From: Raymond C. Gernhardt
Sent: Thursday, June 15, 2006 8:50 AM
To: Hans Schneider; Subrahmanya Ramakrishnan; Geoffrey J. Gettelfinger; Wayne T. Reiersen
Subject: C1 temperatures at Hans coil R measurements

Attachments: NCSX C1 Cold Coil R temps.ppt
6/14/06 @ 2:30 C1 temps ranged from 84 to 103 degrees K.
6/15/06 @ 7:30 C1 temps ranged from 112 to 116 degrees K.
 
See attached plot.
 
 
-----Original Message-----
From: Hans Schneider
Sent: Thursday, June 15, 2006 7:30 AM
To: Hans Schneider; Subrahmanya Ramakrishnan; Geoffrey J. Gettelfinger; Raymond C. Gernhardt; Wayne T. Reiersen
Subject: RE: NCSX - C1 Coil Test

This morning at 0730 the coil resistance is about 2.85 - 2.86 milli-ohms.

From: Hans Schneider
Sent: Wed 6/14/2006 4:07 PM
To: Subrahmanya Ramakrishnan; Geoffrey J. Gettelfinger; Raymond C. Gernhardt; Wayne T. Reiersen
Subject: RE: NCSX - C1 Coil Test

Preliminary tests performed about 2:30 today indicate a cold coil resistance of about 1.83 or 1.84 milli-ohms.

-----Original Message-----
From: Subrahmanya Ramakrishnan
Sent: Tuesday, June 13, 2006 12:25 PM
To: Charles L. Neumeyer; Robert J. Marsala; Hans Schneider; Alfred von Halle; Geoffrey J. Gettelfinger; Raymond C. Gernhardt; Gene Baker; Wayne T. Reiersen; Mike Williams; Phil Heitzenroeder
Subject: NCSX - C1 Coil Test

A meeting was held to discuss the grounding scheme. Following was finalized:

1. Disconnect the "Common" wire from the resistance network across the coil to the RACK. GROUND THE RACK TO BUILDING STEEL.

2. Provide resistors (2k or 3k as available) suitable for 1kV from each of the 14 copper clad tubing to ground (Building steel.

3. Solidly ground the Coil Form to Building steel Ground.

4. Provide a Disconnect switch from the common ground lead of the three LEMs (for voltage monitoring of the coil terminals and center point), to Building steel. This switch will be kept open by an insulated stick for meggering or lopotting the coil.

See the revised schematic attached.
Raki