Difference between revisions of "The HPS Run Wiki"

Revision as of 13:52, 20 April 2015

Procedures

Commissioning Plans:
- Beamline
- Beam Trips
- Trigger (old)
- ECal
- SVT
SVT TOSP (1,2,3)
Tunnel/Hall Access
Power Failure

Manuals

Harp Scans
Beam Trip Runs
SVT
ECal (Annex)
DAQ
Beamline
- Turning Chicane ON/OFF
- Chicane Settings
Slow Controls

JLab Logbooks

RC: Maurik Holtrop

(757) 575-7540
9 575 7540 from Counting Room

PDL: Stepan Stepanyan

Every Shift:

Follow run plan as outlined by RC

Once BPMs are calibrated, ask MCC if orbit locks are on, they should be.

Keep shift summary up-to-date in HBLOG. Record all that happens.
Update the run table on Google Docs.

Document any beam condition change and send scaler GUIs to HBLOG

Send "scaler_hps" GUI to logbook at least twice per shift or at any time run conditions change

Peform 2H02A harp scan once per shift or when beam conditions have changed, based on beam monitors (BPMs, halo rates, beam-viewer)

Fill out shift checklist in the logbook, HBLOG, using template at least ones per shift or when run conditions change

Continuously check quality of data

With any issue contact On-Call Experts or RC.

SVT Instructions

Before sending beam to Faraday cup, verify (and page SVT expert if otherwise):

SVT should be open: "Position" at 0.000 mm in scaler GUI
SVT HV is off: all red/green indicators RED in SVT bias GUI

The first time sending beam to the Faraday cup after the hall is closed, page the SVT expert.

Acceptable Beam Conditions:

Before accepting beam, make sure all the conditions are met - beam profile and halo rates are what you expect (or very close to it). If unsure call to RC, PDL, or beamline expert!

Beam optics setting is such that at 2H02A harp the beam profile will be as requested by HPS,wide in X-direction and narrow in Y.
This optics setting will make the beam profile at 2C21 harp narrow in both directions, while profile on the "tagger" or 2C24 harp wide in both directions.
The halo counter rates before HPS must be low:
- UPS-L and UPS-R few Hz/nA,
- if tagger magnet is energized TAG-L/T/T2 ~10Hz/nA [1],
- if beam is going to Faraday cup dump then tagger counters and downstream counters should count <<1 Hz/nA
The halo counter rates on HPS, HPS-L/R/T/SC, depends on the collimator and HPS chicane settings, but should not be more than 100 Hz/nA[2]
As halo counters, positions on BPMs and the settings of correctors also must be close to what where before.

Always read previous log entries, compare settings of BPMs and correctors with previous settings using scaler_hps GUI.

Every Run:

a
b
c
d

MCC Daily Meetings

Run Plan: April 17-22, 2015 (day/swing/owl)

During week days, Mon-Thursday, there will be no Day shifts due to work in the hall. Friday day shift may happen (slim probability), so be prepared. Monday Swing shift will recover after significant amounts of accelerator work, so a full tune up of the Hall-B beamline will be required.

Short Term Schedule: Study Trigger and SVT running conditions.

We will be running with 1.05GeV beam. This beam needs to be carefully restored, first to the tagger dump, then the alcove and Faraday cup screen. Before sending beam to the alcove, call the RC.

MCC re-tunes upstream beam into the tagger dump. See acceptable beam documentation before moving on;
When beams are acceptable, MCC restores beams to alcove; This requires a degauss of the tagger magnet (takes a while!)
1. Notify RC.
2. SVT must be open, collimator must be in.
BPMs were "rough" calibrated. Check old settings, but remember there is likely still a current dependence on the stripline BPMs.
Require good spot on Chromax, low counts on halo counters, have MCC turn on orbit locks if current is stable and above 15 nA, and then set-up chicane.
1. Note: If you change beam current current, turn orbit locks off first, there is a current - position dependence on the stripline BPMs 2H00 and 2H02.
Make sure the beam is well centered in Y and goes through the center of the HPS collimator.
Call SVT expert. Expert will check conditions and turn on SVT.
Take data with SVT open and check the SVT timing.
Take data. Subsystem commissioning studies: more trigger commissioning studies, beam trip studies once orbit locks are on.
Check if tracking works!

