Procedure for Installation and Adjustment of the Limit Switch Actuators (LSA) on the LCLS Undulator Support and Motion System Translation Stages (SMS-TS).

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ANL
-
LCLS
-
UM_2008
-
002

11/25/2013

E. Trakhtenberg/M.
White

Procedure for Installation and Adjustment of the Limit Switch
Actuators
(LSA)
on the LCLS Undulator Support and Motion System
Translation Stages

(SMS
-
TS)
.


WBS 1.4.3.4.3



ANL
-
LCLS
-
UM_2008
-
002_LimitSwitchActuator
Setting
Procedure.doc


June

0
5
, 2008


Rev 000


Purpose


This procedure describes the steps necessary to successfully install
and adjust the LSA on
the LCLS Undulator SMS
-
TS.


Scope


This procedure covers installation of the two LSA on each of the two translation slides on
each girder, with or withou
t an actual undulator in place.


The procedure does not cover any other aspects of girder assembly or alignment.


It is assumed that a complete job hazard analysis has been performed at SLAC for the
area in which this installation will take place. It is
assumed that all personnel engaged in
this activity are appropriately trained and that they are equipped with all appropriate PPE
as required to safely perform these tasks at SLAC.


Applicability


The procedure applies during installation and adjustment of

the LSA on the LCLS
Undulator SMS
-
TS in the LCLS
undulator tunnel or elsewhere


References


None.


Type of Procedure


This is a technical procedure.


Hazard Controls


Electricity be used to power the motors that move the SMS
-
TS.
It is possible for pinch

hazards to

exist as a result of moving components
; proper
attention must be paid to
ensure safety of all human appendages
.
People should stand back while the motors are
actually driving the stages.



ANL
-
LCLS
-
UM_2008
-
002

11/25/2013

E. Trakhtenberg/M.
White


Training Requirements


Personnel must be appropriately t
rained, per SLAC standards, for these tasks. This
includes but is not limited to: general training for the work area, electrical training, PPE
training to ensure that the required PPE is worn and/or used correctly, and any other
training required at SLAC m
ust be successfully completed before undertaking any part of
this job.


Required Equipment


All Personal Protection Equipment such as safety glasses, safety shoes, gloves etc.,
mechanical and test equipment, equipment manuals etc., are to be specified
by SLAC
after the site
-
specific job hazard analysis is complete.


All equipment is required to be visually inspected for damage, defects, and calibration
labels prior to initial use.


All hoisting and rigging equipment inspections should be current.


Pro
cedure


Orientation
:


Assume persons are standing in the main aisle, looking directly at the undulator. They
will be viewing the titanium strongback,
covered by its

mu
-
metal
magnetic
shield
s
. The
undulator gap is on the opposite side of the undulator from

where the persons are
standing
, with the gap opening facing the tunnel wall
.


Figure

1 is a schematic view of the girder, showing the

translation s
lide and limit switch
locations
.

The beam direction is indicated by a line at the center of the girder poin
ting
from right to left.

T
he “in” direction is
defined
when the undulator moves toward the
vacuum chamber and toward the tunnel wall. “Out” is when the undulator moves away
from the vacuum chamber and away from the tunnel wall, toward the center of the
un
dulator tunnel. “Upstream” and “downstream” are defined with respect to the beam
direction.


Limit switch actuator adjustment will likely be done by persons standing in the aisle, so
that upstream is to their right and downstream to their left, else it wil
l be extremely
difficult to work around the vacuum chamber support.


T
he
two
upstream limit switches on both stages
were

initially
adjusted to have a nominal
travel of
83

mm
;

the two downstream

limit switches

were

initially adjusted to have a
nominal trave
l of 86

mm.



ANL
-
LCLS
-
UM_2008
-
002

11/25/2013

E. Trakhtenberg/M.
White

Beam
Direction
IN
OUT
Girder
Downstream
Translation
Slide
Upstream
Translation
Slide
Direction of
Undulator
Travel
Downstream Limit Switch
Upstream Limit Switch
Long
-
travel Potentiometer
Beam
Direction
IN
OUT
Girder
Downstream
Translation
Slide
Upstream
Translation
Slide
Direction of
Undulator
Travel
Downstream Limit Switch
Upstream Limit Switch
Long
-
travel Potentiometer

Figure
1
:
This s
chematic view show
s

translation slide and limit switch locations on a
girder.

The
“in”
direction is when the undulator moves
toward the vacuum
chamber

and toward the tunnel wall. “O
ut”

is when the undu
lator moves away
from the vacuum chamber and away from the tunnel wall, toward the center of the
undulator tunnel. “Upstream” and “downstream” are defined with respect to the
beam direction.



Figure
2
: Photograph of an undulato
r on its support and motion
system

in
the

LTT
at Argonne.

The photo was taken from the aisle side, the same side that a worker
would be performing the work detailed in this procedure.







