[A1n_d2n] To do items from today's meeting

[Xiaochao Zheng]

Sorry, the alternate picture had a few typos. Here is a better version:

https://hallcweb.jlab.org/experiments/A1n/meetings/20180515/target_beamview_edit_alternate.png

vs. current version:

https://hallcweb.jlab.org/experiments/A1n/meetings/20180515/target_beamview_edit.png

Xiaochao


----- Original Message -----
> From: "Xiaochao Zheng" <xiaochao at jlab.org>
> To: "Jay Benesch" <benesch at jlab.org>
> Cc: "A1n d2n" <a1n_d2n at jlab.org>
> Sent: Thursday, 17 May, 2018 12:14:39
> Subject: Re: [A1n_d2n] To do items from today's meeting

> I have made a sideview of the target to show the current design vs. the two
> options proposed ("alternate"). The red is the long central foil and the blue
> is the short multi foil (the other six).  I used two other colors for the
> proposed options:
> 
> JP, what is the typical clearance we need for each beam position?
> 
> 1) Option 1 (magenta): make the foil at z=13.67cm (or -) longer, from 0.75" to
> 1.05" to make a double hole. The hole position of the central foil needs to be
> switched with the single foil position.  There is a problem with beam
> clearance, because with the new option the beam hitting the new single foil
> position is too close to the hole position (not a problem for the central foil
> but will be a problem with the new longer foil).  The new foil can be made not
> at the full length of 1.25" (0.25" longer than the short foils), hence 1.05"
> (Leaving only 0.1" for the raster).  can the beam position be moved by 0.1"
> too, to accommodate?
> 
> 2) option 2 (green): add an aluminum tube at the empty position as Brad proposed
> (and Jay liked).
> 
> Xiaochao
> 
> 
> 
> ----- Original Message -----
>> From: "Jay Benesch" <benesch at jlab.org>
>> To: "A1n d2n" <a1n_d2n at jlab.org>
>> Sent: Thursday, 17 May, 2018 11:39:15
>> Subject: Re: [A1n_d2n] To do items from today's meeting
> 
>> Ryerson stock list has 6061-T6 tubes with 7/8" OD (2.223 cm) and wall
>> thicknesses 0.035, 0.049, 0.058, 0.065, 0.083 and 0.125".   Ops can
>> thread the beam through any one of these, or a 3/4" OD tube for that
>> matter.  Same wall thicknesses available for latter.  I like Brad's idea.
>> 
>> Jay
>> 
>> https://www.ryerson.com/stocklist
>> 
>>> 
>>> the empty target position now has +/-0.522" or +/-1.325cm of space both above
>>> and below. This is the full distance to the solid target holder and to the
>>> reference cell wall.  Sounds like a 2.5cm OD Al tube is too big to fit in.
>>> Jianping probably can comment on this.
>> _______________________________________________
>> A1n_d2n mailing list
>> A1n_d2n at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/a1n_d2n
> 
> _______________________________________________
> A1n_d2n mailing list
> A1n_d2n at jlab.org
> https://mailman.jlab.org/mailman/listinfo/a1n_d2n