T. Nicol - Academia.edu (original) (raw)

Papers by T. Nicol

A vertical dewar for the test of 9 -cell 1.3 Ghz cavities is the first component of the cryogenic... more A vertical dewar for the test of 9 -cell 1.3 Ghz cavities is the first component of the cryogenics of the Tesla Test Facility which was brought into operation. During the tests of two prototype cavities and temperature mapping experiments with a single cell cavity, the cryogenic performance of this vertical dewar was monitored: with a static heat load of

ABSTRACT Superconducting spoke resonators (SSR1 and SSR2) envisioned for Project X will be develo... more ABSTRACT Superconducting spoke resonators (SSR1 and SSR2) envisioned for Project X will be developed in Fermilab and operated at temperatures down to 2 K in continuous wave (CW) mode. Each spoke cavity will be tested individually in a cryostat that replicates conditions in the longer multi-cavity cryomodules. This test cryostat has all the features of the longer cryomodules - magnetic shielding, 80 K thermal shield, multi-layer insulation, support post, and input coupler [1]. Fermilab is in the processing of retrofitting the existing test cryostat which was originally designed for operation at 4.5 K. This paper describes the design of the conversion of the current test cryostat, flexible transfer lines, helium relief system and cryogenics interface.

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2013

IEEE Transactions on Applied Superconductivity, 2006

The LHC performance depends critically on the low-β  triplets, located on either side of the fou... more The LHC performance depends critically on the low-β  triplets, located on either side of the four interaction points. Each triplet consists of four superconducting quadrupole magnets, which must operate reliably at up to 215 T/m, sustain extremely high heat loads and have an excellent field quality. A collaboration of CERN, Fermilab and KEK was formed in 1996 to design and build the triplet systems, and after nine years of joint effort the production has been completed in 2005. We retrace the main events of the project and present the design features and performance of the low-β quadrupoles, built by KEK and Fermilab, as well as of other vital elements of the triplet. The tunnel installation of the first triplet and plans for commissioning in the LHC are also presented. Apart from the excellent technical results, the construction of the LHC low-β triplets has been a highly enriching experience combining harmoniously the different competences and approaches to engineering in a style reminiscent of high energy physics experiment collaborations, and rarely before achieved in construction of an accelerator.

We present the results of a design study of synchrotron radiation absorbers, or photon stops, con... more We present the results of a design study of synchrotron radiation absorbers, or photon stops, conducted in the context of a recent study of a Very Large Hadron Collider (VLHC), . Photon stops protrude into the beam tube at the end of each bending magnet to absorb the synchrotron radiation emitted by the beams. They operate at room temperature and thus with minimal cooling power. Major issues regarding photon stops, namely those related to ring-size and magnet aperture, the engineering design, photo-desorption and vacuum, electron-emission, X-ray fluorescence and beam effects will be discussed. Simulations were performed on the basis of the VLHC in its second, high-field-magnet stage design, denoted as VLHC-2 in the following. We show that photon stops are a promising solution for the synchrotron radiation problem of future hadron colliders.

In support of the Charged Kaons at the Main Injector (CKM) experiment, an SRF cryomodule was desi... more In support of the Charged Kaons at the Main Injector (CKM) experiment, an SRF cryomodule was designed, assembled, and tested at Fermilab. The cryomodule prototype consists of a single niobium 13-cell 3.9 GHz superconducting RF cavity installed in its horizontal cryostat. The prototype was simplified to hold an additional dummy cavity in place of a second 13-cell SRF cavity. Although this cryomodule was originally intended for beamline deflection in the CKM experiment, this first preliminary test aims to compliment existing vertical 3-cell 3.9 GHz SRF cavity testing and also to gain expertise in the field of SRF testing. The cryomodule's thermal and mechanical design is reported. The test process and instrumentation is described. The first operational cooldown with RF powering is discussed and some cryogenic results are given.

Proceedings of the 2005 Particle Accelerator Conference, 2005

The performance of the LHC depends critically on the low-β WULSOHWV ORFDWHG RQ HLWKHU VLGH RI WKH... more The performance of the LHC depends critically on the low-β WULSOHWV ORFDWHG RQ HLWKHU VLGH RI WKH IRXr interaction points. Each triplet consists of four superconducting quadrupole magnets, which must operate reliably at up to 215 T/m, sustain high heat loads and have an excellent field quality. A collaboration between CERN, Fermilab and KEK was set up in 1996 to design and build the triplet systems, and after nine years of joint effort the production will be completed in 2005. We retrace the main events of the project and present the performance of the low-β quadrupoles built by KEK and Fermilab and of other elements of the triplet. The assembly of the first triplet at CERN and plans for tunnel installation and commissioning in the LHC are also reported.

