**[LHC IR Quadrupole Acceptance Report Summary]{.underline}**

[**LQXA (Q1)** **Acceptance report includes these
criteria:**]{.underline}

2.1.3 THERMOMETER AND WARM UP HEATER INSTALLATION

Requirement: Thermometers and heaters installed properly

(Module assembly traveler)

2.1.4 BUS WORK CHECKOUT

Requirements: Bus work properly insulated, strain relieved

(Module assembly traveler)

2.1.5 ROOM TEMPERATURE HIPOT

Requirements: For completed LQXA: (1) with coil shorted to ground, hipot
heater to ground 3kV, (2) with heater shorted to ground, hipot coil to
ground 3 kV. Leakage current less than 3μA and no breakover.

(Cold mass traveler/module assembly traveler)

2.1.6 ROOM TEMPERATURE ELECTRICAL CHECKOUT

Requirements: Instrumentation wires are properly labelled, correct wire
gauge, correctly wired to instrumentation connector, proper continuity

(Module assembly traveler)

2.1.7 PRESSURE TEST DOCUMENTATION

Requirement: Test pressure of 1.25 times the design pressure. The design
pressure is 20 bar so the test pressure is 25 bar or approximately (2.5
Mpa).

(Section 5034 of the Fermilab ES&H Manual \[6\] and UG-100 of the ASME
Code)

2.1.8 LEAK CHECK DOCUMENTATION

Requirement: Follow requirements in Fermilab Specification ES-107240
\[9\]. Leak rate ≤ 2 10-9 atm cc/s.

(Cryostat assembly traveler)

2.1.9 CRYOSTAT SAFETY DOCUMENTATION

Requirement: Design according to ASME BPV Section VIII, Division I and
must meet all applicable safety codes in the FNAL ES&H Manual and
CERN/LHC -- US/LHC MoU on Accelerator Mechanical Safety

(ASME BPV Section VIII and Section 5034 FNAL ES&H Manual)

2.1.10 PIPE ASSEMBLY DOCUMENTATION

Requirement: See LHC-LQX-ES-0007 and reference drawings

(Cryostat assembly traveler)

2.1.11 WARM CRYOSTAT TO MAGNETIC AXIS REFERENCE

Requirements: See LHC-LQX-ES-0007

(LQXA Test Run Plan)

**[Summary of data for all LQXAs:]{.underline}**

**LQXA01 (MQXA01) -- passed all criteria**

**LQXA02 (MQXA02) -- passed all criteria**

**LQXA03 (MQXA03) -- passed all criteria**

**LQXA04 (MQXA04) -- passed all criteria**

**LQXA05 (MQXA05) -- passed all criteria**

**LQXA06 (MQXA06) -- passed all criteria**

**LQXA07 (MQXA08) -- passed all criteria**

**LQXA08 (MQXA09) -- passed all criteria except as noted below:**

2.1.3 - RTD (TT8321), the redundant RTD, was found to be open during the
inspection of the hypertronics connector, reason unknown. It was
operating properly prior to installation of the connector. A new RTD was
mounted at the non-IP end (both RTD's are normally at the IP end) inside
the helium pipe that is opposite to the pipe carrying the power leads.
New RTD leads were routed into the end dome and back out with the normal
instrumentation wire bundle. The leads to the open RTD were removed from
the hypertronics connector and insulated. The new RTD was wired into the
hypertronics connector. There were no problems with the cryogenic
(warm-up) heaters.

