[Halld-tracking-hw] [Fwd: RE: Straws]

[Curtis A. Meyer]

Hi Tim

    Yes, 100 Ohms is probably a fair number. We see between 75 and 85 
Ohms on the
good ones and 300-500 Ohms on the bade ones.

     Curtis


On 11/11/10 1:13 PM, Tim Whitlatch wrote:
> Hi All,
>
> Patrick Hester has just returned an email asking what limit we have on 
> surface resistance from one end to the other. Should we just call it 
> 100 ohms max?
>
> Tim
>
> -------- Original Message --------
> Subject: 	RE: Straws
> Date: 	Thu, 11 Nov 2010 17:15:28 -0000
> From: 	Patrick Hester <Patrick.Hester at lamina.uk.com>
> To: 	Tim Whitlatch <whitey at jlab.org>
> CC: 	<nsj at cmu.edu>, "Dave Clement" <Dave.Clement at lamina.uk.com>
> References: 	<4CD83BDA.90907 at jlab.org>
>
>
>
>
>
> Dear Tim,
>
> I had a long discussion with Naomi Jarvis this afternoon regarding the
> problem of increased surface resistance found on some of the last batch
> of straws. All the straws came from a single delivery of coated film
> made in one batch. The first straws were made from material which was
> slit and which we had in stock as slit film. The balance was from
> another roll of film which came from the same mill roll.
>
> It would appear that there is a coating fault maybe on one side of the
> roll which has affected some straws due to the coating being below 300
> Angstroms. We had shipped the balance of your order today but I have
> been able to intercept it before it was loaded onto the aircraft and it
> is being returned to Lamina.
>
> We checked the straws for continuity but not their actual surface
> resistance. This will now be done before they are reshipped. Please
> confirm the resistance limits required over the length of a straw so
> that we are able to check them thoroughly against your requirements. I
> will make immediate arrangements to source more coated film from a
> different supplier to make up the shortage you may encounter due to this
> problem.
>
> Please rest assured that Lamina is treating this matter seriously and
> will rectify the fault in the material. I look forward to your
> instructions. Kind regards. Patrick Hester.
> -----Original Message-----
> From: Tim Whitlatch [mailto:whitey at jlab.org]
> Sent: 08 November 2010 18:05
> To: Patrick Hester
> Subject: Straws
>
> Hi Patrick,
>
> We are finding that some of the straws have a higher surface resistance
> than the majority. Is there a separate batch that was used for some
> straws? Please call me.
>
> Thanks,
>
>         Tim
>
>
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>
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-- 
Prof. Curtis A. Meyer		Department of Physics
Phone:	(412) 268-2745		Carnegie Mellon University
Fax:	(412) 681-0648		Pittsburgh PA 15213-3890
cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/


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