Re: Cathode vibration- how to dampen?

[Tim Whitlatch <whitey@jlab.org>]

Hi Daniel,

There have been some studies done int the test lab on vibration sources. 
I will dig them up.

Cheers,

       Tim

Daniel S. Carman wrote:
> Elke,
>
> I understand from recent conversations that Tim has a list of
> vibration sources in the Hall.  We will look to calculate the
> natural frequency of vibration of the cathodes and then perhaps
> devise a simple measurement to verify.  I will keep you informed
> on what we learn.
>
>
> 				Regards,
>
> 					Daniel
>
>
> **********************************************************************
> *                                                                    *
> * Dr. Daniel S. Carman                   e-mail : carman@jlab.org    *
> * Staff Scientist                        office : (757)-269-5586     *
> * Jefferson Laboratory                   web: www.jlab.org/~carman   *
> *                                                                    *
> **********************************************************************
>
>
>
> On Fri, 22 Feb 2008, Elke-Caroline Aschenauer wrote:
>
>   
>> On Wed, 20 Feb 2008, Tim Whitlatch wrote:
>>
>> Dear all,
>>
>> one other thing to investigate before doing a lot work is what is in the
>> environment of the fdc which could cause vibrations, like pumps.
>>
>> Cheers elke
>>
>>
>>
>>     
>>> Date: Wed, 20 Feb 2008 14:22:39 -0500
>>> From: Tim Whitlatch <whitey@jlab.org>
>>> To: wcrahen <wcrahen@jlab.org>, halld-tracking-hw@jlab.org
>>> Subject: Re: Cathode vibration- how to dampen?
>>>
>>> Thanks for the heads up Bill. This may or may not be an issue. Dan has
>>> proposed doing a simple test to determine what frequencies drive the
>>> oscillations (visible) in the cathode plane. He said the equipment is
>>> available. Before we spend any time on coming up with solutions, let's
>>> see what the natural frequencies of the plane are and what driving
>>> frequencies it will be subject to by way of Dan's simple test. There may
>>> be no issue at all.
>>>
>>> Cheers,
>>>
>>>        Tim
>>>
>>> wcrahen wrote:
>>>       
>>>> Brian stopped by to discuss vibration of the cathode planes in the
>>>> FDC- and any strategies we might have to eliminate motion. He would
>>>> like to set up a meeting. The  first thought is to attach the cathode
>>>> to the ground plane with some rohacel plugs (we can't have a complete
>>>> ring if we flow gas through the center).
>>>>         
>>>       
>>  ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
>>   )    `\                                                  -
>>  /    '. |                                                  +
>>  |       `,              Elke-Caroline Aschenauer            =
>>   \,_  `-/                                                    -
>>   ,&&&&&V         Jefferson Lab                                +
>>  ,&&&&&&&&:       HALL-D 12C / F381       121-A Atlantic Avenue =
>> ,&&&&&&&&&&;      Suite 8                 Hampton, VA 23664      -
>> |  |&&&&&&&;\     12000 Jefferson Ave                             +
>> |  |       :_) _  Newport News, VA 23606  Tel.:  001-757-224-1216  =
>> |  |       ;--' | Mail:  elke@jlab.org    Mobil: 001-757-256-5224   -
>> '--'   `-.--.   |                                                    +
>>    \_    |  |---' Tel.:  001-757-269-5352                             =
>>      `-._\__/     Fax.:  001-757-269-6331                              -
>>             +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>>
>>     

-- 
ÐÏࡱá

begin:vcard
fn:Timothy Whitlatch, PE
n:Whitlatch;Timothy
tel;work:757-269-5087
tel;fax:757-269-5279
version:2.1
end:vcard