**LQXA09 (MQXA10) -- passed all criteria**

[**LQXB (Q2)** **Acceptance report includes these
criteria:**]{.underline}

2.1.1 MQXB MECHANICAL TWIST AND STRAIGHTNESS

Requirement: Less than 1 mR/5 m twist, 100 μm/5 m straightness

(Cold mass traveler)

2.1.2 MQXB COIL RINGING

Requirement: No evidence of coil to coil breakdown

(Cold mass traveler)

2.1.3 THERMOMETER AND WARM UP HEATER INSTALLATION

Requirement: Thermometers and heaters installed properly

(Module assembly traveler)

2.1.4 BUS WORK CHECKOUT

Requirements: Bus work properly insulated, strain relieved

(Module assembly traveler)

2.1.5 ROOM TEMPERATURE HIPOT

Requirement: In air or bagged in dry N2, Quadrant to quadrant (prior to
quadrant busing), 3 kV.

For completed LQXB 1) with coil shorted to ground, hipot heater to
ground 5kV, 2) with heater shorted to ground, hipot heater to ground 5
kV. Leakage current less than 5mA and no breakover.

(Cold mass traveler/module assembly traveler)

2.1.6 ROOM TEMPERATURE ELECTRICAL CHECKOUT

Requirements: Instrumentation wires are properly labelled, correct wire
gauge, correctly wired to instrumentation connector, proper continuity

(Module assembly traveler)

2.1.7 PRESSURE TEST DOCUMENTATION

Requirement: Test pressure of 1.25 times the design pressure. The design
pressure is 20 bar so the test pressure is 25 bar or approximately (2.5
Mpa).

2.1.8 LEAK CHECK DOCUMENTATION

Requirement: Follow requirements in Fermilab Specification ES-107240
\[2\]

(Cryostat assembly traveler)

2.1.9 CRYOSTAT SAFETY DOCUMENTATION

Requirement: Design according to ASME BPV Section VIII, Division I and
must meet all applicable Fermilab safety codes.

2.1.10 PIPE ASSEMBLY DOCUMENTATION

Requirement: See LHC-LQX-ES-0007 \[6\] and reference drawings

(Cryostat assembly traveler)

2.1.11 WARM CRYOSTAT TO MAGNETIC AXIS REFERENCE

Requirements: See LHC-LQX-ES-0007

2.2.1 COLD INSTRUMENTATION CHECK OUT

Requirement: Instrumentation wires have proper continuity, no shorts to
ground

2.2.2 COLD HEATER CHECKOUT

Requirements: Heater circuits have proper resistance, quenches all
quadrants

2.2.3 COLD ELECTRICAL HIPOT

Requirement: On test stand, in liquid helium, coil to ground/heater can
withstand 1.2 kV voltage difference with leakage current less than 5mA,
heater to ground/coil can withstand 1.4 kV voltage difference with
leakage current less than 5mA

2.2.4 NO QUENCHING UP TO AND INCLUDING OPERATING GRADIENT (AFTER
TRAINING)

Requirement: Magnet reaches 230T/m during first 1.9 K thermal cycle~~,
reaches 220T/m on 2nd and successive thermal cycles without quenching~~

(dropped from the test plan)

2.2.5 NO TRAINING DEGRADATION AFTER FULL ENERGY DEPOSITION TRIP (SEE
ABOVE)

Requirement: ~~Magnet reaches 220 T/m after full energy deposition
quench~~

(dropped from the test plan)

2.2.6 TRANSFER FUNCTION

Requirement: Gradient /excitation current correlation

2.2.7 INTEGRATED COLD HARMONICS

Requirements: Harmonics fall within acceptance table limits.

2.2.8 COLD ALIGNMENT

Requirements: See LHC-LQX-ES-0007

**[Summary of data for all LQXBs:]{.underline}**

**LQXB01 (MQXB01, MQXB02) -- passed all criteria except as noted
below:**

## discussion on the MQXB mechanical twist and straightness

> (Section 2.1.1): The straightness of MQXB01 was 150μm, 25μm above
> allowable over the length (5.8m) of the magnet, where the least count
> is also 25μm. Given the measurements to be done on the beam tube
> location in later magnets of the series, and the apparent
> insensitivity of the machince aperture to this result, the tolerance
> should be revisited.

