13.02.2008mpp meeting sandor feher inner triplet powering should include the ir quads and the dfbx...

13.02.2008 MPP Meeting Sandor Feher

Inner Triplet Powering

Should include the IR quads and the DFBX especially the power leads.

DFBX commissioning doc was completed long time ago.

IT Powering document is ready for review; practically follows the same logic as all of the other circuits.

Picked to discuss issues relevant to HWC:

• Polarity of the Triplet

• Expected QPS (MPP) signals

• Firing Heaters due to Interlock (covered by H. Thiesen)


KEK supplied

CERN supplied

MQXA MQXB MQXB MQXA

MCBXA

MQSX

MCBX

MCBX

BPM

BPM

LMQXC LMQXB LMQXA

LQXC LQXB LQXA

To IP

“Q3” “Q2” “Q1”

C/

W

TAS

pipes pipespipespipes*

beam tube

beam tube

beam tube

beam tube

FNAL supplied

IK 1IK 3 IK 2IK 4

MCSOX

Inner TripletAs a unit it has never been tested => famous pressure test “failure”

Individually cold tested all the magnets however interconnects are done at CERN concern should be with:

• Cryogenics – new control for the Power leads – 600A leads require flow rate control

• Powering – Coupled PC


MQXB Quadrupoles

Coil inner diameter 70 mm Magnetic length 5.5 m Operating temperature 1.9 K Nominal gradient 215 T/m Nominal current 11950 A Cold bore diameter OD/ID 66.5/62.9 mm Peak field in coil 7.7 T Quench field 9.2 T Stored energy 1360 kJ Inductance 19.1 mH

Quench protection Quench heaters, two independent circuits

Cable width, cable 1/2 15.4/15.4 mm Mid-thickness, cable 1/2 1.456/1.146 mm Keystone angle, cable 1/2 1.079/0.707 deg. No of strands, cable 1/2 37/46 Strand dia., cable 1/2 0.808/0.650 mm Cu/SC Ratio, cable 1/2 1.3/1.8 Filament dia., cable 1/2 6/6 m jc, cable 1/2 (4.2 K and 5 T) 2750/2750 A/mm2 Mass 5700 kg


MQXB Quadrupoles

Data collected in 2005


MQXA QuadrupolesCoil inner diameter 70 mm Magnetic length 6.37 m Operating temperature 1.9 K Nominal gradient 215 T/m Nominal current 7149 A Cold bore diameter OD/ID 66.5/62.9 mm Peak field in coil 8.6 T Quench field 10.7 T Stored energy 2300 kJ Inductance 90.1 mH

Quench protection Quench heaters, two independent circuits

Cable width, cable 1/2 11/11 mm Mid-thickness, cable 1/2 1.487/1.340 mm Keystone angle, cable 1/2 2.309/1.319 deg. No of strands, cable 1/2 27/30 Strand dia., cable 1/2 0.815/0.735 mm Cu/SC Ratio, cable 1/2 1.2/1.9 Filament dia., cable 1/2 10/10 m jc, cable1/2, (4.2 K and 6 T) 2200/2160 A/mm2 Mass 9600 kg


MQXA Quadrupoles

5000

6000

7000

8000

QuenchNo Quench

Que

nch

Cur

rent

(A)

MQXA-1 2 3 5 4

215 T/m

230 T/m

Quench Sequence

2b

Thermal cycle

Thermal cycle

7 106 9 8 111st T.C.

1912 13

Thermal cycle

14 15112nd T.C.

16

Bore modification

17 18

0.0

2.0

4.0

6.0

8.0

10

12

14

#1 #2 #3 #5 #4 #2b

#7 #6 #9 #8 #10

#11(

1st)

#12

#13

#14

#11

#15

#16

#17

#18

#19

Straight-SectionLead-EndReturn-End

Num

ber

of Q

uenc

h T

rain

ing

Magnet Number


IR layout & polarities

F/D/F D/F/D

F/D/F

D/F/D

D/F/D

F/D/F

D/F/D F/D/FQ3/Q2/Q1 Q1/Q2/Q3

Polarity of 2&8

and 1&5 are the same


Left LD3 LD1 LD2 LD4

Right LD1 LD3 LD4 LD2

Reiner LD1 LD2 LD3 LD4

+-

++--

This configuration polarity is valid for 1&5 and it is reversed for 2&8

DFBX

DFBX lead label number is increasing from the IP

IP 1234(56)


QPS circuits

RQX

RTQX

Nice summary document for basic info useful for powering written by A. Erokhin; Can be found in the CCC


After a quench has been detected all of the quench heaters will be fired.

