sPHENIX Event Plane Detector discussion

[Rosi Reed <rosijreed AT lehigh.edu>]

Hi Eric,

Yes, you have the geometry precisely correct.  There are 2 SiPM boards per sector - the "odd" one will have an empty channel. We will take your advice regarding the labeling - do you think it would also be worth adding "EPD" or is it very unlikely that once these cables are pulled, that they can get confused?  We will add getting the SC and TP cables from 912 to our list.

Regards,

Rosi

On Thu, Feb 23, 2023 at 7:47 PM Eric Mannel <mannel AT bnl.gov> wrote:

Rosi-

I am not sure that there is a "sPHENIX" specific numbering scheme.  For the oHCal. Cables were labeled by sector and position in the box (3 cables per box) e.g.  "oHCal Sect 0-1" or something like that.  For the iHCal, since it reads out North and South, an N or S was included in the sector number.  EMCal is similar, but a little schizo, since in some cases we have 0-31 N/S and in others cases we have 0-63 with 0-31 being north and 32-63 being south.  Sector 0 in the HCal/EMCal systems is the module that is at phi=0 in the sPHENIX coordinate system and the sector numbers increase in phi. This should not be confused with the module serial numbers that also range from 0-31(64) for the HCal (EMCal).

I am slowly wrapping by brain around your geometry,  but I if I have it right, you have 2 sectors mounted on a strong back and 6 strong backs per end for a total of 12 sectors  each end. What I don't understand is how your fibers in a sector map into the SiPM board. That mapping then determines how the fibers map into preamp channels and eventually the digitizer boards.  Since each sector has 31 channels as I understand it, that would suggest to me that the the cables have a labels something like this: Sect 0-AN, Sect 0-BN... Sect 11-Bn, Sect 0-AS... Sect 11-BS.

While you can use any naming scheme you want, I have always found it easiest if the label reflects the geometrical location that the cable is connected to when you try and debug things. 

As for the sequence, I think the sequence that I suggested makes the most sense, although you could do the first 2 steps, then bundle assuming you keep the 4 cables in a bundle together.  I think a 2-3 person crew could do this in less then 2 days once there is a plane.

The other thing that needs to be dealt with is the Slow Control and Test Pulse cables. I think there are a total of 4TP and 12SC cables, and we have more then enough, just a matter of getting them from 912 to the high bay and labeling them.  Again, I would label them by Sector - Position -Type where type is SC or TP. For these I would suggest using a heat shrink label (we have the printer), once printed, slide it over the end and hit it with a heat gun for a few seconds.  Once that is done, bundle them as appropriate. Again, this is a half day of work once there is a plan.

They only reason to do this soon is to schedule the cable pulling with the techs. Once we have the cables ready for pulling it will take them a couple of hours to pull them, the challenge wil be finding when those couple of hours are available.

My 2 cents.

Eric

On 2/23/2023 4:27 PM, Rosi Reed wrote:

Hi Eric and everyone,

I think your recommendation of bundles of 4 make sense - perhaps I can ask if there has been a general sPHENIX labeling scheme.  While I know that we have sEPD specific requirements, it's also nice if things follow a general trend.  (I vaguely remember that the HCAL cables had N and S, then were numbered I think starting in the inside working towards the outside (i.e. longest cable)).  I think it makes sense to do everything all at once - test, bundle and label.

Cheers,

Rosi

On Thu, Feb 23, 2023 at 12:21 PM Eric Mannel <mannel AT bnl.gov> wrote:

Jamie and Company-

I am not sure that I am on the sEPD list.

About 1/2 of the cables are individually coiled up now, so it seems to me the easiest thing to do is test them, and if they pass the test label them. Once you have  4 cables that are for a bundle, you bundle them and coil them up and sort the bundle according to which end they go on.  Most of the effort is going to be in the handling of the cables themselves.  The testing takes only a few seconds cable once you have both ends plugged in. Labling is going to be the second most time consuming, followed by the bundling.  However, given that there are only 48 cables + a few spares, it should only really take 1-2 days for 2 people once all the parts are ready to go.  On that front we have ~100 cables in the high bay and I know where another ~50 are. I have a label maker and tester for the job, so the only thing that needs to be agreed upon is what the label says and how they are bundled.

There are lot's of ways to do it, but that is how I would do it.

Eric

What was unclear to me when I talked with

On 2/23/23 10:57 AM, Jamie Nagle wrote:

Is the idea to bundle first and then test, or test individual cables and then bundle - Eric, recommendations?

Can we send this email thread to the sEPD list - just to have everyone included?

Thanks for coordinating and doing the work!

Jamie

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|| Professor of Physics, University of Colorado Boulder

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On Thu, Feb 23, 2023 at 8:51 AM Micah Meskowitz <mim219 AT lehigh.edu> wrote:

After talking with Eric and from what we know about the digitizer we're going to label the cables like the schematic attached, and bundle them in groups of 4 (i.e each group within the purple outline). Does anyone have any objections or other suggestions? Otherwise we can start testing today/tomorrow.

Best,

Micah

On Tue, Feb 21, 2023 at 8:12 PM Park, JaeBeom <jpark4 AT bnl.gov> wrote:

Hi Eric, 

OK thanks for the inputs!

I will try to reach you before lunch in 510 tomorrow. 

@Rosi, I remember you mentioned in the sepd meeting that you also have some plans for this. 

Could you maybe comment on this? 