## Discussion on Heater circuit "b" on Q2B:

> (Section 2.1.5): Heater circuit "b" on Q2b (YT1142) has a \~30 Mohm
> short to the coil. This short was detected after a coil to
> (ground+heater) hipot failure at room temperature. With this heater
> circuit floating, the hipot test was successfully completed. This high
> resistance short has remained throughout the testing and post cold
> test electrical checkout.
>
> (Section 2.2.2): Because of the high resistance short to ground, Q2b
> circuit "b" heater (YT1142) was not tested cold. The other three
> circuits were extensively tested and shown to be effective.
>
> (Section 2.2.3): The high resistance to ground heater (YT1142) is
> floated during these tests. The three operating heater circuits were
> successfully hipoted from heater to (ground + coil) to the required
> 1400 V. However for the coil to ground + heater test, the maximum
> voltage achieved was 1100 V. (100 V less than the required 1200V)
>
> This cold hipot must be accomplished using the test stand
> instrumentation and bus feed throughs. We had several hipot problems
> with our test stand, problems we finally isolated and fixed but only
> after several months of investigation and only after a feed can-to-end
> can (zero magnet) cold test. By this time LQXB01 was removed from the
> test stand. In fairness we note that we do not fully understand the
> relationship between the breakdown level and location observed on the
> zero magnet test stand tests and that observed on the magnet + test
> stand tests. However, the wiring and grounding for this test stand is
> quite complicated, with instrumentation wires and shielding ground
> lines fanned out to several connectors.
>
> Despite these test stand problems, the magnet passed other hipot tests
> which give us confidence in its hipot integrity. For example, it
> passed the 5kV in air hipot as show in 2.2.2. above. It also passed a
> 4 atmosphere warm helium hipot test to \>1400 V, which from the
> literature is more stringent than a 1 atmosphere cold helium test.
> After the magnet was removed from the tests stand, in room temperature
> N2, there was a final hipot test of heaters to (ground + coils) to
> 1500 V and coils to (ground + heaters) to 1500 V with low leakage
> current and no breakovers.
>
> Note that for checkout at CERN heater YT1142 has been disconnected
> from the Hypertronics pins assigned to it such that it can not be
> inadvertently used during machine operation.

## Discussion on surveyed pipe locations:

> Several of the pipe locations are out of tolerance by xx mm (final
> survey has not been done as yet, we will include a table here). Given
> that the inner triplet interconnects have an extension piece of on
> order 1m between the magnet flanges, and the nominal failure mode is
> that of bellows instability or inability to make the connection of
> components inside the pipe, the increase length between connections
> gives greater latitude for misalignment than might be acceptable
> elsewhere in the machine. All bellows are restrained during operation,
> further limiting the potential for squirm. For this reason, the
> committee recommends the tolerances be re-visited.

## Discussion on cold alignment:

> The appended note from M. Xiao and T. Sen documents the affect on
> machine dynamic aperture using the actual offsets from the measured
> cold alignment of LQXB01. The results show the misalignment does not
> affect the machine dynamic aperture.
>
> LQXB01 was the first of its kind, ever made. As more data is generated
> as later assemblies in the series are made, the acceptance criteria
> for cold alignment should be re-visited.

## other:

> LQXB01 includes corrector MCBXT001, a prototype MCBX from CERN which
> has 2/3 of the magnetic length of a production MCBX
> (LHC-MCBX-EC-0001). When this change was accepted, it was noted the
> assembly would be used in IR2 or IR8 only.

