Re: scint repair

[Brendan Kiburg <kiburg@mu03.npl.uiuc.edu>]

Dear Peter, 
  I think i mispoke in the previous email.  The preferred alcohol is lower
grade alcohols (reagent) -- methanol, ethanol, or isopropanol. Isopropanol
is preferred.  Also, there should be some gloves in the detector repair
box.

Best regards,
Brendan

 

On Mon, 18 Jul 2005, Peter Kammel wrote:

> Dear Brendan,
> 
> Thanks for the info. We'll look for the glue and gun in the MuLan
> barrack (we tried the cabinet already). Nothing dramatic happened
> to the gondola, we did not notice anything during dismount, perhaps
> we were not careful enough or the joint between light guide and scint 
> was weak. The surfaces of the joints are pretty clear (not much
> glue in sight). So I am hesitant to touch them and would glue
> them as is. Did you prepare the broken MuLan surfaces with
> milling or so, or did you just reglue?
> 
> Also I am looking for some black paper. The gondolas were retrofitted
> with the black plastic foil after they were mounted to the support
> structure. For the ones we are equipping with neutron detectors, it would
> be much cleaner to make the scint light tight without wrapping the support
> PVC. 
> 
> Best regards
> 
> Peter
> 
> 
> On Mon, 18 Jul 2005, Brendan Kiburg wrote:
> 
> > Dear Peter,
> >   Sorry to hear about that.  I'm not sure exactly where the light and glue
> > source are located, but it should probably be in the mulan
> > barrak/cabinet.  It is a light colored (whitish) cardboard box about 1/2
> > meter tall and 30 cm wide/deep.  The glue is located in a small cardboard
> > box and should be with the light gun.  I believe the glue was reaching/has
> > reached the expiration date, but in principle should still work...
> > 
> > To use:
> > 1) Safety : Go into a closed room or cover the barrack windows to protect
> > bypassers.  
> >    Wear the special UV goggles,probably also with the gun/glue.  If you
> > are unsure about the quality of a pair, try putting some glue on some
> > paper, look away and see if you can harden the glue through the glasses.
> > 
> > 2) To use the gun:
> >    a) Let the gun warm up for about 10 minutes
> >    b) You need to hook the hose into a hole in the front.  The light comes
> > out through this object. 
> >    c) Set the dial to manual or timer.  It takes about 3 seconds to
> > harden the glue if you shine the light directly on it.  We typically used
> > two passes of 20 seconds to cover the whole area.
> >    d) The foot pedal turns on the gun and the timer should set it off
> > 
> > 3) Technique
> >    a) For the mulan detectors I used about 5 "drops" from the glue tube to
> > cover the pmt area.  I'm not quite sure how to scale this to the gondola
> > edge, but I don't think an excess should be problematic
> >    b) Sweep the UV light back and forth through the light guide onto the
> > glue.  
> > 
> > Ok, hope this helps.  Please let me know if you need more instructions.
> > 
> > By the way, how did the gondola break?  It wasn't a falling neutron
> > detector, was it? No catastrophe, I hope...
> > 
> > Best regards,
> > 
> > Brendan
> >   
> > 
> > 
> > n on, 18 Jul 2005, Peter Kammel wrote:
> > 
> > > Dear Brendan,
> > > 
> > > We are dismounting the gondolas and already had one
> > > glue joint broken :(
> > > 
> > > Is the UV light plus glue still at PSI? If yes
> > > please send us instructions on the proper
> > > procedure, as we have not used it before.
> > > 
> > > Many thanks and regards
> > > 
> > > Peter
> > > 
> > > 
> > 
> 
> Peter Kammel  /  pkammel@uiuc.edu
> Department of Physics, Loomis Laboratory
> University of Illinois at Urbana-Champaign
> 1110 West Green Street, Urbana, IL 61801 
> Tel (217) 333-5424 / Fax (217) 333-1215   
> 
>