When we're back, proceed with program

Document all your work in the logbook! Please!

MCC works on beam optics and matching, and tunes beam to tagger

After MCC finishes beam tune and upstream bpms are calibrated
- record harp scans at 2C21 and 2C24. These must be good scans, good S/N, no tails, and low halo count rates before proceeding.

Standards are on this page: ACCEPTABLE BEAM CONDITIONS.

- make sure no bleedthrough-- counts when no beam?
- After beam tune is done send HPS scaler GUI to the logbook with comments

Restore Beam to the Hall-B Dump

Ask MCC to turn OFF the beam.
Turn off tagger magnet and change beam configuration to "bta" GUI to "Electron"
Have MCC degauss magnet
Make sure target is out
Insert Chromax screen on the downstream viewer
4mm SVT Protection collimator in place
Restore 1 nA CW beam and have MCC bring beam to y~-5mm; x~5mm on the Chromax screen. (distance between dots=5mm). Record spot. Record scalers. Repeat and record 2C21 and 2C24 harp scans and corrector settings. We need these for next time!
Record position at 2H02 harp. Repeat at 10 nA. Must have good spots, nominal sizes, no tail to proceed. Position ok?
record scalers and beam location on screen.
establish orbit locks

Energize Chicane

follow standard procedures in Beamline manuals for procedures and settings. Use table for 1 GeV beam!
beam spot on Chromax should be unmoved. If not, tune Frascati slightly. See caution below.

Be very careful when changing magnet currents when beams are on. Must enter new current ACCURATELY. Small steps (few amps) only.

Turn beam off and insert HPS target, 4um W. Restore beam. Check count rates.
Do horizontal scan of beam on target. Using table provided, first change Frascati settings, then PS settings to move beam left and right on the target with ~1mm step. Small changes only. Return to nominal beam position.
Do vertical scan of target at nominal beam position. Measure halo counter/ecal rates vs target position. Record data and graph.

Are we centered? Beamline Expert should enter new target positions if not.

Do scan of SVT collimator, measuring counter rates vs SVT collimator position with nominal beam position.
If Omar and beamline expert are available during day or swing, do SVT Wire Scan. This still needs an expert. Orbit locks must be temporarily removed to move beam horizontally with upstream correctors, if needed. Restore orbit locks when done.

Subsystem Commissioning Studies. Begin Data Taking.

DO NOT RUN MORE THAN 30 MINUTES ABOVE 50 nA WITHOUT THE BEAM BLOCKER
PUT BEAM BLOCKER IN FOR LONG RUNNING AT HIGH CURRENT

Make sure DAQ is OK for data taking
More Trigger commissioning data runs. See Valery's note on the run Wiki under commissioning trigger.
If orbit locks are on, call Rafayel for beam trip study. Take 4 hours of beam trip data with wire up; take 4 hours of beam trip data with wire down.
Absent other requests, take data at 50 nA. Be sure to block Faraday cup if higher current.

Beam
Energy	~2.0 GeV
Current	< 200.0 nA CW
Position
X	Y
~0 mm	~0 mm
Profile
X	Y
< 0.1 mm	< 0.1 mm

Target
#1	0 mm

Magnets
PS Current	0 A
Chicane Dipole #1	0 A
Chicane Dipole #2	0 A

DAQ
Configuration	___________________
Configuration file
Prescales
Thresholds
Events Per Run
Dead Time

Trigger
FADC		GTP
NSB/NSA	20/100 ns	Samples Before/After	3/3
Readout Threshold	12 ADC	Seed Threshold	80 MeV
SSP
		Singles-0	Singles-1
# Hits		>2	>2
Cluster Energy		0.1 < E < 2.5 GeV	0.5 < E < 1.2 GeV
		Pairs-0	Pairs-1
Cluster Energy		0.09 < E < 1.3 GeV	0.1 < E < 0.6 GeV
Energy Sum		0.19 GeV < E < 2.2 GeV	0.21 < E < 1.0 GeV
Energy Difference		dE < 1.2 GeV	dE < 0.65 GeV
Coplanarity		N/A	Theta < 40 deg
Energy Slope		N/A	> 0.6 GeV
TI Prescales
Singles-0	Singles-1	Pairs-0	Pairs-1
0	0	0	0

