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venting_pumping_lower-dipole_section_venting_pumping_lower-dipole_section [2017/06/22 12:03] pereira [Pumping analysis-line lower-dipole section] |
venting_pumping_lower-dipole_section_venting_pumping_lower-dipole_section [2023/10/16 08:08] (current) noji [Venting analysis-line lower-dipole section] |
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- | ====== Venting/ | + | ====== Venting/ |
- | ===== 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 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 | + | |
- | - Verify that the target area is vented. | + | The venting |
- | - Using the EMIS controllers in the middle level of the S3 vault (see figure above), ensure that the ion gauge I225IG | + | |
- | - Ensure that gate valves I246GV (between lower-dipole section and target area) and I215GV (between intermediate image area and the lower-dipole section) are closed. | + | |
- | - Open **S800vac** PanelMate. | + | |
- | - Go to page 4 (" | + | |
- | - Window "VENT STATUS" | + | |
- | - Click on "VENT STATUS" | + | |
- | - Walk to the bottom level of the S3 vault, right downstream of the last two dipoles of the analysis line. Locate the I226PG Pirani gauge and ensure that it reads rough-vacuum pressure | + | |
- | - Slowly open the manual valve (see picture below) and verify that the pressure read in I226PG raises slowly. | + | |
- | - After the section | + | |
+ | {{: | ||
- | {{: | + | Instructions on how to vent/pump-down this section are described below. |
+ | ===== Venting analysis-line lower-dipole section ===== | ||
- | {{:wiki:manualvalve-lowerdipoles.jpg? | + | - Notify the Control Room that EXP alarms may occur. |
+ | - Ensure that beamline gate valves D2436 BGV (between intermediate image area and the lower-dipole section) and D2542 BGV (between lower-dipole section and target area) are closed. | ||
+ | - Ensure that the ion gauge RBT_BTS33:IG_D2478 is turned off. | ||
+ | - Check the box next to “Show Valve Controls”, | ||
+ | | ||
+ | - Ensure that the beam chamber is isolated and double-check the ion gauge is off, and open the vent valve (RBT_BTS33: | ||
+ | | ||
- | ===== Pumping analysis-line lower-dipole section ===== | + | ===== Pumping-down 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** | + | |
+ | - The beamline gate valves D2436 BGV and D2542 BGV, the vent valve, the turbo gate valve, and the roughing valve (RV) should be all closed. The foreline valve (FV) should remain open. The ion gauge should remain turned off. The vacuum status should be red with "BAD VACUUM" | ||
+ | - Close FV and then open RV to start pumping down the beam chamber with the roughing pump. You can monitor the BPG reading (RBT_BTS33: | ||
+ | - As the pressure goes down, the vacuum status should become yellow with "POOR VACUUM" | ||
+ | - Close RV and open FV, turn TMP on. | ||
+ | - Wait until TMP reaches at normal rotation and open TGV, and the vacuum status should become green with "GOOD VACUUM" | ||
+ | - Wait until pressure goes below 1 mTorr, and then turn on the ion gauge RBT_BTS33: | ||