micropot Revisited

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					          MicroPot Revisited


                  Work in Progress
                   Jaak Lippmaa
Helsinki Group, Helsinki Institute of Physics, University of Helsinki




                 Manchester, December 12, 2005                          1
                            The Revelation




Manchester 11-13 Dec 2005   MicroPot Revisited   Jaak Lippmaa   2
             So, it is back to the ...

• Detectors are not supposed to be in the
  primary beam vacuum
• Access to detectors and/or positioning
  mechanics is preferable
• Access mechanics should NOT
  complicate the re-design of the transfer
  cryostate



Manchester 11-13 Dec 2005   MicroPot Revisited   Jaak Lippmaa   3
                            Considering...

• The protons are in the pipe facing the
  wall
• And no access ”SAS” is possible through
  the QRL
• And ”Dimples” are not allowed on the
  heavy traffic side of the transfer
  cryostate
• And we really really do NOT want to
  delve into Kelvin temperature detectors

Manchester 11-13 Dec 2005     MicroPot Revisited   Jaak Lippmaa   4
                            We have to...
• After a meeting last night with Keith, Daniela,
  Andrew, Krzysztof and myself...

• Modify (if only slightly) the Micropot of
  yesterday
• So, if we do some simple trigonometry
• And take the vertical dimension of the
  detector at the beam pipe centre equal to
  8mm
• We actually have 80mm available for the
  other dimension where we only need 24mm

Manchester 11-13 Dec 2005     MicroPot Revisited   Jaak Lippmaa   5
                            Get oriented...




Manchester 11-13 Dec 2005     MicroPot Revisited   Jaak Lippmaa   6
 Which means that, what if we...

 Take the transfer
 Cryostate, and...

 Put a tube here...

  And weld it here...

  And here...

  And put a flange here...

  WE WOULD GET...


Manchester 11-13 Dec 2005   MicroPot Revisited   Jaak Lippmaa   7
        We would get a POT indeed

• Which retains Primary, Secondary,
  Tertiary and other vacuum enclosures
• Keeps detectors separated from the
  beam vacuum
• Puts detectors on the same side as the
  actuator (NB! Both are removable)
• Seals everything off with a vacuum
  shield
• Has a service port

Manchester 11-13 Dec 2005   MicroPot Revisited   Jaak Lippmaa   8
                    The LONGPOT Concept
    Proton Beam                                        Emergency Stops
                                  Tilt 13º                                                   Stepper Motor
                                                                  Bellows
   Beam Pipe                                                                Outer Weld Points




                                                                                                    Flange


Primary Vacuum
        Detector


Detector Pocket


                                          CWT              Rest Stops
        Secondary Vacuum                (optional)                                              Feedthroughs


      Manchester 11-13 Dec 2005              MicroPot Revisited               Jaak Lippmaa            9
             What needs to be done?

• We really must sit down with
  Sebastian et al. and get rid of some
  tubes here and here
• We must decide detectors
• RF shielding calculations in Cockroft
• Decide on safety pullout mech.
• Full feasibility study and risk analysis
• Design & Construction Schedule and
  active collaboration partners



Manchester 11-13 Dec 2005   MicroPot Revisited   Jaak Lippmaa   10
Manchester 11-13 Dec 2005   MicroPot Revisited   Jaak Lippmaa   11

				
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