G0 Target Training

This course (~ 2h)

Sit ½ shift with trained tgt operator

Read OSP

Email smithg@jlab.org that you have completed steps 1, 2 & 3

Read How-tos, control system guide, etc.

Tgt must be manned whenever H2 is condensed

Basic Components

6.5 l LH2 cell & re-circulation loop

Re-circulation fan/pump (30 Hz)

500 W (max) heater (on PID) to replace P_beam

500 W (Helium) heat exchanger

He Supply ~ 15K, 15 atm

He Return ~ 19K, 3 atm

JT controller on He Supply

T&P instrumentation

Control System

Gas Panel, Ballast tank, Electronics

Target Installation

In the Hall

Gas Panel

Tgt Electronics in Hall C

Target Specifications

T=19 ± 0.01 K (T_F=13.8K, T_B=22.2K)

P~25 ± 1 psia (10 psig, or 1.7 atm.)

Beam power ~ 275 W @ 40 µA

Reserve power ~ 50 W

Max. power < 500 W

Fan n=30 Hz

2x2 mm² raster

Beam Currents

Beam tuning: drop cell out of beam, £ 40 mA

Moeller runs: drop cell out of beam, £ 2 mA

LH2 runs: raster on, £ 40 mA

MT runs (cold He gas): raster on, £ 20 mA

C runs: raster on, £ 12 mA cold (5 mA warm)

Halo runs: raster on, £ 20 mA (careful!)

COO Duties

Be present whenever H2 is condensed

Insure tgt is safe. Monitor. Report problems to tgt expert

Insure raster is on

Initiate any changes required (motion)

Coordinate motion through MCC

Log changes & alarms in g0log

Essential Responsibilities

At start of your shift:

Verify power settings, configuration, program

Verify alarm handler & logger are functional

Make alh visible in all workspaces

Complete the checklist

Log alarms, configuration changes

Service alarms from lowest level in tree

Contact MCC before & after tgt motion

Know the essential “How-tos”

Your Job (Do’s)

Keep tgt safe & within specs (6.5l LH2!!!)

Monitor! Watch! Listen! Think!

Service & log alarms

Change targets (thru MCC)

Respond to ESR changes with JT

Keep ~50 W reserve heater power for PID

Log configuration changes, etc.

Don’ts

Cooldown

Warmup

Manipulate gas panel

Change alarm setpoints (unless asked to do so by a tgt expert)

Leave tgt console unattended

Fail to acknowledge alarms

Let system go sub-atmospheric or below 14K

Move tgt while beam is on

Experts

Target Operator’s Station

Getting Started

log into gzerol2.acc as g0targ

PW is ____________

cd $G0TGT/bin

Type “medm”, then click “execute” mode

This will launch main GUI, alh, strip charts,

Insure alh visible everywhere, alh & logger running. Heartbeat OK?

Crack secondary GUIs from main GUI

Target Control GUIs

Rebooting the Target IOC

Why? Heartbeat lost, stripcharts flat, etc.

Call MCC for beam off

Set manual HPH I&V for appropriate power

Set HPH controller switches to “manual”

Monitor temps via TV, fine-tune HPH I/V

Main GUI, click: - For Experts – IOC – IOC Save/Restore/Reboot – Reboot. Wait 2min. until heartbeat, green lights, etc. back

IOC Save/Restore - ! – Log a msg - Normal Restore

Rebooting the Target IOC, ctd.

Not OK? Then hardware reboot (target IOC) thru the reboot GUI over at the CODA terminal

Put HPH back on PID:

Main GUI – Heater Control – check set val is ok – PID Enable – Heater Mode PID

PID OK? Then flip manual HPH switches back to “Computer”. Check that PID is “pidding”.

Call MCC for beam back. Log event in g0log.