Page 1. RHIC/AP/102 June 1996 EPAC/LHC Magnet Papers G. Ambrosio, FM Ametrano, F. Broggi, A. Ferr... more Page 1. RHIC/AP/102 June 1996 EPAC/LHC Magnet Papers G. Ambrosio, FM Ametrano, F. Broggi, A. Ferrari and L. Rossi, "Stability of a NbSn Low-Beta Quadrupole in the LHC Radiation Environment" G. Ambrosio, G. Bellomo ...

The recently revived superconducting magnet program at Fermilab is currently focused on the devel... more The recently revived superconducting magnet program at Fermilab is currently focused on the development of high gradient quadrupoles for possible use in the Large Hadron Collider (LHC) interaction regions at CERN. In order to provide input for the new quadrupole design which will operate in superfluid helium, we have tested a Fermilab Tevatron low-β quadrupole cold mass and compared its

The LHC Interaction Region Quadrupoles (IRQ) will be shipped from Fermilab to CERN. The IRQ magne... more The LHC Interaction Region Quadrupoles (IRQ) will be shipped from Fermilab to CERN. The IRQ magnets are supported by glass fiber supports. A prototype cryostat support has been tested under various mechanical forces in order to check its mechanical behavior. These measurements have been made in order to validate a numerical model. A large range of mechanical loads simulates loads due to the shipment of the device, the weight of the cold mass as well as the cool down conditions. Its mechanical properties are measured by means of a dedicated arrangement operating at room temperature. This study appears to be essential to optimize the design of the support. The purpose of this note is to summarize the first measurements related to mechanical tests performed with the support.

IEEE Transactions on Appiled Superconductivity, 1997

The recently revived superconducting magnet program at Fermilab is currently focused on the devel... more The recently revived superconducting magnet program at Fermilab is currently focused on the development of high gradient quadrupoles for possible use in the Large Hadron Collider (LHC) interaction regions at CERN. In order to provide input for the new quadrupole design which will operate in superfluid helium, we have tested a Fermilab Tevatron low-β quadrupole cold mass and compared its low temperature performance to a newly assembled heavily instrumented version which was mechanically modified to take advantage of the gain in critical current

IEEE Transactions on Applied Superconductivity, 2006

The LHC performance depends critically on the low-β  triplets, located on either side of the fou... more The LHC performance depends critically on the low-β  triplets, located on either side of the four interaction points. Each triplet consists of four superconducting quadrupole magnets, which must operate reliably at up to 215 T/m, sustain extremely high heat loads and have an excellent field quality. A collaboration of CERN, Fermilab and KEK was formed in 1996 to design and build the triplet systems, and after nine years of joint effort the production has been completed in 2005. We retrace the main events of the project and present the design features and performance of the low-β quadrupoles, built by KEK and Fermilab, as well as of other vital elements of the triplet. The tunnel installation of the first triplet and plans for commissioning in the LHC are also presented. Apart from the excellent technical results, the construction of the LHC low-β triplets has been a highly enriching experience combining harmoniously the different competences and approaches to engineering in a style reminiscent of high energy physics experiment collaborations, and rarely before achieved in construction of an accelerator.

IEEE Transactions on Appiled Superconductivity, 2005

The US-LHC Accelerator Project is responsible for the production of the Q2 optical elements of th... more The US-LHC Accelerator Project is responsible for the production of the Q2 optical elements of the final focus triplets in the LHC interaction regions. As part of this program Fermilab is in the process of manufacturing and testing cryostat assemblies (LQXB) containing two identical quadrupoles (MQXB) with a dipole corrector between them. The 5.5 m long Fermilab designed MQXB have a 70 mm aperture and operate in superfluid helium at 1.9 K with a peak field gradient of 215 T/m. This paper summarizes the test results of several production MQXB quadrupoles with emphasis on quench performance and alignment studies. Quench localization studies using quench antenna signals are also presented.

