[Dsg-rtpc] [EXTERNAL] Re: RTPC Cable Length

Wed Nov 6 11:31:52 EST 2019

This (attached) should clear things up, and may even be worthy of a spot in the wiki.

- Cyril
________________________________
From: Eric Christy <meric.christy at gmail.com>
Sent: Tuesday, November 5, 2019 9:53 AM
To: Sebastian Kuhn <kuhn at jlab.org>
Cc: Bob Miller <rmiller at jlab.org>; Carlos Ayerbe Gayoso <gayoso at jlab.org>; JIWAN POUDEL <jpoud001 at odu.edu>; Brian Eng <beng at jlab.org>; Nathan Baltzell <baltzell at jlab.org>; Eric Christy <christy at jlab.org>; Bill Crahen <wcrahen at jlab.org>; dsg-rtpc at jlab.org <dsg-rtpc at jlab.org>; Cyril Wiggins <cwiggins at jlab.org>
Subject: Re: [EXTERNAL] Re: [Dsg-rtpc] RTPC Cable Length

For reference, the gas tubing epoxied to the detector front plate are all at least 20 cm long and have push-pull connectors.   The RTD temperature probes mounted in the detector have about 40cm of cable length.   I can send exact lengths and pictures later today.

-Eric

On Tue, Nov 5, 2019 at 9:46 AM Sebastian Kuhn <kuhn at jlab.org<mailto:kuhn at jlab.org>> wrote:
Dear all,

the cables in question are for the temperature sensors that are installed on the front face of the RTPC, just like the gas tubing. Hence, the total length from the detector to the gas panel will have to be similar to that for the TOTAL length of gas tubing. As Bob pointed out, this actually is made of 2 parts - from the detector to an interconnect at the SVT mount, and from there to the gas panel. I hope that either Bob or Cyril can provide us for the actual lengths of BOTH parts, which we will have to add together for the total length of cabling needed to the gas panel. I suspect it will be a bit more than 15’, because of the “obstacles” that Carlos mentioned. We can then have one interconnect on the gas panel and then have the 2nd set of cables from there to the electronics, which Bob already has the length of.

- Sebastian

On Nov 5, 2019, at 8:52 AM, Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org>> wrote:

The gas tubing length discussed below is from the gas panel to the SVT mount, where the gas lines will have a bulkhead fitting.  There will be separate gas lines from the bulkhead fitting to the detector.

I don't know where your detector cables are starting, or ending.  Therefore, I don't know if basing their lengths off of the gas line lengths is appropriate.

Bob

On 11/4/2019 9:06 PM, Carlos Ayerbe Gayoso wrote:
NOW we have some numbers!!

Thank you Jiwan!!
________________________________
From: JIWAN POUDEL <jpoud001 at odu.edu><mailto:jpoud001 at odu.edu>
Sent: Monday, November 4, 2019 9:03 PM
To: Carlos Ayerbe Gayoso <gayoso at jlab.org><mailto:gayoso at jlab.org>
Cc: Brian Eng <beng at jlab.org><mailto:beng at jlab.org>; Sebastian Kuhn <kuhn at jlab.org><mailto:kuhn at jlab.org>; Bob Miller <rmiller at jlab.org><mailto:rmiller at jlab.org>; Nathan Baltzell <baltzell at jlab.org><mailto:baltzell at jlab.org>; Eric Christy <christy at jlab.org><mailto:christy at jlab.org>; Bill Crahen <wcrahen at jlab.org><mailto:wcrahen at jlab.org>; dsg-rtpc at jlab.org<mailto:dsg-rtpc at jlab.org> <dsg-rtpc at jlab.org><mailto:dsg-rtpc at jlab.org>
Subject: [EXTERNAL] Re: [Dsg-rtpc] RTPC Cable Length

Hello Carlos,

During the test of new gas panel, Bill Crahen sent this about the length of the tubing:

"I just talked to Cyril, and he shows a straight line distance of about 11', so figure perhaps 15' actual length, and shorten your supply line to match.”

So Bill and Bob made the tubing of gas panel at EEL accordingly. I have also cc’ed Bill Crahen, so he might answer it correctly if anything changed!!