Hall C Electronics Room

Changing Targets

Call MCC: beam off, mask tgt motion FSD, inform them which tgt you’re going to

From main GUI, click:

Target Position, then choose Target Motion

Enable the chosen target

Enable the sequencer

Click on chosen target

Disable sequencer when it’s there

Fine tune position to ±10 units if necessary (100 units ~ 1mm)

Call MCC: beam & FSD on, new I_b, new tgt

Log configuration change

Alarm Handler

Alarm Handler GUI must be visible in each workspace

If not running, from main GUI click:

Alarm

From Start Alarm Handler click !

Alarm Colors:

Red: major, ouside wide limits

Yellow: minor, outside narrow limits

White: readout error

Alarm Color States:

Steady: alarm condition was transient

Flashing: alarm condition is active

Servicing Alarms

Click on alh bar to open alarm tree GUI

There click on raised button corresponding to the branch that is alarming on screen left

On screen right, click on the P next to the alarming sub-branch. This shows current value and all limits.

If OK, click the colored button left of sub-branch to clear the alarm

If not OK, why? Call an expert?

Log the event

Alarm Handler GUI

Check Logger

From main GUI:

Click the ! Button next to Check Archiver

OR, type ps –e | grep ArchiveEngine on a control computer xterm

OK? Then 3 instances will be listed

Not OK? You get nothing back.

Then, type cd /Archives

Then, type ./start_archiver

Emergency Procedures

Why? ESR crash, power failure, LOV, etc.

Ask for beam off if not already off

Call an expert. May advise controlled access.

If T climbing, put manual HPH control to 0

Fan speed to 10 Hz

Keep close eye on loop pressure, must not go sub-atmospheric. PV12 should stay open except in a LOV

Tgt expert may ask you to do a warmup over the phone (together, & only thru MCC)

Dummy Targets

Adjusting the Heat Load

P_beam~270 W at 40 µA, P_reserve~50-100 W

With beam on, need ~50-100 W on HPH

With beam off should have ~350 W on HPH

(if off a long time, can reduce)

HPH power adjusterd automatically

(in PID looking at T_loop

To adjust, use JT:

Open JT to increase HPH power

Close JT to lower HPH power

Main GUI

Coolant GUI

Heater Control GUI

Target Motion GUI

Pump GUI

Temperatures GUI

Pressures GUI

Stripcharts

Vapor Pressure GUI

Gas Panel GUI

Valves

IOC GUI

Alarms GUI

Slide 42


	This course (~ 2h)
	Sit ½ shift with trained tgt operator
	Read OSP
	Email smithg@jlab.org that you have completed steps 1, 2 & 3
	Read How-tos, control system guide, etc.
	Tgt must be manned whenever H2 is condensed


	6.5 l LH2 cell & re-circulation loop
	Re-circulation fan/pump (30 Hz)
	500 W (max) heater (on PID) to replace P_beam
	500 W (Helium) heat exchanger
		He Supply ~ 15K, 15 atm
		He Return ~ 19K, 3 atm
		JT controller on He Supply
	T&P instrumentation
	Control System
	Gas Panel, Ballast tank, Electronics


	T=19 ± 0.01 K (T_F=13.8K, T_B=22.2K)
	P~25 ± 1 psia (10 psig, or 1.7 atm.)
	Beam power ~ 275 W @ 40 µA
	Reserve power ~ 50 W
	Max. power < 500 W
	Fan n=30 Hz
	2x2 mm² raster


	Beam tuning: drop cell out of beam, £ 40 mA
	Moeller runs: drop cell out of beam, £ 2 mA
	LH2 runs: raster on, £ 40 mA
	MT runs (cold He gas): raster on, £ 20 mA
	C runs: raster on, £ 12 mA cold (5 mA warm)
	Halo runs: raster on, £ 20 mA (careful!)


