Difference between revisions of "The HPS Run Wiki"
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== Run Plan:March 18-19 (swing/owl/day) == | == Run Plan:March 18-19 (swing/owl/day) == | ||
− | + | Overview: Close up Hall B during swing, sweep, and go to beam permit. Beams are expected during owl. | |
+ | Program then will be to (1) restore beams to tagger; (2)starting Mar 19 day, make upstream beams available to machine | ||
+ | for BPM calibration;(3)take beams to Hall B dump; (4)make downstream beams available to machine for BPM calibration. | ||
'''<font size=3> Always Setup Beam to the Hall-B Tagger Dump after long down </font>''' | '''<font size=3> Always Setup Beam to the Hall-B Tagger Dump after long down </font>''' | ||
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* Perform harp scans to verify that beam profile did not changed, check with previous scan results: 2C21 x/y widths <50 micron, on the tagger/2C24 harp x/y widths ~300 micron. Use UPS-L for analysis, send harp scan results to the logbook | * Perform harp scans to verify that beam profile did not changed, check with previous scan results: 2C21 x/y widths <50 micron, on the tagger/2C24 harp x/y widths ~300 micron. Use UPS-L for analysis, send harp scan results to the logbook | ||
− | * After beam tune is done send HPS scaler GUI to the logbook with proper comment | + | * After beam tune is done send HPS scaler GUI to the logbook with proper comment |
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+ | '''<font size=3> Give Beams to Machine in day shift for BPM calibration of upstream beamline. </font>''' | ||
'''<font size=3> Setup Beam to the Hall-B Faraday cup Dump and Setup HPS. </font>''' | '''<font size=3> Setup Beam to the Hall-B Faraday cup Dump and Setup HPS. </font>''' | ||
− | * Ask MCC to turn OFF the beam, turn OFF and | + | * Ask MCC to turn OFF the beam, turn OFF and degauss tagger magnet |
* After tagger magnet is degaussed, change beam configuration on "bta" GUI to "Electron" | * After tagger magnet is degaussed, change beam configuration on "bta" GUI to "Electron" | ||
* Insert Chromax screen on the downstream viewer on the beam | * Insert Chromax screen on the downstream viewer on the beam | ||
− | * | + | * With <10 nA beam, make sure beam is centered on the downstream viewer |
− | <b> Beam should be centered using correctors on 2C21, 2C23, and 2C24 girder. | + | <b> Beam should be centered using correctors on 2C21, 2C23, and 2C24 girder. Correctors at 2H02 have been disabled.</b> |
− | * Ask for ~10 nA CW beam, watch cctv6 to make sure spot on the downstream viewer is clear and | + | * Ask for ~10 nA CW beam, watch cctv6 to make sure spot on the downstream viewer is clear and approximately at the center of the screen |
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* If everything looks normal, rates on downstream counters are <10Hz, and on HPS-L and HPS-R are <30Hz at 10nA, send main HPS scaler GUI to the logbook and proceed | * If everything looks normal, rates on downstream counters are <10Hz, and on HPS-L and HPS-R are <30Hz at 10nA, send main HPS scaler GUI to the logbook and proceed | ||
− | + | * Use 2H02A harp to measure beam profile (beam current should not exceed 20 nA), beam size should be X-width ~250 um Y-width < 50 um. Beam should be within ~1mm of December harp scan values. | |
− | * Use 2H02A harp to | + | * Turn beam off. Insert SVT Protection Collimator 4mm slit to its nominal position. Vertically scan the collimator, measuring the halo counter rates vs vertical position. Beam should be within ~1mm of center. |
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+ | '''<font size=3> Give beams to machine for BPM calibration of downstream beamline. </font>''' | ||
+ | |||
+ | '''<font size=3. Energize chicane.,</font>''' | ||
* Energize HPS chicane - ask MCC to turn beam OFF, ramp up magnets to desired currents according to procedures (use the table). | * Energize HPS chicane - ask MCC to turn beam OFF, ramp up magnets to desired currents according to procedures (use the table). | ||
* After magnets are at required settings (will take ~40 min) ask MCC for 10 nA beam | * After magnets are at required settings (will take ~40 min) ask MCC for 10 nA beam | ||
− | * Observe beam spot on chromox viewer, beam spot should be at the same place as before magnets were turned ON. If spot is shifted, change Frascati magnets curent to correct the | + | * Observe beam spot on chromox viewer, beam spot should be at the same place as before magnets were turned ON. If spot is shifted, change Frascati magnets curent to correct the position - if beam is left of the original point current must be lowered, if it is shifted right current must be increased. Do current change with small steps, ~1 Amp |
* After chicane is set, record halo counter rates, turn beam off and insert HPS target, 4um W | * After chicane is set, record halo counter rates, turn beam off and insert HPS target, 4um W | ||
− | * Using table provided change chicane settings to move beam left and right on the target with ~1mm step. First move | + | * Using table provided change chicane settings to move beam left and right on the target with ~1mm step. First move right, stop when rates on halo counters will increase by several times, then move left until rates will start to go up. Turn beam off every time currents are changed. |
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Revision as of 15:59, 18 March 2015
Important Phone NumbersShift ScheduleChecklists |
Procedures |
Manuals |
JLab Logbooks
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RC: John Jaros
PDL: Harut AvagyanEvery Shift:
SVT InstructionsBefore sending beam to Faraday cup, verify (and page expert if otherwise):
The first time sending beam to the Faraday cup after the hall is closed, page the SVT expert. Every Run:
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Run Plan:March 18-19 (swing/owl/day)Overview: Close up Hall B during swing, sweep, and go to beam permit. Beams are expected during owl. Program then will be to (1) restore beams to tagger; (2)starting Mar 19 day, make upstream beams available to machine for BPM calibration;(3)take beams to Hall B dump; (4)make downstream beams available to machine for BPM calibration. Always Setup Beam to the Hall-B Tagger Dump after long down
Upstream halo counters must count <10Hz, downstream counters ~Hz
Give Beams to Machine in day shift for BPM calibration of upstream beamline. Setup Beam to the Hall-B Faraday cup Dump and Setup HPS.
Beam should be centered using correctors on 2C21, 2C23, and 2C24 girder. Correctors at 2H02 have been disabled.
Give beams to machine for BPM calibration of downstream beamline. <font size=3. Energize chicane.,
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Webcams:
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Slow Controls: |
Accelerator:
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Offline: |