IEEE Transactions on Appiled Superconductivity, 2003

High-gradient superconducting quadrupole magnets are being developed by the US LHC Accelerator Pr... more High-gradient superconducting quadrupole magnets are being developed by the US LHC Accelerator Project for the Interaction Regions of the Large Hadron Collider. Determination of the magnetic axis for alignment of these magnets will be performed using a single stretched wire system. These measurements will be done both at room and cryogenic temperatures with very long wire lengths, up to 20m. This paper reports on the stretched wire alignment methodology to be employed and the results of recent room-temperature measurements on a 2 m model magnet with long wire lengths.

IEEE Transactions on Applied Superconductivity, 2000

Fermilab, as part of the US-LHC Accelerator Project, is producing superconducting low-beta quadru... more Fermilab, as part of the US-LHC Accelerator Project, is producing superconducting low-beta quadrupole magnets for the Large Hadron Collider (LHC). These 5.5 m long magnets are designed to operate in superfluid helium at 1.9 K with a nominal gradient of 205 T/m in the 70 mm bore. Two quadrupoles separated by a dipole orbit corrector in a single cryogenic assembly comprise the Q2 optical elements of the final focus triplets in the LHC interaction regions. The field quality of the quadrupoles is measured at room temperature during construction of the cold masses as well as during cold testing of the cryogenic assembly. We summarize data from the series measurements of the magnets and discuss various topics of interest.

IEEE Transactions on Appiled Superconductivity, 2001

Fermilab, in collaboration with LBNL and BNL, is developing a quadrupole for installation in the ... more Fermilab, in collaboration with LBNL and BNL, is developing a quadrupole for installation in the interaction region inner triplets of the LHC. This magnet is required to have an operating gradient of 215 T/m across a 70mm coil bore, and operates in superfluid helium at 1.9K. A 2m magnet program addressing mechanical, magnetic, quench protection, and thermal issues associated with the design was completed earlier this year, and production of the first full length, cryostatted prototype magnet is underway. This paper summarizes the conclusions of the 2m program, and the design and status of the first full-length prototype magnet.

A new superconducting RF cavity test facility has been commissioned at Fermilab in conjunction wi... more A new superconducting RF cavity test facility has been commissioned at Fermilab in conjunction with first tests of a 325 MHz, β = 0.22 superconducting single-spoke cavity dressed with a helium jacket and prototype tuner. The facility is described and results of full gradient, CW cavity tests with a high Q ext drive coupler are reported. Sensitivities to Q disease and externally applied magnetic fields were investigated. Results are compared to bare cavity results obtained prior to hydrogen degassing and welding into the helium jacket.

In the recently commissioned superconducting RF cavity test facility at Fermilab (SCTF), a 325 MH... more In the recently commissioned superconducting RF cavity test facility at Fermilab (SCTF), a 325 MHz, β=0.22 superconducting single-spoke resonator (SSR1) has been tested for the first time with its input power coupler. Previously, this cavity had been tested CW with a low power, high Q ext test coupler; first as a bare cavity in the Fermilab Vertical Test Stand and then fully dressed in the SCTF.

The Fermilab High Intensity Neutrino Source (HINS) Linac R&D program is building a first-of-a-kin... more The Fermilab High Intensity Neutrino Source (HINS) Linac R&D program is building a first-of-a-kind 60 MeV superconducting H-linac. The HINS Linac incorporates superconducting solenoids for transverse focusing, high power RF vector modulators for independent control of multiple cavities powered from a single klystron, and superconducting spoke-type accelerating cavities starting at 10 MeV. This will be the first application and demonstration of any of these technologies in a lowenergy, high-intensity proton/H-linear accelerator. The HINS effort is relevant to a high intensity, superconducting H-linac that might serve the next generation of neutrino physics and muon storage ring/collider experiments. An overview of the HINS program, machine design, status, and outlook is presented.

The LHC inner triplet is cooled with pressurized He II at a temperature of around 1.9 K. The tota... more The LHC inner triplet is cooled with pressurized He II at a temperature of around 1.9 K. The total heat load (beam induced heat load plus static heat load for the inner triplet) at nominal luminosity is around 180 W. The beam induced heat load distributed within the magnet coil is carried away by the static pressurized He II filling inside of the cold mass. A heat exchanger is needed to absorb the heat load within the pressurized He II to maintain the low temperature. The heat exchanger is located outside and parallel to the magnet cold mass. The saturated, two-phase He II flows inside the corrugated pipe and the static, pressurized He II surrounds the corrugated pipe. A full-sized Heat Exchanger Test Unit has been designed to simulate the LHC inner triplet cooling scheme. The test will be carried out at CERN in 2000.

