[PRad] draft presentation

[gasparan at jlab.org]

  Eugene,

 The part "expected results" should not be in my talk, Haiyan is covering
that part.
 That is good enough.

 Ashot


> I think the transporter will allow control on the millimeter level.
> Why would it move from the position if the motors are not moving?? Are you
> expecting an earthquake? We will have to disconnect and lock/tag power for
> the motor drivers once it is in position before we attach the pipe to the
> window. This is very important! If it moves, it breaks the window.
> We still have time to think about it and may be check with Dave Kashy who
> designed it.
>
> On the other subject. I think it would be good if you put direct answers
> to appropriate items from the report. The items are listed on the agenda
> next to your talk.
>
> -Eugene
>
> ----- Original Message -----
>> From: "Ashot Gasparian" <gasparan at jlab.org>
>> To: "Eugene Pasyuk" <pasyuk at jlab.org>
>> Cc: "Ashot Gasparian" <gasparan at jlab.org>, "prad" <prad at jlab.org>
>> Sent: Wednesday, March 23, 2016 7:39:31 PM
>> Subject: Re: [PRad] draft presentation
>
>> If we can position the HyCal in the beam with a +/- 1. mm
>> accuracy without taking it from the Transporter then we can
>> go with that option. There is one more question on this way:
>> how we are going to keep that alignment for 3 days?
>> If it is also possible then we go with that option.
>>
>> Ashot
>>
>>
>>>
>>>
>>> -Eugene
>>>
>>> ----- Original Message -----
>>>> From: "Ashot Gasparian" <gasparan at jlab.org>
>>>> To: "Eugene Pasyuk" <pasyuk at jlab.org>
>>>> Cc: "Ashot Gasparian" <gasparan at jlab.org>, "prad" <prad at jlab.org>
>>>> Sent: Wednesday, March 23, 2016 5:59:18 PM
>>>> Subject: Re: [PRad] draft presentation
>>>
>>>> Okay, there is still the HyCal question open to me. I agree that we
>>>> can
>>>> survey GEMs
>>>> vs. HyCal when HyCal is on the Transporter. But, we can not position
>>>> and
>>>> survey the
>>>> HyCal in the beam position without taking it off from the Transporter.
>>>> I am not sure how we can position HyCal on the beam without surveying
>>>> it.
>>>> Also, it
>>>> needs to be fixed in the beam position.
>>>> I tend to go with a ~4 hours of technicians work but have a provided
>>>> measurements.
>>>>
>>>
>>> We always can survey HyCal in Hall coordinates. The alignment is
>>> another
>>> story. Yes, we won't be able to do fine tuning (pitch/yaw/roll and Z
>>> translation). But we still can do X and Y translation using transporter
>>> to
>>> align hycal face centered on the geometrical beam axis. Survey guys can
>>> tell us how much up/down left/right to move. And they can tell tell us
>>> pitch/yaw/roll angles. We won't be able to adjust them but we will know
>>> them. My claim that for the short test run since HyCal is not
>>> calibrated
>>> anyways these angles are not very important if they are not 0. We will
>>> have to redo all the alignment procedures in May. For the test run the
>>> goal is to learn how to do that. THe other goal is to see that all the
>>> electronics and DAQ works as we want it.
>>>
>>>> Please comment on this.
>>>>
>>>> Also, can you put together those items for the Target sell alignment
>>>> procedure?
>>>
>>> I can try to write it up but I need some numbers from Chris: horizontal
>>> and distances to the edges of the quadrants.
>>>
>>>> Thanks,
>>>> Ashot
>>>>
>>>>
>>>>>
>>>>>
>>>>> -Eugene
>>>>>
>>>>> ----- Original Message -----
>>>>>> From: "Ashot Gasparian" <gasparan at jlab.org>
>>>>>> To: "Eugene Pasyuk" <pasyuk at jlab.org>
>>>>>> Cc: "Ashot Gasparian" <gasparan at jlab.org>, "prad" <prad at jlab.org>
>>>>>> Sent: Wednesday, March 23, 2016 5:10:39 PM