Lead Voltage will change polarity

Example of a full energy deposition test:

Q2 at 12 kA

Q1 (Q3) at 7kA(lead between Q1 – Q2 at IP1)


Q2 and Q1(Q3) magnet Half Coil Voltages

Maximum Voltages are within ± 50V


Q2 Heater signal measured on the Heater itself

To check the actual heater discharge curves total (cold heater + cable) resistances have to be measured prior to fire the heaters

M1 = 11.4 & 11.5 Ω M2 = 10.7 & 10.5 Ω Magnet Hi-pot = 1200v @ 2uA Heater Hi-Pot = 1400v @ 0.04uA


Heaters are fragile due to the heater wire specified by CERN

We have to reduce the number of heater firing as much as possible


Hello Sandor,Here is a table with the required information:IR L-side R-side1 D/F/D F/D/F2 F/D/F D/F/D5 D/F/D F/D/F8 F/D/F D/F/DF -> horizontally focusing quadrupole, i.e. the force pushes in the h-plane a positively charge particle rotating in the clock-wise direction (Beam 1) towards the centre of the magnet.D -> horizontally defocusing quadrupole, i.e. the force pushes in the h-plane a positively charge particle rotating in the clock-wise direction (Beam 1) away from the centre of the magnet.The sequence of three letters stand for Q1/Q2/Q3I hope this helps. Do not hesitate to contact me in case of questions. Cheers Massimo


Information on LHC IRQ Polarity

R. Bossert, M. Lamm

1-17-08


Direction of current shown by red arrows.

Figure 1. MQXB Coil Schematic

Every magnet has two leads, one designated “A” and one designated “B”. A schematic for the MQXB (used in Q2 cold mass) is shown in Figure 1. There is no schematic available for the Q1 or Q3 cold masses.

A

B

Quadrant 1 inner

Quadrant 1 outer

Quadrant 4 inner

Quadrant 3 inner

Quadrant 2 inner

Quadrant 4 outer

Quadrant 3 outer

Quadrant 2 outer

+

-


Figure 2.

Figure 3.Isometric of end

B lead from Quadrant 4

Q4 inner lead “B”

Q3 inner lead “A”

A lead from Quadrant 3.

For the MQXB, the A lead is the Quadrant 3 inner coil lead and the B lead is the Quadrant 4 inner coil lead, coming out of the magnet as shown in Figure 2 (looking into lead end) Q2 consists of two MQXBs postioned back to back. As the leads come out of the Q2 and enter the interconnection region, the A lead is on the top and the B lead is on the bottom, as shown in Figure 2.


2

3 4

1 X X

•

•

•

•

Leads L3 and L4 come out here in this direction

Figure 4.

A lead from Quadrant 3.

B lead from Quadrant 4

X X

X Current into paper

• Current out of paper

If the MQXB is powered so that the current flow is into the A” lead and out of the “B” lead, the field direction is as shown in Figure 4 (Verified by M. Lamm and J. DiMarco in October 2003). This field direction is designated the “forward” direction.


B lead splice, the one on top

MQXA to bus splice

MQXA (used for both Q1 and Q3 leads) exit the lead end of the magnet as shown in Figure 5. Q1 is configured exactly as shown. Q3 is rotated 180 degrees, but the busses are arranged so that the B lead is still on top when the leads enter the interconnection area.

A lead splice, the one underneath

Figure 5


For the MQXA in Q1, the lead end of the magnet is facing away from the IP, and configured as shown in Figure 6. “+” and “-” on right and left leads are from Akira Yamamoto April 2000. When looking into the lead end, the lead on the right, labeled “+” is called “A” and the lead on the left, labeled “-” is called “B” as shown.

When current flows into A and out of B lead it produces a field as shown designated “forward”. (Verified by M. Lamm and J. DiMarco in October 2003)

Figure 6 Lead end of Q1

UP

10mm x 50mm bus slot top and bottom

+- AB

A lead

B lead

When the leads enter the interconnection area, for the MQXA in Q1, the B lead is on top and the A lead is on the bottom.

Q1 Lead Configuration


When current flows into A and out of the B lead it produces a field as shown designated “forward”. (Verified by M. Lamm and J. DiMarco in October 2003)

When the leads enter the interconnection area, for the Q3, the B lead is on top and the A lead is on the bottom.

Q3 Lead Configuration

10mm x 50mm bus slot

up

Figure 7 Lead end of Q3

UP

10mm x 50mm bus slot top and bottom

+ -

A B

A lead

B lead

For the MQXA in Q3, the lead end of the magnet is facing toward from the IP, and configured is as shown in Figure 7. “+” and “-” on left and right leads are from Akira Yamamoto April 2000. When looking into the lead end, the lead on the left, labeled “+” is called “A” and the lead on the right, labeled “-” is called “B” as shown.


An electrical schematic of the triplet is shown in Figure 8. A and B leads are connected as shown, with current direction defined by the black arrows. As noted previously, A leads are on top for Q2, and B leads are on top for Q1 and Q3. “Forward focus” is defined as the focus from a magnet powered from A to B and placed in the “forward” direction, i.e., with the lead end facing the IP. So for each individual element:

“ForwardFocus”

A

B

Q1Q3 Q2b Q2aB

A A

AB

B“ForwardFocus”

“BackwardFocus”

“BackwardFocus”

IP

Q1: Powered from A to B, lead end facing IP, therefore “forward focus”.Q2a: Powered from A to B, lead end facing away from IP, therefore “backward focus”.Q2b: Powered from B to A, lead end facing IP, therefore “backward focus”.Q3: Powered from B to A, lead end facing away from IP, therefore “forward focus”.

Figure 8.

Conclusion

13.02.2008mpp meeting sandor feher inner triplet powering should include the ir quads and the dfbx...

Documents

mpp meeting sandor feherafter

ua mpp meeting sandor

pcmpp meeting sandor

vmpp meeting sandor

ip1mpp meeting sandor

cccmpp meeting sandor

samempp meeting sandor

qps mpp signals firing