ANL
-
LCLS
-
UM_2008
-
002

11/25/2013

E. Trakhtenberg/M.
White

Directions:




Step 1:
Adjustment
of

upstream side of the upstream t
ranslation stage
.


1.

Loosen the set screw that holds the brass pusher
-
block in position, and push the brass
pusher block all the way
to its most compressed position, or in other words, b
ring the
“in” pusher to the complete “
out
” position.


2.

Place

the
undulato
r
template (
or
undulator) in the desired position


5.5 mm in from
the nominal one.

3.

G
ently
move the
brass pusher ski
in until you feel
or hear the limit
switch click
. I
f
you
are
us
ing

the special
electronic switch
-
setting box, move it

until
the
correspondi
ng
LED

comes
on
. Tighten the set screw, holding the pusher so it does not
move.

4.

Move the template (
or
undulator)
out

by 3 mm and
then move it in until the

limit
switch
clicks
or
the corresponding LED

turns

on.

5.

Check the actual the template (
or
undulator)
position and correspondingly adjust the
pusher, measuring the distance between pusher heads with a caliper.

6.

Repeat step 5 until
the error is

less than 60 microns.
Experience in the LTT at ANL
indicates that the position can be adjusted to within 50
-
60 micr
ons in 2 to 3 iterations.

7.

Before, during, and after all motions, verify that there is
clearance between
the
vacuum
chamber and the template (
or
undulator) oute
r surface using a set of the
fee
ler gauges.

8.

Use the same procedure to adjust the

“o
ut

pusher af
ter

bring
ing

the template (
or
undulator)
to

its

desired position


85.5 mm
out

from nominal.

9.

Before, during, and after all motions, verify that there is

clearance between
the
translation stage table and its body plate
using a

set of
feeler

gauges.




Step 2
:
Adjustment procedure for the downstream

side

of the up
stream
translation stage
.



1.

Remove
the
long travel potentiometer and its
aluminum
holdi
ng block to allow for
clear access

to the stage
.

2.

Bring the “in” pusher to the complete “
out
” position.

3.

Bring the
template (
or
undulator) to

the desired position


6.5 mm in from the
nominal one.

4.

Repeat
#
4 t
hrough

#
7 from
Step 1

above.


8.

Adjust

the


out
” pusher exactly the same way; only bring the template (
or
undulator)
to

the desired position


86.5 mm
out

from the n
ominal one.

9.

Before, during, and after all motions, verify that there is
clearance between

the

translation stage table and its body plate
using a set of feeler gauges
.




Step 3:
Adjustment
procedure for the upstream

side

of the down
stream translation
stage
.


1.

Remove the long travel potentiometer and its aluminum holding block to allow for
clear access

to the stage
.




ANL
-
LCLS
-
UM_2008
-
002

11/25/2013

E. Trakhtenberg/M.
White

2.

Bring the “in” pusher to the complete “
out
” position.


3.

Bring the template (
or
undulator)
to

the desired position


5.5 mm in from the
nominal one
.


4.

Repeat
#
3 to
#
9 from
Step

1

above
.

5.

Before, during, and after all motions, verify that there is clearance between the
translation stage table and its body plate using a set of feeler gauges.




Step 4:
Adjustment
of

downstream side of the down
stream transl
ation stage
.


1.

Bring the “in” pusher to the complete “
out
” position.

2.

Bring the template (
or
undulator)
to

the desired position


6.5 mm in from the nominal
one.

3.

Repeat
#
4 to
#
7 from
Step 1

above
.

4.

Adjust
the

out
” pusher
in
exactly the same way;
only bring the template (
or
undulator)
in the desired position


86.5 mm
out

from nominal.

5.

Before, during, and after all motions, verify that there is clearance between the translation
stage table and its body plate using a set of feeler gauges.


Docume
ntation and Records Requirements



These activities should be documented by recording them in a logbook.


Attachments


There are no attachments.



Created by
:


__Emil Trakhtenberg______________________________

_____________________

ANL LCLS Responsible Eng
ineer





Date


Approved by:


__Marion M. White________________________________

_____________________

Name, Title, Organization
-
Group





Date



__Marion M. White_______________________________

_____________________

LCLS Technical Lead







Date


__James

W. Lang ________________________________

_____________________

ANL APS ESH Coordinator






Date


__________________________________________________

_____________________

LCLS Cost Account Manager






Date



ANL
-
LCLS
-
UM_2008
-
002

11/25/2013

E. Trakhtenberg/M.
White


__Tom Barsz____________________________________
________

_____________________

*ANL LCLS QA Coordinator






Date


*Upon approval, the LCLS QA Coordinator will return a copy of the approved procedure
to the procedure creator and keep the original for entry into the LCLS records archive.
The LCLS QA Coo
rdinator will also enter the procedure into the LCLS Records database
then place a copy of the procedure on the LCLS Web page.