A vertical dewar for the test of 9 -cell 1.3 Ghz cavities is the first component of the cryogenic... more A vertical dewar for the test of 9 -cell 1.3 Ghz cavities is the first component of the cryogenics of the Tesla Test Facility which was brought into operation. During the tests of two prototype cavities and temperature mapping experiments with a single cell cavity, the cryogenic performance of this vertical dewar was monitored: with a static heat load of

ABSTRACT Superconducting spoke resonators (SSR1 and SSR2) envisioned for Project X will be develo... more ABSTRACT Superconducting spoke resonators (SSR1 and SSR2) envisioned for Project X will be developed in Fermilab and operated at temperatures down to 2 K in continuous wave (CW) mode. Each spoke cavity will be tested individually in a cryostat that replicates conditions in the longer multi-cavity cryomodules. This test cryostat has all the features of the longer cryomodules - magnetic shielding, 80 K thermal shield, multi-layer insulation, support post, and input coupler [1]. Fermilab is in the processing of retrofitting the existing test cryostat which was originally designed for operation at 4.5 K. This paper describes the design of the conversion of the current test cryostat, flexible transfer lines, helium relief system and cryogenics interface.

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2013

IEEE Transactions on Applied Superconductivity, 2006

The LHC performance depends critically on the low-β  triplets, located on either side of the fou... more The LHC performance depends critically on the low-β  triplets, located on either side of the four interaction points. Each triplet consists of four superconducting quadrupole magnets, which must operate reliably at up to 215 T/m, sustain extremely high heat loads and have an excellent field quality. A collaboration of CERN, Fermilab and KEK was formed in 1996 to design and build the triplet systems, and after nine years of joint effort the production has been completed in 2005. We retrace the main events of the project and present the design features and performance of the low-β quadrupoles, built by KEK and Fermilab, as well as of other vital elements of the triplet. The tunnel installation of the first triplet and plans for commissioning in the LHC are also presented. Apart from the excellent technical results, the construction of the LHC low-β triplets has been a highly enriching experience combining harmoniously the different competences and approaches to engineering in a style reminiscent of high energy physics experiment collaborations, and rarely before achieved in construction of an accelerator.

We present the results of a design study of synchrotron radiation absorbers, or photon stops, con... more We present the results of a design study of synchrotron radiation absorbers, or photon stops, conducted in the context of a recent study of a Very Large Hadron Collider (VLHC), . Photon stops protrude into the beam tube at the end of each bending magnet to absorb the synchrotron radiation emitted by the beams. They operate at room temperature and thus with minimal cooling power. Major issues regarding photon stops, namely those related to ring-size and magnet aperture, the engineering design, photo-desorption and vacuum, electron-emission, X-ray fluorescence and beam effects will be discussed. Simulations were performed on the basis of the VLHC in its second, high-field-magnet stage design, denoted as VLHC-2 in the following. We show that photon stops are a promising solution for the synchrotron radiation problem of future hadron colliders.

In support of the Charged Kaons at the Main Injector (CKM) experiment, an SRF cryomodule was desi... more In support of the Charged Kaons at the Main Injector (CKM) experiment, an SRF cryomodule was designed, assembled, and tested at Fermilab. The cryomodule prototype consists of a single niobium 13-cell 3.9 GHz superconducting RF cavity installed in its horizontal cryostat. The prototype was simplified to hold an additional dummy cavity in place of a second 13-cell SRF cavity. Although this cryomodule was originally intended for beamline deflection in the CKM experiment, this first preliminary test aims to compliment existing vertical 3-cell 3.9 GHz SRF cavity testing and also to gain expertise in the field of SRF testing. The cryomodule's thermal and mechanical design is reported. The test process and instrumentation is described. The first operational cooldown with RF powering is discussed and some cryogenic results are given.

Proceedings of the 2005 Particle Accelerator Conference, 2005

The performance of the LHC depends critically on the low-β WULSOHWV ORFDWHG RQ HLWKHU VLGH RI WKH... more The performance of the LHC depends critically on the low-β WULSOHWV ORFDWHG RQ HLWKHU VLGH RI WKH IRXr interaction points. Each triplet consists of four superconducting quadrupole magnets, which must operate reliably at up to 215 T/m, sustain high heat loads and have an excellent field quality. A collaboration between CERN, Fermilab and KEK was set up in 1996 to design and build the triplet systems, and after nine years of joint effort the production will be completed in 2005. We retrace the main events of the project and present the performance of the low-β quadrupoles built by KEK and Fermilab and of other elements of the triplet. The assembly of the first triplet at CERN and plans for tunnel installation and commissioning in the LHC are also reported.

