[Clas12_rich] RICH task list questions

[Marco Contalbrigo]

Dear Tyler,
as we are preparing for the readiness review and working with the 
companies for the RICH components, we are in a prettu busy period.
As a consequence, please do not expect fast responses from us.

We can discuss some points while being at JLab next week.
However, I anticipate here few comments which have some relevance
for the readiness review. This is our priority right now.

Thanks, Marco.



On Thu, 2 Jun 2016, Tyler Lemon wrote:

> Hello All,
> 
> The following points that need to be addressed for the RICH detector:
>
>  1. Have the bolt size and lift points for the assembly structure been determined?

Are we expecting an approval from some authority here ? In any case, we 
are going to submit the information to the Hall-B engineers.

>  2. What is the status of the ASME relief valve approval for the cooling system?

We are in contact with Mandal and Goerge and working on it.

>  3. What are the delivery dates for the remaining mirror shipments?

No definite date yet, but most likely during the summer.

>  4. Air compressors:
>      1. George will look into the compressors with the information Sandro sent on 6/1/2016. However, I was not able to find the exact SF11-8
>         MC FF model in the brochure linked in the email.
>  5. The space on the Forward Carriage will be measured to ensure the compressors and air tank will fit.

May you take some photos of the area and location ? It could be useful to 
have them during the readiness review.

>  6. Safety documentation:
>      1. Is the THA correct?

I consider the THA correct.

>      2. Who will be writing the Operational Safety Procedure (OSP) for the detector?

An OSP is welcome, but to my understanding you need OSP only if the
risk after mitigation is still above 1. Am I wrong ?

>  7. Aerogel delivery:
>      1. What are the delivery dates for the remaining aerogel shipments?

Likely you will get 6 tiles in June and additional 8 (partial) tiles in 
July.

>      2. Since Valery mentioned that the moisture can be heated out of the aerogel, I guess it wouldn't be an issue to store the aerogel in
>         the open cleanroom since space is running out in the dry boxes.

As I explained in my previous mail, the moisture can have irreversible
effects on aerogel on a long-term scale. Hence we should store aerogel
on dry cabinets.

>  8. What are the delivery dates for the electronics?
>      1. Mindy will help with any hardware work for the assembly of the electronic panel and the fabrication of any cabling needed.

This is a good news. We will have by sure a fraction of the boards ready
in July, when Matteo will be at JLab to set-up the calibration procedures.
I am fighting to have the production done before the summer break, but
I am not sure I will accomplish it.

>  9. The interlocks system and cRIO parts list is attached. Please note the pricing and quantity of some items are yet to be determined and
>     for those items, a rough cost estimate is provided. Also, please note that the list does not account for any spare parts.
> 10. Interlock system sensors:
>      1. What are the number of variables that need to be monitored?
>      2. What space is available for the sensors within the detector?
>      3. Humidity sensors:
>          1. What precision of measurement is needed? The sensor you suggested measures to +/- 1.8 % relative humidity; the sensors used to
>             monitor the SVT humidity measure to +/- 3.5% relative humidity. Since Valery mentioned the humidity would not be a big issue and
>             can be heated out of the aerogel, would the SVT sensors be okay?
>          2. How many humidity sensors are needed?
>          3. Where is the placement of the humidity sensors within the detector?
>      4. Temperature sensors:
>          1. What is the precision of measurement needed?
>          2. How many temperature sensors are needed?
>          3. Where is the placement of the temperature sensors in the detector?
>      5. Air flow sensors:
>          1. What is the precision of measurement needed?
>          2. How many air flow sensors are needed?
>          3. What type of air flow sensors should be used?
>          4. How much space is there available for the sensors inside the detector?
>          5. Where is the placement of the air flow sensors in the detector?

I suggest we discuss these things in person next week.

> 11. PCs for testing:
>      1. Amrit informed me on his return that the PCs I have previously said that would be available for use would be needed soon for other
>         projects (my apologies on the miscommunication).
>      2. Are there PCs that could be brought for the testing?
>      3. Who would buy the PCs and monitors if they need to be bought?

We will figure out how to best proceed. For the moment, it is important
to have at least one PC available till the 23th of June for the mirror 
testing. Will one of the PCs be available till then  ?
I do not remember: has your PCs an USB3 port ?

> 12. The PCs for the mirror testing would have to go on the guest network.
>      1. Is the guest network okay?
>      2. Is a network connection even needed for the tests?

Guest network is ok. Yes a network would be nice, in order to
get access to Ferrara computers and the codes/data stored there.

For the mirror testing, we may benefit in addition of:
- a LV power supply (maximum 12 V, 0.5 A)
- a manual translation stage to align the sensor to the mirror
center. The range should be few cm, the precision sub-mm.

Also: is there nes on the CMM machine availability ?
It will be crucial for us to have the mirror dimensions
measured while being at JLab.

> 13. What is the status on the gas systems?

We are in contact with George and waiting for Mandal comments.

> In addition to the above points, the interlock system is being developed and the specifications will be authored by Amanda for distribution.
> For the interlock system, the number of variables to be monitored, the alarms that will be set, and the trip levels will need to be
> determined.

We are happy to know Amanda is working on the interlock.
We will be glad to meet her next week to discuss the relevant 
details.

Ciao, Marco.

> 
> Sincerely,
> Tyler
> 
> 
>