Been there and got a wardrobe full of T-shirts as the saying goes. 4 years is pretty good going if the machine is heavily used. Ours went alot faster but the machine was used 24/7. We went through about a mirror a year for a while. The old 1st generation mirrors could be cleaned in-house with care but the Ni/C ones can't. Keeping the humidity low helps prolong the life, as does not using cooling water that's too cold. Sealed Goebel mirrors do exist that were designed for use with rotating anode systems. The mirror is surrounded by a Be box filled with inert gas I believe. I eventually got one for our old twin mirror system, and it hasn't shown any intensity loss that I've noticed. I'm afraid this doesn't help an existing mirror problem, but the sealed unit might be worth investigating for new purchases (although you may have to ask for them specially as they're not standard for XRD units). Pam
________________________________ From: Tim Hyde [mailto:[EMAIL PROTECTED] Sent: Tue 30/10/2007 1:08 PM To: [email protected] Subject: Bruker Gobel Mirrors Dear all, We have had some problems with our Ni/C 60mm length Gobel (Goebel) mirrors. I believe "2nd Generation" purchased 2003. We now realise that over a period of time deposits have built up in the mirror giving up to 60% reduction in intensity and additional low intensity "peaks". I was wondering if this is an issue known to the community. Bruker can refurbish our original mirrors. Anyone have knowledge of how efficient this process is? If you have had similar problems and have fixed them please get in touch. Regards Tim Hyde Dr Tim Hyde Principal Scientist Johnson Matthey Technology Centre Blounts Court Sonning Common Reading RG4 9NH Tel: +44 (0) 118 924 2152 Fax: +44 (0) 118 924 2254 email [EMAIL PROTECTED] If the reader of this email is not the intended recipient(s), please be advised that any dissemination, distribution or copying of this information is strictly prohibited. Johnson Matthey PLC has its main place of business at 40-42 Hatton Garden, London (020 7269 8400). Johnson Matthey Public Limited Company Registered Office: 40-42 Hatton Garden, London EC1N 8EE Registered in England No 33774 Whilst Johnson Matthey aims to keep its network free from viruses you should note that we are unable to scan certain emails, particularly if any part is encrypted or password-protected, and accordingly you are strongly advised to check this email and any attachments for viruses. The company shall NOT ACCEPT any liability with regard to computer viruses transferred by way of email. Please note that your communication may be monitored in accordance with Johnson Matthey internal policy documentation.
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