Page 1. RHIC/AP/102 June 1996 EPAC/LHC Magnet Papers G. Ambrosio, FM Ametrano, F. Broggi, A. Ferr... more Page 1. RHIC/AP/102 June 1996 EPAC/LHC Magnet Papers G. Ambrosio, FM Ametrano, F. Broggi, A. Ferrari and L. Rossi, "Stability of a NbSn Low-Beta Quadrupole in the LHC Radiation Environment" G. Ambrosio, G. Bellomo ...

The recently revived superconducting magnet program at Fermilab is currently focused on the devel... more The recently revived superconducting magnet program at Fermilab is currently focused on the development of high gradient quadrupoles for possible use in the Large Hadron Collider (LHC) interaction regions at CERN. In order to provide input for the new quadrupole design which will operate in superfluid helium, we have tested a Fermilab Tevatron low-β quadrupole cold mass and compared its

The LHC Interaction Region Quadrupoles (IRQ) will be shipped from Fermilab to CERN. The IRQ magne... more The LHC Interaction Region Quadrupoles (IRQ) will be shipped from Fermilab to CERN. The IRQ magnets are supported by glass fiber supports. A prototype cryostat support has been tested under various mechanical forces in order to check its mechanical behavior. These measurements have been made in order to validate a numerical model. A large range of mechanical loads simulates loads due to the shipment of the device, the weight of the cold mass as well as the cool down conditions. Its mechanical properties are measured by means of a dedicated arrangement operating at room temperature. This study appears to be essential to optimize the design of the support. The purpose of this note is to summarize the first measurements related to mechanical tests performed with the support.

IEEE Transactions on Appiled Superconductivity, 1997

The recently revived superconducting magnet program at Fermilab is currently focused on the devel... more The recently revived superconducting magnet program at Fermilab is currently focused on the development of high gradient quadrupoles for possible use in the Large Hadron Collider (LHC) interaction regions at CERN. In order to provide input for the new quadrupole design which will operate in superfluid helium, we have tested a Fermilab Tevatron low-β quadrupole cold mass and compared its low temperature performance to a newly assembled heavily instrumented version which was mechanically modified to take advantage of the gain in critical current

IEEE Transactions on Applied Superconductivity, 2006

The LHC performance depends critically on the low-β  triplets, located on either side of the fou... more The LHC performance depends critically on the low-β  triplets, located on either side of the four interaction points. Each triplet consists of four superconducting quadrupole magnets, which must operate reliably at up to 215 T/m, sustain extremely high heat loads and have an excellent field quality. A collaboration of CERN, Fermilab and KEK was formed in 1996 to design and build the triplet systems, and after nine years of joint effort the production has been completed in 2005. We retrace the main events of the project and present the design features and performance of the low-β quadrupoles, built by KEK and Fermilab, as well as of other vital elements of the triplet. The tunnel installation of the first triplet and plans for commissioning in the LHC are also presented. Apart from the excellent technical results, the construction of the LHC low-β triplets has been a highly enriching experience combining harmoniously the different competences and approaches to engineering in a style reminiscent of high energy physics experiment collaborations, and rarely before achieved in construction of an accelerator.

IEEE Transactions on Appiled Superconductivity, 2005

The US-LHC Accelerator Project is responsible for the production of the Q2 optical elements of th... more The US-LHC Accelerator Project is responsible for the production of the Q2 optical elements of the final focus triplets in the LHC interaction regions. As part of this program Fermilab is in the process of manufacturing and testing cryostat assemblies (LQXB) containing two identical quadrupoles (MQXB) with a dipole corrector between them. The 5.5 m long Fermilab designed MQXB have a 70 mm aperture and operate in superfluid helium at 1.9 K with a peak field gradient of 215 T/m. This paper summarizes the test results of several production MQXB quadrupoles with emphasis on quench performance and alignment studies. Quench localization studies using quench antenna signals are also presented.