>>>>>> Subject: Re: [PRad] draft presentation
>>>>>
>>>>>> Eugene,
>>>>>>
>>>>>> Here are some discussions:
>>>>>> 1) If we keep HyCal on the transporter we can not put accurately
>>>>>>    enough in the beam and survey it (with the GEM).
>>>>>
>>>>> Here are my thoughts why.
>>>>> GEM can be surveyed relative to HyCal regardless of whether it is on
>>>>> the
>>>>> cart or on the transporter.
>>>>> I agree that when HyCal is on the transporter we don't have Z-degree
>>>>> of
>>>>> freedom. But for the test run it is not very important. If we put it
>>>>> on
>>>>> the cart now, we will have to put it back on the transporter for
>>>>> calibration in May and then back to the cart. This will save time and
>>>>> efforts.
>>>>>
>>>>>> 2) We need to protect the rest of the setup while accelerator is
>>>>>>    tuning the beam. The "Beam block" is in between two collimators.
>>>>>>    We have done that in past many times. Are you referring to legal
>>>>>>    terminology (safety) or a technical possibility?
>>>>>
>>>>> It's terminological. Also there is empty space between the
>>>>> collimator.
>>>>> To
>>>>> block the beam we would need to move collimator by an inch or so from
>>>>> the
>>>>> nominal position. You want protection from tagger magnet trip. There
>>>>> is
>>>>> an
>>>>> FSD interlock for that, machine shuts down if magnet trips.
>>>>>
>>>>>> 3)for the "dropping 1(bcdf) items, I do not see a connection with
>>>>>> HyCal
>>>>>>   being in the beam. I think we need to see the quality of the
>>>>>> e-beam
>>>>>>   by scanning it with the upstream harp. Are you questioning the
>>>>>>   detection part of the harp?
>>>>>
>>>>> No, we will do harp studies. These items are about photon radiator
>>>>> which
>>>>> we do not need. We can leave for the very end if we have time.
>>>>>
>>>>>> 4) for the part 2(lmn), yes it is utilizing the additional foils
>>>>>> with
>>>>>>    quadrants. Do you want to change the wording?
>>>>>
>>>>> It is not just change of wording, it is a bit different procedure. We
>>>>> have
>>>>> a rough idea but we need to spell it out step by step.
>>>>>
>>>>>> 5) yes, I will add the GEM timing part.
>>>>>>
>>>>>> Please comment, the HyCal in the beam is important question.
>>>>>>
>>>>>> Ashot
>>>>>>
>>>>>>> Some comments on the Run Plan.
>>>>>>>
>>>>>>> We should keep HyCal on the transporter for the test run.
>>>>>>>
>>>>>>> 1. There is no "Beam block" position for the collimator. We should
>>>>>>> use
>>>>>>> FSD
>>>>>>> interlock with tagger magnet power supply.
>>>>>>>
>>>>>>> Drop 1(b,c,d,f) It is pointless because HyCal will not be in the
>>>>>>> beam.
>>>>>>>
>>>>>>> Cell alignment procedure 2(l,m,n) should be changed to utilize
>>>>>>> additional
>>>>>>> foils with quadrants.
>>>>>>>
>>>>>>> Add GEM trigger delay adjustment.
>>>>>>>
>>>>>>> -Eugene
>>>>>>>
>>>>>>> ----- Original Message -----
>>>>>>>> From: "Ashot Gasparian" <gasparan at jlab.org>
>>>>>>>> To: "prad" <prad at jlab.org>
>>>>>>>> Sent: Wednesday, March 23, 2016 4:09:15 PM
>>>>>>>> Subject: [PRad] draft presentation
>>>>>>>
>>>>>>>> Hi All,
>>>>>>>>
>>>>>>>> The draft of my presentation is attached. I am still working on
>>>>>>>> the
>>>>>>>> formating
>>>>>>>> part so, please check the information and the numbers for now.
>>>>>>>>
>>>>>>>> Kondo, please check the "GEM Requirement" slides and let me know
>>>>>>>> if
>>>>>>>> some
>>>>>>>> numbers need to be corrected.
>>>>>>>>
>>>>>>>> Thank you,
>>>>>>>> Ashot
>>>>>>>>
>>>>>>>> _______________________________________________
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>>>>>>>> PRad at jlab.org
>>>>>>>> https://mailman.jlab.org/mailman/listinfo/prad
>