venting_pumping_lower-dipole_section_venting_pumping_lower-dipole_section
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venting_pumping_lower-dipole_section_venting_pumping_lower-dipole_section [2017/06/13 12:13] pereira created |
venting_pumping_lower-dipole_section_venting_pumping_lower-dipole_section [2017/06/22 12:03] pereira [Pumping analysis-line lower-dipole section] |
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| ====== Venting/ | ====== Venting/ | ||
| - | ==== Venting analysis-line lower-dipole section ==== | + | ===== Venting analysis-line lower-dipole section |
| In order to ensure that the beamline in the target area is properly aligned with respect to the beam axis, it is necessary to install a telescope in between the last two quadrupoles of the analysis line, as well as a "cross hair" plate in between the last quadrupole and the target chamber. Although the alignment of the telescope is done by lab staff (e.g. Dave Sanderson), the user is responsible for removing the gate valve I246GV separating the analysis line and the target area. This of course, requires that the lower-dipole section is properly vented. The venting process is generally done by the device physicist, following the steps: | In order to ensure that the beamline in the target area is properly aligned with respect to the beam axis, it is necessary to install a telescope in between the last two quadrupoles of the analysis line, as well as a "cross hair" plate in between the last quadrupole and the target chamber. Although the alignment of the telescope is done by lab staff (e.g. Dave Sanderson), the user is responsible for removing the gate valve I246GV separating the analysis line and the target area. This of course, requires that the lower-dipole section is properly vented. The venting process is generally done by the device physicist, following the steps: | ||
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| + | ===== Pumping analysis-line lower-dipole section ===== | ||
| + | * Make sure that the manual gate valve is closed (see above). | ||
| + | * Open PanelMate **S800vac** and go to page 04. Make sure that the venting valve **I225VV** is closed (see last step of the [[#Vent focal-plane chamber|venting process]] described above) | ||
| + | * Select window **PUMPDOWN STATUS SECTION 16-LOWER DIPOLES** and click on button **START PUMPDOWN**. The **PUMPDOWN STATUS** and **VENT STATUS** windows should display " | ||
| + | * After the rough valve **I225RV** is automatically open, the mechanical pump will start pumping. | ||
| + | * The pressures in the mechanical pump (from **I224PG**) and beam chamber (from **I226PG**) will jump momentarily to high pressure values. They should go down slowly after few seconds (otherwise, the chamber is not properly closed). | ||
| + | * When pressure in the chamber (from **I226PG**) gets below 100 mTorr (few minuntes), **I225RV** will close. Foreline valve **I225FV** will open followed by the turbo gate valve **I225GV**. | ||
| + | * Wait for few hours until vacuum is good. You can then turn on the ion gauge **I225IG** | ||
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venting_pumping_lower-dipole_section_venting_pumping_lower-dipole_section.txt ยท Last modified: 2023/10/16 08:08 by noji
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