@@ Line 144: / Line 144: @@
 == Run Plan: April 17-22, 2015 (day/swing/owl) ==
-April 17 Swing and Saturday April 18 Owl are cancelled. Saturday April 18 Day shift should count on coming in.
+During week days, Mon-Thursday, there will be no Day shifts due to work in the hall. Friday day shift may happen  (slim probability), so be prepared.
-During week days, Mon-Thursday, there will be no Day shifts due to work in the hall. Friday day shift may happen, so be prepared.
+Monday Swing shift will recover after significant amounts of accelerator work, so a full tune up of the Hall-B beamline will be required.
-'''<font size=3>Short Term Schedule: Restore Beam</font>'''
+'''<font size=3>Short Term Schedule: Study Trigger and SVT running conditions.</font>'''
-We will be running with 1.05GeV beam. This beam needs to be carefully restored, first to the faraday cup, then the alcove. Before sending beam to the alcove, call the RC.
+We will be running with 1.05GeV beam. This beam needs to be carefully restored, first to the tagger dump, then the alcove and Faraday cup screen. Before sending beam to the alcove, call the RC.
 # MCC re-tunes upstream beam into the tagger dump. See acceptable beam documentation before moving on;
-# When beams are acceptable, MCC restores beams to alcove;
+# When beams are acceptable, MCC restores beams to alcove; This requires a degauss of the tagger magnet (takes a while!)
-## Notify RC or SVT expert. We want someone at MCC to monitor progress.
+## Notify RC.
 ## SVT must be open, collimator must be in.
-# When decent beams have been reestablished, calibrate downstream strip-line BPMS:
+# BPMs were "rough" calibrated. Check old settings, but remember there is likely still a current dependence on the stripline BPMs.
-## With orbit locks off, ask MCC to slowly ramp up the current of the beam (5 - 60 nA). Look on the strip charts for a correlation between current and beam position.
+# Require good spot on Chromax, <b>low counts on halo counters</b>, have MCC turn on orbit locks if current is stable and above 15 nA, and then set-up chicane.
-## Make a log book entry of the results. The data can be analyzed later from the archives, but we want to know if there is a region where we can run with orbit locks on, or if orbit locks can only be used for a fixed current.
+## Note: '''If you change beam current current, turn orbit locks off first''', there is a current - position dependence on the stripline BPMs 2H00 and 2H02.
-# Post calibration, require good spot on Chromax, low counts on halo counters, have MCC turn on orbit locks if current is stable, and then set-up chicane.
+# Make sure the beam is well centered in Y and goes through the center of the HPS collimator.
-## Note: '''If you change current, turn orbit locks off first'''
+# Call SVT expert. Expert will check conditions and turn on SVT.
-# Scan target vertically and horizontally, measure halo rates vs target;
+# Take data with SVT open and check the SVT timing.
-# Call SVT expert. Expert will turn on SVT.
+# Take data. Subsystem commissioning studies: more trigger commissioning studies, beam trip studies once orbit locks are on.
-# Take data with SVT open and do SVT timing in.
+# Check if tracking works!
-# Take data. Subsystem commissioning studies: more trigger commissioning studies, beam trip studies once orbit locks are on.
 '''<font size=3> When we're back, proceed with program </font>'''
+# <font color=red>'''Document all your work in the logbook!''' Please! <font>
 '''<font size=3> MCC works on beam optics and matching, and tunes beam to tagger </font>'''
@@ Line 188: / Line 189: @@
 '''<font size=3> Energize Chicane </font>'''
-* follow standard procedures in Beamline manuals for procedures and settings.
+* follow standard procedures in Beamline manuals for procedures and settings. Use table for 1 GeV beam!
 * beam spot on Chromax should be unmoved. If not, tune Frascati slightly. See caution below.

Difference between revisions of "The HPS Run Wiki"

Revision as of 13:52, 20 April 2015

Important Phone Numbers

Shift Schedule

Shift-Taker's Checklist (old)

Hot Checkout

Beam Time Accounting

HPS Run Spreadsheet