From: Marco.Denicolai@tellabs.com
Date: Mon, 26 Jul 2004 13:20:56 +0300
Subject: RE: [TSSP] Bang energy vs. streamer length measurements
Hi Malcolm, Thanks for your feedback. I was surprised I received only two answers (including your!). Maybe most of coilers were on vacation like me. To make sure, I reposted my original email. Let's see. If nobody is interested I might have to rethink something. I have also an high speed B/W camera (5000 fps) ordered and possibly coming from Ukraina... Best Regards > -----Original Message----- > From: m.j.watts@massey.ac.nz [mailto:m.j.watts@massey.ac.nz] > Sent: 25. heinäkuuta 2004 03:38 > To: tssp@abelian.demon.co.uk > Subject: Re: [TSSP] Bang energy vs. streamer length measurements > > > Hi Marco, > Thanks for an interesting and infornmative set of > measurements. Apologies for not commenting before now (overwhelmed by > too many things). I do have a couple of comments to make which may or > may not be useful. You wrote: > > >Several trials have indicated that 20 seconds between two bang > >sequences is sufficient to ensure statistical independence. On the > >other end, it has been easy to notice measurement correlation for a > >delay of 5 - 10 seconds. > > That fits with a finding I made with one particular coil > configuration that increasing the "single-shot" frequency from about > 1Hz to 2Hz almost doubled (somewhere around 80% I would say) the > distance that a leader connected to a grounded target i.e. the > distance was adjusted for each PRF to get something like a 90% hit > rate. > > >Bang repetition can't do miracles if the bang energy is limited. > > This observation makes it clear that for a classic SG configuration, > John Freau's Pwr vs sparklength formula defines a best-you-can-do > figure for some given power input. In other words, an increase in > power in the form of increased BPS beyond this lowers what one might > term the "efficiency" of the coil. It also appears that this ties in > with John's observation that bigger bangs at lower BPS will always do > better for a given power input, at least up to some minimum BPS. > > >My personal opinion is that an increased bang frequency interacts > >with the accumulated space charge and "strightens" the leader path. > > I think the observed "sword-like" sparks in interrupted CW operation > where many tens of cycles are allowed per break supports this > observation. > > Malcolm > > ----------------------------------------- ============================================================ The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reproduction, dissemination or distribution of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. Thank you. Tellabs ============================================================
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.