Cc: "Ron Strykowsky" <rstrykowsky@pppl.gov>,
        "Mike Zarnstorff" <mzarnstorff@pppl.gov>,

        "John Schmidt" <jschmidt@pppl.gov>, "Jim Lyon" <lyonjf@ornl.gov>

Subject: Review of GRD and SEMP
Date: Mon, 16 Sep 2002 14:27:42 -0400
X-Priority: 3 (Normal)
Importance: Normal

Folks,

Review comments on the GRD were due on 9/6.  Review comments on the SEMP
were due 9/13.  If you have not already critically reviewed those documents
and provided comments, please do so at your earliest convenience.  This is
especially true for the GRD - we need to make a punch list of issues and get
people mobilized to address them before we come to closure on that document.

Thanks for you attention to this matter,

Wayne

At 1:39 PM -0400 9/9/02, William Blanchard wrote:

X-Sender: wblancha@pobox.pppl.gov
Date: Mon, 09 Sep 2002 13:39:11 -0400
To: wreiersen@pppl.gov
From: William Blanchard <wblanchard@pppl.gov>
Subject: GRD Comments
Cc: hkugel@pppl.gov, mzarnstorff@pppl.gov

Wayne,   A few comments on the GRD.   -Bill

3.2.1.1.2.1 Base Pressure: The initial surface area of the vacuum vessel for first plasma will be approximately 40 M^2 and will be increased significantly in its final configuration. All materials in vacuum should be high vacuum compatible. With a target leak rate in the range of (1-2)x10-5 T-l/sec or less and a pumping speed of 2600 l/sec or better and a well baked and conditioned machine, the device should produce a base pressure in the low 10-8 Torr of impurity gases at 293K. All diagnostics that are not to be left open permanently to the vacuum vessel should have their own pumping system and all appendages, ports and diagnostics should have bakeout capabilities to maintain very high vacuum conditions. All systems and components either in vacuum or with a vacuum interface should be designed to preclude trapped volumes and virtual leaks.

3.2.1.1.2.2 Pumping Speed: delete "which is equal to or greater than that achieved on PBX-M."

3.2.1.2.1.1 Bakeout Background: Suggest that it be pointed out that all systems and materials be compatible for the bakeout temperature they will see for strength, compliance for expansion and vacuum compatibility (developing leaks etc.).

3.2.1.2.1.2 Glow Discharge Cleaning (GDC)   (delete During Bakeout)
a) The facility shall provide a glow discharge cleaning (GDC) capability with DC glow for indefinite periods of time with the vacuum vessel and all components internal to the vacuum vessel at room temperature and at their nominal bakeout temperatures. All windows should have shutters to prevent coating during GDC. All large ceramic breaks should be shielded to prevent coating and high resistance shorts between different grounds.

3.2.1.4.4 PFC Configuration d) delete "sealed"

3.2.1.4.7.2 Gas Injection
The gas injection system shall be capable of injecting any one of three gases (or combination of gases) with a maximum flow rate of at least 50 T-l/sec per injector. The device and facility shall have a programmable gas injection system with feedback on real-time density measurement.

3.3.1.2 Vacuum Compatibility
a) In-vessel metallic components shall be electropolished when feasible
b) All in-vessel components shall be degreased and cleaned as a minimum and baked when practicable prior to installation.
c) All in-vessel materials shall be approved by the Project for vacuum compatibility [3].

3.3.6 Environmental, Safety, and Health (ES&H) Requirements
Somewhere in this section it should state that all vacuum windows of 4" or greater shall have covers over them or otherwise be protected from accidental implosions.


A few questions/comments:
* What are the standoff voltages that systems are to be designed to?
* What is the grounding scheme? What loop resistances can be tolerated? How are they going to be monitored? Some systems should be designed with ease of removing grounds for troubleshooting loop faults (diagnostics, thermocouples etc).

* It might be helpful for new drafts to have the changes that were made in a different color to expedite

Date: Fri, 6 Sep 2002 14:35:45 -0400
To: "Wayne Reiersen" <reiersen@pppl.gov>
From: Tim Stevenson <tstevens@pppl.gov>
Subject: Re: Review of GRD
Cc: hkugel@pppl.gov, hneilson@pppl.gov

Wayne,

In the GRD NBI section quoted below, the pulse length of 1.2 seconds is mentioned as an upgrade. First, the existing NBI system will pulse to 0.5 seconds, with more reliable results at 0.3 seconds. No mention of this pulse length is included, but it is a very fixed limit of this system.

Second, the upgrade to 1.2 seconds is a very big leap in time, technology, and cost that includes upgrades to other auxiliary subsystems also, like the water system. The facility should not be initially designed to accommodate the 1.2 second system as stated because the costs will be prohibitive for the initial beam phase and the upgrade to 4 beam phase. Rather, the existing system should be installed so as not to prevent a future upgrade to 1.2 seconds. This 1.2 second upgrade will require extensive changes.

Henry and I had this conversation earlier today so I write with his concurrence.

Regards,

Tim

3.2.1.4.6.1 Neutral Beam Heating
3.2.1.4.6.1.1 Initial NB Heating Complement
Two of the four beamlines previously used on the PBX-M project will be installed as part of the NCSX Fabrication Project. One will be configured in the co-direction (the nominal direction of the plasma current) and one in the counter-direction. The tangency radius shall be inside the magnetic axis for the nominal 1.7T high beta equilibrium and located such that the beam does not intercept the inboard first wall.
3.2.1.4.6.1.2 Ultimate NB Heating Complement
a) The facility shall be designed to accommodate neutral beam heating using the four (4) beamlines previously used on PBX-M (as a future upgrade) in two possible configurations: [1] 2 co- and 2 counter-directed beamlines and [2] 3 co- and 1 counter-directed beamlines.
b) The facility shall be designed to accommodate an extended heating pulse duration of 1.2s.