[Halld-tagger] Hall D Cable Assignment

[Fernando J Barbosa]

Hi all,

The labels for the cables have been set a long time ago and I previously 
referenced a document I have on the portal. For the tagger, the cables 
are labeled as TAGM ... for microscope and TAGH ... for the hodoscope. 
These are already being delivered by the manufacturer. As there was no 
mention in this email thread of grouping channels per ADC module, I will 
assign this part.

We have not discussed the splitters and these will need to be added to 
the schedules and to a new ETC. Most likely, these will be rack-mounted 
chassis. Any suggestions on the split ratio? Keep in mind the signal 
amplitudes after the passive split and the ADC setting ranges (0.5V, 1V 
and 2V).

Yes, there will be a few spare cables per detector. I ordered about 10% 
extra per cable type but not all of these will be installed. Let me know 
if you believe there will be a need for a set number of spares.

Best regards,
Fernando



On 6/21/2012 3:38 PM, Alexander Somov wrote:
>
> Hi Fernando,
>
> I absolutely agree with Liping and Richard regarding the spare
> cables. It would make sense to have a few 'extra' cables for
> all beam line (probably all other) detectors.
>
> Using a separate letter 'S' would be more logical, MIC(FA,PS2)-S-...
> I was thinking of using the same label A for the signal/ADC cables,
> and distinguishing TDC cables by letter 'T'. By the way, how the
> splitters will look like (the small box for each individual channel
> as we used for the prototype testing, or you'll design a compact 
> multi-channel module; it will not be a crate based module I guess) ?
>
> Thanks,
>        Alex
>
>
>
> On Thu, 21 Jun 2012, Richard Jones wrote:
>
>> Fernando,
>>
>> Alex has already sent you a proposed naming scheme for the cables 
>> connecting the tagging counters to the electronics racks.  Here is 
>> some further elaboration to explain how the cabling should be 
>> configured.  It applies to the microscope (MIC-xxx), and perhaps to 
>> the fixed array (FA-xxx) channels as well.
>>
>> 1. There should be only one coax cable per electronic signal running 
>> from the detector to the electronics racks.  This signal will be 
>> split at the electronics racks, and short cables run from the 
>> splitter outputs to the discriminator input (split output 1) and the 
>> fadc input (split output 2).
>> 2. These short cables should be long enough to span the height of one 
>> rack, but not much more.
>> 3. The names requested by Alex, MIC-T-nnn and MIC-A-nnn, are only 
>> appropriate for these short cables that come after the splitter.  
>> Before the splitter, these two are one and the same signal, and 
>> should be distinguished by names of their own.
>> 4. For the long cables from the microscope to the racks (before the 
>> splitter), I suggest the following naming scheme: MIC-S-nnn where nnn 
>> runs from 1 to 122.
>>
>> I also echo Liping's desire to have a few extra cables run along the 
>> long route from detector to racks, just because it would be 
>> disruptive to try to replace a few broken cables once they are laid 
>> in the trays.  I leave to your discretion how many extra would be 
>> desirable.  Perhaps there is a policy for other detectors that you 
>> could apply to us.  For these, one might just extend the above 
>> scheme, for example letting nnn go from 1 to 135 instead of 1 - 122.
>>
>> -Richard Jones
>>
>>
>>
>>
>>
>> On 6/21/2012 9:41 AM, Alexander Somov wrote:
>>> Hi Fernando,
>>>
>>>
>>> Here are cabling schemes for the PS, the  microscope,
>>> and the fixed-array counters. I would not put fadc
>>> channel on labels. If some fadc channels are dead, the
>>> cabling is screwed up. I assume that labels are the same
>>> on both cable ends; we don't have many channels in
>>> these detectors.
>>>
>>> Cheers,
>>>          Alex
>>>
>>>
>>> P.S. Richard, Franz, please take a look on the microscope
>>> and fixed array labling
>>>
>>>
>>>
>>>
>>> Pair Spectrometer
>>> -----------------
>>>
>>> DET - SIDE - FADC/TDC - CH
>>>
>>> 1. Fine Granularity (128 + 128 = 256 channels)
>>>
>>> PS1 - 1 - A - 1
>>> ..............
>>> PS1 - 1 - A - 256
>>>
>>>
>>> PS1 - 2 - A - 1
>>> ..............
>>> PS1 - 2 - A - 256
>>>
>>> 2. Low granularity ( 8 + 8 = 16 channels)
>>>
>>> PS2 - 1 - A - 1
>>> ...............
>>> PS2 - 1 - A - 8
>>>
>>>
>>> PS2 - 1 - T - 1
>>> ...............
>>> PS2 - 1 - T - 8
>>>
>>>
>>> PS2 - 2 - A - 1
>>> ...............
>>> PS2 - 2 - A - 8
>>>
>>>
>>> PS2 - 2 - T - 1
>>> ...............
>>> PS2 - 2 - T - 8
>>>
>>>
>>>
>>> Fixed Array (190 channels)
>>> --------------------------
>>>
>>> DET - FADC/TDC - CH
>>>
>>> FA - A - 1
>>> ............
>>> FA - A - 190
>>>
>>>
>>> FA - T  - 1
>>> ............
>>> FA - T  - 190
>>>
>>>
>>> Microscope (120 + 2 = 122 ch)
>>> -----------------------------
>>>
>>> DET - FADC/TDC - CH
>>>
>>> MIC - A - 1
>>> ...........
>>> MIC - A - 122
>>>
>>>
>>> MIC - T - 1
>>> ...........
>>> MIC - T - 122
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>