Re: scint repair

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

Dear Peter, 
 Glad to hear the damage was just incidental.
 I just used some non-reagent alcohol on the surfact to clean any residual
glue from the initial gluing.  

 There is a box labeled "detector repair box" in the bottom of the mulan
cabinet.  There should be a surplus of light tight black paper in this box
(or on top of it).  The key should be in the mulan barrack, David says.

Please let me know if you need further assistance,

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   
> 
>