**LQXB03 (MQXB05, MQXB06) -- passed all criteria except as noted
below:**

## Discussion on surveyed pipe locations:

> (Section 2.1.10): For all the lines where the tubes are out of
> tolerance (with the exception of the V line -- see below), neither the
> assembly of the interconnect flanges on the neighboring magnet
> assembly (including the interconnect pipe section which spans the \~1m
> gap between the two), nor the allowable motion due to the desired
> alignment of the magnets in the tunnel, nor the lifetime of the
> bellows associated with each individual tube are expected to be
> limited. We are reviewing the collected LQXB data to come up with more
> realistic targets.
>
> For the V line, the deviation is consistent with the magnetic axis
> shift between the magnets. A final optimization of the magnetic axes
> of the two magnets will need to be done at CERN, before installation
> in the LHC tunnel. The warm measurement of the magnetic axes using the
> SSW at CERN will be done as a matter of course for all the magnets in
> any event, to check for any motions which may occur during shipping.
> We suggest that Fermilab personnel be present during that process, and
> optimize the magnetic position at that time.

## Discussion on cold Harmonics:

> (Section 2.2.7): The skew decapole and dodecapole at injection have
> some hysterisis placing them beyond 3 sigma. This was seen in the skew
> decapole as well in LQXB01. The higher order multipoles beyond 3 sigma
> at injection are likely due to measurement error.

## Discussion on cold alignment:

> (Section 2.2.8): The discrepancy in the magnetic axes of the two MQXB
> is relatively large. We recognized the cold masses should be adjusted
> but chose not to do so before shipping. We suggest that this be done
> at CERN in conjunction with warm SSW measurement as well. Fermilab
> will provide the expertise and labor to do the adjustment if
> necessary. (See also the discussion on surveyed pipe locations.)
> Adjustment at CERN will also allow for compensation of changes in
> magnet positions during shipping, if any.
>
> The cold bore position with respect to the warm magnetic axis is
> reported on the ID Card. The deviations are relatively large
> particularly at the IP end consistent with the IP end pipe survey
> data.
>
> There is a warm to cold shift of the magnetic axis of +0.028mm in X
> and -0.204mm in Z, all data to date suggest that the cold bore tracks
> the magnetic axis well.

**LQXB04 (MQXB10, MQXB12) -- passed all criteria except as noted
below:**

> 2.1.3: On Q2a (MQXB10), both thermometers were damaged during
> hipotting. They were replaced by new thermometers, which were mounted
> on the MCBX corrector skin. The new ones are operating normally.
> Damaged thermometers are serial numbers CX-LS-X16764 and CX-LS-X16766.
> They were replaced by CX-LS-16744 and CX-LS-16131. Otherwise all
> thermometer and warm-up heater installation was normal.
>
> 2.2.7 Harmonics between the 2 and 3 sigma acceptance bands at
> collision: b~8~, b~10~, a~8~; greater than 3 sigma: b~9~, a~9~, a~10~.
>
> 2.2.8 Relative y average axes (-0.6, mm\>0.5); relative corrector roll
> (11 mrad\>5, both normal and skew)

**LQXB05 (MQXB11, MQXB08) -- passed all criteria except as noted
below:**

> 2.2.7 Harmonics between the 2 and 3 sigma acceptance bands at
> collision: b~8~; greater than 3 sigma: b~9~, a~6~, a~8~, a~9,~ a~10~.
>
> 2.2.8 Relative x average axes (0.9 mm\>0.5)

**LQXB06 (MQXB07, MQXB09) -- passed all criteria except as noted
below:**

> 2.1.1 Twist within spec on both cold masses. Straightness within spec
> on MQXB07. Straightness on MQXB09 measured up to 575um in vertical
> direction and 750um in horizontal direction.
>
> 2.1.3 All thermometer and warm-up (cryogenic) heater installation was
> OK. Thermometers (RTD's) removed and replaced on both cold masses when
> magnet was disassembled for strip heater repair.
>
> 2.2.2 Q2 section of Q2a (MQXB07) heater strip "A" bypassed
>
> 2.2.7 Harmonics between the 2 and 3 sigma acceptance bands at
> collision: none; greater than 3 sigma: none.
>
> 2.2.8 [as measured]{.underline} relative x, y average offset (-1.3,
> 0.53 mm \> 0.5); pitch, yaw (-0.16, -0.35 mrad \> 0.1)