IEEE Transactions on Appiled Superconductivity, 2003

High-gradient superconducting quadrupole magnets are being developed by the US LHC Accelerator Pr... more High-gradient superconducting quadrupole magnets are being developed by the US LHC Accelerator Project for the Interaction Regions of the Large Hadron Collider. Determination of the magnetic axis for alignment of these magnets will be performed using a single stretched wire system. These measurements will be done both at room and cryogenic temperatures with very long wire lengths, up to 20m. This paper reports on the stretched wire alignment methodology to be employed and the results of recent room-temperature measurements on a 2 m model magnet with long wire lengths.

IEEE Transactions on Applied Superconductivity, 2000

Fermilab, as part of the US-LHC Accelerator Project, is producing superconducting low-beta quadru... more Fermilab, as part of the US-LHC Accelerator Project, is producing superconducting low-beta quadrupole magnets for the Large Hadron Collider (LHC). These 5.5 m long magnets are designed to operate in superfluid helium at 1.9 K with a nominal gradient of 205 T/m in the 70 mm bore. Two quadrupoles separated by a dipole orbit corrector in a single cryogenic assembly comprise the Q2 optical elements of the final focus triplets in the LHC interaction regions. The field quality of the quadrupoles is measured at room temperature during construction of the cold masses as well as during cold testing of the cryogenic assembly. We summarize data from the series measurements of the magnets and discuss various topics of interest.

IEEE Transactions on Appiled Superconductivity, 2001

Fermilab, in collaboration with LBNL and BNL, is developing a quadrupole for installation in the ... more Fermilab, in collaboration with LBNL and BNL, is developing a quadrupole for installation in the interaction region inner triplets of the LHC. This magnet is required to have an operating gradient of 215 T/m across a 70mm coil bore, and operates in superfluid helium at 1.9K. A 2m magnet program addressing mechanical, magnetic, quench protection, and thermal issues associated with the design was completed earlier this year, and production of the first full length, cryostatted prototype magnet is underway. This paper summarizes the conclusions of the 2m program, and the design and status of the first full-length prototype magnet.

A new superconducting RF cavity test facility has been commissioned at Fermilab in conjunction wi... more A new superconducting RF cavity test facility has been commissioned at Fermilab in conjunction with first tests of a 325 MHz, β = 0.22 superconducting single-spoke cavity dressed with a helium jacket and prototype tuner. The facility is described and results of full gradient, CW cavity tests with a high Q ext drive coupler are reported. Sensitivities to Q disease and externally applied magnetic fields were investigated. Results are compared to bare cavity results obtained prior to hydrogen degassing and welding into the helium jacket.

In the recently commissioned superconducting RF cavity test facility at Fermilab (SCTF), a 325 MH... more In the recently commissioned superconducting RF cavity test facility at Fermilab (SCTF), a 325 MHz, β=0.22 superconducting single-spoke resonator (SSR1) has been tested for the first time with its input power coupler. Previously, this cavity had been tested CW with a low power, high Q ext test coupler; first as a bare cavity in the Fermilab Vertical Test Stand and then fully dressed in the SCTF.

The Fermilab High Intensity Neutrino Source (HINS) Linac R&D program is building a first-of-a-kin... more The Fermilab High Intensity Neutrino Source (HINS) Linac R&D program is building a first-of-a-kind 60 MeV superconducting H-linac. The HINS Linac incorporates superconducting solenoids for transverse focusing, high power RF vector modulators for independent control of multiple cavities powered from a single klystron, and superconducting spoke-type accelerating cavities starting at 10 MeV. This will be the first application and demonstration of any of these technologies in a lowenergy, high-intensity proton/H-linear accelerator. The HINS effort is relevant to a high intensity, superconducting H-linac that might serve the next generation of neutrino physics and muon storage ring/collider experiments. An overview of the HINS program, machine design, status, and outlook is presented.

The LHC inner triplet is cooled with pressurized He II at a temperature of around 1.9 K. The tota... more The LHC inner triplet is cooled with pressurized He II at a temperature of around 1.9 K. The total heat load (beam induced heat load plus static heat load for the inner triplet) at nominal luminosity is around 180 W. The beam induced heat load distributed within the magnet coil is carried away by the static pressurized He II filling inside of the cold mass. A heat exchanger is needed to absorb the heat load within the pressurized He II to maintain the low temperature. The heat exchanger is located outside and parallel to the magnet cold mass. The saturated, two-phase He II flows inside the corrugated pipe and the static, pressurized He II surrounds the corrugated pipe. A full-sized Heat Exchanger Test Unit has been designed to simulate the LHC inner triplet cooling scheme. The test will be carried out at CERN in 2000.