Plasma Subgroup Question #3 Comments

Ron Petzoldt Tue 23 June 1999 15:48 Subject: Re: FESAC (2pp) on IFE Target Injection & Tracking Gentlemen,   Since the FESAC 2 pagers were written, we've come to understand that greater accuracy ~±20 microns will be required for hitting direct drive targets, at least if zooming is required. This change was already included in Ken's SEAB presentation. Also, the plans to hit a target with a low current ion beam next year have been cancelled. The attached word file has been modified to reflect these changes. Best regards, Ron

Ken Schultz Wed 30 June 1999 9:22 Subject: Ken's Reply To Mohamed Mohamed, You asked for Opinion Papers and Commentary for our SnowMass web pages. I request that you post the attached as Opinion Papers on PQ#3 IFE Target Technologies web pages: 1. FESAC 2 pager on IFE Target Fabrication 2. FESAC 2 pager on IFE Target Injection & Tracking 3. pdf file of SEAB show on IFE Target Fabrication and Injection 4. Section from IFE Development Plans dealing with IFE Target Technologies I hope these help. Thanks Ken

Ron Petzoldt Wed 30 June 1999 9:22 Subject: Comment Relating to Target Technology   Here are some comments relating to the target technology R&D file. The first two have been recognized after the file was written. The last one is a little wishful thinking on my part.   Target heating effects persist after heat is removed as the heat conducts through the material. Post heating test characterization might not give an accurate description of the target at the time that it would have been hit by driver beams.   We are currently planning direct drive target injection speeds less than 1000 m/s. 2000 m/s requires a very long accelerator distance with the expected limits on target acceleration. It also places extreme requirements on driver beam timing accuracy and probably does not improve target heating response in a gas filled chamber.   Does the foam in a target significantly affect the strength of the DT? If foam increases the strength, can the foam be used throughout the target, without unacceptably reducing target gain? Does foam reduce or mitigate the effects of stress induced DT cracking? If these questions are answered favorably, larger target injection acceleration might be possible.

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