**LQXB08 (MQXB03, MQXB13) -- passed all criteria except as noted
below:**

> 2.1.10: For all the lines that are out of tolerance, neither the
> assembly of the interconnect flanges on the neighboring magnet
> assembly (including the interconnect pipe section which spans the \~1m
> gap between the two), nor the allowable motion due to the desired
> alignment of the magnets in the tunnel, nor the lifetime of the
> bellows associated with each individual tube are expected to be
> limited.
>
> 2.2.6 Integral field strength is 1.5σ low.
>
> 2.2.7 Harmonics between the 2 and 3 sigma acceptance bands at
> collision: none; greater than 3 sigma: none.
>
> 2.2.8
>
> [as measured]{.underline} relative x, y average axes (2.5, 2.9
> mm\>0.5); pitch, yaw (-0.73, -0.25 mrad \> 0.1) [expected "as
> installed"]{.underline} relative x, y average axes (1.6, -0.8
> mm\>0.5); pitch (0.41 mrad\>0.1); a1 corrector roll (-6 mrad\>5)

**LQXB09 (MQXB17, MQXB16) -- passed all criteria except as noted
below:**

> 2.2.6 Integral field strength is 1.02σ low.
>
> 2.2.7 Harmonics between the 2 and 3 sigma acceptance bands at
> collision: none; greater than 3 sigma: none.
>
> 2.2.8 [as measured]{.underline} relative x, y average axes (x.x, x.x
> mm\>0.5); pitch, yaw (0.xx, 0.xx mrad \> 0.1) [expected "as
> installed"]{.underline} relative x, y average axes (y.y, y.y mm\>0.5);
> pitch (y.y mrad\>0.1); a1 corrector roll (y.y mrad\>5)
>
> 2.1.10: For all the lines that are out of tolerance, neither the
> assembly of the interconnect flanges on the neighboring magnet
> assembly (including the interconnect pipe section which spans the \~1m
> gap between the two), nor the allowable motion due to the desired
> alignment of the magnets in the tunnel, nor the lifetime of the
> bellows associated with each individual tube are expected to be
> limited.

**LQXB10 (MQXB19, MQXB18) -- passed all criteria except as noted
below:**

> 2.1.1 Twist within tolerance on both cold masses. Straightness maximum
> of 775 microns on MQXB18 and 500 microns on MQXB19 exceeded tolerance
> criteria.
>
> 2.2.6 Integral field strength is 1.4σ low, 2.3 T outside the
> acceptance band.
>
> 2.2.7 Harmonics between the 2 and 3 sigma acceptance bands at
> collision: a~8~; greater than 3 sigma: none.
>
> 2.2.8 [as measured:]{.underline} relative x average offset (-1.9
> mm\>0.5); pitch, yaw (-0.39, 0.25 mrad \> 0.1)

**LQXB11 (MQXB20, MQXB15) -- passed all criteria except as noted
below:**

> 2.1.1 Twist within spec on both cold masses
>
> Straightness within 350um on MQXB15 and within 300um on MQXB20
>
> 2.2.8 [as measured:]{.underline} relative x average offset (-1.5
> mm\>0.5); pitch, yaw (0.27, -0.50 mrad \> 0.1)

[**LQXC (Q3)** **Acceptance report includes these
criteria:**]{.underline}

2.1.3 THERMOMETER AND WARM UP HEATER INSTALLATION

Requirement: Thermometers and heaters installed properly

(Module assembly traveler)

2.1.4 BUS WORK CHECKOUT

Requirements: Bus work properly insulated, strain relieved

(Module assembly traveler)

2.1.5 ROOM TEMPERATURE HIPOT

Requirements: For completed LQXA: (1) with coil shorted to ground, hipot
heater to ground 3kV, (2) with heater shorted to ground, hipot coil to
ground 3 kV. Leakage current less than 3μA and no breakover.

