passive shim iteration if analysis does not meet specifications.

No finalization steps.