Thank you,
Jiwan

On Nov 4, 2019, at 8:20 PM, Carlos Ayerbe Gayoso <gayoso at jlab.org<mailto:gayoso at jlab.org>> wrote:

allow me to rephrase Brian,

the requested length of the cables SHOULD be (approximately) the same as the length of the gas tubing between the detector and the panel. Since that distance is not the shortest one due to all the obstacles and provisions between those elements (panel and detector), both (cable and tubing) will share the same path and will be quite longer than the evident path.

I think that length is already (more or less) well determined, but unknown for many, including me.

Cheers

-Carlos
________________________________
From: Dsg-rtpc <dsg-rtpc-bounces at jlab.org<mailto:dsg-rtpc-bounces at jlab.org>> on behalf of Brian Eng <beng at jlab.org<mailto:beng at jlab.org>>
Sent: Monday, November 4, 2019 7:44 PM
To: Sebastian Kuhn <kuhn at jlab.org<mailto:kuhn at jlab.org>>
Cc: dsg-rtpc at jlab.org<mailto:dsg-rtpc at jlab.org> <dsg-rtpc at jlab.org<mailto:dsg-rtpc at jlab.org>>; Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org>>; Nathan Baltzell <baltzell at jlab.org<mailto:baltzell at jlab.org>>; Eric Christy <christy at jlab.org<mailto:christy at jlab.org>>
Subject: Re: [Dsg-rtpc] RTPC Cable Length

Bob has already provided the length between the electronics and the gas panel, so that part is established.

As for the connectors I only ordered enough for 1 level of disconnect.

What we don't have yet is the length from the panel to the detector.

________________________________________
From: Sebastian Kuhn <kuhn at jlab.org<mailto:kuhn at jlab.org>>
Sent: Monday, November 4, 2019 7:20 PM
To: Brian Eng
Cc: dsg-rtpc at jlab.org<mailto:dsg-rtpc at jlab.org>; Nathan Baltzell; Narbe Kalantarians; Bob Miller; Eric Christy; Hattawy, Mohammad
Subject: Re: RTPC Cable Length

Dear Brian,

we briefly discussed this issue at today’s BONuS12 engineering meeting. Basically, there are several possible intermediate steps to consider: The cables that are fixed to the probes should have connectors for easy installation together with the RTPC. The second step would be from those connectors to the gas panel. Finally, my understanding is that the crate containing the electronics for the gas system controllers will be some distance away (but on the same space frame level), on the North Side. (Nathan, please correct me if I’m wrong). I don’t know what that distance is, but maybe some of the other people cc’d on this email can answer.

Greetings - Sebastian

On Nov 4, 2019, at 9:55 AM, Brian Eng <beng at jlab.org<mailto:beng at jlab.org><mailto:beng at jlab.org>> wrote:

Hi Sebastian,

Do you have this information? If you have the length between the gas panel and the detector I can just add that to the length Bob is providing.

Who is fabricating the RTD cable? I'd assume we (DSG) are, but best to make sure before we order anything.

Thanks
--
Brian Eng
Detector Support Group
757-269-6018

Begin forwarded message:

From: Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org><mailto:rmiller at jlab.org>>
Subject: Re: RTPC Cable Length
Date: November 4, 2019 at 7:14:43 AM EST
To: Brian Eng <beng at jlab.org<mailto:beng at jlab.org><mailto:beng at jlab.org>>

Hi Brian,

I can get you a cable length for the gas panel tomorrow.

Please contact Sebastian Kuhn about detector cables.  He was in the Hall last week and came up with a plan, I don't know if he considered RTDs.

Thanks,

Bob

On 11/1/2019 6:02 PM, Brian Eng wrote:
Hi Bob,

Is there a distance for the cables calculated yet?

We need one for the cables between the cRIO (on SFL1N that we moved to) and the gas panel and also one for the cRIO to the detector itself (for RTDs).

Thanks

--
Bob Miller
Hall B Lead Engineer
Jefferson Lab
757 822-9586

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--
Bob Miller
Hall B Lead Engineer
Jefferson Lab
757 822-9586

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