Best,

JaeBeom

2023. 2. 21. 오후 1:46, Eric Mannel <mannel AT bnl.gov> 작성:

JaeBoam-

I think the first thing to do is to have a full plan that includes what the labeling scheme is, then test cables, label them and bundle them accordingly to minimize the work. I have the tester and label maker that you can use.  What I don't know is what the labels are and how you want to bundle them.

I am out at 1008 today and will be in 510 tomorrow between 11 and 1.

Eric

On 2/21/23 11:36 AM, Park, JaeBeom wrote:

Hi Eric, 

Let me try to jump in as I also checked the cables with and Tristan is now back at Lehigh. 

Do you think I can meet you somewhere at BNL (wherever you are) and discuss how we can proceed with he cable tests?

Best,

JaeBeom

2023. 2. 16. 오후 9:42, Eric Mannel <mannel AT bnl.gov> 작성:

Tristan, et.al-

Couple of more comments.  I located the tester and Sal is checking it out to make sure that it is 100%.  To do that, I took one cable from the bin for him to work with. Mike Lenz next week will be bringing up a box of cables from the basement.

I think the next step is to test the cables with the cable tester.  If they are good, label them according to the scheme that makes sense for the sEPD.  I have a label machine that can be used to make labels once you have a plan for labels, I think Rosi is working on that.  I did see that you bundled them in groups of 4, hopefully all in the bundle are ok after the  functional testing.  You will need to trim off the tail of the cable tie that you used to bundle the cables. You will also want to test 8 or so spares, just in case something happens while pulling the cables

As a side note,  John H and I will need 5 cables for the ZDC/SMD.  It would be very helpful if you could test those and set them aside for us.

Eric

On 2/16/2023 10:56 AM, Tristan Protzman wrote:

Hi All,

I've started a spreadsheet to track where the cables are, if they have been tested, and if there is any damage.

https://docs.google.com/spreadsheets/d/1DwB579ZCeSOMqHA7vnP2oOfRB-BONRW-ugD6di3eXKc/edit?usp=sharing

Cheers,

Tristan 

On Wed, Feb 15, 2023 at 1:53 PM Eric Mannel <mannel AT bnl.gov> wrote:

The cables are all 10m long.  I don't see the need to measure them all. 
I added 6 more cables from Mickey, and identified where more cables are
in the basement.  I am still working on trying to figure out where the
cable tester went to, since it is not where it should have been.

I think the most important thing to do is to go through the cables and
coil them up individually, test them and put labels on them that make
sense for the sEPD.  Might also want to think about bundling them in
groups of 4 to make the cable pull a little easier.  For the EMCal, this
was done out in 912.  We could think about doing it in the high bay, but
that area sees a lot of traffic.

Eric

On 2/15/23 11:51 AM, Park, JaeBeom wrote:
> Hi Rosi,
>
> I found the cables and I am going to work on it in the afternoon today with Tristan.
> We will measure the length, take pictures, and document all the information in a google doc and share it around before tomorrow.
>
> Best,
> JaeBeom
>
>
>> 2023. 2. 14. 오후 3:20, Rosi Reed <rosijreed AT lehigh.edu> 작성:
>>
>> Hi JaeBeom, Dan and Tristan,
>> We would like you to locate, measure and inspect the HBD Meritec cables that are in the highbay.  There should be 21 in a brown barrel near the test set up.  John H. believes that they are 10 m long, but please confirm (and measure all so we have an idea of their variation).  Visually inspect the connectors and the body of the cable.  Please set up some doc where you record this and send it around.  At some point soon, Eric will also find the tester for these cables.  We will need to be VERY CAREFUL when we test them, but we will want to know how many cables are functional.
>> The other 24 are connected to the EMCal sector 0 - John H. should let us know a time scale when to access these.  (Actually John, can we use this set up to check whether those 24 work in situ?)
>> Feel free to add any other folk who are there and should participate.  A picture of one of the cables would be very helpful as you are doing this.
>> Regards,
>> Rosi
>>
>> --
>> Rosi Reed
>> RHIC/AGS UEC member
>> Associate Professor, Physics Department
>> Lehigh University
>> (610)758-3907
>> 16 Memorial Drive East Office 406
>> Bethlehem, PA 18015
>> she/her/hers

--
Eric J. Mannel, Ph.D.
Research Engineer
Dept of Physics/PHENIX
Brookhaven National Laboratory
631/344-7626 (Office)
914/659-3235 (cell)

-- 
Eric J. Mannel, Ph.D.
Research Engineer
Dept of Physics/PHENIX
Brookhaven National Laboratory
631/344-7626 (Office)
914/659-3235 (cell) 

-- 
Eric J. Mannel, Ph.D.
Research Engineer
Dept of Physics/PHENIX
Brookhaven National Laboratory
631/344-7626 (Office)
914/659-3235 (cell) 

-- 
Eric J. Mannel, Ph.D.
Research Engineer
Dept of Physics/PHENIX
Brookhaven National Laboratory
631/344-7626 (Office)
914/659-3235 (cell) 

--

Rosi Reed
RHIC/AGS UEC member
Associate Professor, Physics Department
Lehigh University
(610)758-3907
16 Memorial Drive East Office 406
Bethlehem, PA 18015
she/her/hers

-- 
Eric J. Mannel, Ph.D.
Research Engineer
Dept of Physics/PHENIX
Brookhaven National Laboratory
631/344-7626 (Office)
914/659-3235 (cell) 

--

Rosi Reed
RHIC/AGS UEC member
Associate Professor, Physics Department
Lehigh University
(610)758-3907
16 Memorial Drive East Office 406
Bethlehem, PA 18015
she/her/hers