	Be present whenever H2 is condensed
	Insure tgt is safe. Monitor. Report problems to tgt expert
	Insure raster is on
	Initiate any changes required (motion)
	Coordinate motion through MCC
	Log changes & alarms in g0log


	At start of your shift:
		Verify power settings, configuration, program
		Verify alarm handler & logger are functional
		Make alh visible in all workspaces
		Complete the checklist
	Log alarms, configuration changes
	Service alarms from lowest level in tree
	Contact MCC before & after tgt motion
	Know the essential “How-tos”


	Keep tgt safe & within specs (6.5l LH2!!!)
	Monitor! Watch! Listen! Think!
	Service & log alarms
	Change targets (thru MCC)
	Respond to ESR changes with JT
		Keep ~50 W reserve heater power for PID
	Log configuration changes, etc.


	Cooldown
	Warmup
	Manipulate gas panel
	Change alarm setpoints (unless asked to do so by a tgt expert)
	Leave tgt console unattended
	Fail to acknowledge alarms
	Let system go sub-atmospheric or below 14K
	Move tgt while beam is on


	log into gzerol2.acc as g0targ
		PW is ____________
	cd $G0TGT/bin
	Type “medm”, then click “execute” mode
	This will launch main GUI, alh, strip charts,
	Insure alh visible everywhere, alh & logger running. Heartbeat OK?
	Crack secondary GUIs from main GUI


	Why? Heartbeat lost, stripcharts flat, etc.
	Call MCC for beam off
	Set manual HPH I&V for appropriate power
	Set HPH controller switches to “manual”
	Monitor temps via TV, fine-tune HPH I/V
	Main GUI, click: - For Experts – IOC – IOC Save/Restore/Reboot – Reboot. Wait 2min. until heartbeat, green lights, etc. back
	IOC Save/Restore - ! – Log a msg - Normal Restore


	Not OK? Then hardware reboot (target IOC) thru the reboot GUI over at the CODA terminal
	Put HPH back on PID:
		Main GUI – Heater Control – check set val is ok – PID Enable – Heater Mode PID
	PID OK? Then flip manual HPH switches back to “Computer”. Check that PID is “pidding”.
	Call MCC for beam back. Log event in g0log.


	Call MCC: beam off, mask tgt motion FSD, inform them which tgt you’re going to
	From main GUI, click:
		Target Position, then choose Target Motion
		Enable the chosen target
		Enable the sequencer
		Click on chosen target
		Disable sequencer when it’s there
		Fine tune position to ±10 units if necessary (100 units ~ 1mm)
	Call MCC: beam & FSD on, new I_b, new tgt
	Log configuration change


	Alarm Handler GUI must be visible in each workspace
	If not running, from main GUI click:
		Alarm
		From Start Alarm Handler click !
	Alarm Colors:
		Red: major, ouside wide limits
		Yellow: minor, outside narrow limits
		White: readout error
	Alarm Color States:
		Steady: alarm condition was transient
		Flashing: alarm condition is active


	Click on alh bar to open alarm tree GUI
	There click on raised button corresponding to the branch that is alarming on screen left
	On screen right, click on the P next to the alarming sub-branch. This shows current value and all limits.
	If OK, click the colored button left of sub-branch to clear the alarm
	If not OK, why? Call an expert?
	Log the event


From main GUI:
	Click the ! Button next to Check Archiver
	OR, type ps –e \| grep ArchiveEngine on a control computer xterm
		OK? Then 3 instances will be listed
		Not OK? You get nothing back.
			Then, type cd /Archives
			Then, type ./start_archiver



	Why? ESR crash, power failure, LOV, etc.
	Ask for beam off if not already off
	Call an expert. May advise controlled access.
	If T climbing, put manual HPH control to 0
	Fan speed to 10 Hz
	Keep close eye on loop pressure, must not go sub-atmospheric. PV12 should stay open except in a LOV
	Tgt expert may ask you to do a warmup over the phone (together, & only thru MCC)


	P_beam~270 W at 40 µA, P_reserve~50-100 W
	With beam on, need ~50-100 W on HPH
	With beam off should have ~350 W on HPH
		(if off a long time, can reduce)
	HPH power adjusterd automatically
		(in PID looking at T_loop
	To adjust, use JT:
		Open JT to increase HPH power
		Close JT to lower HPH power