[Dlsupport] task list 06/28/2016

[David Douglas]

I've convinced myself the codes use the opposite convention, so we have 
to be sure to flip signs! I'll do a sketch and send it around.

Thanks Steve, this is really helpful!

D


On 7/11/2016 2:57 PM, Stephen Benson wrote:
> Counterclockwise looking down the beam in the direction of the 
> electron movement.
>
> Steve
>
> On Jul 11, 2016, at 2:55 PM, David Douglas <douglas at jlab.org 
> <mailto:douglas at jlab.org>> wrote:
>
>> Which direction is the observer looking... at the direction from 
>> which the beam comes, or in the direction of beam motion?
>>
>> Thanks!
>>
>>
>> On 7/11/2016 2:54 PM, Stephen Benson wrote:
>>> Just for information sake, the skew quads are rotated 45 degrees 
>>> counterclockwise from their normal quad orientation.
>>>
>>> Steve
>>>
>>> On Jul 6, 2016, at 8:49 PM, David Douglas <douglas at jlab.org 
>>> <mailto:douglas at jlab.org>> wrote:
>>>
>>>> oops... one other remark: in principle, the "parity" will be 
>>>> defined by the rotation angle of the skew quad, which is either +45 
>>>> degrees or -45 degrees, looking either up-beam or down-beam... 
>>>> which translates into either positive or negative skew quad when a 
>>>> positive (horizontally focusing) normal quad is rotated.
>>>>
>>>> So, there are only 8 possible combinations for any particular 
>>>> code... ;)
>>>>
>>>>
>>>>
>>>> On 7/6/2016 10:59 AM, Michele Joyce wrote:
>>>>> Should this info be kept and maintained in the LED?
>>>>> Michele
>>>>>
>>>>> On 7/5/2016 12:26 PM, David Douglas wrote:
>>>>>>
>>>>>> Thanks Jim.
>>>>>>
>>>>>> Part of the need for the polarity check is to establish the 
>>>>>> "parity" of the skews (which differs between EPICS and codes). I 
>>>>>> don't want to introduce bias, but if we could measure the poletip 
>>>>>> field (with sign) of each quad and log it, we'll save time 
>>>>>> overall. I'll sketch up a procedure.
>>>>>>
>>>>>> Thanks
>>>>>>
>>>>>> D
>>>>>>
>>>>>>
>>>>>> On 7/5/2016 11:00 AM, Jim Coleman wrote:
>>>>>>> Hi Dave,
>>>>>>>  We haven't powered any of the 4F quads yet.  That will not 
>>>>>>> happen until the spool pieces are installed due to splitting of 
>>>>>>> the magnet. We have to perform a voltage/ current/ polarity 
>>>>>>> measurement of any magnet as part of the HCO.  I'll make sure 
>>>>>>> LCW gets put on the skews.
>>>>>>> -Jim
>>>>>>>
>>>>>>>  On 7/5/2016 10:08 AM, David Douglas wrote:
>>>>>>>>
>>>>>>>> re: #2) - please put the results of the test into the LERFLog. 
>>>>>>>> Thanks
>>>>>>>>
>>>>>>>> D
>>>>>>>>
>>>>>>>>
>>>>>>>> On 7/5/2016 10:07 AM, David Douglas wrote:
>>>>>>>>>
>>>>>>>>> Hi Jim - don't know if the following was communicated to you 
>>>>>>>>> or not, but
>>>>>>>>>
>>>>>>>>> 1) Steve asked if the 10 additional skew quads needed water 
>>>>>>>>> cooling. Answer: if the other quads are run with water 
>>>>>>>>> cooling, these will need it as well. They run at the same 
>>>>>>>>> fields as the normal quads.
>>>>>>>>>
>>>>>>>>> 2) Has each quad been polarity checked (i.e. a Hall probe put 
>>>>>>>>> on each pole of each quad)? We need to be sure there are 
>>>>>>>>> consistent sign conventions through 4F, and I'll need to know 
>>>>>>>>> what pole of each quad is at what sign and field level when 
>>>>>>>>> the usual +5A test current is being run.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> DD
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On 6/30/2016 4:32 PM, Jim Coleman wrote:
>>>>>>>>>> apologies for sending it out late
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
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