(Cold mass traveler/module assembly traveler)

2.1.6 ROOM TEMPERATURE ELECTRICAL CHECKOUT

Requirements: Instrumentation wires are properly labelled, correct wire
gauge, correctly wired to instrumentation connector, proper continuity

(Module assembly traveler)

2.1.7 PRESSURE TEST DOCUMENTATION

Requirement: Test pressure of 1.25 times the design pressure. The design
pressure is 20 bar so the test pressure is 25 bar or approximately (2.5
Mpa).

(Section 5034 of the Fermilab ES&H Manual \[6\] and UG-100 of the ASME
Code)

2.1.8 LEAK CHECK DOCUMENTATION

Requirement: Follow requirements in Fermilab Specification ES-107240
\[9\]. Leak rate ≤ 2 10-9 atm cc/s.

(Cryostat assembly traveler)

2.1.9 CRYOSTAT SAFETY DOCUMENTATION

Requirement: Design according to ASME BPV Section VIII, Division I and
must meet all applicable safety codes in the FNAL ES&H Manual and
CERN/LHC -- US/LHC MoU on Accelerator Mechanical Safety

(ASME BPV Section VIII and Section 5034 FNAL ES&H Manual)

2.1.10 PIPE ASSEMBLY DOCUMENTATION

Requirement: See LHC-LQX-ES-0007 and reference drawings

(Cryostat assembly traveler)

2.1.11 WARM CRYOSTAT TO MAGNETIC AXIS REFERENCE

Requirements: See LHC-LQX-ES-0007

(LQXA Test Run Plan)

**[Summary of data for all LQXCs:]{.underline}**

**LQXC01 (MQXA07) -- passed all criteria**

**LQXC02 (MQXA12) -- passed all criteria**

**LQXC03 (MQXA13) -- passed all criteria except as noted below:**

> 2.1.3 All cryogenic (warmup) heaters function normally.
>
> One thermometer (primary, on IP end) functions normally. The redundant
> thermometer (on non-IP end) failed after the hypertronics connector
> was installed. It was replaced with a new one, mounted onto the top of
> the MCBXA corrector shell, longitudinally within 2 centimeters of the
> "far" end of the corrector (away from the magnet). This thermometer
> functions normally.

**LQXC04 (MQXA14) -- passed all criteria**

**LQXC05 (MQXA15) -- passed all criteria except as noted below:**

> 2.1.4: After installation of the hypertronics connector, electrical
> measurements revealed that the 8U lead was switched with the 5U lead,
> and that the 8L lead was switched with the 5L lead (documented in
> discrepancy report #4294, module assembly traveler TR-333729). This
> occurred in the \"crossover block\" that is attached to the top of the
> MCBXA corrector on the non-IP (DFBX) end of the Q3.  Thus from the top
> of the corrector, to their entry into the spider, the 8U is correctly
> bundled over the 8L and the 5U is correctly bundled over the 5L, but
> the lateral positions of the bundles were switched with respect to the
> beam tube.  The repair consisted of re-crossing the leads back into
> the proper configuration within the pipe after they exit the spider. 
> Each lead is tinned in the crossing region to maintain shape and
> separated by G-11 forms before being wrapped individually with kapton,
> then together with glass tape.  The leads subsequently passed all
> electrical tests.

**LQXC06 (MQXA16) -- passed all criteria**

**LQXC07 (MQXA17) -- passed all criteria**

**LQXC08 (MQXA18) -- passed all criteria except as noted below:**

> 2.1.4: Force required to push lead bus into installed position varies
> from magnet to magnet. The force required to push the non-IP end of
> LQXC08 into position is at the high end, but can be put into the
> installed position. If desired, the bus on LQXC08 can be positioned as
> much as 8mm farther toward the DFBX (in other words, not as far into
> the Q3) than the installed position according to the design. There
> will still be enough travel to move to the "cold" position (this
> applies only to LQXC08).

**LQXC09 (MQXA19) -- passed all criteria**